Xantrex Technology Power Supply RS232 XPD User Manual

RS232-XPD

Operating Manual

Internal RS-232 Interface

for XPD Series

Programmable DC

Power Supply

Operating Manual for

Internal RS-232 Interface

for XPD 500 Watt Series

Programmable DC

Power Supply

Limited What does this warranty cover and how long does it last?

Warranty

This Limited Warranty is provided by Xantrex Technology, Inc. (“Xantrex”) and

covers defects in workmanship and materials in your RS-232 Interface Card. This

warranty lasts for a Warranty Period of 5 years from the date of purchase at point of

sale to you, the original end user customer.

What will Xantrex do?

Xantrex will, at its option, repair or replace the defective product free of charge,

provided that you notify Xantrex of the product defect within the Warranty Period,

and provided that Xantrex through inspection establishes the existence of such a

defect and that it is covered by this Limited Warranty.

Xantrex will, at its option, use new and/or reconditioned parts in performing

warranty repair and building replacement products. Xantrex reserves the right to use

parts or products of original or improved design in the repair or replacement. If

Xantrex repairs or replaces a product, its warranty continues for the remaining

portion of the original Warranty Period or 90 days from the date of the return

shipment to the customer, whichever is greater. All replaced products and all parts

removed from repaired products become the property of Xantrex.

Xantrex covers both parts and labor necessary to repair the product, and return

shipment to the customer via a Xantrex-selected non-expedited surface freight

within the contiguous United States and Canada. Alaska and Hawaii are excluded.

Contact Xantrex Customer Service for details on freight policy for return shipments

outside of the contiguous United States and Canada.

How do you get service?

If your product requires troubleshooting or warranty service, contact your merchant.

If you are unable to contact your merchant, or the merchant is unable to provide

service, contact Xantrex directly at:

Phone:

604 422 8595

Toll Free North America:

1 800 667 8422

604 421 3056

Fax:

Email:

[email protected]

Operating Manual for RS-232 for XPD Series Power Supply

Direct returns may be performed according to the Xantrex Return Material

Authorization Policy described in your product manual. For some products, Xantrex

maintains a network of regional Authorized Service Centers. Call Xantrex or check

our website to see if your product can be repaired at one of these facilities.

In any warranty claim, dated proof of purchase must accompany the product and the

product must not have been disassembled or modified without prior written

authorization by Xantrex.

Proof of purchase may be in any one of the following forms:

•

The dated purchase receipt from the original purchase of the product at point of

sale to the end user, or

The dated dealer invoice or purchase receipt showing original equipment

manufacturer (OEM) status, or

The dated invoice or purchase receipt showing the product exchanged under

warranty

What does this warranty not cover?

This Limited Warranty does not cover normal wear and tear of the product or costs

related to the removal, installation, or troubleshooting of the customer’s electrical

systems. This warranty does not apply to and Xantrex will not be responsible for any

defect in or damage to:

a. the product if it has been misused, neglected, improperly installed, physically

damaged or altered, either internally or externally, or damaged from improper

use or use in an unsuitable environment;

b. the product if it has been subjected to fire, water, generalized corrosion,

biological infestations, and high input voltage from lightning strikes;

c. the product if repairs have been done to it other than by Xantrex or its authorized

service centers (hereafter “ASCs”);

d. the product if it is used as a component part of a product expressly warranted by

another manufacturer;

e. the product if its original identification (trade-mark, serial number) markings

have been defaced, altered, or removed.

Release 1.2

iii

Disclaimer Product

THIS LIMITED WARRANTY IS THE SOLE AND EXCLUSIVE WARRANTY PROVIDED

BY XANTREX IN CONNECTION WITH YOUR XANTREX PRODUCT AND IS, WHERE

PERMITTED BY LAW, IN LIEU OF ALL OTHER WARRANTIES, CONDITIONS,

GUARANTEES, REPRESENTATIONS, OBLIGATIONS AND LIABILITIES, EXPRESS

OR IMPLIED, STATUTORY OR OTHERWISE IN CONNECTION WITH THE PRODUCT,

HOWEVER ARISING (WHETHER BY CONTRACT, TORT, NEGLIGENCE, PRINCIPLES

OF MANUFACTURER’S LIABILITY, OPERATION OF LAW, CONDUCT, STATEMENT

OR OTHERWISE), INCLUDING WITHOUT RESTRICTION ANY IMPLIED WARRANTY

OR CONDITION OF QUALITY, MERCHANTABILITY OR FITNESS FOR A

PARTICULAR PURPOSE. ANY IMPLIED WARRANTY OF MERCHANTABILITY OR

FITNESS FOR A PARTICULAR PURPOSE TO THE EXTENT REQUIRED UNDER

APPLICABLE LAW TO APPLY TO THE PRODUCT SHALL BE LIMITED IN DURATION

TO THE PERIOD STIPULATED UNDER THIS LIMITED WARRANTY.

IN NO EVENT WILL XANTREX BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT,

INCIDENTAL OR CONSEQUENTIAL DAMAGES, LOSSES, COSTS OR EXPENSES

HOWEVER ARISING WHETHER IN CONTRACT OR TORT INCLUDING WITHOUT

RESTRICTION ANY ECONOMIC LOSSES OF ANY KIND, ANY LOSS OR DAMAGE TO

PROPERTY, ANY PERSONAL INJURY, ANY DAMAGE OR INJURY ARISING FROM OR

AS A RESULT OF MISUSE OR ABUSE, OR THE INCORRECT INSTALLATION,

INTEGRATION OR OPERATION OF THE PRODUCT.

Exclusions If this product is a consumer product, federal law does not allow an exclusion of

implied warranties. To the extent you are entitled to implied warranties under federal

law, to the extent permitted by applicable law they are limited to the duration of this

Limited Warranty. Some states and provinces do not allow limitations or exclusions

on implied warranties or on the duration of an implied warranty or on the limitation

or exclusion of incidental or consequential damages, so the above limitation(s) or

exclusion(s) may not apply to you. This Limited Warranty gives you specific legal

rights. You may have other rights which may vary from state to state or province to

province.

Operating Manual for RS-232 for XPD Series Power Supply

Information WITHOUT LIMITING THE GENERALITY OF THE FOREGOING, UNLESS

SPECIFICALLY AGREED TO BY IT IN WRITING, XANTREX

a. MAKES NO WARRANTY AS TO THE ACCURACY, SUFFICIENCY OR SUITABILITY

OF ANY TECHNICAL OR OTHER INFORMATION PROVIDED IN MANUALS OR

OTHER DOCUMENTATION PROVIDED BY IT IN CONNECTION WITH THE

PRODUCT; AND

b. ASSUMES NO RESPONSIBILITY OR LIABILITY FOR LOSSES, DAMAGES,

COSTS OR EXPENSES, WHETHER SPECIAL, DIRECT, INDIRECT,

CONSEQUENTIAL OR INCIDENTAL, WHICH MIGHT ARISE OUT OF THE USE OF

SUCH INFORMATION.

THE USE OF ANY SUCH INFORMATION WILL BE ENTIRELY AT THE USER’S RISK.

WARNING: Please refer to your product user manual for limitations on uses of the product.

Specifically, please note that this power supply is not intended for use in connection

with life support systems and Xantrex makes no warranty or representation in

connection with any use of the product for such purposes.

Limitations

on Use

Xantrex Technology, Inc.

8999 Nelson Way

Burnaby, British Columbia

Canada V5A 4B5

Information Please record the following information when you first open your Power Supply

package:

About Your

Power

Model Number

Serial Number

Purchased From

Purchase Date

______________________________________________

Supply

Release Release 1.2 (2002-06)

Printed in Canada

Release 1.2

Power

Supply

Safety

WARNING—High Energy and High Voltage

Exercise caution when using and calibrating a power supply. High energy levels

can be stored at the output voltage terminals on a power supply in normal

operation. In addition, potentially lethal voltages exist in the power circuit and on

the output and sense connectors of a power supply with a rated output greater

than 40 V. Filter capacitors store potentially dangerous energy for some time after

power is removed.

CAUTION

Operate the power supply in an environment free of flammable gases or fumes.

To ensure that the power supply’s safety features are not compromised, use the

power supply as specified in this manual and do not substitute parts or make any

unauthorized modifications. Contact the service technician for service and repair

help. Repairs must be made by experienced service technicians only.

Warnings, Warnings, cautions, and notes are defined and formatted in this manual as shown

below.

Cautions,

and Notes

WARNING

Describes a potential hazard which could result in injury or death, or, a procedure

which, if not performed correctly, could result in injury or death.

CAUTION

Describes a procedure which, if not performed correctly, could result in damage

to data, equipment, or systems.

Note

Describes additional operating information which may affect the performance of the

equipment.

Operating Manual for RS-232 for XPD Series Power Supply

About This Manual

This technical manual is for the RS-232 Interface; a microprocessor-controlled

option card for all models of XPD Series DC output power supplies. This manual

provides you with specifications, user options, and configuration instructions for the

interface, along with a command set which allows you to control your power supply

from a computer console. Error messages and calibration procedures are also

included.

This manual is designed for the user who is familiar with basic electrical theory

especially as it applies to the operation of power supplies. This implies a recognition

of Constant Voltage and Constant Current operation modes and the control of input

and output power, as well as the observance of safe techniques while effecting supply

or pin connections and any changes in switch settings. The user should also have

experience with a computer-based communications software package.

Refer to your power supply manual for installation, configuration, and operating

procedures for your power supply.

Main Sections

Section 1 Features and Specifications Describes the interface and lists its

features and specifications.

Section 2 Installation and Configuration Goes through basic setup

procedures. Describes inspection, cleaning, shipping, and storage procedures.

Section 3 Operation Lists the complete command set, status registers, and error

codes.

Section 4 Calibration Provides detailed procedures for voltage and current

mode calibration as well as over voltage protection (OVP) calibration. Includes

calibration for programming and readback accuracy.

Manual Revisions

The current release of this manual is listed below. Updates may be issued as an

addendum.

Release 1.2 (2002/06)

Release 1.2

vii

About This Manual

viii

Operating Manual for RS-232 for XPD Series Power Supply

Contents

About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii

Section 1. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Features and

Specifications

Features and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Feature s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2

Programmable Function s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2

Readback Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Section 2. Introductio n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 5

Installation

and

Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Basic Setup Procedur e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 9

Configuration

Communication s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 0

Baud Rate Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Flow Control Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Software Flow Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Hardware Flow Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Connection s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2

Transmit / Receive Pin Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Remote/Local Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Remote / Local Mode Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Remote Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Local Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Remote Enable (REM) Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

RS-232 Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Power Supply Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

User Options and Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

OVP Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

TTL Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

User Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Connector J21 User Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

J21 Cable Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Section 3. Introductio n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3

Operation

RS-232 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Command Syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Manual Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Command Format and Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Command Strings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Command Terminators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Command Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Command Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Release 1.2

Contents

Accumulated Status, Status, and Fault Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Diagnostic LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Section 4. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Calibration

Voltage Mode Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Voltage Calibration Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Voltage Program Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Voltage Readback Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Current Mode Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Current Calibration Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Current Program Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Current Readback Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Over Voltage Protection (OVP) Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Operating Manual for RS-232 for XPD Series Power Supply

Section 1. Features and Specifications

Description

The RS-232 Interface is a microprocessor-controlled option card for all models of

the XPD Series of DC output power supply. Installed internally, the RS-232 interface

card gives you remote digital control of simple test systems. It features fast, 16-bit

resolution for programming and readback and uses bit serial protocol for sending

data between the computer and the interface. The RS-232 interface has an extensive

command set and uses most of the user-programmable features employed by all of

our interfaces.

In addition to the RS-232 port and its interface, this remote control application

requires a computer-based communications software package such as PROCOMM,

XTALK, Windows Terminal Program, equivalent communications software, or low

level or high level language programs. The RS-232 interface is an ideal tool for

reliable, remote power supply control of both research and development

applications.

Figure 1.1 Sample Configuration using RS232 Interface

Release 1.2

Features and Specifications

Features and Functions

Features • 16-bit programming and readback of voltage and current

•

Programmable soft limits for voltage and current

Programmable over voltage protection with reset

Easy-to-use, self-documenting command set

Standardized commands for complete communication with any of the supplies

in the system

•

User-programmable isolated fault, polarity, isolation, and auxiliary, user-defined

output signals.

LED status signals: error, address, remote/local operation, and over voltage

protection.

•

Foldback in CV or CC mode with reset

Software calibration

Programmable • Output voltage and current

Functions

•

Soft limits for voltage and current

Over voltage protection

Output enable/disable

Maskable fault interrupt

Hold and trigger

Output relay signals

Readback • Actual voltage and current

Functions

•

Voltage and current settings

Soft voltage and current limits

Over voltage protection setting

Present and accumulated power supply status

Programming error codes

Fault codes

Power supply model and software version identification

Operating Manual for RS-232 for XPD Series Power Supply

Features and Specifications

Specifications

The specifications in this section are warranted at 25°C ±5°C unless otherwise

specified. All specifications are subject to change without notice.

Table 1.1 Specifications for XPD 500 W Series Supply with RS-232 Interface Installed.

Models

7.5-67

18-30

33-16

60-9

120-4.5

Program Resolution

Voltage

Current

1.2mV

5.2mA

1.2mV

4.6mV

3.6mA

4.6mV

5.1mV

2.9mA

5.1mV

9.3mV

1.3mA

9.3mV

18.6mV

0.7mA

18.6mV

OVP

Program Accuracy¹

Voltage

10mV

75mV

150mV

±0.3%

80mA

±0.15%

600mV

180mV

±0.25%

80mA

±0.1%

1.2V

±0.12%

250mA

±0.1%

80mV

±0.12%

140mA

±0.1%

200mV

±0.12%

115mA

±0.15%

330mV

Current

OVP

Readback Resolution

Voltage

Current

1.2mV

5.2mA

4.6mV

3.6mA

5.1mV

2.4mA

9.3mV

1.3mA

18.6mV

0.7mA

Readback Accuracy¹

Voltage

30mV

75mV

150mV

±0.3%

80mA

180mV

±0.25%

80mA

±0.12%

250mA

±0.1%

±0.12%

140mA

±0.1%

±0.2%

115mA

±0.15%

Current

±0.15%

±0.1%

1. Apply accuracy specifications according to the following voltage program accuracy example:

Set a model XPD 18-30 power supply to 10 volts.

The expected result will be within the range of 10 volts ± 75mV ± 0.12% of the set voltage of 10 volts.

Release 1.2

Features and Specifications

Specifications

Operating Manual for RS-232 for XPD Series Power Supply

Section 2. Installation and Configuration

Introduction

To use this product, you must have the following equipment:

•

a compatible model of DC output power supply

serial extender cable (straight through)

computer with an RS-232 interface (serial port)

computer-based communications software package

The RS-232 interface is usuall y installed at the factory . Y o ur local distributor or

service center can also install the interface, especially for use in a

previously-purchased supply already on site. You must then configure the RS-232

Interface-enhanced supply for your system using the “Basic Setup Procedure” on

page 19. Refer also to Figure 2.1, on page 16, Figure 2.2, on page 17 and Figure 2.3,

on page 18 for drawings of the front panel, the interface subplate, and the RS-232

interface printed circuit board (PCB).

Initial Inspection

CAUTION

If you remove the unit's cover, use proper static control techniques to avoid damage

to static-sensitive components on the printed circuit board.

On first receiving your unit, perform a quick physical check.

•

Ensure each package contains a power supply with its RS-232 interface board

installed, and manuals for the power supply and the RS-232 interface. Any

additional parts shipped with the power supply will be identified in the supply's

documentation.

•

Inspect the unit for any signs of physical damage such as scratches, cracks, or

broken switches, connectors, or displays.

Check the printed circuit board and components if you suspect internal damage.

If the unit is damaged, save all packing materials and notify the carrier immediately.

For additional information, please see the section titled, “Returning Power Supplies

to the Manufacturer” in the manual shipped with your complete unit.

Release 1.2

Installation and Configuration

Initial Inspection

CAUTION

Use proper static control techniques to avoid damage to static-sensitive components

on the printed circuit board.

Service Request LED (SRQ)

Only used for GPIB option

Remote LED (REM)

Figure 2.1Power Supply Front Panel with RS-232 Interface Installed

Operating Manual for RS-232 for XPD Series Power Supply

Installation and Configuration

Initial Inspection

S1 Switch

Address LED (ADR)

Indicates that the unit is

being addressed by the

master controller.

1 Remote/Local Startup

2 Power On Service Request

(Enable/Disable)

3 Not Used

4-8 Primary Address

Selection (A1-A5)

Error LED (ERR)

Indicates that a programming

error has occurred. Clear with

error query command.

Switch Position

Reference markings

(0) (1)

IEEE 488 Connector

J21 User Signal

Connector

Figure 2.2 RS-232 Interface Subplate

(Located on Power Supply Rear Panel)

CAUTION

Use proper static control techniques to avoid damage to static-sensitive components

on the printed circuit board

Release 1.2

Installation and Configuration

Initial Inspection

JUMPER SELECTION

Local OVP control selection

[closed] [default]. See page 28.

[open] Front Panel OVP Control.

User TTL shutdown (S/D)

selection

[1-2] User TTL S/D line active low. See page 31.

[2-3] [default] User TTL S/D line active high.

J20

J10

Remote OVP Control Selection

[closed] [default]. See page 28.

[open]

RS-232 (J4) transmit and

receive pin selection

[3-1] Receive on pin 3 [default]

[4-6] Transmit on pin 2 [default]

[3-5] Receive on pin 2

[4-2] Transmit on pin 3

J16

J17

RS-232 flow control selection of

RTS/CTS (ready to send/clear

to send) or DTR/DSR (data

terminal ready/data set ready)

[1-3][4-6] [default] RTS input on pin 7 (used with

CTS output on pin 8)

[3-5][4-6] DTR input on pin 4 (used with DSR

output on pin 6)

RS-232 flow control selection of

RTS/CTS or DTR/DSR

[2-4][[3-5] [default] CTS output on pin 8 (used

with RTS input on pin 7)

[2-4][1-3] DSR output on pin 6 (used with DTR

input on pin 4)

Note: All other jumpers are not user-selectable.

LED INDICATORS

Red Diagnostic LED

Green Diagnostic LED

Bus error or soft restart on Slave circuitry.

Soft restart on Master circuitry.

Bus error on Master circuitry.

EPROMS

U18

Slave EPROM

Master EPROM

See revision number stamped on EPROM.

Figure 2.3 RS-232 Interface PCB

Operating Manual for RS-232 for XPD Series Power Supply

Installation and Configuration

Basic Setup Procedure

This procedure can be used as a quick reference for those familiar with the

configuration requirements for the RS-232 interface as installed in the DC power

supply. For those who want more information, each step refers to more detailed

procedures located in subsequent sections. Execute each step of the procedure in the

sequence given.

Table 2.1 Setup Procedure

Step # Description

Action

Reference

Baud Rate

Selection

Select transmission speed

See “Baud Rate Selection” on

page 20.

Flow Control

Selection

Set flow control ON or OFF. If flow

control is set ON, choose

“Flow Control Selection” on page

20.

software-based XON/XOFF or

hardware-based CTS/RTS (Clear to

Send/Ready to Send) or DTR/DSR

(Data Terminal Ready/Data Set Ready)

communication control.

Remote/Local

Operation

Use the rear panel PON REM switch to See “Remote/Local Operation” on

select remote or local startup of the

power supply.

page 23.

RS-232

Connection

Connect the RS-232 cable assembly to See “RS-232 Connection” on

the supply at connector J4.

page 26

User Signal

Connector

Configure and use the J21 connector

signals, if required.

See “Connector J21 User Signals”

on page 30.

Power ON

Power on the unit. Before proceeding,

check to ensure that the green REMOTE on page 28 and “User Signals” on

LED on the front panel is on.

See “User Options and Settings”

page 30 for information about

Local/Remote OV P, TTL Shutdown,

and auxiliary connector J21 user

signals.

Power Supply

Settings

Configure the controller’s operating

parameters to match the power supply

settings.

See “Power Supply Settings” on

page 27.

Test

Test the link by communicating with the Example: VSET2;ISET1

power supply. This command string sets power

supply voltage to 2V and its current

limit to 1A.

See Section 3.

Release 1.2

Installation and Configuration

Communications

Baud Rate Serial transmission sends and receives data in bit streams at fixed bit rates. Both the

computer and the interface must have the same bit rate setting for proper

communication. Use switches B1, B2, and B3 on the rear panel S1 switch to select

the power supply's rate of transmission in bits per second. Table 2.2, “Switch S1

Settings for Baud Rate”summarizes the switch settings with the reference markings

on the rear panel subplate. Refer to Figure 2.2, on page 17 for the location of the S1

switch on the RS-232 interface subplate.

Selection

Table 2.2 Switch S1 Settings for Baud Rate

Baud Rate

9600

4800

2400

1200

600

300

150

0 = OPEN/OFF

1 = CLOSED/ON

Note:When resetting switches B3, B2, and B1 during a working session, turn the

power supply OFF and then ON again to ensure that the new settings are put into

effect.

Flow Control Flow control signals regulate data flow for proper communication. Use the FLOW

switch on the rear panel S1 switch to select flow control or to disable flow control.

With flow control enabled, you can use either software or hardware protocols to

control flow rates. Table 2.3 gives the FLOW switch settings with regards to the

markings on the subplate rear panel. For a diagram of the rear panel subplate, see

Figure 2.2, on page 17.

Selection

Table 2.3 Flow Control Section

FLOW Switch Setting

Condition

Disable Flow Control

Enable Flow Control

Operating Manual for RS-232 for XPD Series Power Supply

Installation and Configuration

Communications

Once flow control is selected as option, two flow control methods are available. You

can use the rear panel XON switch to select either software-based XON/XOFF flow

protocol or hardware-based CTS/RTS or DTR/DSR flow protocol. Table 2.4 shows

the flow control conditions with regards to the markings on the rear panel subplate.

For a diagram of the rear panel subplate, see Figure 2.2, on page 17.

Table 2.4 Hardware/Software Flow Control Selection

XON Switch Setting

Condition

Hardware Flow Control

(CTS/RTS or DTR/DSR protocol)

Software Flow Control

(XON/XOFF protocol)

Software This software protocol uses special characters that synchronize device

communications. The device sends the control code XOFF (ASCII value 13 hex)

when it is not ready to receive data. The device sends the control code XON (ASCII

value 11) when it is ready to resume receiving data.

Flow Control

To choose XON/XOFF protocol, select the XON switch position shown in

Table 2.4.

Hardware Hardware flow control protocol requires a dedicated control line on the RS-232

cable. The dedicated control line is needed so that the device can signal the controller

when it is ready to receive data. You can designate either RTS/CTS or DTR/DSR

protocol for the RS-232 interface.

Flow Control

Set the XON switch for hardware control using the information in Table 2.4. With

hardware flow control selected, RS-232 Interface PCB jumpers J16 and J17 dictate

the type of flow protocol. Table 2.5, “Jumper/Pin Settings for RTS/CTS Flow

Control (Default)” and Table 2.6, “Jumper/Pin Settings for DTR/DSR Flow Control

(Default)” identify jumper connections and input and output pin designations for

each protocol. See also “Transmit / Receive Pin Selection” on page 22 for RS-232

connector pinouts.

Note:When resetting the flow control switches during a working session, turn the

power supply OFF and then ON again to ensure that the new settings are put into

effect.

Table 2.5 Jumper/Pin Settings for RTS/CTS Flow Control (Default)

Jumper Connections

J17 to 2-4 and 3-5

J16 to 1-3 and 4-6

RS-232 Connector Pin

RTS (Input to RS-232)

CTS (Output to RS-232)

Release 1.2

Installation and Configuration

Communications

Table 2.6 Jumper/Pin Settings for DTR/DSR Flow Control (Default)

Jumper Connections

J17 to 2-4 and 1-3

J16 to 3-5 and 4-6

RS-232 Connector Pin

DTR (Input to RS-232)

DSR (Output to RS-232)

Connections

Use a 9-pin (DB9) to 9-pin parallel cable to connect the interface card to the

serial port on the host computer. If you need to use a 25-pin connector (DB25)

on the host interface, ensure the correct connections are made by referring

Table 2.7. If the proper cables are not available and you need to change the

transmit/receive pin configuration, see “Transmit / Receive Pin Selection”.

Table 2.7 Transmit/Receive Pin Connections

Power Supply (DCE)

Host Computer (DTE)

9-pin connector

Pin 2 (Receive)

Pin 3 (Transmit)

Pin 5 (Ground)

Pin 2

transmits to

receives from

connects to

Pin 3

Pin 5 (Ground)

25-pin connector

Pin 3 (Receive)

Pin 2 (Transmit)

Pin 7 (Ground)

Pin 2

transmits to

receives from

connects to

Pin 3

Pin 5 (Ground)

Transmit /

Receive Pin

Selection

The RS-232 interface can use either pin 2 or pin 3 of the RS-232 connector to

transmit or receive data. Y o u can set the pin orientation you want by changing

the position of the J10 jumper on the interface PCB. Table 2.8, “Jumper Settings

for Transmit/Receive Pin Selection” shows the transmit/receive pin selection on

the RS-232 connector in relation to the settings of the J10 jumper. See

Figure 2.3, “RS-232 Interface PCB” on page 18 to locate jumper J10.

Table 2.8 Jumper Settings for Transmit/Receive Pin Selection

Jumper J10 Connections

RS-232 Connector Pin

Transmit (TXD)

Receive (RXD)

4-6 (default)

4-2

3-1 (default)

3-5

Operating Manual for RS-232 for XPD Series Power Supply

Installation and Configuration

Remote/Local Operation

Remote /

Local Mode

Startup

Start the power supply either in local mode or in remote mode by setting the power

ON remote (PON REM) switch which is located on the unit’s rear panel. See

Table 2.9 for the switch settings.

Table 2.9 Remote/Local Start-up Settings.

Switch Position

Power ON results

Unit in remote mode

Unit in local mode

With the rear panel PON REM switch set to 0, the power supply will start up in

remote mode. The green REM LED on the front panel will turn on, signaling that

the power supply is under the control of the digital interface card. The output of the

power supply is active on startup. To promote load safety, power ON defaults are

zero for the output voltage and current limit, and 110% of maximum output voltage

for the OVP trip point. See Table 2.10. Refer to Section 3 for more information

about the interface commands listed in the table.

If the rear panel PON REM switch is set to 1, the power supply will power up in

local mode. Power supply control is at the front panel. During an operating session,

you can toggle between local mode and remote mode by sending commands as

described in Table 2.10.

Release 1.2

Installation and Configuration

Remote/Local Operation

Table 2.10 Remote Mode Power On Conditions

Condition

Voltage

Default Settings

7.5-140 Model Example

VSET 0

0 V

Current

0 A

ISET 0

Soft Voltage Limit

Soft Current Limit

OVP Trip Voltage

Delay

VMAX (see models)

VMAX 7.5

IMAX (see models)

IMAX 140

Model VMAX + 10%

OVSET 8.25

DLY 0.5S

0.5 s

Remote Enable

Foldback Protection

Output

REM ON

OFF

FOLD OFF

OUT ON

Hold

OFF

NONE

OFF

HOLD OFF

UNMASK NONE

AUXA OFF

AUXB OFF

Unmask

AUXA

AUXB

Remote Mode

Operation

While in remote mode, use the interface commands to control the output of the

power supply from a computer. See Section 3 for a complete list of

device-dependent commands available with this interface.

From remote mode, change to local mode operation by sending either the GTL (Go

to Local) command or the REM (Remote Enable) OFF command.

To return to remote mode, ensure that the REM command is set to ON and then

send any valid device-dependent command.

Local Mode

Operation

In local mode operation, you set the voltage and current output levels and the OVP

trip level with controls located on the front panel. Refer to the operating manual for

a description of the functions available at the front panel.

While in local mode operation, you can change power supply control to remote

mode by ensuring that REM is ON, then sending any software command and OUT

ON to restore the output. Return to local mode by using the GTL command to send

Operating Manual for RS-232 for XPD Series Power Supply

Installation and Configuration

Remote/Local Operation

the power supply into local mode, or use the REM OFF command to turn off LLO

and return the power supply to local mode. When you toggle to remote mode from

local mode, the power supply has the same conditions are were last set.

Remote

Enable (REM)

Command

You can use the Remote Enable command to toggle between local mode and

remote mode. The default setting at startup is REM ON. With the remote enable

command set at REM ON, you can return the power supply to remote mode

whenever you send any command from the computer. Any time that you change

from local to remote mode during a session, the output is programmed to turn off,

since the remote mode settings may be different from the local mode settings. Send

the OUT ON command to restore the output.

You can turn off Remote Enable and move power supply control to the front panel

by sending the REM OFF command.To check whether the power supply is remote

enabled, use the REM? query command.

Example:

REM ON

Enable the power supply to be sent into

remote mode

VSET 10;ISET 2

Put the unit into remote operation mode

(Use any command to do this.)

Release 1.2

Installation and Configuration

RS-232 Connection

WARNING

Do not operate the power supply and the computer at significantly different frame

potentials. The interface connection system may not be capable of handling the

resulting excessive ground currents.

Use an approved RS-232 connector and cable when connecting the RS-232

Interface to your computer. The RS-232 connector uses the 9 pin mating connector

J4 on the rear panel. Figure 2.4 shows the connector pinouts for the RS-232

connector. Refer to Figure 2.2, on page 17 for the position of the RS-232 connector

on the rear panel subplate.

Figure 2.4 RS-232 Connector (J4) Pinouts (default configuration)

Operating Manual for RS-232 for XPD Series Power Supply

Installation and Configuration

Power Supply Settings

For serial communication, the computer and the RS-232 interface must share the

same communication settings. Make sure that the settings of the computer and of

the power supply agree with those shown in Table 2.11.

Table 2.11 Power Supply Settings

Parameter

Transmission

Mode

Setting

Asynchronous

Full Duplex

Speeds

75, 150, 300, 600, 1200, 2400, 4800, 9600

Parity

None

Connector

Start Bit

DB9-pin Male

Stop Bit

Data Bits

Protocols

XON/XOFF

CTS/RTS (DSR/DTR)

NONE

Release 1.2

Installation and Configuration

User Options and Settings

CAUTION

If you remove the unit's cover, use proper static control techniques to avoid damage

to static-sensitive components on the printed circuit board.

You can customize remote operation settings for OVP (over voltage protection)

control and TTL shutdown by changing jumper positions on the RS-232 PCB.

Refer to the operating manual for information on how to use over voltage

protection and TTL shutdown.

OVP

Selection

Over voltage protection (OVP) on the RS-232 interface is set at the factory for

remote software operation. When operating the power supply in remote mode, you

control the OVP trip level using the OVSET software command. If you return the

power supply to local operation by using the REM software command, control of

the OVP trip level changes from software control to the front panel OVP

potentiometer. The default OVP trip level is set as 110% of the power supply's

rated output voltage. See Table 2.10, on page 24 for a complete list of remote

power ON default settings.

You can isolate the location of OVP control by changing the positions of the Local

OVP Control jumper J2 and the Remote OVP Control jumper J20, both on the

RS-232 interface PCB. The default jumper settings allow control of OVP to depend

on the operating state of the power supply. By physically changing the jumper

settings, you can isolate the location of OVP control to software control only or

front panel control only. Table 2.12, “OVP Control Mode Selection” shows a table

of jumper settings and OVP programming selection. Refer to “Basic Setup

Procedure” on page 19 for the positions of the jumpers on the RS-232 PCB.

Table 2.12 OVP Control Mode Selection

PCB Jumper J2 PCB Jumper

Position J20 Position

OVP Programming Selection

Closed (default) Closed (default) Software or Front Panel OVP control

(dependent on the power supply operating state)

Closed

Open

Closed

Open

Software OVP control only

Front Panel OVP control only

Operating Manual for RS-232 for XPD Series Power Supply

Installation and Configuration

User Options and Settings

TTL

Shutdown

You can use the Shutdown function to disable or enable the supply's output.

Disabling the supply using TTL shutdown allows you to make adjustments to the

load or to the power supply without shutting down the power supply. With the

RS-232 interface installed, TTL shutdown is activated by a TTL signal to Pin 1 of

the J21 connector on the interface subplate. The shutdown user line uses a 0-5Vdc

TTL input with a high signal range of 2.2-5.0Vdc. The current range of the

shutdown line is 1-10mA. See Figure 2.6, “J21 User Signal Connector Circuit

Block Diagram” on page 31 for a schematic of the J21 connector containing the

shutdown user line.

You can select the logic level of the TTL input by changing the J3 connector on the

RS-232 PCB. Table 2.13 shows the TTL signal levels for the J3 jumper settings.

See Figure 2.2-3 for the location of the J3 jumper on the printed circuit board.

Table 2.13 Switch Settings for TTL Shutdown Circuit Logic

PCB Jumper J3 Position

TTL Signal Level Supply Output Condition

Pin 2 to Pin 3 (default)

HIGH

LOW

OFF

Pin 1 to Pin 2

HIGH

LOW

OFF

Release 1.2

Installation and Configuration

User Signals

Connector

J21 User

Signals

Auxiliary connector J21, located on the RS-232 interface rear panel, provides

several signals to increase your operating control of the supply. These signals are

dependent on the operator's design and uses. The operation of the J21 signal

requires that you provide external Vcc and ground. Use a standard 8-position

telephone jack and data cable to connect to J21. To locate the connector, refer to

the RS-232 interface subplate drawing in Figure 2.2, on page 21. See Figure 2.5 for

pin descriptions. The J21 outputs can sink a current of 5mA each. Figure 2.6, on

page 31 shows the portion of the option board schematic which contains the J21

connector. Use the schematic as a reference when making input or output

connections.

J21-1 External TTL shutdown input signal

(See “TTL Shutdown”)

J21-2 Polarity signal, open collector

(asserted by VSET -x)

J21-3 Isolation signal, open collector

(asserted by OUT OFF)

J21-4 Fault signal, open collector

J21

(asserted when bit set in fault register)

J21-5 External Vcc, 15V maximum

(supplied by connecting and operating an external source)

J21-6 External ground and shutdown return

(supplied by connecting and operating an external source)

J21-7 Open collector user signal

(asserted by AUXA ON)

J21-8 Open collector user signal

(asserted by AUXB ON)

Figure 2.5 User Signals J21 Connector

Operating Manual for RS-232 for XPD Series Power Supply

Installation and Configuration

User Signals

Figure 2.6 J21 User Signal Connector Circuit Block Diagram

J21 Cable

Connection

Use a standard 8-position telephone jack and data cable to connect to J21. Add a

ferrite block to reduce radiated emission. The one inch square ferrite block with

built-in housing clip is packaged and shipped with the power supply interface card.

To install the ferrite block:

1. Position the block no more than 5 cm (2") from the power supply end of the

J21 user cable.

2. Open the ferrite block housing.

3. Loop the cable through the ferrite block. See Figure 2.7, “J21 User Cable with

Ferrite Block” on page 32.

4. Close the housing clip.

The ferrite block ensures that the power supply system meets radiated emission

requirement 89/336/EEC for CE mark approval. See the power supply's operating

manual for noise specifications.

Release 1.2

Installation and Configuration

User Signals

J21 User Cable

Ferrite Block

To J21 Connector

To User Custom Interface

Figure 2.7 J21 User Cable with Ferrite Block

Operating Manual for RS-232 for XPD Series Power Supply

Section 3. Operation

Introduction

This section covers RS-232 interface programming, including an extensive set of

device-dependent commands, and providing error codes, and status and fault register

information.

RS-232 Operation

The RS-232 interface card lets you send and receive data between your power supply

and computer, relying on bit serial communication. You can use the computer

controller to issue commands to the power supply for programming, queries,

calibration, or status. The power supply responds to the complete command set of

device dependent software commands shown in “Command Reference” on page 40.

Command Syntax

Manual The manual uses these conventions when displaying command information. These

characters are not part of the command but are used to denote parameters used with

the command.

Conventions

< > (angle brackets)

Angle brackets enclose a parameter. Do not include

the angle brackets in the command line you send to

the computer.

/ (slash)

Separates two alternative parameters. When a slash

separates two parameters, you can use either

parameter to achieve the same result.

Example: <1/ON>

Entering 1 or ON will achieve the same result.

COMPUTER ENTRY

Words typed on the computer are shown in Arial

text, full capitals.

Release 1.2

Operation

Command Syntax

Command The device-dependent language for the RS-232 Interface consists of commands and

parameters. A command is a one word code which either gives instructions to the

interface or asks for information from the interface. A command may be followed by

one or more parameters, a short code that changes the state of the power supply or

the state of the bit register. Table 3.1, “Command Parameters” lists the parameters

that affect the command set.

Format and

Parameters

Format:

COMMAND or

COMMAND <parameter> or

COMMAND <parameter>,<parameter>

•

You can enter commands in upper or lower case lettering.

Example: MASK FOLD = mask fold

Do not further abbreviate command names or parameters.

Example:

MASK FOLD ≠ MK FOLD

MASK FOLD ≠ MASK FD

•

Use a space between the command and the first parameter. Any number of

consecutive spaces is treated as one space. Numeric data may contain leading

spaces. Embedded spaces between digits or between a digit and a decimal point

are not accepted.

Example:

MASK FOLD = MASK

VOUT 3.4 = VOUT

FOLD

3.4

VOUT 3.4 ≠ VOUT 3.

•

Use commas between parameters in those commands with more than one

parameter, and between mnemonic parameters as in the MASK and UNMASK

commands. Only one comma is allowed and it may be preceded or followed by

any number of spaces.

Example:

MASK CV, OV, FOLD

Operating Manual for RS-232 for XPD Series Power Supply

Operation

Command Syntax

Table 3.1 Command Parameters

Parameter

Description

Form

The current in amps or milliamps. If no unit is <float>

given, the default unit is amps.

<float>A

<float>mA

<time>

The time in seconds or milliseconds. If no unit <float>

is given, the default unit is seconds.

<float>s

<float>ms

<voltage>, <Vlo>, <Vhi> The voltage in volts or millivolts. If no unit is

given, the default unit is volts.

<float>

<float>V

<float>mV

A combination of CV, CC, CV, OV, OT, SD,

FOLD, ERR, PON, REM, ACF, OPF, and

SNSP. See MASK and UNMASK commands

in the command reference for use of the ALL

and NONE parameters.

See registers

on page 47.

<state>

The state of a binary condition.

<1/ON,

0/OFF>

Floating Point Number <float> Variables sent with command parameters are

floating point numbers. Table 3.2 defines the structure of floating point numbers for

use with the software commands.

Table 3.2 Floating Point Numbers

Floating Number Definition

Example

The floating point number has four significant figures.

It can be of either sign, positive or negative.

1.234

-1.234

+1.234

A floating point number can have one decimal point.

0.123

1.2

123.4

Scientific Notation

123.0E-1

Use E or e after the number for a base ten exponent. 1.2E-1

An integer of either sign must follow an exponent.

10.00E+1

Command If you send more than one command line, separate the commands with a semicolon.

The semicolon may be preceded or followed by spaces.

Strings

Example:

ISET 2.0A; VSET 5V

Release 1.2

Operation

Command Syntax

Command Terminators indicate the end of a command string and tell the power supply to

execute the command. The termination character is LF (Line Feed).

Terminators

Format:

COMMAND <parameter>; COMMAND <parameter>, <parameter><LF>

Most computer controllers automatically send LF with output statements.

Order You may send commands in any order, keeping in mind that only those commands

received after a HOLD and before a TRG (trigger) will be released by the TRG

command. In addition, only these commands received after a supply disable and

before a RST (reset) or OUT ON command will be released by the RST command

or the OUT command. Commands are executed in the order they are received.

Operating Manual for RS-232 for XPD Series Power Supply

Operation

Command Summary

Use these commands to control the operation of the supply. They are listed here in

order of function such as PROGRAMMING, QUERY, CALIBRATION, and

STATUS commands. See “Command Reference” on page 40 for more detailed

information about each command and its use.

Table 3.3 Programming Commands

Command Description

AUXA

AUXB

CLR

Selects the state of the AUXA output signal on the J21-7 connector.

Selects the state of the AUXB output signal on the J21-8 connector.

Initializes the power supply to its Power ON (PON) state.

DLY

Sets a programmable time delay which is executed by the supply

before reporting fault conditions after a new output voltage or current is

specified.

GTL

Sends the supply to local mode.

FOLD

HOLD

IMAX

Sets foldback mode for the supply.

Enables or disables voltage/current setting hold mode for the supply.

Sets an upper soft limit on the programmed output current for the

supply.

ISET

LLO

Sets the output current of the supply in amps (default) or in milliamps.

Local Lockout. Disables the front panel LOCAL button.

OUT

Enables or disables voltage/current output for the supply.

OVSET

Sets the over voltage protection trip point for the supply in volts

(default) or in millivolts.

RST

TRG

Resets the supply to the present voltage and current settings if the

output is disabled by OVP or foldback protection.

Implements programmed voltage and current settings which had been

in hold mode.

VMAX

VSET

Sets an upper soft limit on the supply’s programmed output voltage.

Sets the output voltage of the power supply in volts (default) or in

millivolts.

Release 1.2

Operation

Command Summary

Table 3.4 Query Commands

Command Description

AUXA?

AUXB?

CMODE?

DLY?

Asks for the state of the set value for the AUXA command

Asks for the state of the set value for the AUXB command

Asks for the power supply’s calibration mode status.

Asks for the programmable time delay setting before the supply

reports fault conditions.

ERR?

Asks for the most recent remote programming error which occurred in

the supply since the last time the error query command (ERR?) was

used.

FOLD?

HOLD?

ID?

Asks for the supply’s present foldback setting.

Asks for the present hold mode setting.

Asks for the power supply’s model name and master EPROM version.

Asks for the supply’s soft current limit setting.

IMAX?

IOUT?

ISET?

OUT?

OVSET?

REM?

ROM?

Measures the supply’s actual current output.

Asks for the supply’s present output current limit setting.

Asks for the present enabled/disabled status of the supply’s output.

Asks for the supply’s present over voltage protection limit.

Asks for the state of remote enable.

Asks for the version number of the master and slave EPROMs on the

interface PCB.

VMAX?

VOUT?

VSET?

Asks for the supply’s soft voltage limit setting.

Measures the supply’s actual voltage output.

Asks for the supply’s present output voltage setting.

Operating Manual for RS-232 for XPD Series Power Supply

Operation

Command Summary

Table 3.5 Calibration Commands

Command Description

CMODE

IDATA

IHI

Places the supply into calibration mode.

Calculates the slope and intercept for current programming.

Sets the current output to the high calibration point.

Sets the current output to the low calibration point.

Calculates the slope and intercept for current readback.

Sets the current output to the high readback point.

Sets the current output to the low readback point.

Calibrates the over voltage protection (OVP).

ILO

IRDAT

IRHI

IRLO

OVCAL

VDATA

VHI

Calculates the slope and intercept for voltage programming.

Sets the voltage output to the high calibration point.

Sets the voltage output to the low calibration point.

Calculates the slope and intercept for voltage readback.

Sets the voltage output to the high readback point.

Sets the voltage output to the low readback point.

VLO

VRDAT

VRHI

VRLO

Table 3.6 Status Commands

Command Description

ASTS?

Asks for the supply’s accumulated status register.

FAULT?

Asks for the supply’s fault register for the status preset operating

conditions.

MASK

Prevents the supply's previously unmasked operating conditions from

setting bits in the fault register.

STS?

Asks for the supply’s present status register.

UNMASK

Enables you to select those supply's operating conditions that you are

most interested in monitoring for fault occurrence.

UNMASK? Asks for the supply's fault conditions which are currently enabled

(unmasked).

Release 1.2

Operation

Command Reference

Table 3.7 Command Reference

Command

Description

ASTS?

Asks for the supply’s accumulated status register. The accumulated status

accumulated status query command (ASTS?) was last used, regardless of

whether the condition still exists. The accumulated status register has the

same bits, weights, and conditions as the status register. A bit in the

accumulated status register will be set at 1 if the corresponding bit in the

status register has been 1 (TRUE) at any time since the register was last

read. See “Accumulated Status, Status, and Fault Registers” on page 47.

The ASTS? query clears the status register.

Response: ASTS <status mask> where status mask is the decimal

equivalent of the total bit weights for the operating conditions as listed in the

status register.

AUXA <1/ON>,<0/OFF>

AUXA?

Controls the AUXA output signal level at rear panel connector J21-7. Active

low.

Initial value: AUXA 0

Asks for the present set value of the AUXA output signal.

Response: AUXA 0 (OFF)

AUXA 1 (ON)

AUXB <1/ON>,<0/OFF>

AUXB?

Controls the AUXB output signal level at rear panel connector J21-8. Active

low.

Initial value: AUXB 0

Asks for the present set value of the AUXB output signal.

Response: AUXB 0 (OFF)

AUXB 1 (ON)

CLR

Initializes the power supply to its power ON condition. If issued while in local

mode, CLR will force power supply settings to register default values as in

but these default settings will not come into effect until the power supply is

switched to remote mode operation. The CLR commands will clear faults

from the fault register. CLR will not reset CMODE.

CMODE <1/ON>,<0/OFF> CMODE ON places the power supply into calibration mode for processing

calibration commands.

Initial value: CMODE OFF or CMODE 0

CMODE?

Asks for the power supply’s calibration mode status.

Response: CMODE 0 (disabled)

CMODE 1 (enabled)

Operating Manual for RS-232 for XPD Series Power Supply

Operation

Command Reference

Command

Description

DLY <seconds>

Sets a programmable time delay employed by the supply before reporting

fault conditions. The power supply uses the time delay after receiving a new

output voltage or current setting via VSET or ISET, or after receiving RST,

TRG, or OUT ON commands. During the time delay, the power supply

disables CV, CC, and FOLD conditions from generating faults, preventing

possible nuisance foldback if the supply momentarily switches modes while

changing an output setting.

Range: 0 to 32 seconds, with 32ms resolution

Initial value: 0.5 second

DLY?

ERR?

Asks for the setting of the programmable time delay before the supply

reports fault conditions.

Response: DLY <seconds>

Asks for the most recent remote programming error. When the power

supply detects a programming error, it lights the ERR LED and sets the

ERR bit in the accumulated status and fault registers. If the error bit has

been masked using the MASK command, then the ERR bit in the registers

will not set. Once an error is detected, the remaining portion of the

command line is discarded. An error query clears the ERR bit in the

accumulated status register. See “Error Codes” on page 49.

Response: ERR <error number> Example: ERR 0 (if no error)

FAULT?

Asks for the state of the fault register. A bit is set in the fault register when a

fault arises for that condition. Lists the conditions which activate a fault bit.

You can use the MASK command to disable bits from being set in the fault

When a bit is set in the fault register it also asserts a signal on the J21-4

user signal line. You can tie the J21-4 fault line signal to the power supply's

own External Shutdown user line, J21-1, so that the shutdown signal goes

low (active) in the case of a user-defined fault.

The FAULT? query clears bits in the supply's fault register and fault line.

Response: FAULT <fault mask> where fault mask is the decimal equivalent

of the total bit weights for the operating conditions as listed in the fault

47.

FOLD

<2/CC>, <1/CV>,

<0/OFF>

Sets foldback mode for the supply. Foldback protection disables the power

supply output when the output enters the fold condition. Reset with the RST

command.

Example: Specify FOLD 1 or FOLD CV (Constant Voltage) when you want

the supply to operate in Constant Current mode and have foldback

protection disable the output if the supply switches to Constant Voltage

mode.

Initial value: FOLD 0/OFF

Release 1.2

Operation

Command Reference

Command

Description

FOLD?

Asks for the supply’s present foldback setting.

Response: FOLD <mode> where mode is:

0 (OFF) or

1 (CV or Constant Voltage mode) or

2 (CC or Constant Current mode)

GTL

Go to local. Returns the power supply to local control. See LLO (Local

Lockout). See also “Remote/Local Operation” on page 23.

HOLD <1/ON>,<0/OFF>

Enables or disables voltage/current setting hold mode for the supply. When

HOLD ON is specified, hold mode is enabled so that all voltage and current

settings which would normally be implemented by the supply are held until a

TRG (trigger) command is received. This feature allows you to synchronize

the operation of several supplies.

Initial value: HOLD OFF or HOLD 0

HOLD?

Asks for the present hold mode setting.

Response: HOLD 0 (OFF or disabled) or

HOLD 1 (ON or enabled)

ID?

Asks for the power supply model and the master EPROM version.

Response: ID <model name><version>

IDATA <Ilo>,<Ihi>

Calculates and records the slope and offset for programmed current using

ILO and IHI data. Set CMODE ON before using this command. See also the

calibration procedures in Section 4.

<Ilo> and <Ihi> are in <current> format.

IHI

In response to this command, the power supply sends a programmed

current value to the output terminal. This value is at the high end of the

power supply’s current range and is read by an external device connected

as part of the calibration procedure. Refer to this value as IHI and record it

to use as input with the IDATA command. Set CMODE ON before using this

command. See also the calibration procedures in Section 4.

ILO

In response to this command, the power supply sends a programmed

current value to the output terminal. This value is at the low end of the

power supply’s current range and is read by an external device connected

as part of the calibration procedure. Refer to this value as ILO and record it

to use as input with the IDATA command. Set CMODE ON before using this

command. See also the calibration procedures in Section 4 .

IMAX <current>

Sets an upper soft limit on the supply’s programmed output current. If the

soft limit is exceeded, or if the soft limit value is lower than the present

output current setting, the supply will ignore the command, turn on the

ERR LED, and set the ERR bit in the bit registers.

Range: 0 to model maximum output current (IMAX)

Initial value: model IMAX

IMAX?

Asks for the supply’s soft current limit setting.

Response: IMAX <current>

Operating Manual for RS-232 for XPD Series Power Supply

Operation

Command Reference

Command

Description

IOUT?

Measures the supply’s actual current output using the built-in current

readback circuitry.

Response: IOUT <current>

IRDAT <Ilo>,<Ihi>

IRHI

Calculates and records the slope and offset for readback voltage using

IRLO and IRHI data. Set CMODE ON before using this command. See also

the calibration procedures in Section 4.

<Ilo> and <Ihi> are in <current> format.

The power supply outputs a current value to an external device connected

as part of the calibration procedure and records a current readback value

internally. These values are at the high end of the programmed current

range. Refer to the output value as IRHI and record it to use as input with

the IRDAT command. Set CMODE ON before using this command. See

also the calibration procedures in Section 4.

IRLO

The power supply outputs a current value to an external device connected

as part of the calibration procedure and records a current readback value

internally. These values are at the low end of the programmed current

range. Refer to the output value as IRLO and record it to use as input with

the IRDAT command. Set CMODE ON before using this command. See

also the calibration procedures in Section 4.

ISET <current>

Sets the power supply’s output current in amps (default) or in milliamps.

This programmed current is the actual output in CC mode or the current

limit in CV mode.

Range: 0 to model maximum output current (IMAX)

Initial value: 0 amps

ISET?

LLO

Asks for the supply’s present output current setting. Does not apply to

current settings which are being held. See HOLD command.

Response: ISET <current>

Disables the front panel LOCAL switch. When LLO is in effect you can only

return to local mode using the GTL command. You can remove the local

lockout with the REM command. See also “Remote/Local Operation” on

page 23.

MASK <mnemonics>

Disables the supply's previously unmasked operating conditions from

setting bits in the fault and status registers. See “Accumulated Status,

Status, and Fault Registers” on page 47. Mnemonics are separated from

each other by commas and may be sent in any order.

Mnemonics: CV, CC, OV, OT, SD, FOLD, ERR, PON, REM, ACF, OPF,

SNSP

Note: UNMASK NONE = MASK ALL (Initial value)

MASK NONE = UNMASK ALL

Release 1.2

Operation

Command Reference

Command

Description

OUT <1/ON>,<0/OFF>

Enables or disables the supply’s voltage/current output. The supply will

continue to accept new commands while the output is disabled but these

will not be implemented until OUT ON or OUT 1 is received. OUT ON is the

default setting. When you start the supply in remote mode, the output is

enabled.

OUT OFF (or OUT 0) also sets the isolation signal on the rear panel J21

connector, line 3. You can use the to trip external relays to isolate the power

supply from the load.

Initial value: OUT ON (or OUT 1) for output enabled

OUT?

Asks for the present enabled/disabled status of the supply’s output

voltage/current.

Response: OUT 1 output enabled or

OUT 0 output disabled

OVCAL

Causes the master controller to perform automatic calibration of the

supply’s over voltage protection circuitry. Set CMODE ON before using this

command. Ensure jumper J2 on the RS-232 Interface PCB is connected for

remote operation.

OVSET <voltage>

Sets the supply’s over voltage protection trip point in volts (default) or in

millivolts. If the trip point is exceeded, or if the trip point value is lower than

the present output voltage setting, the supply will ignore the command, turn

on the ERR LED, and set the ERR bit in the accumulated status register.

Reset with the RST command.

Range: 0 to 110% of model maximum output voltage (VMAX)

Initial value: 110% of model VMAX

OVSET?

Asks for the supply’s present over voltage protection limit.

Response: OVSET <voltage>

REM <1/ON>,<0/OFF>

Remote Enable. When set to REM 0, the power supply is in local mode. If a

command is sent from the computer, the power supply does not respond

but remains in local mode. When set to REM 1, the power supply will enter

remote mode if a command is sent from the computer. See also

“Remote/Local Operation” on page 23.

REM?

ROM?

Asks for the state of the remote enable. See REM command.

Response: REM <state>

Asks for the version number of the master and slave EPROMs located on

the interface PCB.

Response: ROM M:<version> S:<version>

RST

Resets the supply to present voltage and current settings if the output is

disabled by over voltage or foldback protection. Output values may be

changed via VSET, ISET, and OVSET while the unit is disabled, but those

values will not take effect until RST is applied.

Operating Manual for RS-232 for XPD Series Power Supply

Operation

Command Reference

Command

Description

STS?

Asks for the supply’s present status register. Status conditions are stored in

the status register. Each bit represents a separate condition. When the

condition is true, the corresponding bit is 1 (true). Bits remain set in the

status register as long as the condition is true. See “Accumulated Status,

Status, and Fault Registers” on page 47.

Response: STS <status mask> where status mask is the decimal equivalent

of the total bit weights for the operating conditions as listed in the status

TRG

Implements programmed voltage and current settings which had been in

hold mode. The supply operates with previous values until the TRG (trigger)

command is sent.

UNMASK <mnemonics>

Enables you to select the supply operating conditions that you are most

interested in monitoring for fault occurrence. Mnemonics describing the

conditions are separated from each other by commas, and may be sent in

any order.

Specifying one or more mnemonics which describe the conditions (or the

decimal equivalent of their total bit weight) enables the selected conditions

to set bits in the supply’s fault and status registers during operation. A bit is

set in the fault register when the corresponding bit in the status register

changes from 0 to 1 and the corresponding bit in the mask register is 1. See

“Accumulated Status, Status, and Fault Registers” on page 47.

Mnemonics: CV, CC, OV, OT, SD, FOLD, ERR, PON, REM, ACF, OPF,

SNSP, ALL, NONE

Initial value: UNMASK NONE

UNMASK?

Asks for the supply's fault conditions which are currently enabled

(unmasked).

Response: UNMASK <fault mask> where fault mask is the decimal

equivalent of the total bit weights for the operating conditions as listed in the

status and fault registers See “Accumulated Status, Status, and Fault

Registers” on page 47.

VDATA <Vlo>,<Vhi>

VHI

Calculates and records the slope and offset for programmed voltage using

VLO and VHI data. Set CMODE ON before using this command. See also

the calibration procedures in Section 4.

<Vlo> and <Vhi> are in <voltage> format.

In response to this command, the power supply sends a programmed

voltage value to the output terminal. This value is at the high end of the

power supply’s voltage range and is read by an external device connected

as part of the calibration procedure. Refer to this value as VHI and record it

to use as input with the VDATA command. Set CMODE ON before using

this command. See also the calibration procedures in Section 4.

Release 1.2

Operation

Command Reference

Command

Description

VLO

In response to this command, the power supply sends a programmed

voltage value to the output terminal. This value is at the low end of the

power supply’s voltage range and is read by an external voltmeter

connected as part of the calibration procedure. Refer to this value as VLO

and record it to use as input with the VDATA command. Set CMODE ON

before using this command. See also the calibration procedures in

Section 4.

VMAX <voltage>

Sets an upper soft limit on the supply’s programmed output voltage. If the

soft limit is exceeded, or if the soft limit value is lower than the present

output voltage setting, the supply will ignore the command, turn on the

ERR LED, and set the ERR bit in the accumulated status register.

Range: 0 to model maximum output voltage (VMAX)

Initial value: model VMAX

VMAX?

VOUT?

Asks for the supply’s soft voltage limit setting.

Response: VMAX <voltage>

Measures the supply’s actual voltage output using the built-in voltage

readback circuitry.

Response: VOUT <voltage>

VRDAT <Vlo>,<Vhi>

VRHI

Calculates and records the slope and offset for readback voltage using

VRLO and VRHI data. Set CMODE ON before using this command. See

also the calibration procedures in Section 4 .

<Vlo> and <Vhi> are in <voltage> format.

The power supply outputs a voltage value to an external voltmeter

connected as part of the calibration procedure and records a voltage

readback value internally. These values are at the high end of the

programmed voltage range. Refer to the output value as VRHI and record it

to use as input with the VRDAT command. Set CMODE ON before using

this command. See also the calibration procedures in Section 4.

VRLO

The power supply outputs a voltage value to an external voltmeter

connected as part of the calibration procedure and records a voltage

readback value internally. These values are at the low end of the

programmed voltage range. Refer to the output value as VRLO and record it

to use as input with the VRDAT command. Set CMODE ON before using

this command. See also the calibration procedures in Section 4.

VSET <voltage>

VSET <-voltage>

Sets the power supply’s output voltage in volts (default) or in millivolts. This

programmed voltage is the actual output in CV (constant voltage) mode or

the voltage limit in CC (constant current) mode.

If you enter a negative voltage value, the power supply will assert a signal

on the J21-4 user signal line. You can use the user signal to trip external

relays to switch the output polarity.

Range: 0 to model maximum output voltage (VMAX)

Initial value: 0 volts

VSET?

Asks for the power supply’s present output voltage setting. Does not apply

to voltage settings which are being held. See HOLD command.

Response: VSET <voltage>

Operating Manual for RS-232 for XPD Series Power Supply

Operation

Accumulated Status, Status, and Fault Registers

The RS-232 option card uses three separate registers which are always active. They

are the accumulated status, status, and fault registers. You can use the status

commands shown in Table 3.6, “Status Commands” to activate the registers. The

bit register has twelve conditions, each assigned a bit weight. When querying a

relevant conditions.

Example:

ASTS?

Query the Accumulated Status register.

Controller response.

ASTS 771

771 = 512 + 256 + 2 + 1 = PON + REM + CC + CV

The accumulated status register shows that PON, REM, CC and CV have all been

active since the last accumulated status register query.

Table 3.8 shows the mnemonics and bit weights which correspond to each register

condition. You can select conditions you want to monitor in the fault and status

Release 1.2

Operation

Accumulated Status, Status, and Fault Registers

Table 3.8 Accumulated Status, Status, and Fault Registers

Condition

Mnemonic Bit Position Bit Weight

Constant voltage operation

Constant current operation

Not used

–

Overvoltage protection tripped

Over temperature protection tripped

Supply external shutdown active (J21-1)

Foldback mode operation

Remote programming error

128

256

FOLD

ERR

PON

Power ON (accumulated status, status

registers only)

Remote mode (accumulated status, status REM

registers only)

512

AC fail condition

ACF

1024

2048

4096

Output fail condition

Sense protection tripped

OPF

SNSP

Notes:

1. All mnemonics can be masked or unmasked.

2. The error (ERR) bit is reset in the accumulated status, status, and serial poll registers with an

error query (ERR?).

3. The accumulated status register is cleared with an accumulated status query (ASTS?).

4. A fault is cleared with a fault query (FAULT?).

Operating Manual for RS-232 for XPD Series Power Supply

Operation

Error Codes

If the ERR flag in the accumulated status or fault registers has been activated, an

ERR? query will return an error number which corresponds to an event described

in the following table. The ERR? query will also clear the ERR bit in the register.

Table 3.9 Error Codes

ERROR # ERROR IDENTIFICATION

EXPLANATION

No Errors

Unrecognized Character

Improper Number

Received a character such as @,*,$.

Received a numeric character but the

characters were not a proper number.

Example: VSET,±10.3

Unrecognized String

Syntax Error

Received an invalid command.

Received an incorrectly placed word,

number, separator, or terminator.

Example: OFF SRQ, VOUT 6, MASK,

ERR

Number Out of Range

Specified a value for the command

which was outside of the allowed range.

Attempt to Exceed Soft Limits Attempted to program a voltage or

current greater than the soft limit.

Example: VMAX 500; VSET 550 LF

Improper Soft Limit

Attempted to program a soft limit less

than the output value.

Data Requested without a

Query Being Sent

The controller requested data from the

power supply without first sending a

query command.

OVP Set Below Output

Sent an OVSET command with a trip

value lower than the output voltage.

Slave Processor Not

Responding

The interface PCB slave processor did

not respond.

Illegal Calibration

Attempted calibration when the supply

was not in calibration mode. See

CMODE command.

Release 1.2

Operation

Troubleshooting

WARNING

Exercise caution when using and servicing power supplies. High energy levels can

be stored at the output voltage terminals on all power supplies in normal operation.

In addition, potentially lethal voltages exist in the power circuit and the output

connector of power supplies which are rated at 40V and over. Filter capacitors store

potentially dangerous energy for some time after power is removed.

Diagnostic

LEDs

This section describes the diagnostic LEDs found on the RS-232 interface.

Computer Operating Properly (COP) LEDs The RS-232 interface provides

three diagnostic LEDs, located at D5, D4, and D1 on its PCB. Refer to Figure 2.3,

‘RS-232 Interface PCB” on page 18, for their locations. At present, these LEDs

turn on to signal COP events for the interface's microprocessors. Issue a RST

(reset) command to turn off the diagnostic LEDs.

The green COP LED at circuit designation D5 indicates that the RS-232 interface

microprocessor successfully recovered from a timeout error due to a

communications bus error. The event is transparent to the RS-232 communications

line continues to function normally.

The red COP LED at D4 indicates that a transparent restart caused by noise in the

master processor circuitry has occurred.

The red COP LED at D1 indicates that a transparent restart caused by noise in the

slave processor circuitry has occurred.

Operating Manual for RS-232 for XPD Series Power Supply

Section 4. Calibration

Introduction

WARNING

Exercise caution when using and servicing power supplies. High energy levels can

be stored at the output voltage terminals on all power supplies in normal operation. In

addition, potentially lethal voltages exist in the power circuit and the output connector

of power supplies which are rated at 40V and over. Filter capacitors store potentially

dangerous energy for some time after power is removed.

You can calibrate the RS-232 interface by adjusting the signal levels on the interface

card so that they correspond to the expected signal levels on the power supply's main

assembly. You may need to recalibrate the interface if you replace parts either on the

interface board or on the main power supply board, or if the unit falls out of

specification due to component aging drifts.

You can calibrate the RS-232 Interface for:

•

Voltage program

Voltage readback

Current program

Current readback

Overvoltage protection

The following equipment will be required to accurately calibrate your unit:

•

Digital Voltmeter, 5 1/2 digit, 0.1% accuracy or better, with test leads

Current sensing shunt resistor, rated for 150% of maximum output current,

0.25% accuracy or better

•

Connection wires rated for the unit's maximum output current and voltage

An RS-232 equipped computer to send the calibration commands to the unit

Calibrate the unit according to the following procedures, referring to “Command

Reference” for more information about the calibration commands used.

The calibration procedures in this section are designed to be performed at an ambient

temperature of 25°C ± 5°C.

Release 1.2

Calibration

Voltage Mode Calibration

Voltage 1. Disconnect the load from the power supply which is to be calibrated.

Calibration

2. Connect a voltmeter across the power supply’s output terminals.

Setup

Power Supply

Positive Output

Negative Output

VOLTMETER

Figure 4.1 Voltage Calibration Setup

Voltage 1. Set the power supply for calibration as in Figure 4.1.

Program

Calibration

Procedure

2. Activate calibration mode by sending command CMODE ON or CMODE 1 to

the power supply.

3. Send command VLO; ILO to the power supply. Measure and record the output

shown on the external voltmeter.

4. Send command VHI; IHI to the supply. Measure and record the output voltage

as shown on the external voltmeter.

5. Send the command VDATA <vlo>,<vhi> where <vlo> and <vhi> are the values

read from the voltmeter when the VLO and VHI commands were sent. When the

power supply is calibrated, the low to high voltage program calibration values

are stored as constants.

6. Program the supply at various levels using the VSET command to confirm that

the calibration was successful and that linearity is observed. See the voltage

program accuracy specification in Section 1.

7. Turn off calibration mode by sending the command CMODE OFF or CMODE 0

to the power supply.

Operating Manual for RS-232 for XPD Series Power Supply

Calibration

Voltage Mode Calibration

Voltage 1. Set the power supply for calibration as in Figure 4.1.

Readback

Calibration

Procedure

2. Activate calibration mode by sending command CMODE ON or CMODE 1 to

the power supply.

3. Send command VRLO; IRLO to the power supply. Wait for the supply to settle.

Measure and record the output shown on the external voltmeter. Send VRLO

again.

4. Send VRHI; IRHI to the supply. Wait for the supply to settle. Measure and

record the output voltage shown on the external voltmeter. Send VRHI again.

5. Send the command VRDAT <vlo>,<vhi> where <vlo> and <vhi> are the values

read from the voltmeter after the VRLO and VRHI commands were sent. The

processor calculates the offset value required to calibrate the power supply.

When the power supply is calibrated, the low to high voltage readback

calibration values (offsets) are stored as constants.

6. Use commands VSET and VOUT? commands to confirm that the calibration

was successful and that linearity is observed. Refer to the voltage readback

accuracy specification in Section 1.

7. Turn off calibration mode by sending the command CMODE OFF or CMODE 0

to the power supply.

Release 1.2

Calibration

Current Mode Calibration

Current 1. Disconnect the load from the power supply to be calibrated.

Calibration

2. Connect a shunt across the supply's output terminals.

Setup

3. Connect a voltmeter across the shunt.

Power Supply

Positive Output

Negative Output

Current Sensing

Resistor

VOLTMETER

Figure 4.2 Current Calibration Setup

Current 1. Connect the shunt and voltmeter to the power supply as shown in Figure 4.2.

Program

Calibration

Procedure

2. Activate calibration mode by sending command CMODE ON or CMODE 1 to

the power supply.

3. Send command ILO; VLO to the power supply. Measure and record the output

shown on the external voltmeter.

4. Send command IHI; VHI to the supply Measure and record the output voltage

shown on the external voltmeter.

5. Calculate ILO and IHI from the voltages read from the external voltmeter and

the shunt resistance. I=V/R.

6. Send the command IDATA <ilo>,<ihi> to the power supply. <ilo> and <ihi> are

the current values obtained from sending the ILO and IHI commands to the

power supply. When the power supply is calibrated, the low to high current

program calibration values are stored as constants.

7. Program the supply at various levels using the ISET command to confirm that

the calibration was successful and that linearity is observed. Refer to the current

program accuracy specification in Section 1.

8. Turn off calibration mode by sending the command CMODE OFF or CMODE 0

to the power supply.

Operating Manual for RS-232 for XPD Series Power Supply

Calibration

Current Mode Calibration

Current 1. Connect the current shunt and voltmeter to the power supply as shown in

Readback

Calibration

Procedure

Figure 4.2.

2. Activate calibration mode by sending command CMODE ON or CMODE 1 to

the power supply.

3. Send command IRLO; VRLO to the power supply. Wait for the supply to settle.

Measure and record the output voltage shown on the external voltmeter. Send

IRLO again.

4. Send command IRHI; VRHI to the supply. Wait for the supply to settle. Measure

and record the output voltage shown on the external voltmeter. Send IRHI again.

5. Calculate IRLO and IRHI from the voltages taken from the external voltmeter

and the shunt resistance. I=V/R.

6. Send the command IRDAT <ilo>,<ihi> to the power supply. <ilo> and <ihi> are

the current values obtained from sending the IRLO and IRHI commands to the

power supply. When the power supply is calibrated, the low to high current

readback calibration values are stored as constants.

7. Program the supply at various levels using the ISET command to confirm that

the calibration was successful and that linearity is observed. Refer to the current

readback accuracy specification in Section 1.

8. Turn off calibration mode by sending the command CMODE OFF or CMODE 0

to the power supply.

Release 1.2

Calibration

Over Voltage Protection (OVP) Calibration

We recommend that you perform OVP calibration every six months. Connecting a

digital voltmeter as in “Voltage Calibration Setup” is optional.

1. Disconnect all loads from the power supply.

2. Ensure that jumper J2 on the interface PCB is CLOSED to enable remote OVP

calibration (Jumper J2 is closed at the factory). See Figure 2.3 RS-232 Interface

PCB, p. 18 for the location on the PCB of jumper J2.

3. Activate calibration mode by sending command CMODE ON or CMODE 1 to

the power supply.

4. Send the command OVCAL to the power supply. The ADDR LED will light

during OVP calibration. Calibration is complete when the ADDR LED turns off.

This may take a few minutes.

5. Use the OVSET, OVSET?, and VSET commands to trip the OVP level,

confirming that the calibration was successful. When you trip the OVP level, the

red OVP LED will light and the voltage will drop to zero. Send the command

RST to clear the OVP condition. Refer to the OVP program accuracy

specification in Section 1.

6. Turn off calibration mode by sending the command CMODE OFF or CMODE 0

to the power supply.

Operating Manual for RS-232 for XPD Series Power Supply

Xantrex Technology Inc.

8999 Nelson Way

Burnaby, British Columbia

Canada V5A 4B5

604 422 8595 Tel

604 421 3056 Fax

800 667 8422 Toll Free North America

[email protected]

www.xantrex.com

PRINTED IN CANADA

TM-RSPD-01XN

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