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PST & PSS & PSH SERIES PROGRAMMABLE POWER SUPPLY

PROGRAMMER MANUAL

i

CONTENTS PAGE

INTRODUCTION.............................................................................

CONNECTING POWER SUPPLY VIA GPIB INTERFACE..

CONNECTING POWERSUPPLY VIA RS232 INTERFACE

INPUT AND OUTPUT QUEUE………………………………..

COMMANDS AND SYNTAX………………………………….

DETAILS OF COMMAND REFERENCE……………………

STATUS AND ERROR REPORTING………………………....

PST & PSS & PSH SERIES PROGRAMMABLE POWER SUPPLY

PROGRAMMER MANUAL

ii 

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PROGRAMMER MANUAL

1

1. INTRODUCTION

In the modern automatic measurement system, communication

between equipments and computers is essential. The measured

procedures can be varied with users’testing programs, therefore, the

programmable power supply can be operated remotely from an

instrument controller or computer across the RS232 interface (optional)

orGPIB (optional).

Interface selection and setup

The GPIB address can be changed in normal operation condition. Press

[SHIFT] key and [LOCAL]key on the front panel, in which the last

transmitting interface settings will be displayed. Select interface and

press [ENTER], then select the baud rate (or GPIB address) and press

[ENTER] to confirm the setting by using the knobs. Finally, select

“save” and press [ENTER] to store the setup.

2. CONNECTING THE PROGRAMMABLE POWER

SUPPLYVIA GPIB INTERFACE

The GPIB interface capabilities:

The GPIB interface of the programmable power supply corresponds to

the standard of IEEE488.1-1987, IEEE488.2-1992 and SCPI-1994. The

GPIB interface functions are listed as follows:

SH1(Source Handshake) : The power supply can transmit multilane

messages across the GPIB.

AH1(Acceptor Handshake) : The power supply can receive multilane

messages across the GPIB.

T6(Talker) : Talker interface function includes basic

talker, serial poll, and unaddress if MLA

capabilities, without talk only mode

function.

PST & PSS & PSH SERIES PROGRAMMABLE POWER SUPPLY

PROGRAMMER MANUAL

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L4(Listener) :The power supply becomes a listener

when the controller sends its listen

address with the ATN (attention) line

asserted. The power supply does not

have listen only capability.

SR1 (Service Request) : The power supply asserts the SRQ

(Service request) line to notify the

controller when it requires service.

RL1 (Remote/Local) : The power supply responds to both the

GTL(Go to Local) and LLO(Local Lock

Out) interface messages.

PP0 (ParallelPoll) : The power supply has no Parallel Poll

interface function.

DC1 (Device Clear) : The power supply has Device clear

capability to return the device to power

on status.

DT0(Device Trigger) : The power supply has no Device Trigger

interface function.

C0(Controller) : The power supply can not control other

devices.

Notes for GPIB installation

When the programmable power supply is set up with a GPIB system,

please check the following things:

lOnly a maximum of 15 devices can be connected to a single GPIB

bus.

lDo not use more than 20m of cable to connect devices to a bus.

lConnect one device for every 2m of cable used.

lEach device on the bus needs a unique device address. No two

devices can share the same device address.

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lTurn on at least two-thirds of the devices on the GPIB system while

using the system.

lDo not use loop or parallel structure for the topology of GPIB

system.

Computer’s Connection

A personal computer with a GPIB card is the essential facilities in order

to operate the programmable power supply via GPIB interface.

The connections between power supply and computer are following:

I. Connect one end of a GPIB cable to the computer.

II. Connect the other end of the GPIB cable to the GPIB port on

the programmable power supply.

III. Turn on the programmable power supply.

IV. Turn on the computer.

The GPIB connection testing

If you want to test whether the GPIB connection is working or not, you

can send a GPIB command from computer. For instance, the query

command

*idn?

should return the Manufacturer, model number, serial number and

firmware version in the following format:

GW.Inc,PST-3202,A000000,FW1.00

If you do not receive a proper response from the power supply, please

check if the power is on, the GPIB address is correct, and all cable

connections are active.

PST & PSS & PSH SERIES PROGRAMMABLE POWER SUPPLY

PROGRAMMER MANUAL

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3. CONNECTING THE PROGRAMMABLE POWER

SUPPLY VIA RS232 INTERFACE

The RS 232 interface capabilities:

The RS232 interface provides a point -to-point connection between two

items of equipment such as a computer and the power supply. There are

some parameters you need to set on the both sides. Once you have set

these parameters, you can control the power supply through the RS232

interface.

lBaud rate: You can set rates of 1200, 2400, 4800 or 9600 baud.

lParity bit: none.

lData bit: 8 bits.

lStop bit: 1 stop bit.

lData flow control: none.

Notes for RS232installation

The power supply is a DTE device with a 9-pin D-type shell RS232

connector located on the rear panel. Figure 1shows the equipment of

9-pin connector (male) with its pin number assignments. Figure 2shows

the wiring configuration for DB9 to DB9. When the programmable

power supply is set up with a RS232 interface, please check the

following points:

lDo not connect the output line of one DTE device to the output line

of the other.

lMany devices require a constant high signal on one or more input

pins.

lEnsure that the signal ground of the equipment is connected to the

signal ground of the external device.

lEnsure that the chassis ground of the equipment is connected to the

chassis ground of the external device.

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PROGRAMMER MANUAL

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lDo not use more than 15m of cable to connect devices to a PC.

lEnsure the same baud rate is used on the device as the one used on

PC terminal.

lEnsure the connector for the both side of cable and the internal

connected line are met the demand of the instrument.

1. No connection

2. Receive Data(RxD) (input)

3. Transmit Data(TxD) (output)

4. No connection

5. Signal Ground(GND)

6. No connection

7. No connection

8. No connection

9. No connection

Figure 1 Pin assignments of the RS232 connector onthe rear panel for DB-9-D

PST & PSS & PSH SERIES PROGRAMMABLE POWER SUPPLY

PROGRAMMER MANUAL

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Figure 2 Wiring configuration for DB9 to DB9

Computer’s Connection

A personal computer with a COM port is the essential facilities in order

to operate the programmable power supply via RS232interface.

The connections between power supply and computer are as follows:

I. Connect one end of a RS232 cable to the computer.

II. Connect the other end of the cable to theRS232 port on the

programmable power supply.

III. Turn on the programmable power supply.

IV. Turn on the computer.

EQUIPMENT

(DB9,DTE)

COMPUTER

(DB9, DTE)

Pin2

Pin3

Pin5

Pin3

Pin2

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PROGRAMMER MANUAL

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The RS232connection testing

If you want to test whether the RS232 connection is working or not, you

can send a command from computer. For instance, using a terminal

program send the query command

*idn?

should return the Manufacturer, model number, serial number and

firmware version in the following format:

GW.Inc,PST-3202,A000000,FW1.00

If you do not receive a proper response from the power supply, please

check if the power is on, the RS232 baud rateare the same on both sides ,

and all cable connections are active.

4. INPUT AND OUTPUT QUEUE

The design of 128 bytes input queue and 128 bytes output queue for

storing the pending commands or return messages is to prevent the

transmitted commands of remote control and return messages from

missing. As the maximum stored capacity for Error/Event Queue is 20

groups of messages, it should be noted that input data exceeding the

capacity by using these buffers will cause data missing.

5. COMMANDS AND SYNTAX

The GPIB commands of the programmable power supply are

compatible with IEEE-488.2 and SCPI standards

SCPI

SCPI (Standard Commands for Programmable Instruments) is a standard

that created by an international consortium of the major test and

measurement equipment manufacturers. The IEEE-488.2syntax has been

adopted by SCPI to provide common commands for the identical

functions of different programmable instruments.

PST & PSS & PSH SERIES PROGRAMMABLE POWER SUPPLY

PROGRAMMER MANUAL

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Figure 3 the relationship between IEEE-488.1, IEEE-488.2, and SCPI

As shown in the figure 3, the IEEE-488.1 standard locates at layer A, the

layer A belongs to the protocol of interface function on the GPIB bus.

The source handshake (SH), acceptor handshake (AH) and talker are

included to this layer (10 interface functions totally).

At layer B, the syntax and data structure could be the essence of entire

IEEE-488.2 standard. The syntax defines the function of message

communication, which contain the <PROGRAM MESSAGE> (or simply

“commands”) and <RESPONSE MESSAGE>. The two kinds of messages

represent the syntax formation of device command and return value. The

data structure is the constitution of status reporting, which IEEE-488.2

standard have been defined.

The common commands and queries are included to layer C. Commands

and queries can be divided into two parts: mandatory and optional.

Commands modify control settings or tell the instrument to perform a

specific action. Queries cause the instrument to send data or status

information back to the computer. A question mark at the end of a

SCPI

IEEE-488.2 IEEE-488.2

SCPIIEEE-488.1

A AB B CC DD

Interface Function

Syntax & Status Data Structure

Common Command & Queries

SCPI

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command identifies it as a query.

Layer D is interrelated with device information. Different devices have

different functions. SCPI command sets belong to this layer.

Command Syntax

If you want to transfer any instructions to an instrument, and comply

with SCPI, there are three basic elements must be included.

lCommand header

lParameter (if required)

lMessage terminator or separator

Command Header

The command header has a hierarchical structure that can be represented

by a command tree (Figure 4).

The top level of the tree is the root level. A root node is located at the

root level. A root node and one or more lower-level nodes form a header

path to the last node called the leaf node.

Figure 4: Tree hierarchy

Leaf node

:SYSTem

:AUTO

Root node

:ERRor

:STATe

:STARt

:CYCLe

Lower-level node

LeafNode

PST & PSS & PSH SERIES PROGRAMMABLE POWER SUPPLY

PROGRAMMER MANUAL

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The command header is configured by header path and leaf node. Figure 5

shows the command header for the leaf node indicated in Figure 4.

Figure 5 Command Header

Parameter

If the commands have parameters, the values have to be included. In this

manual, when we expressed the syntax of the command, the < > symbols

are used for enclosing the parameter type. For instance, the syntax of the

command in Figure 6 includes the Boolean parameter type.

NOTE: Do not include the <, >, or | symbols when entering the actual

value for a parameter.

Figure 6 Command Header with Parameter

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Table 1 defines the Boolean and other parameter types for the

programmable power supply.

Parameter Type Description Example

Boolean Boolean numbers or

values

0, 1

NR1 Integers 0, 1, 18

NR2 Decimal numbers 1.5, 3.141, 8.4

NR3 Floating point numbers 4.5E-1, 8.25E+1

String Alphanumeric characters

“No error”

Table 1: Parameter Types for Syntax Descriptions

Message Terminator and MessageSeparator

I. GPIB messageterminators

In accordance with IEEE 488.2 standard, any of the following message

terminators are acceptable:

lLF^END Line feed code (hexadecimal 0A) with END

message

lLF Line feed code

l<dab>^END Last data byte with END message

These terminators are compatible with most application programs. A

semicolon separates one command from another when the commands

appear on the same line.

PST & PSS & PSH SERIES PROGRAMMABLE POWER SUPPLY

PROGRAMMER MANUAL

12 

II. RS232 message terminators

As there is no signal of end message on RS232 bus,therefore, use LF

as message terminator. When a series of commands are sent to the

instrument, it must add a LF to be a judgment for message terminator.

As for query command, the return message of the instrument is also

added a LF for PC to judge message terminator.

Entering Commands

The standards that govern the command set for the programmable power

supply allow for a certain amount of flexibility when you enter

commands. For instance, you can abbreviate many commands or

combine commands into one message that you send to the programmable

power supply. This flexibility, called friendly listening, saves

programming time and makes the command set easier to remember and

use.

CommandCharacters

The programmable power supplies are not sensitive to the case of

command characters. You can enter commands in either uppercase or

lowercase.

You can execute any command with white space characters. You must,

however, use at least one space between the parameter and the command

header

Abbreviating Commands

Most commands have a long form and a short form. The listing for

each command in this section shows the abbreviations in uppercase.

For instance, you can enter the query :CHANnel1:VOLTage 1.23

simply as :CHAN1:VOLT 1.23

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Because the programmable power supply hypothesis that a command

starts from the root, you have the option of beginning the initial

command header with a colon (:).

Combining Commands

You can use a semicolon (;) to combine commands.But continuously

query command will cause message missing. For example:

CHAN1:VOLT ?;CURR ?

If the command that follows the semicolon has a different header path

from the root level, you must use a colon to force a return to the root

level:

:CHAN1:VOLT 1.23;:OUTP:COUP:TRAC 1

If the command that follows the semicolon has the same header path, you

may omit the colon and the path and state only the new leaf node. For

example:

:CHAN1:VOLT 12.34;CHAN1:CURR 1.55

is equal to

:CHAN1:VOLT 12.34;CURR 1.55

You can combine commands and queries into the same message. Note,

for example, the following combination:

:CHAN1:VOLT 12.34;VOLT ?

Synopsis of Commands

The tables in this section summarize the command of the programmable

power supply. These tables divide the commands into three functional

classifications:

lGeneral Setting Commands

lStatus Commands

lMiscellaneousCommands

The tables also provide a brief explanation of each command.

PST & PSS & PSH SERIES PROGRAMMABLE POWER SUPPLY

PROGRAMMER MANUAL

14 

lGeneral Setting Commands

Table 2 lists the general setting commands that control and query the

settings of the power supply.

Table 2: General Setting Commands

Command Explanation

:CHANnel<x>:CURRent <NR2> ★1 Sets the value of current.

:CHANnel<x>:CURRent ? ★1 Return the value of current.

:CHANnel<x>:VOLTage <NR2> ★1 Sets the value of voltage.

:CHANnel<x>:VOLTage ? ★1 Return the value ofvoltage.

:CHANnel<x>:MEASure:CURRent ?

★1 Returns actual output current.

:CHANnel<x>:MEASure:VOLTage ? ★1 Returns actual output voltage.

:CHANnel<x>:PROTection:CURRent

<Boolean> ★

1 Sets the overcurrent protection

(OCP) on or off.

:CHANnel<x>:PROTection:CURRent ?

★1 Returns the state of the over-

current protection (OC

setting as either on or off.

:CHANnel<x>:PROTection:VOLTage

<NR2> ★1 Sets the value of overvoltage

protection(OVP).

:CHANnel<x>:PROTection:VOLTage ?

★1 Returns the overvoltage

protection(OVP) setting.

:OUTPut:COUPle:TRACking <NR1> ★2 Sets the output of the

power

supply working on Series-

tracking or Parallel-tracking

independent mode.

:OUTPut:COUPle:TRACking ? ★

2 Returns the output of the

power supply working mode.

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15 

:OUTPut:PROTection:CLEar

Clears over-voltage and over-

current and

over temperature protection error message.

:OUTPut:STATe <Boolean> Sets the output state on oroff.

:OUTPut:STATe ?Returns the output state on or off.

Remark:

The mark “★1” means the <X>for PSS and PSH series can only be 1.

The mark “★2” means the PSS and PSH series do not have the function.

lStatus Commands

Table 3 lists the status commands that set and query the various

registers and queues that make up the status and event structure of

the programmable power supply.

Table 3: Status Commands

*CLS Clears the status data structures.

*ESE <NR1>

Sets the Event Status Enable Register

(ESER).

*ESE?

Returns contents of Event Status Enable

*ESR?

Returns and clear the contents of Standard

Event Status Register (SESR).

*SRE <NR1> Sets contents of Se

rvice Request Enable

PST & PSS & PSH SERIES PROGRAMMABLE POWER SUPPLY

PROGRAMMER MANUAL

16 

*SRE?

Returns contents of Service Request

Enable Register (SRER).

*STB? Reads Status Byte Register (SBR).

:STATus:OPERation:COND

ition ? Returns the contents of the OPERation

condition register. Returns NR1.

:STATus:OPERation:ENAB

le <NR1>

Sets the contents of the enable mask for the

OPERation event register.

:STATus:OPERation:ENAB

le ?

Returns the contents of the enable mask for

the OPERation event register. Returns NR1.

:STATus:OPERation:EVEN

t ? Query the contents of the OPERation

Event

:STATus:PRESet

Presets the OPERation and QUEStionable

status registers.

:STATus:QUEStionable:CO

NDition ? Returns the contents of the OPERation

condition register. Returns NR1.

:STATus:QUEStionable:EN

ABle <NR1> Sets the co

ntents of the enable mask for the

QUEStionable enable register.

:STATus:QUEStionable:EN

ABle ?

Query the contents of the Questionable

Enableregister.

:STATus:QUEStionable:EV

ENt ? Query the contents of the QUES

tionable

Event register.

lMiscellaneous Commands

Table 4 lists the miscellaneous commands that control general

housekeeping functions of the programmable power supply.

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