GW Instek Tequipment PEL-3000 Owner's manual

DC Electronic Load
PEL-3000
PROGRAMMING MANUAL
VERSION: 1.11
ISO-9001 CERTIFIED MANUFACTURER

This manual contains proprietary information, which is protected by
copyright. All rights are reserved. No part of this manual may be
photocopied, reproduced or translated to another language without
prior written consent of Good Will company.
The information in this manual was correct at the time of printing.
However, Good Will continues to improve products and reserves the
rights to change specification, equipment, and maintenance
procedures at any time without notice.
Good Will Instrument Co., Ltd.
No. 7-1, Jhongsing Rd., Tucheng Dist., New Taipei City 236, Taiwan.

Table of Contents
1
Table of Contents
INTERFACE OVERVIEW ..................................................... 2
Front Panel Overview ............................. 3
Rear Panel Overview ..............................4
Interface Configuration .......................... 5
COMMNAND OVERVIEW ................................................ 16
Command Syntax ................................. 16
Command List ..................................... 21
Error Messages.................................... 90

PEL-3000 Programming Manual
2
INTERFACE OVERVIEW
This chapter describes basic configuration of
IEEE488.2 based remote control.
Front Panel Overview ........................................................ 3
Rear Panel Overview.......................................................... 4
Interface Configuration ..................................................... 5
Configure to USB Remote Interface....................................................................... 5
Configure GPIB Interface........................................................................................ 6
Configure RS232C..................................................................................................... 7
RS232C/USB Remote Control Function Check................................................... 8
Using Realterm to Establish a Remote Connection.............................................. 9
GPIB Function Check ............................................................................................ 13

INTERFACE OVERVIEW
3
Front Panel Overview
(PEL-3021/PEL-3041 shown)
I MON OUT TRIG OUT
1.5 - 150V
175W
0 - 35A
P0
P1
P4
P7
CAL.
P2
P5
P8
Lock
P3
P6
P9
Utility
Local
File
0
1
4
7
2
5
8
3
6
9
EnterClear
Shift
Preset
Load On/
Off
Main
Help
FUNC
Short
Air inlet LCD Display Power key
FUNC/File
Help/Utility
Short
Load On/Off
USB Port, Preset
and Shift keys
Number pad, Clear/
Lock and Enter keys
Main/Local
Scroll wheel
Function keys
Input
terminals
I MON OUT,
TRIG OUT

PEL-3000 Programming Manual
4
Rear Panel Overview
(PEL-3021 / PEL-3041 shown)
47 - 63 Hz
90 VA MAX.
AC
100 - 120 VAC
200 - 240 VAC
FRAME CONT
J 1
J 2
SER. NO. LB
RS232C
GPIB
WARNING
TO AVOID ELECTRIC SHOCK THE POWER CORD
DO NOT REMOVE COVERS.
NO OPERATOR SERVICEABLE COMPONENTS INSIDE.
PROTECTIVE GROUNDING CONDUCTOR MUST BE
REFER SERVICING TO QUALIFIED PERSONNEL.
CONNECTED TO GROUND.
Remote sense
inputs
Frame control ports,
J1, J2
RS232C port
USB port
USB device port
Exhaust fanGPIB Power socket
and switch
Rear panel
inputs

INTERFACE OVERVIEW
5
Interface Configuration
Configure to USB Remote Interface
USB
configuration
PC side
connector
Type A, host
PEL-3000 side
connector
Rear panel Type B, slave
Speed
2.0 (full speed)
USB Class
USB CDC AMC
Note
Before USB can be used for remote control, it is
necessary to install the PEL-3000 USB device
driver, located on the accompanying User Manual
CD.
Operation
1. Connect the USB cable to the rear panel USB B
port.
2. Press
Shift
+
Utility
Help
> Interface[F3] and set
the Interface setting to USB.

PEL-3000 Programming Manual
6
Configure GPIB Interface
To use GPIB, the optional GPIB port must be installed. See the user
manual for details.
Operation
1. Ensure the PEL-3000 is off before proceeding.
2. Connect a GPIB cable from a GPIB controller to
the GPIB port on the PEL-3000.
3. Turn the PEL-3000 on.
4. Press
Shift
+
Utility
Help
> Interface[F3] and set
the Interface setting to GPIB.
5. Set the GPIB address.
GPIB address
0~30
GPIB constraints
 Maximum 15 devices altogether, 20m cable length,
2m between each device
 Unique address assigned to each device
 At least 2/3 of the devices turned On
 No loop or parallel connection
Pin Assignment
112
1324
Pin
Signal
Pin
Signal
1~4
Data I/O 1~4
13~16
Data I/O 5~8
5
EOI
17
REN
6
DAV
18
Ground (DAV)
7
NRFD
19
Ground (NRFD)
8
NDAC
20
Ground (NDAC)
9
IFC
21
Ground (IFC)
10
SRQ
22
Ground (SRQ)

INTERFACE OVERVIEW
7
11
ATN
23
Ground (ATN)
12
SHIELD Ground
24
Single GND
Configure RS232C
RS232C
Configuration
Connector
DB-9, Male
Baud Rate
2400, 4800, 9600, 19200, 38400
Stop Bit
1, 2
Parity
None, Odd, Even
Operation
1. Connect an RS232C cable from the PC to the
rear panel RS232 port.
2. Press
Shift
+
Utility
Help
> Interface[F3] and
set the Interface setting to RS232.
3. Set the Baud Rate, Stop Bit and Parity settings.
Pin Assignment
1 2 3 4 5
6 7 8 9
2: RxD (Receive data)
3: TxD (Transmit data)
5: GND
4, 6 ~ 9: No connection
PC Connection
Use a null modem connection as shown in the
diagram below.
PEL-3000 PC
RxDPin2 RxD Pin2
GNDPin5 GND Pin5
TxD Pin3
TxDPin3

PEL-3000 Programming Manual
8
RS232C/USB Remote Control Function Check
Functionality
check
Invoke a terminal application such as
RealTerm. For RS232C, set the COM port, baud
rate, stop bit, data bit and parity accordingly.
To check the COM settings, see the Device
Manager in the PC. For WinXP; Control panel
→ System → Hardware tab.
Run this query command via the terminal after
the instrument has been configured for
RS232/USB remote control (page 5).
*idn?
This should return the Manufacturer, Model
number, Serial number, and Firmware version
in the following format.
 GW-INSTEK,PEL-3000, XXXXXXXXXXXX,
V.X.X.X.X
Manufacturer: GW-INSTEK
Model number : PEL-3000
Serial number : XXXXXXXXXXXX
Firmware version : V.X.X.X

INTERFACE OVERVIEW
9
Using Realterm to Establish a Remote Connection
Background
Realterm is a terminal program that can used to
communicate with a device attached to the
serial port of a PC or via an emulated serial port
via USB.
The following instructions apply to version
1.99.0.27. Even though Realterm is used as an
example to establish a remote connection, any
terminal program can be used that has similar
functionality.
Note
Realterm can be downloaded on Sourceforge.net
free of charge.
For more information please see
http://realterm.sourceforge.net/
Operation
1. Download Realterm and install according to the
instructions on the Realterm website.
2. Connect the PEL-3000 via USB (page 5) or via
RS232 (page 7).
3. If using RS232, make note of the configured
baud rate, stop bits and parity.
4. Go to the Windows device manager and find
the COM port number for the connection.
For example, go to the Start menu > Control
Panel > Device Manager
Double click the Ports icon to reveal the
connected serial port devices and the COM port
for the each connected device.

PEL-3000 Programming Manual
10
If using USB, the baud rate, stop bit and parity
settings can be viewed by right-clicking the
connected device and selecting the Properties
option.
5. Start Realterm on the PC as an administrator.
Click:
Start menu>All Programs>RealTerm>realterm
Tip: to run as an administrator, you can right
click the Realterm icon in the Windows Start
menu and select the Run as Administrator
option.

INTERFACE OVERVIEW
11
6. After Realterm has started, click on the Port tab.
Enter the Baud, Parity, Data bits, Stop bits and
Port number configuration for the connection.
The Hardware Flow Control, Software Flow
Control options can be left at the default
settings.
Press Open to connect to the PEL-3000.

PEL-3000 Programming Manual
12
7. Click on the Send tab.
In the EOL configuration, check on the +CR and
+LF check boxes.
Enter the query:
*idn?
Click on Send ASCII.
8. The terminal display will return the following:
GW, PEL-3XXX,EXXXXXXX,VX.XX.XXX
(manufacturer, model, serial number, version)
9. If Realterm fails to connect to the PEL-3000,
please check all the cables and settings and try
again.

INTERFACE OVERVIEW
13
GPIB Function Check
Functionality
check
Please use the National Instruments
Measurement & Automation Controller
software to confirm GPIB/LAN functionality.
See the National Instrument website,
http://www.ni.com for details.
Operation
1. Start the NI Measurement and
Automation Explorer (MAX)
program. Using Windows, press:
Start>All Programs>National
Instruments>Measurement & Automation
2. From the Configuration panel access;
My System>Devices and Interfaces>GPIB0

PEL-3000 Programming Manual
14
3. Press the Scan for Instruments button.
4. In the Connected Instruments panel the PEL-3000
should be detected as Instrument 0 with the
address the same as that configured on the
PEL-3000.
5. Double click the Instrument 0 icon.
23
4
5
6. Click on Communicate with Instrument.
7. In the NI-488.2 Communicator window, ensure
*IND? is written in the Send String: text box.
Click on the Query button to send the *IDN?
query to the instrument.
8. The String Received text box will display the
query return:
GW, PEL-3XXX,EXXXXXXX,VX.XX.XXX
(manufacturer, model, serial number, version)

INTERFACE OVERVIEW
15
6
7
8
9. The function check is complete.

PEL-3000 Programming Manual
16
COMMNAND OVERVIEW
The Command overview chapter lists all PEL-3000 commands in
functional order as well as alphabetical order. The command syntax
section shows you the basic syntax rules you have to apply when
using commands.
Command Syntax
Compatible
Standard
IEEE488.2
Partial compatibility
SCPI, 1999
Partial compatibility
Command
Structure
SCPI (Standard Commands for Programmable
Instruments) commands follow a tree-like
structure, organized into nodes. Each level of
the command tree is a node. Each keyword in a
SCPI command represents each node in the
command tree. Each keyword (node) of a SCPI
command is separated by a colon (:).
For example, the diagram below shows an SCPI
sub-structure and a command example.
:RESPonse:CRANGe :VRANGe
[:MODE]:CRANGe
:MODE

COMMNAND OVERVIEW
17
Command types
There are a number of different instrument
commands and queries. A command sends
instructions or data to the unit and a query
receives data or status information from the
unit.
Command types
Simple
A single command
with/without a parameter
Example
:CONFigure:RESPonse MAX
Query
A query is a simple or
compound command
followed by a question mark
(?). A parameter (data) is
returned.
Example
:CONFigure:RESPonse?
Compound
Two or more commands on
the same command line.
Compound commands are
separated with either a semi-
colon (;) or a semi-colon and a
colon (;:).
A semi-colon is used to join
two related commands, with
the caveat that the last
command must begin at the
last node of the first
command.
A semi-colon and colon are
used to combine two
commands from different

PEL-3000 Programming Manual
18
nodes.
Example
CONFigure:VON
MAX;:CONFigure:VDELay
MIN
Command Forms
Commands and queries have two different
forms, long and short. The command syntax is
written with the short form of the command in
capitals and the remainder (long form) in lower
case.
The commands can be written in capitals or
lower-case, just so long as the short or long
forms are complete. An incomplete command
will not be recognized.
Below are examples of correctly written
commands.
Long
form
:CURRent:LEVel?
:CURRENT:LEVEL?
:current:level?
Short
form
:CURR:LEV?
:curr:lev?
Square Brackets
Commands that contain square brackets
indicate that the contents are optional. The
function of the command is the same with or
without the square bracketed items, as shown
below
For example for the query:
“[:CONFigure]:GNG [:PASS]?”
Both “:CONFigure:GNG:PASS?” and “:GNG?”
are both valid forms.