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Operation
The TW is controlled through the GPIB interface using the SCPI compatible command
language. The RS-232 interface at the rear panel interprets the exact same syntax as
the GPIB interface. The RS-232 communication parameters are fixed at:
• 9600 baud
• Parity NONE
• Data bits 8
• Stop bits 1.
Any command sent to the GPIB interface will be answered to the GPIB. Any command
sent through the RS-232 interface will be answered back to the RS-232 interface.
Concurrent attachment to both GPIB and RS-232 is not supported.
The factory set GPIB address is 25.
3 .3
OVE R VI E W OF T W F R ONT PANE L OP E R AT I ONS
The displays typically show the volts, frequency, and current read back from the output
lines. The program parameters are adjusted by pressing one of three program keys,
then either entering a number or using the arrow keys to ramp a given parameter up or
down in variable step sizes. For instance, you can step the voltage in units of 100's,
10's, 1's, or tenths of a volt using the arrow keys. The longer the arrow is held, the
faster the specified value increases or decreases. To quickly source voltage to the TW
output terminals: set phase A current limit and set phase A voltage to a given value by
entering these values on the keypad, press the Output key to source to the load on A
phase and then rapidly scan the voltage to the load up or down with the arrow keys if
desired.
3 .4
DI S P L AY I NG R E ADB ACK S
When initially powered up, the TW display shows the present output voltage on the left,
the present frequency in the center, and the present current being sourced on the right-
most position. The display responds to several readback keys:
• A : B : C key
• Hz : Phase A-B : Phase A-C key
• I : W : VA : PF : CF key
When the A LED is lit, phase A readbacks appear on the display. Press the ABC key
repeatedly to cycle through each of the phases on the display.
3-2
TW 3700 • TW 5550
Elgar TrueWave
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