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GPIB Address
The electronic load operates from a GPIB address that is set from the front panel. To set the GPIB
address, press Shift + ⑦ (System menu) on the front panel and enter the address using the Entry keys.
The address can be set from 0 to 30. The GPIB address is stored in non-volatile memory.
1.2 RS-232 Capabilities of the Electronic Load
Use a cable with two serial interfaces (DB9) to connect the electronic load and PC. It can be activated
by selecting <RS-232> in <Communication> of the System menu (Shift + 8 on the front panel). NOTE:
There are two serial interfaces on the rear panel: the top 9-pin COM (female) interface is the RS-232
communication interface and the bottom 9-pin COM (male) serial port connection is not for use. All
SCPI commands are available through RS-232 programming. The EIA RS-232 standard defines the
interconnections between data terminal equipment (DTE) and data communications equipment (DCE).
The electronic load is designed to be a DTE and can be connected to another DTE such as a PC COM
port through a null modem cable.
NOTE: The RS-
232 settings in your program must match the settings specified in the front panel System
menu. Press Shift + 8 on the front panel to enter the System menu if you need to change the settings.
You can break data transmissions by sending a ^C or ^X character string to the electronic load. This
clears any pending operation and discards any pending output.
RS-232 Data Format
The RS-232 data is a 10-bit word with one start bit and one stop bit.
The number of start and stop bits are not programmable. However, the following parameters are
selectable in the System menu using the front panel Shift + 8 key.
Baud Rate
The System menu (Shift + 8) lets you select one of the following baud rates, which are stored in non-
volatile memory: 4800, 9600, 19200, 38400, 57600, or 115200.
Parity=None Start Bit 8 Data Bits Stop Bit
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