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Remote Control

1.1.2 RS-232 Capabilities of the Electronic Load

The electronic load provides an RS-232 programming interface, which is

activated by commands located under the front panel <Shift> + <System> key.

All SCPI commands are available through RS-232 programming. When the

RS-232 interface is selected, 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. It 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 the front panel <Shift> + <System> key

if you need to change the settings.You can break data transmissions by

sending a ^C or ^X character string to the multimeter. 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 is not programmable. However, the following

parity options are selectable using the front panel <Shift> + <System> key:

 EVEN Seven data bits with even parity

 ODD Seven data bits with odd parity

 NONE Eight data bits without parity

Parity options are stored in non-volatile memory.

Baud Rate

The front panel <Shift> + <System> key lets you select one of the following

baud rates, which is stored in non-volatile memory: 4800 9600 19200 38400

57600 115200

RS-232 Flow Control

The RS-232 interface supports the following flow control options that are

selected using the front panel <Shift> + <System> key. For each case, the

electronic load will send a maximum of five characters after hold-off is asserted

by the controller. The electronic load is capable of receiving as many as fifteen

additional characters after it asserts hold-off.

CTS/RTS The electronic load asserts its Request to Send (RTS) line to signal

hold-off when its input buffer is almost full, and it interprets its Clear to Send

(CTS) line as a hold-off signal from the controller.

ITech IT8700 Series Programming Guide

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