Remote Control
Copyright © Itech Electronic Co., Ltd. 3
XON/XOFF When the input queue of the the electronic load becomes more
than 3/4 full, the instrument issues an X_OFF command. The control program
should respond to this and stop sending characters until The electronic load
issues the X_ON, which it will do once its input buffer has dropped below
half-full. The electronic load recognizes X_ON and X_OFF sent from the
controller. An X_OFF will cause the electronic load to stop outputting characters
until it sees an X_ON.
NONE There is no flow control.
Flow control options are stored in non-volatile memory.
RS-232 connections
The RS-232 serial port can be connected to the serial port of a controller (i.e.,
personal computer) using a straight through RS-232 cable terminated with
DB-9 connectors. Do not use a null modem cable. and table below shows the
pinout for the connector.
If your computer uses a DB-25 connector for the RS-232 interface, you will
need a cable or adapter with a DB-25 connector on one end and a DB-9
connector on the other, wired straight through (not null modem).
RS-232 connector pinout
pin
number
description
1 no connection
2 TXD, transmit data
3 RXD, receive data
4 no connection
5 GND, signal ground
6 no connection
7 CTS, clear to send
8 RTS, ready to send
9 no connection
RS-232 troubleshooting
If you are having trouble communicating over the RS-232 interface, check the
following:
The computer and the electronic load must be configured for the same
baud rate, parity, number of data bits, and flow control options. Note that
the electronic load is configured for 1 start bit and 1stop bit (these values
are fixed).
The correct interface cables or adapters must be used, as described under
RS-232 connector. Note that even if the cable has the proper connectors
for your system, the internal wiring may be incorrect.
The interface cable must be connected to the correct serial port on your
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