ITech IT8700 Series User Manual

Remote operation
Copyright © Itech Electronic Co., Ltd. 78
⚫ 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.
⚫ When the input queue of the electronic load becomes more than 3/4full, the
instrument will send 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’s 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. The table below shows the
pinout for the connector.
If your computer uses a DB-25connector for the RS-232interface, 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
computer (COM1, COM2.etc.).
Communication setting
Before communication operation, please make sure that the following
parameters of electronic load match that of PC.
⚫ Baud rate ：9600(4800、9600、19200、38400、57600、115200). You can
enter system menu through panel to set communication baud rate.

ITech IT8700 Series Specifications

General

Brand	ITech
Model	IT8700 Series
Category	Test Equipment
Language	English