TH2689/89A Operation manual
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Chapter 5 Remote Control
TH2689 has the RS232C serial interface and the parallel GPIB (optional) interface. Both interfaces
can be used to remotely control TH2689, but they can not be used at the same time. The two
interfaces share the same program commands, but they have different hardware configurations and
different communication protocols. This chapter provides the information about the two interfaces
and how to use the interfaces.
5.1 RS232C Interface Introduction
The RS232C interface can be used to remotely control the TH2689, and all operations from the
front panel can be performed by a computer via the serial interface.
5.1.1 RS232C connection
RS232C Standard now is widely used as the serial communication standard. RS232 stands for
Recommend Standard number 232 and C is the latest revision of the standard. The serial ports on
most instruments use a subset of the RS-232C standard. The full RS-232C standard specifies a
25-pin "D" connector of which 22 pins are used. Most of these pins are not needed for normal serial
communications, and the common RS232 signals are listed as follows.