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Chapter 5 Remote Control
TH2816B has the RS232C serial interface and the parallel GPIB (optional) interface.
Both interfaces can be used to remotely control TH2816B, 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. For the available commands, refer to Chapter 6 Command reference.
5.1 RS232C Interface Introduction
The RS232C interface can be used to remotely control the TH2816B, and it also can
be used to control the DC current bias sources manufactured by our company such
as TH1773/TH1775 DC current bias source. 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.
TH2816B only uses the smallest subset of the RS232C standard, the signal are listed
as follows.
Function Code 9 Pin Connector Pin Number
Transmitted Data TXD 3
Received Data RXD 2
Signal Ground Common GND 5
TH2816B’s RS232 interface may be different with the standard RS232C. The pin
configuration is shown as follows.
Function Code
25 Pin Connector
Pin Number
9 Pin Connector
Pin Number
Request To Send RTS 4 7
Clear To Send CTS 5 8
Data Set Ready DSR 6 6
Data Carrier Detect DCD 8 1
Data Terminal Ready DTR 20 4
Transmitted Data TXD 3 3
Received Data RXD 2 2
Signal Ground Common GND 7 5
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