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Chapter 5 Remote Operation
Besides the front panel control, TH1942 supports RS-232 serial interface for remote control. Standard
Commands for Programmable Instruments (SCPI) is fully supported to communicated with computer by
the RS-232 interfaces, with a certain communication protocols.
5.1.1 RS-232
You can connect RS-232 interface with a computer. Some considerations will draw your attention:
You must define the baud rate
You must use the SCPI programming language
5.2 RS-232 Interface Operation
The instrument provides various remote commands. All operations from the front panel can be
performed by a computer via the RS-232 interface.
5.2.1 RS-232 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 RS232C standard. The full RS232C 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 in Table 5-1:
Function
Code
9 Pin Connector
Pin Number
Request To Send
RTS
7
Clear To Send
CTS
8
Data Set Ready
DSR
6
Data Carrier Detect
DCD
1
Data Terminal Ready
DTR
4
Transmitted Data
TXD
3
Received Data
RXD
2
Signal Ground Common
GND
5
Table 5-1 Signal Definition for 9 Pin Connector
