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STB6684/A Operation Manual
Chapter 8 Remote Control
Besides the front panel control, STB6684/STB6684A supports RS232C serial interface (standard)
and GPIB parallel interface (optional) for remote control. User can use only one interface at a
time. Standard Commands for Programmable Instrument (SCPI) is fully supported by the
RS-232 and GPIB interfaces, however they use different hardware configurations and
communcitoan protocols. The operation method is dealt with in this chapter, the use for interface
commands, in chapter 9
8.1 RS232C interface operation
The instrument provides abundant commands for remote control, thus through the
RS232C interface a computer can achieve all operations on the front panel.
8.1.1 RS232C connection
RS-232 standard, also called as asynchronous serial communication standard, has already
been widely used for data communication between computers, computer and external equipment.
RS is the English abbreviation of Recommended Standard; 232, the standard number. This
standard is issued by EIA in 1969, which rules to send one bit in a data line every time.
Configurations of most serial interfaces are not strictly based on RS-232 standard. A 25
pin connector is used on each terminal (IMBAT uses a 9 pin connector). The most frequenctly
used RS-232 signals are as follows:
Signal
Request to send
Clear to send
Data set ready
Data carrier detect
Data terminal ready
Transimitted data
Received data
Signal ground
common
As most serial interfaces worldwide, the serial interface of STB6684/STB6684A is also not
strictly based on RS-232 standard but only uses the smallest subset of this standard. The signals
are listed in the following table.
Table 7-1 RS-232 signals
Code
Pin number of 25-pin
connector
RTS
4
CTS
5
DSR
6
DCD
8
DTR
20
TXD
2
RXD
3
GND
7
◇ 89
Chapter 8 Remote Control
Pin number of 9-pin
connector
7
8
6
1
4
3
2
5
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