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STB6684/A Operation Manual
Signal ground common
The reason is that the use of three lines is much more inexpensive and much simpler than that of
five lines or six lines, which is the biggest advantage of using serial interface for communication.
Note: The definition for serial interface pin used by the instrument is different from that of
standard 9 pin connector.
RS232C used on this instrument applies 9-pin DB socket, and the sequence of pin is as follows:
Use standard 9-pin DB plug to connect the connector.
Warning: Before connecting or disconnecting the connector, please power off the
!
instrument to avoid electrical shock hazard.
Warning: Do not short the output terminal or case so as to avoid damage to the DUT.
!
8.1.2 Communicating with PC
The connection of the instrument with PC is shown in figure 7-1-2:
Table 7-2 RS-232 signal and pin number
Signal
Transmitted data
Received data
5
4
3
2
1
9
8
7
6
Figure 7-1-1 Serial interface connector
Figure 7-1-2 Connection of the instrument with PC
◇ 90
Chapter 8 Remote Control
Code
Connetor pin
number
TXD
3
RXD
2
GND
5
（side view）
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