Chapter 6: Connector Pin Assignments
The popular 9-pin D subminiature connector is used for interfacing to communication lines. The
connector is equipped with 4-40 threaded standoffs (female screw lock) to provide strain relief.
Pin No.
RS232 Functions
RS422/485 Functions
1
DCD Data Carrier Detect (Input)
Rx- Receive Data
2
RD Receive Data (input)
Tx+ Transmit Data
3
TD Transmit Data (output)
Tx- Transmit Data
4
DTR Data Terminal Ready (output)
5
Gnd Signal Ground
GND Ground
6
DSR Data Set Ready (input)
7
RTS Request to Send (output)
8
CTS Clear to Send (input)
9
RI Ring Indicator (input)
Rx+ Receive Data
Table 6-1:
Connector Pin Assignments
Note
If connections are to be made to a CE-marked version, then CE-certifiable cabling and breakout
methodology (Cable shields connected to ground at the mounting bracket shielded twisted-pair
wiring, etc) must be used.
Manual PCI-COM-2S
19
