Table C-18: Com2 Port For Rs-232, Rs-422 And Rs-485 (Cn22) - Advantech PCM-9576F User Manual

Note1 : The cable of serial port (CN22) comes with four DSUB-9
male connectors. The pin assignments of each DSUB-9
connector are listed below for your reference:
Note2 : PCM-9576 standard configuration is 2 RS-232 ports
(CN22 is pin1-p20).
1 additional RS/232/422/485 and 1 RS-232 port, CN22 is
pin1-pin40 (optional).

Table C-18: COM2 port for RS-232, RS-422 and RS-485 (CN22)

Pin Signal
RS-232
11 DCD2
13 RxD2
15 TxD2
17 DTR2
19 GND
12 DSR2
14 RTS2
16 CTS2
18 RI2
19 DDC/SDA (reserved)
RS-422
TX-
TX+
RX+
RX-
GND
DSR2 (not used)
RTS2 (not used)
CTS2 (not used)
RI2 (not used)
20
Appendix C Pin Assignments
RS-485
DATA-
DATA+
NC
NC
GND
DSR2 (not used)
DSR2 (not used)
DSR2 (not used)
DSR2 (not used)
DDC/SCL (reserved)
8 7