Moxa Technologies CP-118EL - Manual (Page 59)

PCI Express Board User’s Manual Pin Assignments
5-4
Male DB25 (OPT8B+/C+)
1
14
13
25
Pin RS-232
RS-422 /
4-wire RS-485
2-wire RS-485
2 TxD RxD+(B) Data+(B)
3 RxD TxD+(B) ---
4 RTS --- ---
5 CTS --- ---
6 DSR --- ---
7 GND GND GND
8 DCD TxD-(A) ---
20 DTR RxD-(A) Data-(A)
Female DB25 (OPT8A+/S+)
13 1
25 14
Pin RS-232
RS-422 /
4-wire RS-485
2-wire RS-485
2 RxD TxD+(B) ---
3 TxD RxD+(B) Data+(B)
4 CTS --- ---
5 RTS --- ---
6 DTR RxD-(A) Data-(A)
7 GND GND GND
8 DCD TxD-(A) ---
20 DSR --- ---