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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 --- ---