PCI Express Boards
Pin Assignments
7-11
2-wire RS-485
Pin
Signal
Pin
Signal
Pin
Signal
1
Data3+(B)
16
–
31
–
2
–
17
Data3-(A)
32
–
3
–
18
–
33
GND3
4
–
19
–
34
–
5
Data2+(B)
20
–
35
–
6
–
21
Data2-(A)
36
–
7
–
22
–
37
GND2
8
–
23
–
38
–
9
Data1+(B)
24
–
39
–
10
–
25
Data1-(A)
40
–
11
–
26
–
41
GND1
12
–
27
–
42
–
13
Data0+(B)
28
–
43
–
14
–
29
Data0-(A)
44
GND0
15
–
30
–
Device Side Pin Assignments
Male DB9 (CBL-M44M9x4-50)
Pin
RS-232
RS-422/RS-485-4W
RS-485-2W
1
DCD
TxD-(A)
–
2
RxD
TxD+(B)
–
3
TxD
RxD+(B)
Data+(B)
4
DTR
RxD-(A)
Data-(A)
5
GND
GND
GND
6
DSR
–
–
7
RTS
–
–
8
CTS
–
–
9
–
–
–
Male DB25 (CBL-M44M25x4-50)
Pin
RS-232
RS-422/RS-485-4W
RS-485-2W
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)
22
–
–
–
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