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Pin Assignments and Cable Wiring
RS-232/422/485 (Male DB9) Pinouts
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
–
–
–
4W/2W RS-485/RS-422 (Terminal Block) Pinouts
PIN
RS-485 (2W)
RS-422/
RS-485 (4W)
1
–
TxD+(B)
2
–
TxD-(A)
3
Data+(B)
RxD+(B)
4
Data-(A)
RxD-(A)
5
–
GND
Four cables are available as optional accessories that can be used to
connect the NPort IA to RS-232 serial devices. For your convenience, we
show precise cable wiring diagrams for each of the two cables.
Female DB9 to Male DB9
