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7
–
–
8
–
–
9
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Female DB25 (OPT8A+/S+)
Pin RS-232 RS-422/
RS-485-4W
RS-485-2W
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
–
–
DB25 female
