
Pinouts of the Terminal Block (RS-422 / RS-485)
PIN
RS-485 RS-422/ RS-485
2-wire 4-wire
1 --- TxD+(B)
2 --- TxD-(A)
3
1
2
3
4
5
Da B) ta+( RxD+(B)
4 Data-(A) RxD-(A)
5 GND GND
emale DB9 to Male DB9
emale DB9 to Male DB25
. Pull-high, Pull-low, and Terminator for RS-485
DIP
witches to adjust each serial port’s pull-high, pull-low, and terminator.
F
NPort IA
9 pins 9 pins
DCD
RxD
TxD
DTR
GND
DSR
RTS
CTS
RS-232
Device
DCD
TxD
RxD
DSR
GND
DTR
CTS
RTS
Cable Wiring
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Female DB9 Male DB9Male DB9 Female DB9
SE-
Converter
F
7
emove the Serial/Ethernet Converter’s top cover and you will findR
s
NPort IA
s 25 pins
DCD
RxD
TxD
DTR
GND
DSR
RTS
CTS
RS-232
Device
DCD
TxD
RxD
DSR
GND
DTR
CTS
RTS
Cable Wiring
1
2
3
4
5
6
7
8
8
3
2
20
7
6
4
5
Male DB25 Female DB25
Female DB9Male DB9
9 pin
SE-
Converter
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