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User manual Version 1.0
Modbus Gateway
Serial Port Pin Definitions
2-Port and 4-Port Pin Definitions (DB9)
RS-232
Pin
Signal
1
DCD
2
RXD
3
TXD
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
NC
RS-422
Pin
Signal
1
NC
2
TXDB (+)
3
RXDB(+)
4
NC
5
GND
6
NC
7
RXDA (-)
8
TXDA (-)
9
NC
RS-485
Pin
Signal
1
NC
2
NC
3
DataB (+)
4
NC
5
GND
6
NC
7
DataA (-)
8
NC
9
NC
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