User`s manual

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