15
Pins in the serial port(COM1~COM4)
6 7 8 9
1 2 3 4 5
Pin NO.
Definition(RS-232 mode)
Definition(RS-422/RS-485 mode)
1
DCD, data carrier detect
TX-, Transmit data ground (RS-422/RS-485)
2
RXD, Receive data
TX+, Transmit data(RS-422/RS-485)
3
TXD, Transmit data
RX+, Receive data (RS-422)
4
DTR, Data terminal ready
RX-, Receive data ground (RS-422)
5
GND, Signal ground
GND, Signal ground
6
DSR, Data set ready
N.C.
7
RTS, Request to send
N.C
8
CTS, Clear to send
N.C
9
Ring-IN, Ring indicator
N.C.
Note:
COM1~COM4 ports can be set to RS-232 mode(default), RS-422 mode or RS-485 Mode.
