Motherboard Information
SI-61S User Manual
17
2
2.5.1
COM1 and COM2 Serial Ports (CN1)
COM1:
COM2:
COM1
RS-232/422/485 port:
Pin
Signal Name
RS-232
RS-422
RS-485
1
DCD
TX-
DATA-
2
RX
TX+
DATA+
3
TX
RX+
NC
4
DTR
RX-
NC
5
Ground
Ground
Ground
6
DSR
NC
NC
7
RTS
NC
NC
8
CTS
NC
NC
9
RI
NC
NC
COM2
RS-232 port:
Pin
Signal Name
Pin
Signal Name
1
DCD, Data carrier detect
6
DSR, Data set ready
2
RXD, Receive data
7
RTS, Request to send
3
TXD, Transmit data
8
CTS, Clear to send
4
DTR, Data terminal
ready
9
RI, Ring indicator
5
Ground
1
6
5
9
1
6
5
9
