18
IB981
User’s Manual
2.5.1
COM1 & COM2 Serial Port (J1)
1
2
19
20
COM1
(pin1 ~ pin10) supports RS-232/422/485.
COM2
(pin11 ~ pin20) supports RS-232 only.
Pin
Assignment
Pin
Assignment
1
DCD1
2
DSR1
3
RXD1
4
RTS1
5
TXD1
6
CTS1
7
DTR1
8
RI1
9
Ground
10
NC
11
DCD2
12
DSR2
13
RXD2
14
RTS2
15
TXD2
16
CTS2
17
DTR2
18
RI2
19
Ground
20
NC
Pin
Assignment
RS-232
RS-422
RS-485
1
DCD
TX-
DATA-
3
RX
TX+
DATA+
5
TX
RX+
NC
7
DTR
RX-
NC
9
Ground
Ground
Ground
2
DSR
NC
NC
4
RTS
NC
NC
6
CTS
NC
NC
8
RI
NC
NC
10
NC
NC
NC