SoM-250ES_User_Manual_v1.40.doc
-13-
Rev 1.4 © 2014 EMAC, Inc.
4.10
COMA RS-232 Serial Port (CN2)
Pin
DB9 Signal
1
DCD
2
RxD
3
TxD
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
RI
4.11
COMB RS-232 Serial Port (HDR3)
Pin
HD3 Signal
DB9 Signal
1
NC
NC
2
NC
RxD
3
RxD
TxD
4
NC
NC
5
TxD
GND
6
NC
NC
7
NC
NC
8
NC
NC
9
GND
NC
10
NC
--
4.12
COMC RS-232/422/485 Serial Port (HDR4)
Pin
HD4 Signal
DB9 Signal
1
422/485 TX-
422/485 TX-
2
NC
232 RX, 422/485 TX+
3
232 RX, 422/485 TX+ 232 TX, 422/485 RX+
4
RTS
422/485 RX-
5
232 TX, 422/485 RX+ GND
6
CTS
NC
7
422/485 RX-
RTS
8
NC
CTS
9
GND
NC
10
NC
-
4.13
COMD RS-232 Serial Port (HDR2)
Pin
HD2 Signal
DB9 Signal
1
NC
NC
2
NC
RxD
3
RxD
TxD
4
NC
NC
5
TxD
GND
6
NC
NC
7
NC
NC
8
NC
NC
9
GND
NC
10
NC
--
