
12
Board Layout
Chapter 3
Embedded and Industrial Computing
J10, SC2T1: Select COM1 Protocol Setting
RS-232
RS-422
RS-485
Switch
Protocol
J10 SC2T1
RS-232 (default) 1-2, 1-5, 2-6, 3-7, 4-8
RS-422 3-4, 5-6 5-9, 6-10, 7-11, 8-12
RS-485 3-4, 7-8 5-9, 6-10
J14, SC2T2: Select COM2 Protocol Setting
RS-232
Jumper Settings
COM1 RS-232/422/485 Serial Port (CN3): It is a RS-
232/422/485 port through the D-SUB9 connector.
COM2 RS-232/422/485 Serial Port(CN4): It is a RS-
232/422/485 port through the D-SUB9 connector.
J10
1
2
6789
12345
Pin No. Pin Name
RS-232 RS-422 RS-485
1 Data Carrier Detect
(DCDA # )
TXD- DATA-
2 Receive Data
(RXDA )
TXD+ DATA+
3 Transmit Data
(TXDA )
RXD+
4 Data Terminal Ready
(DTRA # )
RXD-
5 Ground
(GND )
6 Data Set Ready
(DSRA # )
7 Request To Send
(RTSA # )
8 Clear To Send
(CTSA # )
9 Ring Indicator
(RIA # )
6789
12345
Pin No. Pin Name
RS-232 RS-422 RS-485
1 Data Carrier Detect
(DCDA # )
TXD- DATA-
2 Receive Data
(RXDA )
TXD+ DATA+
3 Transmit Data
(TXDA )
RXD+
4 Data Terminal Ready
(DTRA # )
RXD-
5 Ground
(GND )
6 Data Set Ready
(DSRA # )
7 Request To Send
(RTSA # )
8 Clear To Send
(CTSA # )
9 Ring Indicator
(RIA # )
7
8
SC2T1
4
8
12
1
5
9
1
2
7
8
J14
SC2T2
4
8
12
1
5
9
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