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
6 7 8 9
1 2 3 4 5
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 # )
6 7 8 9
1 2 3 4 5
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
