4 <serial port interface – COMMELL LE-37E User Manual
Page 16
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LE-37E
User’s Manual
-15-
2.4.4 <Serial Port interface>
COM1: RS232 DB9 connector
Pin
Signal
Pin
Signal
1
DCD
2
RXD
3
TXD
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
Set by JP2
10
Key
CN_COM2: RS232/422/485 10-pin header (Pitch 1.27mm x 2.54mm)
Pin
Signal
Pin
Signal
1
DCD/ 422TX-/ 485-
2
RXD/ 422TX+/ 485+
3
TXD/ 422RX+
4
DTR/ 422RX-
5
GND
6
DSR
7
RTS
8
CTS
9
Set by JP1
10
Key
Use JCSEL1 and JCSEL2 to select communication mode
CN_COM2
1
2
9
10
CN_COM3/4
CN_COM5/6
1
2
19
20
1
2
20
19
2
1
6
5
JP1
JP2
2
6
1
5
JCSEL1
1
2
11
12
JCSEL2
1
2
5
6
COM1
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