
LV-67S User’s Manual
-18-
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 JP1
COM2
: RS232/422/485 DB9 connector
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 JP2
Use JCSEL1 and JCSEL2 to select communication mode
COM3/4
: COM 20-pin header (Pitch 2.54 x 1.27mm)
Pin
Signal
Pin
Signal
1
DCD1
2
RXD1
3
TXD1
4
DTR1
5
GND
6
DSR1
7
RTS1
8
CTS1
9
RI1
10
NC
11
DCD2
12
RXD2
13
TXD2
14
DTR2
15
GND
16
DSR2
17
RTS2
18
CTS2
19
RI2
20
Key
COM5/6
: COM 20-pin header (Pitch 2.54 x 1.27mm)
Pin
Signal
Pin
Signal
1
DCD1
2
RXD1
3
TXD1
4
DTR1
5
GND
6
DSR1
7
RTS1
8
CTS1
9
RI1
10
NC
11
DCD2
12
RXD2
13
TXD2
14
DTR2
15
GND
16
DSR2