M3 Mobile M3 POS User Manual page 37

Com Port has different pin out value, please read table below carefully to make sure
you have used right Com Port for your external device.
COM1
DSUB9 PIN
MALE
1
2
3
4
5
6
7
8
9
NAME
N.C
RXD
TXD
N.C
GND
N.C
N.C
N.C
N.C
M3 POS Cradle
37
COM2
DSUB9 PIN
MALE
1
2
3
4
5
6
7
8
9
NAME
N.C
RXD
TXD
N.C
GND
N.C
RTS
CTS
5V