AAEON PCM-QM77 User Manual
Page 47
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C o m p a c t B o a r d
P C M - Q M 7 7
Chapter 2 Quick Installation Guide
2-32
2.34 COM Port 2 (CN15)
RX
DTR
DSR
CTS
NC
DCD
1
2
9
10
TX
GND
RTS
RI/+5V/+12V
RS-232
Pin
Pin Name
Signal Type
Signal Level
1 DCD
IN
2 RX
IN
3 TX OUT
±9V
4 DTR OUT ±9V
5 GND GND
6 DSR
IN
7 RTS OUT ±9V
8 CTS
IN
9 RI/+5V/+12V IN/
PWR
+5V/+12V
10 NC
RS485_D+
NC
NC
NC
NC
RS485_D-
1
2
9
10
NC
GND
NC
NC/+5V/+12V
RS-485
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