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3.2
External COM Port Pin Definition
COM 1 and COM 2 (RS232, pin 9 supports 5 V/12 V output)
COM 3 RS-422/485
COM 1-2:
PIN
1
2
3
4
5
6
7
8
9
Pin 9 is set as RI signal in COM port by default, and could be set as 5V/12V output
by Jumper
Figure 3.2 COM ports
COM1/COM2
DCD
RXD
TXD
DTR
GND
DSR
RTS
CTS
RING or 5V/12V output
27
COM1~2
COM3
PPC-3211W User Manual
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