Chapter 2
20
PPC-1850/2150 Series User’s Manual
COM ports
COM ports with the pin definitions.
COM1~COM2 RS-232 / 422 / 485 Port DB-9
Pin
RS-232
RS-422
Half Duplex
RS-485
Full Duplex
RS-485
1 DCD
TX- DATA- TX-
2 RXD RX+
N/A RX+
3 TXD TX+ DATA+ TX+
4 DTR RX- N/A RX-
5 GND GND
GND
GND
6 DSR N/A N/A N/A
7 RTS N/A N/A N/A
8 CTS N/A N/A N/A
9 +5V
+5V +5V +5V
Figure 7 COM ports
COM1 COM2