User guide

24 Hardware Information

COM1/2 Connectors (DB-9)

COM1 RS-232/422/485 Mode Select (J3)

Pin # RS-232 RS-422* RS-485*

1 DCD-L TX- RTX-

2RXD TX+ RTX+

3TXD RX+ N/A

4DTR-L RX- N/A

5GND

6DSR-L N/A

7RTS-L N/A

8CTS-L N/A

9RI-L N/A

NOTE:

*RS-422/485 signals supported on COM1 only. See COM1

Mode jumper settings below and 3.3 Board Layout on p. 26 for

J3 location.

Pins RS-232 RS-422 RS-485

1-2 Open Shorted Shorted

3-4 Open Shorted Open

5-6 Open Open Shorted