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COM2 (Serial) Port/ Isolated 4-bit DIO
This DB-9 port can be used as an RS232/422/485 COM port or as an isolated 4-bit DIO. Refer
to the jumper setting in this section for its respective configuration.
COM2 (Serial) Port
The serial port is an asynchronous communication ports with 16C550A-compatible UARTs that
can be used with modems, serial printers, remote display terminals, and other serial devices.
Isolated 4-bit DIO (2-bit in and 2-bit out)
The isolated 4-bit Digital I/O connector provides powering-on function to external devices that
are connected to these connectors.
Chapter 5 Ports and Connectors
Chapter 5
RS232/422/485 COM2
or Isolated 4-bit DIO
Pins
1
2
3
4
5
6
7
8
9
24
COM 2
1 2 3 4 5
1 2 3 4 5
7
8 9
7
8 9
6
6
RS232
RS422
Full Duplex
COM2 Function
RS232
RS422
RS485
DCD
RX+
DATA+
RX
RX-
DATA-
TX
TX+
NC
DTR
TX-
NC
GND
GND
GND
DSR
NC
NC
RTS
NC
NC
CTS
NC
NC
RI
NC
NC
1 2 3 4 5
7
8 9
6
RS485
DIO Function
DIN0A
DIN0B
DIN1A
DIN1B
GND
DOUT0A
DOUT0B
DOUT1A
DOUT1B
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