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Chapter 3: Motherboard Connections
COM Ports
Four Serial COM ports are located on the rear I/O plate. COM1/COM2 supports RS-232/
RS-422/RS-485 ports, and COM3/COM4 supports only a RS-232 port.
RS-232 D-SUB Connector
Pin Definitions
Pin#
Definition
Pin#
Definition
1
DCD
2
RXD
3
TXD
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
RI
RS-422 D-SUB Connector
Pin Definitions
Pin#
Definition
Pin#
Definition
1
TX-
2
TX+
3
RX+
4
RX-
5
GND
6
N/A
7
N/A
8
N/A
9
N/A
RS-485 D-SUB Connector
Pin Definitions
Pin#
Definition
Pin#
Definition
1
DATA-
2
DATA+
3
N/A
4
N/A
5
GND
6
N/A
7
N/A
8
N/A
9
N/A