
18 System Description
Matrix MXE-3000 Series
User’s Manual
2.3.2 COM Ports
The MXE-3000 provides 4x 9-pin male dub ports on the rear
panel. The MXE-3000 COM1 and COM2 provide different modes
of serial communication and are RS-232/RS-422/RS-485, which
can be set in BIOS. Please refer to Section 4.1 for detail. COM3
and COM4 only provide RS-232.
Table 2-6: D-sub 9P signals of COM1 & COM2 ports
Table 2-7: D-sub 9P signals of COM3 & COM4 ports
PIN
Signal name
RS-232 RS-422 RS-485
1 DCD# RXD422n 485n
2 RXD RXD422p 485p
3 TXD TXD422p
4 DTR# TXD422n
5GND
6DSR#
7RTS#
8CTS#
9RI#
PIN Signal name
1 DCD
2RXD
3TXD
4DTR
5GND
6DSR
7RTS
8CTS
9RI
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