User`s manual

18 System Description
Matrix MXE-1000 Series
User’s Manual
2.3.2 COM Ports
The MXE-1005/1010/1020 controller provides four COM ports on
the rear panel in the form of D-Sub 9P connectors. COM1 and
COM2 ports support RS-232/RS-422/RS-485 by jumper selection,
while COM3 and COM4 ports support RS-232 function only.
Please refer to section 3.2 for instructions on setting the RS-232/
422/485 functionality for COM1 and COM2 ports.
PIN
Signal Name
RS-232 RS-422 RS-485
1 DCD# TXD422- 485DATA-
2 RXD# TXD422+ 485DATA+
3 TXD# RXD422+
4 DTR# RXD422-
5GND
6DSR#
7RTS#
8CTS#
9RI#
Table 2-4: COM Signal Names