Serial Communications - Peavey MediaMatrix Nion Hardware Manual

Appendix B - Connector ports
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Serial communications

NION supports serial communications via two female DB-9 connectors on the rear of the unit.
The first connector supports RS-232 and the second supports both RS-422 full duplex and
RS-485 half-duplex.
Follow the pinout drawings and charts below for terminating the different protocols.
Note: Only one protocol can be used on a particular port at any one time.
RS-232 serial port
Pin Function
1 Not used
2 TX data
3 RX data
4 Not used
5 Ground
6 Not used
7 CTS
8 RTS
9 Not used
Notes:

Transmit (TX) and Receive (RX) are from the point of view of the MediaMatrix device.
Connect them to the opposite port of the remote unit.

Pins 7 and 8 are not required for normal operation.
80 Version 1.6.4b.1 June 11, 2012