The NM-431MP is a multiport IO interface featuring four optically isolated input ports, three RS-422 signal level output ports, one RS-232 signal level IO port (share with input 1) and a Serial over Ethernet IO port.

The NM-431MP interface is intended for use with computer based marine systems such as ECDIS, SVDR/VDR and Conning systems where NMEA-0183 data must be acquired from multiple sources such as GPS, Gyro, Log, AIS, Radar ARPA, Echo Sounder, Wind Instrument and BNWAS.

The connection to the computers is achieved via the Serial over Ethernet Interface with the use of a single CAT5 cable, either by creating four virtual serial ports or directly to four user selectable UDP sockets for application supporting this feature.