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What does a NMEA multiplexer do?

Cx5106 Multifunction Nmea2000 Signal Converter


An NMEA 0183 multiplexer (sometimes called a combiner) collects NMEA 0183 data from multiple talker devices and then combines them serially so that they can be output to other listener NMEA 0183 devices over a single connection. Typically, the input (listener) side of a multiplexer is optically isolated from the output (microphone) side of the multiplexer. This is done according to the NMEA 0183 specification and is designed to help prevent ground loops from forming between the speaker and listener.



Some multiplexers are very simple and only collect and pass data. Other NMEA 0183 multiplexers can perform more complex data processing such as port prioritization, sentence filtering, Bluetooth or WiFi broadcasting, SeaTalk to NMEA conversion, network adaptation and other complex functions.



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