NDC-4-ASW NMEA Data Multiplexer Autoswitch
Up to five OPTO isolated NMEA 0183 sources can be combined into a single stream*.
Two flexible ISO-Drive outputs allow two different baud rates to be created.
* 4 inputs on the USB version as the USB interface acts as the 5th OPTO input.
Actisense ref: NDC-4-ASW