Multiplexing into Windows
Usually most efficient into USB, but can also simulate multiple serial ports
Each NMEA 0183 device plugs into a serial port on the multiplexer.
Specific device testing/manufacturer
specifications are required to know how to wire the NMEA 0183 device
and whether to bring its serial electrical output as RS-232, RS-423, or RS-422
Multiplexers vary in electrical interface and number of ports, such as
What if something breaks?
It may be possible to program computer applications to recognize a primary and secondary device.