Raymarine NMEA Multiplexer - Manual (Page 12)

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are made depends on whether the device has a differential or
single ended output, as follows:
Power supply
The NMEA Multiplexer operates from a dc supply voltage in the
range 8 V to 30 V and provides protection against reversed
polarity. It is recommended to connect the NMEA Multiplexer to
the same power source or circuit breaker as the ships instruments
and/or computer.
Protect the power supply with a 0.5 A fuse. The wires used to
connect the power supply must be less than 50 m in length and
have a total cross-sectional area of at least 0.2 mm
2 . The
following examples represent the minimum requirement:
Device with
differential NMEA input
NMEA in +
Device with
single-ended NMEA input
Ground
NMEA in +
NMEA in -
NMEA Multiplexer
NMEA Out a
NMEA Out b
Shld
Note: NMEA inputs on Raymarine products are differential.
D7586-1
Cable
shield
NMEA Multiplexer
NMEA Out a
NMEA Out Com
Shld
Cable
shield