Basically, it's the same signal arrangement used with the CAN bus when found on a circular connector.
However, the [CAN_] signals are now called [NET-] net signals.
The power signals are twisted together [red/black], as is the signal pair [blue/white].
5-Pin Micro/Mini NMEA2000 Signal Assignments:
Pin 1 Shield Cable Shield Bare drain wire
Pin 2 NET-S +12v Device power Red wire
Pin 3 NET-C Device Ground Black wire
Pin 4 NET-H Dominant high signal White wire
Pin 5 NET-L Dominant low signal Blue wire
