CONNECTION TO THE N2K BUS

The N2K0183 multiplexer can be connected to a NMEA2000 (also referred to as N2K) backbone or to a Raymarine SeaTalkNG backbone. These 2 buses are electrically equivalent and only differ on the type of connectors. You need a cable with stripped wires at the end that connects to the N2K0183 screw terminals, as shown in the picture on the left. 

If you want to connect the N2K0183 multiplexer to a SeaTalkNG backbone you can get Raymarine parts numbers A06043 (1 meter stripped end spur cable) or A06044 (same but 3 meter). If you want to connect the N2K0183 multiplexer to a NMEA2000 backbone you have more options including making yourself the connecting cable using a 5 pin male M12 connector plug (you can get these plugs either with screw or soldering terminals). The plugs are shown on the right of the above picture. The N2K0183 multiplexer also has 2 input and 1 output Nmea0183 ports whose connections should be done as described here. When you connect the output port P2 of the N2K0183 multiplexer to an opto isolated Nmea0183 listener no loop ground around the N2K bus are created. However, if you connect P2 to a single ended input Nmea0183 listener you may not only destroy the multiplexer driver if you connect B2 to GND but also create a ground loop around the N2K bus. This problem is discussed here.

N2K to NMEA0183 to N2K CONVERSIONS

The following tables show the conversions carried out by the N2K0183 multiplexer between Nmea0183 sentences and N2K PGN messages. Further conversions maybe implemented in the future.

NMEA 0183 >	NMEA2000 PGN		NMEA2000 PGN >	NMEA 0183	Notes
APB	129283, 129284		127250	HDM,HDT,HDG	1
DIN	Nmea2000 transliterate		128259	VHW
DBT	128267		128267	DPT,DBK,DBT
DPT	128267		129026	VTG	2
DBK	128267		130306	MWV	5
GGA	127258,129029,129000		130311	MDA
GLL	126992, 129025		127245	RSA
HDG	127250		127258	(saved for RMC)
HDM	127250		129025	(saved for RMC)
HDT	127250		129029	(saved for RMC)
MTW	130211		(1Hz intervals)	RMC	3
MWV rel	130306		126992	ZDA
MWV true	130306		65359	HDT,HDM
RMB	129283,129284,129285		127237	HSC
RMC	127258, 129026, 129029		129283	XTE
VHW	130577 , 128259		129284	APB,RMB	4
VTG	129026		129285	RMB	4
XTE	129283		129038	AIS messages VDM/VDO
VDM/VDO	129038…(AIS messages)		129039
			129794
			129809
			129810

 

 Notes:

1 - Max update rate 2Hz,
2 - Max update rate 2Hz, Sent only if SOG is valid and recent
3 - 1Hz max, sent only if Latitude & Systemdate are valid and recent
4 - 1Hz max, sent only if Latitude valid and recent
5 - 1Hz max, sent only if WindAngle valid and recent