Maretron J2K100, User Manual, Page: 31 / 31

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Revision 1.1 Appendix B – Application Note Page B11
This configuration requires two additional drops or stubs from the J1939 trunk or backbone to
the Maretron J2K100s. You should follow the engine/genset manufacturer’s instructions for
adding the drop, which are generally specified to be 1 meter or less in length.
For illustration purposes, the J1939 network in Figure 8 shows the J2K100 drops or stubs (i.e.,
connection between J1939 network and Maretron J2K100s) as a two wire or twisted pair cable.
The network wiring actually requires three wires: two CAN bus signals (usually designated
CAN-H and CAN-L, usually yellow and green respectively), and a ground used as a reference
(usually designated as CAN-SHLD). Refer to SAE J1939-11 and J1939-15 for recommended
practices in connecting CAN-H, CAN-L, and CAN-SHLD.
After completing the physical connections, you will need to configure the J2K100’s so they
respond to the appropriate J1939 engines/gensets. Most dual engine installs have the port
engine J1939 address set to 0 and the starboard engine J1939 address set to 1, but not
always, so check with the engine manufacturer and use a Maretron NMEA 2000
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display
(DSM200/DSM250) to program the J2K100s with the corresponding J1939 address. On the
NMEA 2000
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side, most dual engine displays are looking for the NMEA 2000
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instance to be
set to 0 for the port engine and the NMEA 2000 instance set to 1 for the starboard engine.
Again, you can use a Maretron display to program the appropriate NMEA 2000
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instances.
Refer to the
J2K100 User’s Manual
(Section 2.5) for a description of configuring a J2K100.