Revision 1.1 Appendix B – Application Note Page B9
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.
The diagram in Figure 7 requires that the J1939 engines/gensets have unique J1939
addresses, otherwise the J2K100s won’t be able to distinguish which messages or PGNs are
from which engine. Check with the engine manufacturer to be sure that the J1939 interfaces
on the engines/gensets have been set to different addresses. If the engines/gensets have the
same address and the engine manufacturer is unable program unique addresses, you will
need to build two separate J1939 networks similar to the diagram shown in Figure 9.
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
®
display
(DSM200/DSM250) to program the J2K100s with the corresponding J1939 address. On the
NMEA 2000
®
side, most dual engine displays are looking for the NMEA 2000
®
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
®
instances.
Refer to the J2K100 User’s Manual (Section 2.5) for a description of configuring a J2K100.
4.4 Two Engines/Gensets, Single J1939 Network Installation
Figure 8 shows a two engines/gensets, single J1939 network installation diagram.
Figure 8 – Two Engines/Gensets, Single J1939 Network Installation Diagram
J1939
Display
J1939 Port
Engine or
Genset
Installed
Termination
Resistor
Installed
Termination
Resistor
Maretron J1939 to
NMEA 2000
®
Gateway (J2K100)
Maretron Micro Female Field
Attachable Connector Included
with J2K100 (M8A5000-32DN)
User Supplied Cable/Connector
Compatible with Engine/Genset
Manufacture Cabling System
NMEA 2000
Network
J1939 Network
Maretron J1939 to
NMEA 2000
®
Gateway (J2K100)
J1939 Starboard
Engine or
Genset
Maretron Micro Female Field
Attachable Connector Included
with J2K100 (M8A5000-32DN)
(23 paginas)
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