Revision 1.1 Appendix B – Application Note Page B7
J1939 address. On the NMEA 2000
®
side, most single engine displays are looking for the
NMEA 2000
®
instance to be set to 0. Again, you can use a Maretron display to program the
appropriate NMEA 2000
®
instance. Refer to the J2K100 User’s Manual (Section 2.5) for a
description of configuring a J2K100.
4.2 Single Engine/Genset, Single J1939 Network Installation
Figure 6 shows a single engine/genset, single J1939 network installation diagram. This type of
system already has a working J1939 network so there is no need to build the entire J1939
network as described in Section 4.1.
Figure 6 – Single Engine/Genset, Single J1939 Network Installation Diagram
This configuration requires an additional drop or stub from the J1939 trunk or backbone to the
Maretron J2K100. 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 6 shows the J2K100 drop or stub (i.e.,
connection between J1939 network and Maretron J2K100) 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 so it
responds to the appropriate J1939 address. Most single engine installs have the J1939
address set to 0, but not always, so check with the engine manufacturer and use a Maretron
NMEA 2000
®
display (DSM200/DSM250) to program the J2K100 with the corresponding
J1939 address. On the NMEA 2000
®
side, most single engine displays are looking for the
J1939
Display
J1939
Engine or
Genset
Installed J1939 Network
(Usually Twisted Pair)
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
(23 paginas)
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