40 Electronic Control System: Technical Manual for 6LY3 Series
CM100xx: CANBus “Backbone” (from “T” to “T”)
Overview
The Yanmar NMEA 2000 Data Bus provides a CANbus Network through which data and power can
be accessed by all units on the Bus. This eliminates signifi cant amounts of point to point wiring and
allows all information to be shared. Products from Yanmar and any other manufacturer of certifi ed
NMEA 2000 product can all work on the same data bus.
Dynamic network addressing automatically assigns the products on the network an address which
means they are truly “Plug and Play”. This means there is no need to set jumpers to defi ne an
available address on the network. The software accomplishes this through a method referred to as
Address Claiming. In simple terms a device coming onto the network will try to “Claim” an address.
This request is sent to all units and via a negotiation based on the unit’s name all the units on the
network will resolve a set of addresses.
The physical parameters of the network are:
• Up to 50 physical connections known as nodes may be used.
• Baud Rate 250kbits/second
• Length 200 meters maximum – Long length may affect signal quality and power supply
may be limited due to voltage drops (IR losses)
• Drop Length, maximum: 6 meters – however Yanmar recommends this to be as short as
possible.
• Node separation, minimum: 0 – “T” connectors can be stacked together.
• The Yanmar system is 100% NMEA 2000 Certifi ed.
Connecting to the Network
NMEA 2000® Network
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