Furuno CAN bus Network Design Guide
2
Backbone
cable
Terminator
Furuno
CAN bus
Device
Drop
cable
6 m (max.)
NMEA 2000
T-connector
+Vdc
Shield
Gnd
Terminator
Furuno
CAN bus
Device
Drop cable
Drop cable
1.2 Network Connections
Like a NMEA 2000 network, Furuno CAN bus networks consist of lengths of network
Backbone cable with a defined beginning and end. A resistive terminator (120 ohms, 1/4 W) is
connected at each end to reduce transmission-line reflections. See Fig.1.
Furuno Can bus devices are connected to the network backbone cable with a single Drop
cable. The maximum cable length of the drop cable is 6 m and the sum of the drop cables
should not exceed 60 m.
Power supply or battery connections are made to the network backbone cable either directly
or by means of a dedicated cable. Some Furuno CAN bus devices can power the network
through the network connector.
(15 Vdc recommended)
Fig.1 Typical Furuno CAN bus Network Topology
The T-connector is used to construct a Furuno CAN bus backbone and to extend the
backbone with appropriate lengths of backbone cable. The T-connectors can be separated by
the backbone cable or connected directly together. When constructing the network, take the
following into account;
1) Use one T-connector per device (see Fig.3).
2) Use the sides of the T-connectors to construct the backbone of the network.
(Furuno CAN bus device with an internal terminator is connected to the side of the
T-connector.) Fig.5
3) Use the top of the T-connector to attach a device.
Fig.2
Fig.3
Device
Device
Device
Device
