MoTeC PLM - Manual (Page 42)

42 Appendices
Appendix H – General CAN Bus Wiring
The CAN bus should consist of a twisted pair trunk with 100R (0.25Watt)
terminating resistors at each end of the trunk.
The preferred cable for the trunk is 100R Data Cable but twisted 22# Tefzel is
usually OK.
The maximum length of the bus is 16m (50ft) including the MoTeC CAN Cable
(PC to CAN Bus Communications Cable)
CAN Devices (such as MoTeC PLM, ADL, etc) may be connected to the trunk
with up to 500mm (20in) of twisted wire.
The connector for the CAN Communications Cable may also be connected to
the trunk with up to 500mm (20in) of twisted wire and should be within 500mm
of one end of the trunk. If desired two CAN Cable connectors may be used so
that the MoTeC CAN Cable may be connected to either side of the vehicle.
Both connectors must be within 500mm of each end of the trunk.
CAN-LO
CAN-HI
100R
100R
CAN
-LO
CAN
-HI
CAN
Device
500mm
Max
CAN
-LO
CAN
-HI
CAN Cable
Connector
500mm
Max << CAN Bus >>
500mm Max
100R Terminating
Resistors at each
end of the CAN Bus
CAN
-LO
CAN
-HI
CAN
Device
CAN
-LO
CAN
-HI
CAN
Device
0V
8V
5 4 3 1
These wires must be Twisted
Minimum one twist per 50mm (2in)
Short CAN Bus
If the CAN Bus is less than 2m (7ft) long then a single termination resistor may
be used. The resistor should be placed at the opposite end of the CAN Bus to
the CAN Cable connector.