MoTeC M880 - Manual (Page 88)

86 Appendices
Appendix J: CAN Wiring - Multiple Device
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 ADL, BR2 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
10
0R
1
00R
CAN-
LO
CAN-
HI
CAN
Device
500mm
Max
CA
N-LO
CA
N-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.
Single Device
See Appendix K: CAN Bus Wiring - Single Device.