MoTeC BR2 BTX - Manual (Page 44)

42 Appendices
Appendix K – 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 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 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-
LO
CAN-
HI
0V
8V
5 4 3 1
These wires must be Twisted
Minimum one twist per 50mm (2in)
CAN Device
eg M800
CAN Device
eg ADL
CAN Device
eg BR2
Short CAN Bus
If the CAN Bus is less than 2m (7ft) long or there is only one CAN device then
a single termination resistor may be used at the opposite end of the cable as
the CAN Cable connector.