MoTeC DBW-4 - Manual (Page 17)

MoTeC DBW-4 17 Introduction
Appendix D: 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
1
0
0
R
1
0
0
R
C
A
N
-L
O
C
A
N
-H
I
500mm
Max
C
A
N
-L
O
C
A
N
-H
I
CAN Cable
Connector
500mm
Max << CAN Bus >>
500mm Max
100R Terminating
Resistors at each
end of the CAN Bus
C
A
N
-L
O
C
A
N
-H
I
C
A
N
-L
O
C
A
N
-H
I
0V
8V
5 4 3 1
These w ires must be Tw isted
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 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.