EMTRON EIC USER MANUAL
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© EMTRON AUSTRALIA PTY LTD APRIL 2018
12
3.8 CAN Bus Wiring
▪
CAN Bus High and Low are differential signals, so twisted pair
MUST
be used. Failing to
do so will compromise the entire CAN Bus System.
▪
In some extreme environments, shielded twisted pair may be required to help with
reliability and data integrity.
▪
The less connectors in any transmission system the better. Unnecessary connectors are
almost guaranteed to present an impedance discontinuity and hence may cause
reflections and data loss.
▪
CAN Bus termination must be done correctly by using a 120 ohm 0.25W resistor at each
END of the bus system.
▪
Maximum Stub length to a device from the main Bus is recommended at 0.3m, in
accordance with High-Speed ISO 11898 Standard specification. See Figure 3.3.
The EIC16M and EIC10 devices do
not
include an on-board CAN termination resistor,
allowing the device to be wired at any position on the Bus. CAN Bus termination must be
done correctly by using a 120 ohm 0.25W resistor at each end of the bus system as
mentioned above. Figures 3.1 and 3.2 show possible CAN Bus Implementation examples.
Figure 3.1. CAN Bus Wiring Example. ECU and Dash at each end with 120 Ohm Termination
