CAN Bus Networking with
CAN bus was created by the Society of Automotive Engineers (SAE) out of a need to simplify and reduce the amount of wiring within the automobile industry. A modern car can have over 80 sensors or actuator nodes (i.e. brakes, engine management, indicator lights, dashboard buttons, airbags, etc) that could require over 2.2kms of wiring to interconnect. CAN bus provides a highly reliable and simplified system that allows each sensor to communicate directly with each other and dramatically reducing the amount of wiring and connections required. Today CAN bus is used in all modern road vehicles, marine craft, earthmoving and military vehicles. The system is a low cost, very robust against failure, and electromagnetic interference.
To create a PowerPlex CAN bus network you will need 4 wires:
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Positive (+) DC Power Supply (9 to 32 Vdc)
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Negative (-) DC Power Supply (0Vdc)
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CAN-L Digital Signal (0 to 5V)
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CAN-H Digital Signal (0 to 5V)
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It is best for the CAN-L and CAN-H signals to be a twisted pair shielded cable. The shields between each cable lengths should be connected together, and then connected to Negative (-) DC Power Supply at only one end of the joined cable run.
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CAN bus requires 3 wires to communicate for signals CAN-L, CAN-H and GND. These 3 wires must be connected to all modules on the network for two-way communications to occur. The CAN-L andCAN-H signals operate between 0V and 5V.
