CAN (Controller Area Network)

CAN stands for Controller Area Network. Its automotive standard serial asynchronous(In CAN the data transmission not based on the clock so CAN is asynchronous. Instead of clock it is based on the time quanta) protocol and its mainly designed for automotive industry but now a days so many industries are using CAN protocol.

  • Its multi-master and single terminated twisted pair cable
  • Its half duplex high speed network system
  • maximum signal frequency used 1 Mb/sec
  • Length is typically 40 meters at 1mbps up to 10kms at 5kbps
  • It has high reliability and extensive error checking 
  • Typical max data rate achievable is 40kbps 
  • Maximum latency of high priority message <120 micro seconds at 1 mbps
  • We can connect the devices up to 110 nodes on single network
  • The data rate of the 1 mbps it allows a real time controller at the length of the bus is 40 meters
  • It supports up to 6 kms with data speed 5kbps
  • CAN is entities of the network that we called nodes. Nodes are not given any specific address
  • The error detection and the fault confinement feature make it more reliable in noise critical environment.

Two Specifications are in use: 
  1. Basic or standard CAN with 11 bit message identifier which was originally specified to operated at max frequency of 25kbps
  1. Full or extended CAN with 29 bit message identifier which can be used up to 1 mbps


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