14 Facts About CAN bus

Controller Area Network is a robust vehicle bus standard designed to allow microcontrollers and devices to communicate with each other's applications without a host computer.

CAN bus is one of five protocols used in the on-board diagnostics -II vehicle diagnostics standard.

Low-speed fault-tolerant CAN bus signaling operates similarly to high-speed CAN bus, but with larger voltage swings.

High-speed CAN is usually used in automotive and industrial applications where the bus runs from one end of the environment to the other.

Fault-tolerant CAN bus is often used where groups of nodes need to be connected together.

The improved CAN bus FD extends the length of the data section to up to 64 bytes per frame.

Devices that are connected by a CAN bus network are typically sensors, actuators, and other control devices.

CAN bus specifications use the terms "dominant" bits and "recessive" bits, where dominant is a logical 0 and recessive is a logical 1.

Exact voltages for a logical 0 or 1 depend on the physical layer used, but the basic principle of CAN bus requires that each node listen to the data on the CAN bus network including the transmitting node itself.

The CAN bus controller expects the transition to occur at a multiple of the nominal bit time.

Such nonstandard wire harnesses that join conductors outside the node reduce CAN bus reliability, eliminate cable interchangeability, reduce compatibility of wiring harnesses, and increase cost.

Multiple access on CAN bus is achieved by the electrical logic of the system supporting just two states that are conceptually analogous to a 'wired AND' network.

CAN bus is a low-level protocol and does not support any security features intrinsically.

Logic analyzers and bus analyzers are tools which collect, analyse, decode and store signals so people can view the high-speed waveforms at their leisure.