A CAN bus consists of a main bus (trunk) with devices individually joined to the bus.

Each end of the bus must be terminated with a 120R resistor (1/4 Watt minimum).

The trunk (main bus) must be a total length of less than 15m.

The two wires of the bus must be twisted together with a rate between 33 and 50 twists per meter. (20mm to 30mm between twists)

Each device needs to be connected into the main bus. The length of the wire used to connect to the bus must be less than 200mm.

To simplify the installation, the following devices contain terminating resistors:

·Link G4XECUs.

·DisplayLink. Note that the terminating resister is in the connector of the displays power supply cable.

This means that these devices can only be used at the end of the bus. If you want to connect these devices to the middle of the bus, please contact your local Link distributor to arrange the removal of the internal resistor.

Example

The following is an example using devices to terminate the bus.

Hints

·Run the trunk as close as possible to all devices. It is important to minimise the length of the connection from the device to the bus.