CAN Interface¶
Connect the device interfaces to the CAN bus whose data you want to visualize.
For test purposes, connect the device to a PC using a communication gateway (e.g. PCAN-USB - CAN/USB Interface).
The CAN connection terminal CAN-High and CAN-Low signals must match the signals of the connector on the device.
The following table provides an overview of some CAN baud rates in relation to the bus length:
| CAN baudrate | Maximum bus length |
|---|---|
| 1 Mbit/s | 25 m |
| 800 kbit/s | 50 m |
| 500 kbit/s | 100 m |
| 250 kbit/s | 250 m |
| 125 kbit/s | 500 m |
| 50 kbit/s | 1000 m |
CAN Bus Termination¶
In any bus system, signal reflections at the end of a wire or cable can cause interference which can in turn cause transmission errors.
To minimize the reflections, place a termination resistor at each end of transmission lines.
The terminating resistance between CAN-High and CAN-Low must match the characteristic impedance of the transmission lines.
In CAN bus networks, normally unshielded, twisted cable pairs are used for signal transmission.
The characteristic impedance of the transmission lines is around 120 Ohm. So, the termination resistor between CAN-High and CAN-Low must be rated 120 Ohm.
CAN1, CAN2, and CAN3 support a 120 Ohm bus termination resistor, available as a hardware assembly option depending on the ordered variant.