![]() ![]() Refer to the table and drawings below for common signal measurements. When CAN voltages are measured with a multimeter, only the average voltage is displayed. If one or more termination resistors are missing, communications may work temporarily but will be unreliable and eventually fail. for a display, verify the option is enabled in a settings menu). Instead, follow the manufacturer's instructions to verify an electronically switched termination resistor is enabled (ex. In these instances, it cannot be detected by measuring resistance. In some instances, a termination resistor may be located inside a device and switched electronically. This measurement should be conducted with the device power off. When you measure the resistance between CAN HI to CAN LOW on a wiring harness you should measure 60 ohms. There should be a 120-ohm termination resistor located at each end of the bus to prevent signal reflections. Note: For in-depth detail about the physical layer, we recommend you read Application Report (SLLA270) from Texas Instruments. Introduction to the CAN Bus Physical LayerĬAN bus nodes are connected over a two-wire bus with 120-ohm nominal twisted-pair cable. The below video and other guides will equip you with the knowledge and confidence you need to troubleshoot CAN bus problems quickly and easily. Having a good understanding of how a CAN bus network is supposed to be configured and how to troubleshoot any problems is vital to our customers continued success. Our products are designed to communicate with engine ECUs and other devices over a CAN bus, but this guide is not limited to using the CAN Bus with our products. We created this tutorial to help our customers solve the most common problems they may encounter when dealing with a communication failure on a CAN bus. ![]()
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