Guidance to verify a defective CAN-Transceiver

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G.Lang
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Guidance to verify a defective CAN-Transceiver

Post by G.Lang » Fri 3. Dec 2010, 13:10

Below a short guidance to verify a defective CAN-highspeed transceiver (for example NXP82C251 or MAX3057ASA)

1. Start the computer and take care that the CAN-hardware is built-in or plugged in

2. Please take care that no CAN-application is running or using the PCAN-hardware (for example: the LED from the PCAN-USB adaptor must be ON and not flashing), otherwise please close the application

3. Disconnect the CAN-connector or CAN-cable physically from the module

4. Please measure with a multimeter (DC measurement area) the voltage the between pin 2 (CAN-L) and pin 3 (GND) from the 9 pole D-SUB. You should measure 2.5V +/- 0.2V :D

5. Now measure the voltage between pin 7 (CAN-H) and pin 3 (GND) from the 9 pole D-SUB, you should also measure 2.5V +/- 0.2V :D

6. If you measure other voltages :shock: then it looks that the CAN-transceiver is defective :cry: (through overvoltage or static electricity charge)

Note: This is only a quick check

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