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| — | can_faq:problem_solving_questions [2018/08/21 23:08] (current) – created - external edit 127.0.0.1 | ||
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| + | ====== Problem Solving Questions ====== | ||
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| + | Why is my CAN not working ? Here are some Problem Solving Questions | ||
| + | This page should help you to find out why your network is not working by providing questions. Answering these questions should help to find out what is possibly going wrong. | ||
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| + | * Are there two 120 Ohm resistors across the bus at each end to terminate the network drivers? See [[CAN Cabling|CAN Cabling]] and DeviceNetCable | ||
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| + | * Is there at least one other node on the bus? | ||
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| + | * Are both CAN transceivers (when there are only 2 nodes) fault tolerant? | ||
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| + | * Are all the nodes CAN-A or are there CAN-B compliant devices? | ||
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| + | * Are the grounds between nodes connected together? | ||
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| + | * Are you using a Commercial Off The Shelf (COTS) dongle to listen in on the messages. In other words: "can you trust at least one member at the bus?". | ||
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| + | * Are you using an CAN speed according your network cable length ? See [[CAN Cabling|CAN Cabling]] | ||
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| + | If you can't detect the problem, segment the CAN bus into small parts to isolate the problem. | ||
| + | Split the bus in the middle, then the side which caused the problem again, and again - this is the fastest way to find the cause. | ||
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| + | ===== Collection of other hints ===== | ||
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| + | For cabling problems [[http:// | ||
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| + | [[ http:// | ||
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