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.
- Are there two 120 Ohm resistors across the bus at each end to terminate the network drivers? See CanCabling and DeviceNetCable
- Is there at least one other node on the bus?
- Are both CAN tranceivers (when there are only 2 nodes) fault tolerant?
- Are all the nodes CAN-A or are there CAN-B compliant devices?
- Are the grounds between nodes connected together?
- 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?".
- Are you using an CAN speed according your network cable lenght ? See CanCabling
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