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problem_solving_questions [2012/06/11 22:38] – created heinzproblem_solving_questions [2014/10/18 13:45] – heinz
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 +====== Problem Solving Questions ======
 +
 Why is my CAN not working ? Here are some Problem Solving Questions 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. 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+  * Are there two 120 Ohm resistors across the bus at each end to terminate the network drivers? See [[CAN Cabling|CAN Cabling]] and DeviceNetCable
  
   * Is there at least one other node on the bus?    * Is there at least one other node on the bus? 
  
-  * Are both CAN tranceivers (when there are only 2 nodes) fault tolerant? +  * Are both CAN transceivers (when there are only 2 nodes) fault tolerant? 
  
   * Are all the nodes CAN-A or are there CAN-B compliant devices?   * Are all the nodes CAN-A or are there CAN-B compliant devices?
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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?".   * 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+  * Are you using an CAN speed according your network cable length ? See [[CAN Cabling|CAN Cabling]] 
 + 
 + 
 + 
 +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. 
 + 
 + 
 +===== Collection of other hints ===== 
 + 
 +For cabling problems [[http://www.kfz-tech.de/Engl/CAN-BusF1.htm | this site ]] shows some signal screen shots for common problems.  
 + 
 +[[ http://canbusacademy.com/ | CANbus Academy]] has created a "**CAN bus Troubleshooting - Quick Reference**" which is available on [[http://canbusacademy.com/can-bus-troubleshooting-pdf-sheet/ | request]]. This pdf contains some key test procedures to troubleshoot a CAN bus using a multimeter. 
 + 

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