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???
08/07/06 18:44
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 		 #121802 - I searched all their site
Responding to: ???'s previous message
Thanks Erik, I should have given the links I found in here.
I searched all the company's documentation which are quite alot, searched all the FAQ section and the datasheet of the actuall encoder. All point to a interface protocol called EnDat 2.1 (short for EncoderData).
I found a very long documentation about this protocol EnDat2.2 which is compatible with EnDat2.1. the document is quite large 45 pages and they only mention that the CRC is 5 bit and they give the order of the bits.
I searched all the internet for 5bit CRC code and I only found two choices 0x15 which is X**4 + X**2 + 1 or USB 5 bit CRC which is 0x12 which is X**4 + X
I tried both polynomials with no luck. While reading all the datasheets and application manuals I noted few things we didn't take into consideration while programming the encoder. Will redo them and try again.
Actually I have two encoders which I ripped of a CNC machine and gave them as an excercize to a young engineer working with me.
Mahmood


List of 36 messages in thread
TopicAuthorDate
5 bit CRC polynomial            01/01/70 00:00      
   there are several            01/01/70 00:00      
   what does "no success" mean?            01/01/70 00:00      
      He said            01/01/70 00:00      
         maybe we need a new 'forum' where            01/01/70 00:00      
      They said            01/01/70 00:00      
         This must be a very smart shaft encoder            01/01/70 00:00      
            competitor like Kuebler            01/01/70 00:00      
         This must be a very smart shaft encoder            01/01/70 00:00      
         Brute force it.            01/01/70 00:00      
            Yes this is what we were doing            01/01/70 00:00      
   can you find it in the pascal here? -- Kai            01/01/70 00:00      
      zyklische Redundanzprüfung            01/01/70 00:00      
      I searched all their site            01/01/70 00:00      
         did you search the pascal code examples            01/01/70 00:00      
            Where?            01/01/70 00:00      
               I did not look at it all, but there is much here            01/01/70 00:00      
                  I downloaded them all            01/01/70 00:00      
                     what about all the .pas            01/01/70 00:00      
      Found a document name            01/01/70 00:00      
         I feel your pain            01/01/70 00:00      
            This is how we get experienced            01/01/70 00:00      
               CRC time            01/01/70 00:00      
                  FPGA option            01/01/70 00:00      
                  SiLabs            01/01/70 00:00      
               have you seen this?            01/01/70 00:00      
                  Maybe it is X^5+X^4+X^3+X^2+X+1            01/01/70 00:00      
   rather than all that processing            01/01/70 00:00      
      The thing is            01/01/70 00:00      
         USB 5bit CRC            01/01/70 00:00      
         implementing other crc using crc package            01/01/70 00:00      
            impressive            01/01/70 00:00      
   rather than all that processing            01/01/70 00:00      
   Initial value?            01/01/70 00:00      
      and the final value            01/01/70 00:00      
   Friends            01/01/70 00:00      

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