Sending 11 bit Multipacket CAN message

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Adrian Barber

• June 06, 2018 17:44

Hello again,

we tried to re use some of the learning gained from Boyce on a previos project where we had to write a multipacket J1939 29bit message by script.

 

This time we need to sent an 11 bit message.

 

With the CANMessageInfo set as standard frame, we only get 8 bytes of data to the correct 11 bit ID.

if we rem out the standard packet and have the multipacket, we get the correct DLC and all 18  bytes of data are correct, but the ID is completely incorrect:

Is there a setting in the script which would allow 11 bit IDs with multipacket?

 

Many thanks, Dave.

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  Boyce S.

  • June 07, 2018 13:54

  Hello Dave,

  It is using the multipacket PGNs because the size is bigger than 8.  I have not heard of standard packet ids to send multipacket messages.

  Thanks,

  Boyce

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  Adrian Barber

  • June 07, 2018 14:50
  • Edited

  HI Boyce,

  this ECU uses ISO-TP  for some of it's diagnostic services which we need to send 18 bytes of data to an 11 bit identifier.  Is this not 'multipacket' ?

   

  could this go into the feature request list?

  Cheers, Dave.

   

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  Boyce S.

  • June 07, 2018 18:04

  Hi Dave,

  Yes it can go in the feature request list.  It's here: https://support.enovationcontrols.com/hc/en-us/community/topics/115000333587-Request-Features  It would probably mean more if you entered it.

  There is the option of sending the desired standard frame packets as Free Form messages.  But it would be manual and would require some scripting (on color displays).

  Thanks,

  Boyce

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  Adrian Barber

  • June 08, 2018 05:57

  will do :)

   

  OK so I guess we could sent 4 sequential  8 bytes frames by a script, that 'appears' as transport protocol ... good idea :) thanks.

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