Solvline CS-CAN Command Manual - Manual (Page 12)

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Error Code
2.4 Error Code
Command ER(C)<CR>
Description - This indicates that the error has occurred.
- C  Error Code
If no Error Code is provided, the message is incorrect.
1: Passive 2: Warning 3: Bus off
4: Stuff error 5: Form error 6: Ack error
7: Bit1 error 8: Bit0 error 9: CRC error
Example - If returned value is ER<CR>, it means CS-CAN did not understand the
command. You have to check whether the command is correct.
- If returned value is ER3<CR>, CS-CAN sets the status to the Bus off. You have
to use reset command to recover from it.