Checksum of Received Data

vl400 · Post by **vl400** » Thu Mar 29, 2012 4:06 pm

Have found on a few vehicles that there are occasional bit errors in the data stream, when this happens the logged data loses a few samples (sometimes for up to 5 seconds).

Is it possible to add an option in the ADX config for using the checksum that is in the data stream? I am not sure if all vehicles use checksumming but for ALDL based GM vehicles the last byte is the checksum (calc'd the same way as the transmit frame checksum that requests data from the ECU).

Post by **dex** » Fri Mar 30, 2012 11:06 pm

Can you not add the checksum as an ADX item and log it with the other parameters?

vl400 · Post by **vl400** » Fri Mar 30, 2012 11:52 pm

Yeah you can, but I would like TP to discard the frame instead of processing it on a CS error. I couldnt see a way to do that with the current ADX options?