Hi Bert,

LRC stands for 'Longitudinal Redundancy Check' and is also used in Smartcard communications (T=1 protocol, for those in the know). Basically it is nothing more than the sequential XOR of all the bytes in the datastream.

For example, if you have the following data:
'00 40 02 90 00'
the LRC will be 00^40^02^90^00 = D2

That's all there is to it. Good luck.

Regards,
Rob Klein