Turn on the unit
Hold down buttons 6 and 1, and then release 6 (keep 1 pressed).
The unit will then cycle through a load of stuff. The first screen ends with the serial number of the device:
Mxxxxxx
Thanks again for the code generator....it worked like a charm
![Smile :-)](./images/smilies/icon_e_smile.gif)
cheers
DrWig