Each code is made up of two series of flashes.
The first series indicates the 'tens' digit.
The second series indicates the 'ones' digit.
A long pause separates each code.
A shorter pause separates the 'tens' and 'ones'.
Each code is repeated three times, then the next code is displayed.
Code Format Diagram shows code No. 32.
The first code "flashed out" is always code 12.
If Code 12 repeats at least 4 times in a row there are No Codes in memory.