Long flashes > RED
1 Z = Non-original code block
2 Z = Code with lower priority than the authorised level
Short flashes > RED
1 Z = Undefined
1 Z = Undefined
2 Z = Undefined
Long flashes > ORANGE
1 Z = (on start-up, after a few green flashes) indicates the presence of two-way transmitters
Short flashes > ORANGE
2 Z = Undefined
English - 16