0 – off (all outputs off) 1 – Steady on 2 – Slow flashing 3 – Fluorescent flicker A, more on than off 4 – Fluorescent flicker B, more off than on 5 – Fluorescent flicker C, a definitely dying fluorescent tube 6 – Single strobe light (every 2 seconds) 7 – Double strobe light (every 2 seconds) 8 – Rotary beacon 9 – Railroad crossing signal phase A 10 – Railroad crossing signal phase B 11 – Random on/off (times from 4 seconds to 1 minute) 12 – Random on/off (times from 4 seconds to 2 minutes) 13 – Random on/off (times from 8 seconds to 4 minutes) 14 – Mercury vapor street light (coming on over about 30 seconds) 15 – Rapid flashing