The four digits are indicated by four series of flashes.
The first series of flashes indicates the first digit, and so on until all four digits have been flashed.
Each series consists of a number of 1- or 2-second flashes, separated by short pauses. Each integer (whole number) in the range 1 to 9 is represented by a number of 1-second flashes, and each zero is represented by 2-second flashes.
A 2.5-second pause separates each series of flashes.
The code number "0132" is indicated by a 2-second flash, a short pause, a 1-second flash, a short pause, three 1-second flashes, a short pause and two 1-second flashes. After 2.5 second pause, the code will be repeated.