How to set each timer

A switch inside the voice computer circuit board

How to set a timer for the approach broadcasting

*A place for ten seconds, SW2, 4, 6, 8 are places for one second with SW1, 3, 5, 7.

1.The timer set of No.1 line

Passage broadcasting is set with SW1 and SW2.
Be the place where a train approached as much as the home front 50m, and set it to finish broadcasting.

Stop broadcasting is set with SW3 and SW4.
Be the place where a train approached as much as the home front 50m, and set it to finish broadcasting.

2.The timer set of No.2 line

Passage broadcasting is set with SW5 and SW6.
Be the place where a train approached as much as the home front 5Om, and set it to finish broadcasting.

Stop broadcasting is set with SW7 and SW8.
Be the place where a train approached as much as the home front 5Om, and set it to finish broadcasting.