Signalling

Signalling

here is a message sequence chart for railway signalling.

Bell:

Bellcode repeater - using a PICchip or Arduino to repeated bell sequence.

http://www.dougrice.plus.com/wetString/bellcode/BellCodesTrimmed.htm - web page with javascript prototype

Block Instruments:

JavaScript Simulator:- http://www.dougrice.plus.com/wetString/blockSignalling/signalling.htm