Block Signalling ASP2A Led Signal Controller This Signal Controller detects trains by bouncing invisible Infra-Red (IR) light off the underside of the rolling stock, and detecting the light reflected back. Once triggered by the train, the module runs built-programs to simulate the operation of 2-, 3- or 4-aspect signals. Uses an infra-red sensor mounted below the track to detect trains passing above When a train is detected, the module triggers the signal to switch to red Signal automatically switches back to green (through yellow and double-yellow if appropriate) Flexible programming options to suit different signals and to allow adjustment of timings to suit Designed for signals which need 12V to be switched to them to light their leds (common cathode) Realistic fading between aspects. Yellow and Double-Yellow stages will change to red if another train passes. For Common-Anode led signals only
