MICRO CONTROLLER BASED LED PANEL FOR DEMU DPC COACHES OF SIZE 425MM ( LENGTH ) X 180MM ( WIDTH ) X 50MM ( DEPTH ) WITH 24 LED INDICATIONS TO BE POWERED BY VEHICLE INTERFACE UNIT PLACED AT ENGINE CABIN WHERE ALL THE 110V DC FAULT INPUTS WILL BE TERMINATED. TWO WIRES FOR 24V DC AND TWO WIRES FOR THE COMMUNICATION RUNS FROM THE VEHICLE INTERFACE UNIT TO LED PANEL. COLOUR SCHEME AND NAME AS PER BHEL DRG. NO. 15890030037, ITEM NO. 001, REV. 7