The HDM-204 Module provides the HCP-204E Fire Alarm Control Panel with up to 4 Class B (Style B) or 2 Class A (Style D) Initiating Circuits. In addition it provides up to 2 Class A/B (Style Z/Y) Indicating Circuits which are rated for 1.7 Amps each. Each of the indicating circuits can be configured for silenceable or non silenceable. In addition each circuit comes with an individual trouble indicator. All circuits are power limited for use with limited energy cable. The HDM-204 consists of a PC board which mounts at the bottom of the chassis. The PC board is connected via cables to the board on the main chassis.