Alliance System Data Gathering Panels (DGP) are used to expand the number of inputs on the system, and they allow you to setup inputs and relays at locations away from the panel. DGPs communicate with poll-and-reply messages and send alarms to the AL-4017 control panel for processing.
The AL-1205 includes 8 standard inputs, and a siren driver. This standard configuration can be expanded to up to 32 inputs and 16 outputs.