A security system control panel receives input information from ? .

A security system control panel receives input information from ? .

• A. Sensing devices
• B. Doors
• C. Occupants
• D. Alarms only

Answer: (A)

The central idea is that the security system’s control panel gathers signals from sensing devices. These sensors—such as motion detectors, door and window contacts, glass-break sensors, and other environmental monitors—are the actual input sources. They continuously watch for changes or events and send electrical signals to the control panel, which then processes them to decide whether to trigger alarms, log events, or notify monitoring. Doors themselves aren’t input sources unless they have sensors attached; occupants can interact with the system via interfaces like keypads or remotes, but those are user interfaces rather than the continuous input sources the panel relies on. Alarms are outputs, not inputs, so they don’t feed information back into the panel.

The central idea is that the security system’s control panel gathers signals from sensing devices. These sensors—such as motion detectors, door and window contacts, glass-break sensors, and other environmental monitors—are the actual input sources. They continuously watch for changes or events and send electrical signals to the control panel, which then processes them to decide whether to trigger alarms, log events, or notify monitoring. Doors themselves aren’t input sources unless they have sensors attached; occupants can interact with the system via interfaces like keypads or remotes, but those are user interfaces rather than the continuous input sources the panel relies on. Alarms are outputs, not inputs, so they don’t feed information back into the panel.