Hardware input, such as door sensors, can be attached to input ports on hardware devices. Input from such external hardware input units can be used for generating events in your system.
Hardware output units can be attached to output ports on many hardware devices, allowing you to activate lights, sirens, and more from your system. Such hardware output can be activated automatically by events, or manually from clients.
Before you specify use of hardware input and hardware output units on a hardware device, verify the hardware device recognized the sensor operation. Most hardware devices are capable of showing this in their configuration interfaces, or via CGI script commands. Also check the system's release notes to verify that the hardware device and firmware used supports input and output-controlled operations.
You do not have to configure hardware input units separately. Any hardware input units connected to hardware devices are automatically detected when you add the hardware devices to your system. The same goes for hardware output, but hardware output does require some simple configuration in your system.
If you want to configure hardware output and automatically trigger output when events occur, so that, for example, lights are switched on when a door is opened or when motion is detected in video, see Add a hardware output and Configure hardware output on event.
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