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Digital Input Output (DIO) |
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November 2010 |
DIO refers to the capability of a camera to process input and output in digital format (+-5V). Such cameras would have a termination block on the rear side of the camera for DIO connection, and there is no standard or convention on how many DIO provisions a camera should have. Most have none, some have 1 DI and 1 DO and few have more than 1 each.
What is DIO for? In the context of surveillance cameras, DI is an event and DO is a response. For example, DI can be the state of a lock on the window and DO can be the light of the room. When some one has broken into the room through the window, the window lock (when opened) produces a DI signal to the camera. With pre-defined algorithm, the camera can trigger the DO to operate the light of the room. The room will suddenly become bright and the camera will record with higher clarity.
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