On-Net Surveillance Systems, Inc.
NetDVR 6.5
Administration
86
Note:
Before you specify use of external input and output units on a device, verify that sensor operation is recognized
by the device. Most devices are capable of showing this in their configuration interfaces, or via CGI script commands.
Also check the release notes to verify that input and output controlled operations are supported for the device and
firmware used.
Using Dedicated I/O Devices
In addition to IP video camera devices and IP video encoder devices it is possible to add a number of dedicated I/O
(input/output) devices to NetDVR (see
). For information about which I/O devices are supported,
refer to the release note.
When such I/O devices are added, input on the I/O devices can be used to generate events in NetDVR, and events in
NetDVR can be used for activating output on the I/O devices. This means that I/O devices can be used in your
events-based system setup in the same way as a camera.
Note:
When using some I/O devices it is necessary for the surveillance system to regularly check the state of the
devices' input ports in order to detect whether input has been received. Such state checking at regular intervals is
called
polling
. The interval between state checks, called a
polling frequency
, is specified in the
. For
such I/O devices, the polling frequency should be set to the lowest possible value (one tenth of a second between
state checks). For information about which I/O devices require polling, see the release note.
I/O Setup
I/O Setup Window
The
I/O Setup
window lets you define input events, VMD (Video Motion Detection)
events and output for devices on
your surveillance system.
When events occur, they can trigger one or more actions:
•
Input events
occur when input from an external input unit is received on a device's input port, for example
when an external sensor detects that a door is opened. Some devices also have their own capabilities for
detecting motion, for detecting moving and/or static objects, etc. (configured in the devices' own software;
typically by accessing a browser-based configuration interface on the device's IP address), in which case
such detections from the device can also be used as input events.
•
VMD events
occur when NetDVR detects motion on a particular camera.
•
Outputs
are used for activating external output units, for example for switching on lights or sounding a siren.
The
I/O Setup
window is used for defining which input events, VMD events and outputs should be available on your
system.
Input and VMD events can be used for triggering outputs or for triggering various actions on the surveillance system
itself, such as for starting or stopping cameras (configured in the
) or for moving a
PTZ camera to a particular preset position (configured in the
window (for PTZ preset positions on event)
Once you have defined input events, VMD events and outputs, you are able to associate specific input events or VMD
events with specific outputs in the
, so that, for example, lights are switched on when a door is
opened or when motion is detected on a camera. Outputs may also be triggered by motion detection on a specific
camera—even without a defined VMD event—or manually through the
; both are configured in the
Output Settings for [Device Name] [Camera Name]
.
