On-Net Surveillance Systems, Inc.
NetDVMS 6.5f User Manual
Input, Events & Output
104
automatically sound (output). If you want users to be able to manually activate output when operating
specific cameras, you specify this in the
Output Settings for [Device Name] [Camera Name] window
.
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.
Note: If you are using several NetDVMS servers in your surveillance solution, input and output on a
specific device should be defined on one of the servers only. Do not define the same input or output
on the same device on several servers. This applies even for dedicated I/O devices (see also
Using
Dedicated I/O Devices
).
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 NetDVMS (see
How to Add a Device
). 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
NetDVMS, and events in NetDVMS 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
Advanced window
. 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
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 NetDVMS 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
Camera/Alert
Scheduler window
) or for moving a PTZ camera to a particular preset position (configured in the
Event
window (for PTZ preset positions on event)
).
