Table of Contents
Advertisement
Title TransVu 3 DVR Installation Manual
Page 45 of 66.
The new approach allows the monitoring of alarm inputs local to the unit itself (such as physical
alarm inputs, Video Motion Detection and camera failure), alarm inputs at each camera and virtual
alarm inputs and variables received over the network from other third-party systems.
Expression: The first column in the page is used to enter the details of the alarm input or trigger
which will cause the associated actions in the same row to take place.
All devices (physical or virtual) which can trigger events are named. One example is
LOCAL_INPUT_1, which is physical alarm input number 1, connected to the 25-way alarm input
connector on the rear panel of the NVR. Another example is VMD(1) which is a video motion
detection alarm from camera number 1. A complete list of expression keywords can be seen by
viewing the System>Status>About>Alarm Keywords page of the NVR.
Actions (active): The second column in the page is used to enter the required action desired when
the expression in the left-hand column is true (active).
Actions (inactive): The third column in the page is used to enter the required action desired when
the expression in the left-hand column is not true (inactive).
For example, remembering that that the physical alarm inputs on the unit are normally closed
(N/C), the expression C=NOT LOCAL_INPUT2 means that this will be the condition where Alarm
Input #2 is open circuit (not closed). In that case, the action DBASE 1 System ALARM creates a
database entry for camera 1 being in the ALARM state. When alarm input #2 returns to the normal
state (closed) then the action DBASE 1 System CLEAR creates a database entry for camera 1 being
in the CLEAR state.
Similarly, the expression:
F = ACTIVITY(4).EXTEND(3): means that when momentary activity is detected on camera 4 that this
brief trigger will create a condition that lasts at least three seconds, and if more activity occurs it re-
triggers without creating a new event
Actions (active) REC(4) E: means that when the above condition occurs camera 4 will be recorded
using the EVENT profile
Actions (Inactive) REC(4) N: means that when the above condition ends camera 4 will be recorded
using the NORMAL profile
You can have more than one action, by separating the actions with a semi-colon.
The 'left-hand side' of the expression can be any unique label. In the above example "A", "B", "C"
etc are used but the label can be anything as long as it is unique and does not clash with other
labels.
Clear: Clears all currently programmed alarm expressions.
Restore: Restores all previously cleared alarm expressions.
Validate: Checks for any illegal values / none existent variables / names.
Commit: Saves the listed expressions
Show User expressions Only: displays only expressions which have been created manually and not
by a wizard.
NetVu Ltd. www.netvu.org.uk
No 1 Thellow Heath Park, Northwich Road, Northwich, Cheshire. CW9 6JB
Advertisement
Table of Contents
