Baxall ZMX/BD/10, Operating Instructions Manual

Page: 31 / 111

HBZMXSIB/10/16SD-PR-1 Page 30
3.3 Setting Up The System
This section describes the use of the programming facilities introduced in section 3.
Camera Enable/Disable
If a camera is not installed, then the continual display of the on-screen videoloss
indicator V can distract an operator. In addition, unnecessary time must be spent to
remove the camera from the sequence lists and the record lists. The multiplexer
takes care of this situation with one setting.
The multiplexer allows the user to set inactive cameras as DISABLED via a menu
setting, so that videoloss indications are not shown. In addition, disabled cameras
are automatically removed from all programmable sequence lists and the Record list.
Besides being used for cameras which are not installed, this feature is also very
useful when a camera is undergoing maintenance, or has a temporary fault.
Note
The disabled setting does not affect cameras shown on Monitor-A during PLAY
mode.
Recording
RECORD mode, is selected by pressing the RECORD key .
Record Mode on Simplex and Duplex Multiplexers
On a simplex multiplexer, RECORD mode is one of the three possible modes.
RECORD mode must be activated by pressing the RECORD key .
On a duplex multiplexer, RECORD mode is always active in the background. It is not
necessary to press the RECORD key since multiplexed recording will continue even
if LIVE mode or PLAY mode are selected.
How Multiplexed Recording Works
To record several camera inputs on one video output, single images are digitally
captured from each of the video input channels and then stacked consecutively to
form a continuous video signal of time-sliced camera images. The time-slicing of
several inputs onto one output is generally known as Time Division Multiplexing
(TDM). Time base correction is performed during digital capture and so input
cameras need not be synchronised.
The order in which the images are captured from the different input cameras is
controlled by a user-programmed VCR record list (see page 31), which can be
automatically modified by the system in the event of alarms or motion detection.
Main Camera Enable