Specifications

36 Video Multiplexer with Video Motion Detection
Chapter 6  Alarms
This chapter describes how the multiplexer responds to alarms and
what can be done when an alarm occurs.
The multiplexer detects and responds to four types of alarm events:
mechanical alarms, motion alarms, recorded alarms and video loss.
A mechanical alarm occurs when there is a contact closure at any
multiplexer alarm input. A motion alarm occurs when motion is
detected at a camera with motion detection (ALRM) ON. A recorded
alarm occurs when the multiplexer detects an alarm encoded field
during tape playback. A video loss alarm occurs when the multiplexer
detects video loss at an active camera input.
MECHANICAL ALARMS
The alarms connector provides one mechanical alarm input for each
camera input. These inputs can be connected to any security device
equipped with either a contact closure or TTL/CMOS standard alarm
output. Each alarm input requires two wires. One wire connects to
the desired alarm input pin. The second wire connects to the
multiplexer ground post (gnd). See Table 1  Alarm Connector Pin
Assignments for details. Alarm polarity is selectable via multiplexer
setup menus. See Menu 3  Toggle Options for details.
The multiplexer always responds to mechanical alarms. The type of
alarm response depends upon whether it is in live or tape mode.
The multiplexer can initiate an alarm when motion is detected at a
camera if this feature is selected during setup. Motion alarms can be
turned ON or OFF for each camera using the motion setup screen in
the camera titles menu. For motion alarms, set the ALRM option to
ON for each camera and time period you want (see Motion Setup
Screen for details). If you want an alarm only when you have both a
mechanical alarm and motion for a particular camera, set the ALRM
option to AND. The multiplexer initiates a motion alarm when a
predetermined number or arrangement of targets are triggered. Each
of the 192 targets is sensitive to changes in picture content.
When a motion alarm occurs, the multiplexer alerts the operator,
displays the alarm camera, toggles TTL/CMOS and contact alarm
outputs and sends images to the VCR on a priority basis. Multiplexer
response to motion alarms is similar to mechanical alarms and depends
on whether it is in live ortape mode when the alarm occurs.
MOTION ALARMS