Specifications

36 Multivision® Pro Installation and Operation Manual
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 connect 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.
MOTION ALARMS