Bosch LTC 8500 Instruction Manual download pdf (Page 53)

Alarm Relay Response

EN | 43

15.7 Alarm Relay Response

Allegiant alarm responses include the ability to trigger isolated alarm relay outputs

from an LTC 8540/00 Alarm Interface unit. An alarm output is typically used to

activate the alarm input of a security Digital Video Recorder (DVR) or other alert-

ing device. In this type of scenario, a DVR is programmed to change recording

speeds from a slower rate to a faster rate upon alarm activation. Operation of the

relay outputs from the LTC 8540 Alarm Interface unit depends on the system con-

figuration for responding to alarm events. The alarm output relays behave according

to the following conditions:

1. Relay 1 activates if the system uses the Basic alarm response mode and an alarm

occurs on any system monitor. Relay 1 deactivates after all alarms have been

removed from the inputs. Relay 1 also deactivates if the system (monitor or

alarms) is disarmed by an operator via the keyboard. Pressing [Acknowledge]

on the system keyboard does not deactivate Relay 1 since the alarm video fol-

lows the contact applied to the unit in this alarm response mode. Other relays

are not used in this mode.

2. Relay 1 activates if the base system is set to use the Sequence & Display alarm

response mode and an alarm occurs on any system monitor. Relay 1 deactivates

after all alarm videos have been acknowledged (by pressing the [Acknowledge]

key) via system operator(s) from all system monitors. Relay 1 also deactivates if

the system is disarmed (either the monitor or the alarm(s)) by an operator via

the keyboard. Removal of the alarm input does not deactivate Relay 1 since the

alarm video(s) are not dependent on duration of the contact applied to the unit

in this alarm response mode. Other relays are not used in this mode.

3. If the base system uses the Autobuild alarm response mode and an alarm occurs

on system monitors, the relay corresponding to the monitor number activates

for the duration that the corresponding alarm input is applied to the unit. The

relay deactivates if the monitor associated with the relay or if the alarm(s) being

displayed on the monitor is disarmed by an operator via the keyboard. Pressing

[Acknowledge] on the system keyboard does not deactivate the relays since the

alarm video follows the contact applied to the unit in this alarm response mode.

4. If the Alarm Group table screen, in the PC- based LTC 8059/00 MCS package

or the LTC 8850/00 GUI Software, contains an alarm group that includes mon-

itors and the monitor option has been selected in the Relay Action column, the

corresponding relay activates for the duration the alarm video remains on the

monitor. The relay deactivates if the associated monitor (or the alarm(s) being

displayed on the monitor) is disarmed by an operator via the keyboard. Pressing

[Acknowledge] on the system keyboard does not deactivate the relay unless this

feature has been selected for the associated alarm group. If the Monitor option

has been set to 1 in the group table, only Relay 1 activates when monitors in

that alarm group become alarmed.

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Bosch LTC 8500 Instruction Manual Page 53

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