HWM COMLog 2 IS Quick Start Manual page 10

Tap on "Tamper Alarm Combo" to set up the tamper alarm.
(This activates IDT to make several changes to logger settings in
order to produce a Tamper Alarm).
The tamper alarm settings are shown below (a) and (b):
(a)
A new channel is
created measuring the
open-circuit time of
input Status2 (/ Flow2).
The channel input is
tested every 2 seconds.
The channel is not
logged.
The tamper input is
not replicated to any
output channel due to
the "Replicate channel"
control being switched off (see diagram).
(With this setting is not available for use by other equipment).
(b)
There is an alarm condition set up
(via a "Combo" condition test).
The test checks the last 20 samples.
The OK condition (non-tamper) is for a closed-circuit to be
present; the time of an open-circuit condition is to be "0".
The settings opposite create a trigger condition as soon as
a single measurement shows an open-circuit condition
exists.
The Action taken is to immediately report the alarm (to the
server). It is to report it as a tamper condition.
(Functionality and settings in the server determine if the
alarm is just recorded, or if it is actively forwarded to alert a
user).
When the triggering condition no longer exists, the logger will also send an "alarm cleared"
message. However, this will be sent when the unit next calls in to the server, not
immediately.
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