[Hai-users] Preventing false alarms

[Thomas Brewster]

I would be interested in hearing what other people had to say on this 
subject as I am not an expert.

But I am assuming that you could set a flag on the first event (window / 
door)
Then you use a startment that would set off the alarm when the flag was set 
and the second event occured (motion sendson / etc).

It has been a while since I looked over my HAI programming so please forgive 
me if the terminology is not correct.


----- Original Message ----- 
From: "David Harper" <dharper at chiaro.com>
To: <hai-users at tssi.com>
Sent: Monday, July 18, 2005 10:01 AM
Subject: [Hai-users] Preventing false alarms


> This past week I was away on a trip when the alarm went off.  The police 
> responded and my neighbor let them in to check things out.  They found 
> that the alarm was caused by a motion sensor that was going off 
> intermittantly.  When they checked the sensor, they stood and watched 
> while a moth that had got into the house buzzed around the sensor and was 
> setting it off! Removing the moth cleared up the problem and the alarm was 
> reset with no further problems.
>
> About two months ago I had another problem where a window sensor failed 
> and set off the alarm.  The alarm company can tell what has tripped the 
> alarm, but they don't make any judgement calls; if the alarm goes off they 
> call the police.  So what I'm wondering is if there is any way that I can 
> set up the system such that it takes a combination of sensors tripping to 
> actually set off the alarm.  Something like at least one external sensor 
> (window, door or glass break sensor) PLUS at least one internal sensor 
> (motion detector or an internal door) going off within five minutes of 
> each other.  This combination seems like it would be something that is 
> unlikely to happen accidently and would give a much higher level of 
> confidence that the alarm was legitimate.  I went through the manuals when 
> I got back this weekend but didn't see anything that indicated I could do 
> this.  Is something like this possible?  If so, how would I go about it?
>
> thanks,
> Dave
>
> ---------------
> Dave Harper             Chiaro Networks
> 972-739-7919 (voice) 251 Renner Pkwy.
> 972-739-8020 (fax) Richardson, TX 75080
>
>
>
>
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