Re: Vsita 15P programming question

["Robert L Bass" <robertlbass@xxxxxxxxxxx>]

> Thats not exactly the situation I presented. I should
> have added the word IF...what trouble are you going
> to detect IF a window/door is opened in a loop with
> multiple switches and the EOLR at the proper position
> (in a closed loop alarm circuit - switch opens in
> alarm). My point is you're not supervising too much
> in this case.

I think I understand what you're saying.  Correct me if not.  Let's examine
what will happen in that situation.  The EOLR is at the last device in a
multi-door loop.  The alarm is disarmed and a door is open somewhere other
than at the end of the loop.  Next the wire is shorted across the EOLR.

In that scenario, the zone will still show open until the customer closes
the open door.  At that time it will either continue to "show zone" open or
it will display "zone trouble", depending on the system and the way it's
programmed.  Either way, the client will be unable to arm until he remedies
the situation or manually bypasses the zone.

If the same series of events were to occur without the EOLR the system would
initially show "zone open" until the door was closed.  However, there would
be no indication that the sensors downstream from the short have a problem.

That is the only difference with a properly located EOLR.  How likely is it
that this situation will develop in a given residential aplication?  I have
no idea.  The only thing that you can be sure of is that with the EOLR there
would be at least a slightly better level of protection.  Whether that extra
protection will ever make a difference on any specific installation is
anybody's guess.

--

Regards,
Robert L Bass

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