Re: Vista 20 and IR motion problem

["Bob Worthy" <securinc@xxxxxxxxxxxxx>]

"Robert L Bass" wrote in message

> >>  When it's armed, passing by the detector near the top of
> >> the stairs disarms the system. Other motion detectors, glass
> >> breaks and contacts protect the home in the
> >> usual manner.
> >
> > How can the other devices protect the home when passing by the detector
at
> > the top of the stairs (descending) disarms the system?
>
> If it's disarmed they don't.  The second method bypasses the motion
detectors
> if the client descends the stairs.  If no one goes downstairs at night
they
> remain active.

So the second method is really the only method that should be considered
since the first method actually disarms the whole system. At least that is
what I am understanding from the first sentence of your top post here.

> > A solution that if one where to come downstairs in the middle of the
night,
> > started to watch the late show and drifted off, has now left the home
> > unprotected.
>
> If one were to come down at night with any other design one would also
have to
> bypass the motion detectors.

Yes I agree, however your first method stated that it arms and disarms the
system, so maybe that one should not be consider.

> > Then there is the scenario of two people passing each other in the
stairwell
> > which could lead to either a false alarm
> > or a system that didn't arm because of an open zone depending on who
crossed
> > which motion first. Hmmm.
>
> If there was someone downstairs at the start they would have already
disarmed
> the system

On your first method, someone downstairs ascends the stairwell with the
system disarmed. They pass someone in the stairwell descending, who under
your method armed the system by passing through the motion at the head of
the stairs. The person ascending the stairs now disarms the system when he
reached the top of the stairs. Each are passing motions hence competing for
status....I guess with followers, forced arming, delays or some other
features it would work, but if it is arming and disarming the system each
time someone goes up and down the stairs during the day there will be
issues. Bypassing motions probably should be the extent of it.

> Nice try, Bob.

Can't blame someone for thinking before applying.