Re: Vsita 15P programming question

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

> Yes, you are correct. I was thinking the fault
> would be an open...

An open circuit would only indicate that the door was open (or that the wire
had been cut).

> With only one device on the line, it's highly
> unlikely that the wire would somehow short
> together in the cable...

True, but EOL supervision is intended to protect against deliberate
tampering as well as accidental damage.  FWIW, most alarm techs either don't
bother with EOL resistors at all or mistakenly place them in the panel where
they are useless.  The incidence of deliberate tampering is low enough that
thgis rarely presents a problem.  However, it can and does happen on
occasion, mostly in commercial apps where a dishonest employee may try to
disable the protection.

> Someone might drive a nail into the wall
> or a rat might chew into the wire.

Or a rat may have installed the wire in the first place.  :^)

--

Regards,
Robert L Bass

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