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From: "Douglas J Petican"
Subject: Re: Security System Sensors
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Date: Thu, 31 Oct 2002 09:58:53 -0500
NNTP-Posting-Date: Thu, 31 Oct 2002 10:00:00 EST
Organization: Cogeco Cable
If I understand correctly, the 24HR loop is used when the alarm system is
deactivated to detect tampering with the system? Are all the sensors wires
Wouldn't NC as oppose to NO sensors achieve the same thing? The response to
an open circuit would then depend on whether or not the alarm system was
activated. In other words always monitor the sensor loops. Although the
difference between tamper and alarm would be blurred, but from a practical
view isn't that the same thing?
Do sensors come in just 4-wire versions?
Thanks, Doug Petican
"Dave" wrote in message
> Hello Douglas,
> The 24 hr loop is simply a continuous loop around the system. If anyone
> attempts to disable the alarm during the daytime (or whenever the alarm is
> not set) by cutting the cable or removing a cover this loop is broken and
> sounds an internal alarm. I hope that made sense.
> "Douglas J Petican" wrote in message
> > I'm working on the design for a security system. I've noticed that
> > sensors have 6 terminals: 2 for power, 2 for NO/NC connection, 2 for
> > connection.
> > What does the 24HR connection do?
> > Thanks, Doug Petican
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