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Re: Non-Comfort Alarms
- To: ukha_d@xxxxxxx
- Subject: Re: Non-Comfort Alarms
- From: Kevin Hawkins <tivo@xxxxxxx>
- Date: Thu, 12 Jul 2001 00:09:02 +0100
- Delivered-to: rich@xxxxxxx
- Delivered-to: mailing list ukha_d@xxxxxxx
- Mailing-list: list ukha_d@xxxxxxx; contact
ukha_d-owner@xxxxxxx
- References: <9iikn3+oc3k@xxxxxxx>
- Reply-to: ukha_d@xxxxxxx
Title: [ukha_d] Re: Non-Comfort
Alarms
I'll
have a shot as i'm just waiting for a download t complete - Newcastle
accents take a bit of getting used t -
James
had an old alarm system and he deduced which were the wires that
actually went t the sensors (eg the passive infra red detectors). He
then used a chip called a CD4050 which converted the voltage that the
panel expected t see int a standard level that most electronics use
, probably +5V and Ground. This is a bit like using a relay or
an opto isolator that I talked t you about in my previous message.
The 8255 PIO (Parallel input Output) is simply a chip that has a load
of inputs (probably 8) each of which can be interrogated by your
computer. So he has effectively just linked the PIR outputs int the
PC as well as the panel simultaneously.
I
haven't actually found out if you have a home automation controller -
are you running some PC software for this ? Obviously you have t get
the information from the Alarm panel int your controller - if you are
intending to use a PC as your controller then this restricts in a way
how the information can be transferred. I think your original hope -
and actually the neatest solution is a serial (RS232) interface.
Otherwise each input has t have it's own wire t the PC - effectively
a parallel data transfer. The PC does not have a nice way of taking
parallel information in (it's not impossible it's just not nice). It
gives parallel out through the printer interface port. Some
electronics are needed t interface back in a parallel way and that is
what James did - the 8255 gives the PC a parallel interface input. ( I
know modern parallel ports are bi-directional before someone jumps on
me).
Let's
wait & see how you get on with your plea t Scantronic for info -
& then tackle the options. If we have t deal with a parallel data
interface then an external controller like HomeVision would do this
with ease, or we need t be cute with the electronics interface to a
PC. some people also make parallel t serial convertors that work with
some HA applications. Have you a budget in mind - a more capable panel
is another option that would certainly solve this problem at lower
cost than say a HomeVision unit - but the HV would give far greater
control options for later if you intend t get into Home Automation
seriously.
What's
your current setup ?
Kevin
Does anyone know of a babelfish that
will interpret this? :)
Today I bought "Electronic Project Building For
Beginners"
and "Practical Remote Control Projects" maybe that gives you
an idea
of my practical electronic experience (I think I used t know
plenty
of theory)
One day I'll understand what half of you lot are talking about.
Can
we not go back t queries in MS-Access where I'm on reasonably
firm
ground!!
If you can break this down t words of one syllable it'd be much
appreciated.
Mark (feeling very stupid)
--- In ukha_d@y..., James Derrick <james@a...> wrote:
> On Mon, 09 Jul 2001 10:40:40 -0000, you wrote:
>
> >Has anyone got any experience of interfacing with Alarm
Systems
other
> >than comfort ones?
>
> I have the remains of a system used for years in a previous
house. I
> simply traced the zone input circuits (typically large
resistors,
and
> a supression cap), worked out which was a supply rail and which
was
> the signal t the controller and added a wire t a CD4050
level
> shifter/ buffer. This was then linked up t a 8255 PIO board in
a
PC.
>
> This worked a treat- the panel worked normally, and the PC
had
> independant monitoring of all inputs and outputs.
>
> TTFN,
>
> James
> James Derrick james@a..., Cramlington, Near
Newcastle, England
> Beyond the Horizon
of the place we lived when we
were young,
> In a World of
Magnets and Miracles. Pink Floyd.
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