Re: another newbie, what to do with this Brinks alarm system?

["Roland" <roland@xxxxxxxxxxxx>]

Don't buy it. There are lots of folks that like the old Radionics way of
using N/O loops instead of N/C. Put the hemos on there and then be ready to
plug your ears.

"Todd H." <t@xxxxxxxxx> wrote in message news:84irhwi1qf.fsf@xxxxxxxxxxxx
> G. Morgan <alarmpro@xxxxxxxxxxx> writes:
>
>> On 03 Nov 2006 16:08:46 -0600, t@xxxxxxxxx (Todd H.) wrote:
>>
>> >"Crash Gordon" <webmaster@xxxxxxxxxxxxxxxxxxxxx> writes:
>> >
>> >> Basically you throw out the alarm panel and the keypads and buy
>> >> something
>> >> else you can install your self. Everything else should be reusable
>> >> although
>> >> you might have to look for buried resistors if they put them at the
>> >> end of
>> >> the line and remove them.
>> >
>> >Cool--this is sort of what I envisioned.   I did see in the alarm
>> >panel a small pack of resistors just kinda sitting there hanging -- as
>> >though it was something they used as piece parts for whatever reason.
>> >
>> >When you say end of the line, you mean on the sensor end of the line?
>> >And at the risk of asking what may be a FAQ, what purpose do these
>> >resistors serve to the Brinks system?  (I'm new to the security system
>> >hacking realm, but have a strong background in electronics, for
>> >whatever that's worth).
>> >
>>
>>
>> EOLR's are used to supervise the alarm loop.  With a preset resistance
>> on the loop the panel is monitoring the current in the circuit, now it
>> can detect open, close, and partial short -- as well as tampering with
>> the circuit between the control and device.
>
> Ahhh.  Gotcha.  A third logic state if you will.  Makes a lot of
> sense.
>
>> Most residential installers disable EOL supervision in programming and
>> just go for a open/close, that or put the EOLR in the panel which
>> completely negates the whole purpose of the EOLR in the first place.
>
> Oy.   Oh man.
>
>> Think about knocking out a brick under a window and putting hemostats
>> on the wire, BEFORE it reaches the contact and you'll see why EOLR's
>> are useful.
>
> Absolutely.   Easy way to disable the sensor.
>
> Thanks for the education.
>
> --
> Todd H.
> http://www.toddh.net/