Beginner question on resistance

First of all let me once again say thanks for all the good advice I
get here. I know a lot of this stuff is so basic for many of you, but
for me it gives me just enough info to expand my horizons.

Now I have another question that's been confusing me. I have this
wireless alarm panel at home that basically waits for a signal from a
small wireless transmitter to let it know if a zone is closed (normal
condition) or open (alarm condition). Some of these transmitters have
2 terminals where you can physically wire in a multiple magnetic
window contacts (in series)...so therefore you use only 1 transmitter
to monitor, say, 3 windows.

Now many that post on alarm forums say to limit the series wired
contacts to 3 per transmitter...but other alarm guys say you can add
"as many as you want as long as you don't increase the resistance too
much". There aren't any hard and fast rules it seems. I'm wondering
how you will know how many contacts is too many...when the alarm goes
off?? What is "too much"

Basically I was wondering a little about the theory of this. Is there
is a way to measure when say 5 contacts is OK...but 6 is too many?
False alarms can get very costly with fines and all. I welcome your
opinions/advice etc.
Thanks,
Bob
.

Relevant Pages

  • Re: what is the best wire for a perimeter alarm
    ... have his alarm start wailing. ... So I enclosed the transmitter in a metal box, ... The receiver had a light which indicated it was receiving a signal from the ... And this was jamming the real signals so the extender ...
    (alt.security.alarms)
  • Re: Car alarm that goes off when in a certain distance
    ... I would like to be able to set up a alarm on a car. ... I used a ITI transmitter and a Mercury ... switch attached to the input terminals. ...
    (alt.security.alarms)
  • Re: Creating and Destyoying Dialog Box Continuosly.
    ... Why not to use just a simple window? ... better approach would be to show the alarm ... chance for getting the alarm condition for every 10 ms. ... DestroyWindow API. ...
    (microsoft.public.windowsce.embedded.vc)
  • Re: Cryptographic strength in Wireless Alarm Systems?
    ... | Then it is easy to bring a transmitter to jam it. ... Hhahahahahahaa ROFLMAO - ever hear of spread spectrum?? ... locating the interfering transmitter can be more difficult. ... | Wiring a good alarm system is difficult and requires some knowledge. ...
    (sci.crypt)
  • Re: The John and Doug Gun Debate Thread.
    ... By the time the alarm company calls and verifies a problem, dispatches the police, the police arrive it could be 15 minutes or longer. ... it has no effect on the transmitter. ... My younger brother is an electrical engineer, he deals mostly with data, voice and electrical transmissions. ... I am sure that there is something that can jam a radio signal effectively, but in my case it just isn't worth it - there is nothing in my house worth that effort to steal - one reason why I leave the doors unlocked. ...
    (rec.scuba)