Alarm Circuits Guide

Author: Ari Erenthal, Published on May 09, 2017

Alarm circuits are a fundamental element of wired burglar systems. Designing the alarm circuit greatly affects its performance. In particular, more efficient circuit designs introduce less resistance and cause fewer false alarms. In this note, we examine:

Alarm Circuits Overviewed

  • ******** **********
  • *** ** ***** ******* *****
  • ***** ** ******* *** ******* ********
  • ********* ** ********
  • *****
  • ***** *******
  • *** *******
  • ******* ********** **************
  • ******** ** ******
  • ********* **********
  • *** **** ********** ** *** ****?
  • *** **** ******* ** *** ****?
  • ***'* ***

***** ******** *** ***** ******* ** ***** ***** *** ******* sensors. **** *** ******* / ********** ** ***** ***** ** broken (*.*., ** ******* ****** *****), *** ***** ** ********* if *** ****** ** ***** / *******.

How ** ***** ******* *****

** ***** ******* ******** ** * **** ** ***** ******* from ** ***** ***** ** * ******, **** ** * magnetic *******. ********** ****** ***** **** *** ******** ********, **** one ****, *** **** *** ******. **** ********* ****** *** sensor ** *****, ** ********* *** *******, ******** *** ****** to **** **** *** ***** **** *** **** ** *** negative ******** ** *** *****.

** *** **** ** *** *******, *** ******* ** ******** because *** ****** ****** *** ***** ** *****, ******** ******* to **** **** *** **** ** *** ******** **** ** the ******* ** *** **** ** *** ******** ****.

***** * **** ** ***** ** ******* **** ***** ** the ****** ** **** ********* ** *** ***** ******* * large ******, ***** ** ***** *** **************** ****. *** ********* **** ****** *** ****** **** *******, from *** ******** ******** ** *** *****, ******* *** ******, and **** ** *** ******** ********. ******* *** ****** **** cause *** **** ** ********, ***** **** ***** *** ****** and **** *** **** ** *********. ** ***** *****, ******* a ****** **** ****** ****** *******. ** ** **** **** ******* **** ****** ** ***** condition.

Loops ** *******

*** *** **** ****** **** ** *** ******** ******* ** circuits ** ** *****************.

***** *** ********* ******* ** ******* * ***** *******, ***** means **** **********, ***** ****** ** ******* *** ****** ** install. *******, ***** *** **** ********* ** **** ** *** construction ***** *** ********** *** *** ******* ** *** ***** and ***** ******* *** ****** ****** ****** *** ******* ** installed. ********* ******** ************ **** *** ******* ********** ** *** carpenter. *** ***** ******* ***** ** ** **** ** ******** a ********** ** ******** *** ****** ****** *** ******* **** is ********* ** ***** ********** *******, *** *** ********* ****** be **** ***** ** ***** ***** ** *** ******** ** window *****.

******* ****** ** ********* ******* **** *** ********** *** *** more **** ********* ** *******. *******, ****** ****** ** ******* homes ** ********** ********* ******* **** ***** ** ** *** feasible ** **** *** ******** ** *** * ****** *******.

*** ***** ** ******** ******: ***** ****** *** *** (**-***-***) splice. *** ******** ** ***** ******* *** ***** ***** ******* resistance *** ***** **** ****, *** ** ******** * **** skilled ********** ** **** *** ******. ** ********, *** ******* are ****** ** ************, **** ***** ********* ****** ** ******* and **** *** ** **** ** * **** *********** *********, but **** **** ****** ***** ******* ********** *** ******* ** installer ** **** *** * **** ** **** ********** ******.

Loops *********

*** ***** ***** ***** ** ******* ** * **** **** allows *** ******* ** ***** * *******. ******* ****** *** top **** ** *** ****** **** ** ****** *** ***** window ** **** ****** **** ***** *** **** **** ** open. ** ********** ****, * ********** **** * ****** **** from *** ******* ** *******, ******** *** ******* ** ****** around *** ******* ** * ******. *** ********** ****** * loop ** ***** ******, ***** **** ***** *** ******* ** one **** ** *** ******* *** *** *** *****.

*** **** ** *** **** **** ** *** ****** ** the *****, *** *** ***** **** ** *** ****** ** the ****. *** ********** *** *** ***** ** ***** **** one **** ** *** ******* ** *** *****. *** **** of *** ******* ** *** *** ***** ****** *** * loop ******* ** *** **** ** *** ******* ** *** left (***** ** ***** *****). *** **** ******* *** *** left ******* *** *** ****** **** ******* (***** ** *** below) ********* *** ******, ** **** ** *** *** ******* are ******.

Field *******

* ***** ****** ** *** **** ** **** ** *** device *** ** *** ****, ******* ** *** ****** ******. A ******* ********** *** **** * ***** ****** ** *** conditions *** *****. ******* **** ** ********** *** ****** ***************, so * ***** ****** *** **** ** **** ** ***** is ********* ** **** **** **** **** ****** ****. *** example, **** ****** *******, * ********** *** ****** *** **** to *** ********* ** *** ***** ** ********, *** ** sight *** ****** ***** ** ** *********** ***** **************. ***** installers ******** **** *** ****** *** ******* ** * ******** to * ****** *******, *** **** ***** ******* ****** *** siren ***.

** **** *******, * **** ** ***** (*****) ** ******* to *** ***** *****. *** ***** *** ******* ** ******** contacts ** *** ****** **** *** *** *** **** ** the ***** ******, *** **** ***** *** ******* ** *** top **** *** *** ****** **** ** *** **** ******. One *** **** ** ******* ** *** **** ****, ******* one *** **** *** *** **** **** ** ** ******* to *** ***** *****.

ITB *******

*** *******, ****-***-**********, *** ***** ********** *** ***** ***. ******** ***** *** *** ** **** ********** *******, *** they *** **** ****** ** ** *** ***** ***** * splice.

*** ******* *** **** ****** *** ************* ***********, *** **** faster ** **** **. ****** *** *******, *** ***** *******, to *** *** ******* ** **** *****, ** ****** **** making * ****** ** ***** *********** *** **** ******** *** how ** **** **** ****. **** *** **** **** ****** to ************ ** ******** ******* ** *** ***, ******* * troubleshooter *** ******* ******* *** ******* ****** ******* *** *****, and **** *** **** ** ***** **** *** ******** *** splice. *******, ******* ********** ***** ** **** **** ***** *********, and **** **** ****.

Circuit ********** **************

*** ******* ** ** *****, ********* ********* ******* **** ** contacts, ******* * ******** ****** ** ****** ******* ******* *** wires ** * ******** ***** *** ******** ** ** **** not ****.

***** ******* *** * *******, *******, *** ********** *****:

  • ******* ** ******** ** ***** (*).
  • ******* ** ******** ** **** (*).
  • ********** ** ******** ** **** (Ω).

********* * *********** ** *** **** *********** ** ********* *** use. ***** ****** ***** *** ****** ** ******* ** ******** to *******.

  • ** ***** *** *** *****, *** ****** **** ****** *** power ** ** **** **** ***********.
  • ** ***** *** **** *****, ** **** ****** **** **** or ********.

********* *** ******** ** ***** *** ****** *****. *** ******* consume, ******, *********** ** * ************* ****.

  • *** ****** **** *** ***** *** ****** ** **** ****** to **** *******, ***** ***** ***** ** ** ****** **** down, ********, ** **** ***********.
  • *** **** **** ** *** ******* ** *** ****** ****** draw **** ******* **** ** *** ***.

********** ** ******** **** ***** *** *******. ******* **** ******** resistance ***

  • ****** ** ********* *******
  • **** ******
  • *******
  • ****
  • ****** ***********

*** **** ********** ** * ******* **** ***** *** *******, making ** **** ********* *** *** ***** ** ******* *** zone ********. ***** ********** ********* ** *** ******** ** **** goes **, ********** ******** ******** **** * **** *********** ** causing ***** ****** ***** ***** ***** *********. *********, ***** ****** should ** **** ** **** *** ********** ** *** ** possible.

Parallel ****** ******

*** *** ******* ** ******* ******** ******** ** * ****** circuit *** ******** *** ******. ******* *** ****** ** ******* ************ ********** **** *****. ******** ***** ******** ******* *** ****** ******** circuits, *** ******** ***** ****** ******* *** ****** ****** ********.

** ******* ******, *** ** *** **** ** ***** ** ******* ** one *** **** **** **. **** ***, ** ****** *** many ***** ** ***** *** *****, *** *** ****** ** two ***** **** *** ****** ** ******* ** *** ***** terminals. ** *******, **** ** ***** *** ******* ** **** other. **** ***** *************** *******, ******* * ********** *** ****** test * ****** ****** ** *** ******* ** * ****. Series ** ********* **** *** ********** * ***** ****** ** devices ** * *******. ** ** ****** *** ****** ** wire **. *** ******** ** **** ****** ********** * *** more ********** ** *** **** ******* *** *********.

** ******* *******, *** ***** **** **** ****** ** *** ******* **** be ******* ******** ***** *** ***** *** ******* ** ******** are ****. ***** ****** ********** **** ** ********* ** *** screw *********, ***** *** ******* '****' ** *** ***, *** connected ** ******** *** **** *****. ** ****** *** **** devices *** ***** *** ********* ** *** *******, ***** **** always ** **** *** **** ** ******* ** *** ******** and *** ** ******* ** *** ********.

******** ********** ********* **** *** ********** * ***** ****** ** ******* to * ****** *******, ** *** ******** **** **** **** of *****. ** ******* ******* *** ****** ** **********, ******** those ***** ******* ** ******* ** ** *********. *******, ** is ****** / **** *********** ** *********, **** *** **** if **** ***********, *** ** **** ********* ** ************ ***** on.

** * ******** *******, *** *** ******** ***** ** *** wire ***** *** ****** ******* ********, **** *** *** ****** being *** ***** **** ******. **** *** ** * ********* to ******* ** ***** *********. ** ***** ** ************ *** wire ***** ** * ****** ** *** *******, * ********** must ***** **** *** ****** ******.

*********** ***** *********** ******* * '****' *** **** ** ****** devices ** ******** *** **** ** ****** ** ******. *******, the *** *********** ** ****: **** * ****** ****** **** result ** *** **** **********, * ******** ****** **** ** used. ****** ******** ********, *********** *** **** * ******* ** order ** ********* *** ****** ** ********** *******.

Measuring **********

********** ** ******** ***** * ******* **********, ** ***. ** measure **********, **** *** ******** **** ** ***** ** *** Ω (****) ******, *** ***** *** ***** ** *** **** wires ** *** *******. *********** ******* ********** ** ***** **

  • **** **** *** ******* ** * ******* *** *********** ********
  • ****** ******* ** **** ******* ** * **** ** ** split **** ** ***** ******** *****
  • ****** ******* * ******* ****** ** ***** ** ****** ** in ********
  • ****** * ******** ********** ** *** **** ** ************
  • ************, ** * **** **** * ********** ******* **** **** baseline *** ******** * ****** **** ** ********* ******

How **** ********** ** *** ****?

***** ** ** ***** ****** ** *** ******* ****** ** devices, *** ************ *** ******* ****** ** **********, **** ****** be ********* ** * ****** ********* *******. ** * ******* rule ** *****, **** ********** *** ** **** *** ******** resistance ** * ****** ******* ** ~**Ω. ******** **** *** resistance **** ********** ***** ** **** ****, ********* ** *** number *** ****** ** ******* ********* ** *** *******, *** number *** ****** ** ******* ** *** ****, *** ***** composition ** *** ****, *** **** *** ***********, ***** ***** cause *** **** ** ******* ****** ** ******. *** ********* animation ***** *** ******* ******* *** **** ******* *** ***** to *** *******:

********* ***** ***** ************* **** ********* ********* *** **** *********** an ***** *********, *** *** ***** ********* *** ***** ** the ***** ******* *** ********** ** * **** *******. ** a ******* *** * ******* ************* ****** **** **Ω, ******** either ***** * ******** ****** ** ********* *** ****, ******** some ******* **** *** **** *** ****** **** ** * new ****.

**** ********** ****** *** ******* ******* ** ****** **** ** decide ** ***** *** **** ***** **. ** ******* **** been ***** ******** ***** **** ***** ** ***** *******, **** is *** ********.

How **** ******* ** *** ****?

** ******, ** ********* *** ******* *** *** ***** ** a ****** ****, *** *** ******* ** ******* ****, *** the ****** ********* ** * ***** ****, *** ** *****. However, **** ** ***** ** *********** *** ** ***** ** alarm. *** **** ******* *** ** * ****** ****, *** harder ** **** ** *** *** **** ** ****** *** which ****** ** ******* *** **** ** ** ****.

** *** *** ******* ** * **** *** ** * single ****, *** **** **** **** ** ***** *** ** them ****** ***** **** ** *** *** ******. ** * user ***** ** **** * ****** ****** **** ***** ****** the **** ** *** ******, **** ***** **** ** ****** all *** ******* ** *** ****, ***** ** * ****** security **** **** ****** ********* * ****** ******. ** ******* station ***** ** ******** ****** ** **** ** *** ****'* site, **** **** **** ** **** ** **** * ***** description ** *** ******** ** *** *******, *** * ******** location.

**** ****** *** **** ****** * ******* ****** ** ***** out ** *** ***. ***** ********** ***** ******** ********** *** installing **** *********, ***** *** ** *** ******* **** ** the ************. ***** ******** **** ********* *** ******* ****** * second ***, ***** ******** **** ** *** ****. *** ******** of **** ** ******* ******* ** * ****** **** *** when ** ******** ******* **** ******** ***** *** ** **** answer, *** ******* ******* **** **********.

Wiring ******

****** ****** ** ******** ********* **** ****** ***** ***** *******.

  • ****** *** ***** ** *****, *** ***** **** *** ***** alarm *******
  • ***** *** * ******* ** *** **** * ***** * device*******
  • ***** * ******* ** *** **** ***** * **********
  • **** ****** *** ***** ** ** *****

**** ****** **** **** * ****** ***** ******. *******, **** applications **** *** *** ****** ** ** ***** ** **** sirens **** ** ******. *** *******, * ***** ******* ******* would ***** ******* ****** ** ******** ** * **** *****, but ***** ** ********* *** ************ ********. ** ***** ** have ********* ******* **** * ****** ******, ********** *** ****** to **** ****** ** ****** ******** (*** ****** ******) ** in ****** (*** ***** ******). **** *** **** ****** ** wire **** ****** ** ******** *** ***** ****** ** ******. The ****** ** ****** **** **** ********** **** *** ****** in ********, ** **** ***** ** **** **********, *** ********* fewer *****, ******* *** ***** ** ***** ** * ***** volume.

***** ***** ****** ** * ******* ************ ** ***'* ***.

Ohm's ***

************* ***'* *** ***** ***** *************** **** ******. ***'* *** states **** ***** ** * ****** ************ ******* *****, ****, and ****, ************ **** ***** ****** **** ***** ****. **** is **** ******* ** *****, *** **** ** ***** ******* by ****. ****** ********** (****) ***** *** ******* (****) ** down, *** ****** ******* (****) ***** *** ********** (****) ** down.

*** ******** *** ** ******** ** ******* *** ***** ********* to *** ***** ** ** ******* ** ******** *** **********. This ****** ** ****** *** ****** ** ********* *****, ***** in **** ******* *** ********* ** *** *****.

************* ***'* *** *** **** * ********** ******** *** ****** power ********, *******, ********, *** *******. ******** * ****** **** series ** ********, ********* * ***** ****** *** *** **** outputs *** **** ******* ** * ****** ********, ** ****** a ******** *** *** ****** ******* **** ** ********* *** once **** ********** *** ***'* *** *****.

Comments (9)

**** ****! **** ****.

**** ******

*** ***'* ***** ********** *** ******* ******* *****. ***** *, Class *, ***** *, ***** *

******, **** ***********

**** *** **** *** **** ***** *** *********, ******** *****

*** ** ****** ********** ***** **** **** * ******** ******** or ******

*'* ***** ********* *** *** **** *** **** ** *** picture ** **** *******. **** ** **** * **** *** a ****, ***** ** ****** ******* ** *** **** * system, *** *** ******.

*** ****** --> *** ****. ** *** **** ** ***** I **** ***** ***** **** ****. **** ***** *** ***** series ***** **** ** **** * ******* ***** ****** *****, and **** ***** *** ******** ***** ****** ******* *** ***** sabotage *****. ** **** ** *** ******-****** *****, *** ***** ever *** ********* ** ******. ********** **** **** ********* *** cheap ** ****. :)

* ***** ***** **** * ****** ****** ** * ****** zone ** *** ******** *** **** ******. *******, ** ** not ****** *********, ** ** *** ****** ********, ***, *** to *** ***** **** ** ************* **** **** *** ******** this *********, ** ** ********* *** ********** ** ********** *****-****** circuits ** ***** ** ************ ****.

*****, ** ** *** ****** ********* ** ******** * ****** zone ** ***** ****** ****** **** *** **** * ***** number ** ******* ********* ********. *** *******, *** ***'** *** a **** ** ****** **** *******, **** ****:

*** ***** *** *** ***** *** ******** *** ***** ** each *******, *** ** ***** ** *** **** ********* *** the ********* *** *** ****** ** *** **** ** ******** a ****** **** ** *** ******** (*** *** **** *** the ******** ********** ********). **** ***, *** ***** **** ***** have ** ***** ** *** ** *** ** *** "****** room *******" **** **** ******* ** ****** ** ******** ***** window *** ****** **, ** **** **** ***.

******, ** ** *** ****** ******** ** ******** ***** ** every ****** ******. *'** **** ********** ****** ** ***** ***** well ****** **** ********* **** ***** ** **** *********, *** even *****, *** ***** ***** *** *********** ****** ***** ** dedicate * **** *** ***** ******. *** ***** ***, *** example, *** **** *********** ** *****- **** **** ****** *** a ***** **** *** *** ***** ****** *** * ***** one.

*'* ****** * ********* **** ********** *** '*******' ****** ** windows ** * *****, *** **** ******* *** ****** ******* ************ *** ******* *,*** ****** **** ***** *** ** ******* on *******, ***** ****** ***** ***** ** **. ** ***** windows *** ****** ****, ****'* ** ******** ********, *** ********* glassbreaks, *******, ** *****.

*'* ***** **** ****** ****** *****, *** **** *** **** expensive **** *** ******* ****.

*****, **** ** *** *** *** ******** ***** *****- *****, again, ** ****** *** **** *** ** **, ** ********- there ** ** ******** ****** ** ***** ******* ********* *** in ***** **** **** ******** ****** **** ********* **** ******. Therefore, ** ** ********* *** ** ***** ********** ** **** and ********** *** ** ************ ***** ***** *******, ***** ** many ***** *** ***** ********** *** ***** ********** *** ** the **** ** * ********** ********.

************ **** ** ******, ** ***'* **** ***** "*********" **** windows :) ** * ****** *** ** *** *** *** us. *** ** **** ****, * ***** **** *** ****, and **** * ******** *** (**** ******) **** *** ** done ** *** ****** ****, *** *** **** ** ******* (from ********) *** *** **** ******, *** * **** ****.

** *** *** ****, ** **** ***** ******* ****** ** panels *** ****** *****, *** ** *** **** ** ******** an ***, ** *** ** ****. ******* **** ** **** several **** **** "*** ******" **** ******** **-***-*** **** ***** panels ****, *** ***** ** ******** ** **** ** ****** them ****** * *******. * ** **** ***** ** ****** 100USD, **** ** ***** *******, *** **** ****** ******** ********. If *** **** **** ** ** ***** ****** *** ******. The ******* ******* ** ****** ******. ** ****** ***'* **** to ***** *** **** *****, *** *** ******* ** ***** like *** ********* *****.

***% ***** *** ***** ****, *** *** *** **** ** the **** ***.

** * ****** ******* ********** ******* ** ********* ********* ** the **'* ****** ******** ******* ** *** ******* ** ***** aggravating **** ****** ** ************ ***** ******, ********** *** *** window **** ** ****** ****. *** **** ******* **** ********* back ****, *** *** ***** ***/*** ***** ****'* **** ******. In **** *** *** *** ***** ****** ** ** ****** for ****** **** **** *** ****** ** * **** ***** than *** * ****** ****. **** ********* ****'* **** ********* and ******** ** ********* ******** ***** **** ********** *** ******* life. * ********* ** ***** *********** ****** ** **** ** years **** ****** *** *** ** *** **** ********** ********* and * ********* ********** ****** *** *** *******. *** **** a **** ** *** ****. *** ***** *** **** **% gutted ** *** ******* *** * ********* ** *** ***** had ** **** ***** ******* ******** *** ***** *** *** fact ***** *** *** *** ************ *** ** *** **** a *** ******* **** ****. ** ***** ** ********** *** wired ********** ** * ****'* **** *** **** ********** ** come *** **** * ***** ***** ******* ******* *** **** to ****** *** ***** *** ** *** ** * ******* of **. **** * *** *** ****'* ** **** ****** as ****. * **** *** ***** ***** ********** **** *** so **** ***** **** *** ** **** ******* ***** ******* I **** *** ****** ** **** *******. **** **** *** new *** ******* ****** *** ***** ****** ** ** **** to *** ******** *** * ***** ****** ******* ******. **** knowledge *** ***** *** ***'* **** *** ** ****** ******** though. ******* **** ** *** *****.

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