Lock Status Monitoring Tutorial

By: Brian Rhodes, Published on Dec 18, 2017

Just because your doors look secure does not mean they are. Unless access systems are using lock status monitoring, the doors and areas they protect may not be left insecure. Can you tell whether the door below is locked?  How?

Lock status monitoring addresses a key vulnerability of many access control systems, but its value is commonly ignored or misunderstood. Inside this note, we explain:

  • How Lock Status Monitoring Prevents Security Risks
  • Why Shut Doors Do Not Mean Secure Doors
  • Tradeoffs Of Door Position vs.or Lock Monitoring
  • Typical Solution Cost
  • Examining Latchbolt Monitoring vs Latchbolt Strike Monitoring
  • Explaining Maglock Bond Sensors

The Importance Of Lock Monitoring

Simply put, lock monitoring checks to see whether an opening's lock is reporting itself as 'locked'.  Because most electrified locks can only lock properly when the door is shut, Lock Monitoring tells access systems the door is both closed and secured.

Even with sophisticated electronic access locks, door hardware is vulnerable to tampering. Unless the lock hardware itself is monitored as being locked, tampering can defeat their strength and be undetected by the system. 

For example, electric strikes can be neutralized by placing foreign objects in the strike so the latchbolt never fully engages, or held in with tape so they never extend at all. The image below shows how common trash can be used to prevent the latch from extending into the strike to keep a door locked:

And while maglocks generate large amounts of holding force, it works only when the magnet and the armature have full contact. The rated holding force drops drastically if their pieces are not allowed to contact each other, even just through covering the surface with tape or paper, dropping the bond from thousands of pounds to just a few hundred, allowing for doors to be easily kicked open. The image below shows a strap of tape used to interfere with a maglock's bond so the door can be opened even if it should be locked:

Shut Doors Do Not Mean Secure

**** ******* **** *************** **** *** **** they ***. ****** ****** systems *** ***** **** status **********, *** ***** and ***** **** ******* may *** ** **** insecure. *** *** **** whether *** **** ***** is ******?  ***?

**** ****** ********** ********* a *** ************* ** many ****** ******* *******, but *** ***** ** commonly ******* ** *************. ****** this ****, ** *******:

  • *** **** ****** ********** Prevents ******** *****
  • *** **** ***** ** *** Mean ****** *****
  • ********* ** **** ******** vs.or **** **********
  • ******* ******** ****
  • ********* ********* ********** ** Latchbolt ****** **********
  • ********** ******* **** *******

The ********** ** **** **********

****** ***, **** ********** checks ** *** ******* an *******'* **** ** reporting ****** ** '******'.  Because **** *********** ***** can **** **** ******** when *** **** ** shut, **** ********** ***** access ******* *** **** is **** ****** *** secured.

**** **** ************* ********** access *****, **** ******** is ********** ** *********. Unless *** **** ******** itself ** ********* ** being ******, ********* *** defeat ***** ******** *** be ********** ** *** system. 

*** *******,******** ********** ** *********** ** placing ******* ******* ** the ****** ** *** latchbolt ***** ***** *******, or **** ** **** tape ** **** ***** extend ** ***. *** image ***** ***** *** common ***** *** ** used ** ******* *** latch **** ********* **** the ****** ** **** a **** ******:

*** ********************* ***** ******* ** holding *****, ** ***** only **** *** ****** and *** ******** **** full *******. *** ***** holding ***** ***** *********** if ***** ****** *** *** allowed ** ******* **** other, **** **** ******* covering *** ******* **** tape ** *****, ******** the **** **** ********* of ****** ** **** a *** *******, ******** for ***** ** ** easily ****** ****. *** image ***** ***** * strap ** **** **** to ********* **** * maglock's **** ** *** door *** ** ****** even ** ** ****** be ******:

Shut ***** ** *** **** ******

[***************]

*** ***** **** ** that ***** ***** *** otherwise ****** ***** ****** to ** ****** ******, but ** ************* ******** and ******** ** ****** locked ** *******.  **** a **** ******** **** **** ******** ******** *** **** **** ****** operators ** * **** is **** ** ****, leaving *** ********** **** 'closed' **** ***** '******'.

*************, **** ******** ** defeat ****** ******** **** from ********, ***** *** convenience *** *** ******, as ***** ** *** ******* ***** ****** ******* Tutorial. *******, **** ** done ******* ******** **********, tampering **** *** ****** lock *** ***** ****, ************ entry ******* *** **** to ********* ** ********* alike.

Door ******** ** **** **********

** **** *****, ***** lock ********** ***** ********** more **** **** ******** switches.  *** **** ****** **** ***********, ****** **** ******** Switches ** **** ******** are ********* ** *** 'Door *******' *****, ******* a ****** ******-****** ******* on *** ********** *****.  Here ** ** ******* for ** *** ***** controller:

*** **** ** ****** a *******-***** **** ******* can **** ** ****** as $* *** ***, and **** * *** minutes ** ******* **** be ********* ** ** access ******. *******, ********** integrated **** ********** ** the **** ****** *** add *% - **%, often $** ** $** to *** ****'* ****. The **** ********** *** explain *** **** ********** is *** ** ******** used ** **** ******** Switches.

** *** ****** *****, the ********** ***** ******* is ********* ** *********** by *** ** *** yellow *** ***** *****:

*** ****** ******* *** these ********** ** *** types ** ***** (**: strikes, ********, ** ******** latches) ** ***** ******* separate **** ***** *****, and ******* ***** ********** unconnected ********* ***** ****** the **** ******** ***********.

Three ****** *****

**** ********** ** ******* deployed ** ***** ****:

  • ********* ********** (***)
  • ********* ****** ********** (****)
  • ******* **** *******

***** *** ***** *** seem ** ** ******* almost *** ****, *** monitoring ******* *** *********** different.  *** **** * lock **** ** ****** parts, **** * *******, can ** ********* ** checking *** **** ********. We ******* *** ***** methods *****:

Latchbolt **********

*** *** ** ***** if ***** *** ****** and ***** ******* ******* is ** '********* **********'. In **** ******, * mechanical ** ********* ****** built ****** *** ****** checks ******* ** *** the ****'* ********* ** deadbolt ** ********.  ** the ***** ** ******, the *** ******* **.  If *** ***** ** not ******, *** **** is ********, *** *** switch ******* ********* ** uncontacted ** *** *****.

****'* ** ***** ******* the ******** ** *** monitoring ****** ****** * lock: 

***** ****** ****** ************* this ******* **** *% - 10% *** ****, ***** $20 ** $**, *** adding ** ******* ******** replacing ******** *****.

Latchbolt ****** **********

******* ****** ** ********** strikes ******** ******** *** internal ******** ********, ** that ** **** ********* whether ** ** *** strike ****** ** ***** or ******** ** ********* lock *******. *** ********* of **** ** **** they *** **** *******, and **** ***** ** malfunction *** ********, *** they *** *** ** common ** *** ******* on *******.

**** ******* ***** **** as ** ******, **** ******* **** ****** ******:

Bond *******

*** **** ****** ****** of ********** ******** ******** a ****** **** ****** the ***** ******** ** the *************** **** ****** the ****. **** *** field ** ********* ** within ****, ** ********** LED ** **** ****** loop ******* *** **** is ****** ******. *** image ***** ***** *** 'green ** ****' *** indicator ** *** *******:

** **** *****, **** sensors *** * ******* option, *** ***** **** adds ** **** ***** they *** ******* ********.  However, ***** ******* *** go '***' **** ****, and *** ********* ******** fail **** ******* ***. Periodic *********** ********* * technician ****** *** * replacement ****** ******* * few ******* *** ** needed **** ** ***** in *** **** ** five ***** *** ***** maglocks.

Using **** *** *** **** ********** ********

*** ******* ********, **** installers *** **** **** position *** **** ********** at *** **** **** by ****** *** ******** in ****** **** *** door ******** ******. ******* of ****** ******* * door ** **** ** closed, *** ****** ***** see ** ** **** and *** ****** ** closed *** ******.

**********, **** ********** ******* may ** *** ** separate ******* ********** ******. If ***** **** ** display **** ****** **********, this ****** *** **** be ****** ** *** accurate ******. *** *******, if ***** ******** ****** the *** ****** ** kept ******, ******** ********** from **** *** *** lock ********** ** ********.

[****: **** ******** *** originally ********* ** **** and ************* ******* ** 2017]

Comments (6)

** *** *** ******** **** ******, ******’* * ******** ***** of *****, *** ********* ** ******** *** *** ******, **** the ******?

***** * *** ***** **** *** **** *** ***** *******?

***, *** ***** ** **** ********* ** '****' **** **** for ****. ****** *** ***** ***** ***** **** **** * *CRASH* *** **** **** *** ******* ********, ** *** ***** itself ***** ******** ********** *** ***** *** **** '******' *** an ******* *******.

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

** ****** **** *********** *** *** *** ******* **** **** monitoring. ****** ** *** *** *********** ******* **** *** ******* security ***********'* *** ** *** *** ***** **** ******* *** the ******* ** **** ****** *** **** *** ***** **** the ***** **** ******* *** ***** ****** ******* ** ****** for *** **** *******. ***** ***** ****.

***** *** ***** **** ******* ****** *** * *** -- wouldn't **** ****** * *** ***** ***** **** *** **** opens, **** **** *** ******* **** ******* ******** * ****? So, ** **** ****** *** ** *** ********, ***'* *** on * ***** **** ************:

*. ***** ***** - ***** **** (****** **** ***** *** door **** * **** ** **** ********* ** *** ***** of *** ****)

*. *** ***** (**** ***** **** *******)

*. **** **** ***** (**** ******** ***** **** ******* *** latch ****** *******)

*. **** ****** ***** (** **** ****** *** ******** *** latch **** ******* ** ******** *** ****** ******* **** *** already ****** ****** *******)

** **** **** *** *** **** *** *** *** **** option **** ***? ******* ****** #* *** #* ***** **** in *** ******* ***** **** ***** ** * *** *** being **** ** ** ******** ******-********** **** *** ******* ** orderly ******** ** **** ****** ******** ** *** ****, *.*. 1) ******* ****, *) **** ****, *) ******* *** ****** while ******* ******* *** *******, *) **** ******.

** *** ******* *** ****** ** ***** *** *** *** not ****** *** ****** **********.

**** ***** *** **** **** *** ****** **** ********* ** shunt ** ************ **** *****?

**, ** *** ******** ** ** ***** **** *** *** and **** ******* * ******* ** **** ******* ** *** registered ***** **** *** **** * ****. ** **** *******/*** a ******* ** **** **** *** **** ** ****** **** the ****** **** (** **** ********* *** ****** ** *** unlock *** ****** *************) *** **** *** **** * **** at *** ****** *** *** ******* ****** ** **** *** register/log * ******* ** **** **** *** **** ** ******** opened. * ***** **** *** ******** *** ********* ******** **** a ****** ***** ** ******** ** *** **********. ****** **** triggers ** ********, * ******* ** ** ************* ******** **** a **** ***** ** ****** **** *** ******* ******* ******** the ***** ****** ******* ***** ***** *** ******* * ****** entry. ** ********** ***** ** **** ** ******* ****** ***** we *** * ******** **** *******.

****, *** ******* ** **** ********* ** ************ ** *** lock **********. * **** ***** **** ******** *** **** ***** regarding **** **********. *********, * *** ***** ********** **** ****** also ***** ****** ***** *** **** * *** *** *** but, ***** *** ***** ******* * *** **** *** **********.

**** ** ** *** ******!

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