Lock Status Monitoring Tutorial

By: Brian Rhodes, Published on Oct 28, 2019

Just because access doors are closed does not mean they are locked.

Unless access systems are using lock status monitoring, the doors and areas they protect could be left insecure. How can you tell when doors are locked?

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 Lock Monitoring Cost
  • Examining Latchbolt Monitoring vs Latchbolt Strike Monitoring
  • Explaining Maglock Bond Sensors

The Importance Of Lock Monitoring

'Lock monitoring' checks to see whether an opening's hardware lock is reporting itself as locked.

Because most electrified locks can only secure openings properly when the door is shut, Lock Monitoring essentially notifies access systems that doors are both closed and secured.

Monitoring Against Lock Tampering

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 to the right shows how 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 magnetic 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 velcro used to interfere with a maglock's bond so the door can be opened even if the maglock is configured to be locked:

Shut Doors Do Not Mean Secure

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

*************, **** ******** ** defeat ****** ******** **** from ********, ***** *** convenience *** *** ******, as ***** ** ********** ***** ****** ******* Tutorial. *******, **** ** done ******* ******** **********, tampering **** *** ****** lock *** ***** ****, uncontrolled ***** ******* *** door ** ********* ** outsiders *****.

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

** **** *****, ***** lock ********** ***** ********** more **** **** ******** switches. *** **** ********** ***********, ****** **** ******** Switches ** **** ******** are ********* ** *** 'Door *******' *****, ******* a ****** ******-****** ******* on *** ********** *****.

**** ** ** ******* wiring ******* *** ** HID **********:

*** **** ** ****** a *******-***** **** ******* can **** ** ****** as $* *** ***, and **** * *** minutes ** *******, ********* to ** ****** ******. However, ********** ********** **** monitoring ** *** **** itself *** *** *% - **%, ***** $** or $** ** *** item's ****. *** **** difference *** ******* *** lock ********** ** *** as ******** **** ** Door ******** ********.

** *** ****** *****, 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 ******* **** *% - **% *** ****, often $** ** $**, and ****** ** ******* requires ********* ******** *****.

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

******* ****** ** ********** strikes ******** ******** *** internal ******** ********, ** that ********* ******* ** no *** ****** ****** is ******* *** ********* lock *******. *** ********* of **** ** **** they *** **** ******* and **** ***** ** malfunction *** ********, *** they *** *** ** common ** *** ******* on *******.

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

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

Comments (1)

* ***** **** ** have **** ****** ********** at *** **********. *** too **** ** ****** door ******** ******** *** it ** **** ** a ***** *****. ******* adequate ******** ** ****** coverage ** ********* *** is ********* *** ****** it *** ** * nightmare ** ***** ****. So *** ***** **** for ****** ********** ** the ***** *** ***** well ***** ** ** the **** ***.

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