Wednesday, 10 October 2018

How to install advance fingerprint control with old latch system

Information technology has spread its wings across many facets of life, be it personal, social or professional. Businesses and institutional outfits have become heavily dependent on the smooth functioning of information systems and the network formed by connecting them with each other.

One of our valued customers called us for replacement of the fingerprint access control. The last fingerprint Access control was installed by us about 2 years ago. It has been working well until a power surge blew up the system.  The old biometric lock was controlled by connecting only 05 cables: 
  • 2 Red for DC 12v,
  • 2 Black for GND, and
  • 1 door lock COM connected with latch

Below is a picture of the old device:

The new Biometric Fingerprint Access standalone we were given to install was a Dahua DHI-ASI1212D as seen in the picture below.

This Fingerprint Access has 24 cables and Rj45 Network port. This device should be able to export the signal to the latch after the fingerprint is read to unlock the door. Door sensor will detect on/off state.
If the door is opened by force or improperly closed, the alarm signal will be triggered.  

The new Dahua device should normally be used with the below magnet strike:

The client did not provide this item and we were left with the challenge to install the device using the dead locking tubular latch that was used with the older device as shown in the picture below:

Let me explain how it is possible to install and connect an advance Fingerprint Access Standalone using only 05 cables out of 24 and operate and make it work with the dead locking tubular latch.
There are 24 cables coming out of the new Dahua device as follows:
  • 3 Red
  • 3 Black
  • 3 Green
  • 3 Blue
  • 3 Brown
  • 3 Yellow
  • 3 Purple
  • 3 White 
And there are 5 cables from the old latch and push button switches as follows:
  • 2 Red
  • 2 Black
  • 1 Black and Red
The connections are done in the following 3 simple steps:
  1. The 3 Red cables and the COM1 Green cable from the new Dahua are combined together and connected to the 2 Red cables from the latch,
  2. The 3 Black cables are combined together and are connected to the 2 Black cables from the latch,
  3. The Blue COM 1 cable is connected to the Red and Black cable from the latch.
  4. The lock was tested by the customer and it was working well as expected.
One more happy NATC customer.

Prepared By: Farman Elahi