Access Control

Access Control

How Door Access Control Systems Work (Simple Breakdown for Businesses)

How Door Access Control Systems Work (Simple Breakdown for Businesses)

Controlling who enters your building is one of the most basic but important parts of business security. That’s why door access control systems are now the go-to solution for modern businesses, replacing old-fashioned locks and keys.

But how do they actually work?

In this guide, we’ll explain how door access systems function, what equipment is involved, and the options available – without the tech jargon.

What is a Door Access Control System?

A door access control system is an electronic system that lets you control and monitor who can unlock specific doors or entry points in a building.

Instead of using keys, people use things like:

  • Key fobs or cards

  • PIN codes

  • Mobile phone apps

  • Fingerprints or facial recognition

You set the rules for who can enter, where, and when – giving you total control over building access.

How the System Works – Step-by-Step

Let’s say someone walks up to your office door. Here’s what happens:

  1. They present their credential (fob, card, phone, PIN, etc.) to a reader.

  2. The reader sends the data to a control panel (also called the access controller).

  3. The controller checks the database:
     Is this person allowed to enter this door at this time?

  4. If yes, it sends a signal to unlock the door.
    If no, access is denied and it can trigger an alert or log the attempt.

The entire process takes less than a second.

Main Components of a Door Access System

1. Access Credentials

This is what people use to “unlock” the door:

  • Proximity key fobs/cards

  • Mobile phone with NFC/Bluetooth

  • PIN codes (less secure but useful)

  • Biometric data (fingerprint, facial recognition)

Some systems let you use multiple types together — like fob + PIN for extra security.

 

2. Access Readers

Mounted on or near doors, these devices scan the credentials. Types include:

  • RFID readers (for cards/fobs)

  • Keypads (for PINs)

  • Biometric readers (fingerprint, face)

  • Mobile phone readers

 

3. Electric Locks

When access is granted, these unlock the door:

  • Maglocks (magnetic locks) – Common for glass doors

  • Electric strikes – Often used with standard doors

  • Motorised locks – More advanced, often used in secure areas

 

4. Access Control Panel (Controller)

  • Verifies credentials

  • Stores user permissions

  • Logs all access attempts

  • Controls the electric lock

 

5. Access Management Software

Where admins manage users, permissions, and schedules. Features often include:

  • Add/remove users

  • Create access groups (e.g., staff, managers, visitors)

  • Set door open times

  • View access logs

  • Trigger lockdowns or alarms

Local vs Cloud-Based Systems

Local (On-Premise) Systems

  • Software is hosted on a server or PC onsite

  • Offers full control, but needs local management

  • Example: Paxton Net2

Cloud-Based-Systems

  • Managed via a web dashboard

  • No onsite server required

  • Ideal for businesses with multiple locations or remote management needs

Where Door Access Control is Used

Anywhere security and control is important:

  • Offices – Separate staff, admin, and client access

  • Warehouses – Restrict sensitive stock areas

  • Healthcare – Protect patient records or medical supplies

  • Schools – Lock down buildings quickly when needed

  • Shared offices or apartment blocks – Manage multiple users easily

Extra Features You Can Add

Modern access control systems often include:

  • Door status monitoring – Alerts if a door is forced or left open

  • Time-based access – Only allow access during business hours

  • Temporary access – For contractors or visitors

  • Integration with CCTV or alarms – Boost your overall security setup

Common Problems

  • Fob/card not working? → It may have been deactivated or expired

  • Door won’t unlock? → Power supply or lock fault

  • System crash? → Check controller power or software connectivity

Tip: Choose a reputable installer who provides ongoing support and maintenance.

Need a Professional Installer?

A properly installed system is key to avoiding future issues. Our team at SecureEntry has installed door access systems across a wide range of sectors, including:

Offices
Industrial units
Schools and nurseries
Retail premises

We’re certified Paxton Net2 installers and offer free site surveys and clear quotes with no pressure.

Enquire here if you would like more information about our access control system installation at your site.

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