using key card with wiegand access control system


Key takeaways

  • A Wiegand access control system uses magnetic fields to establish a connection between a credential and a reader.
  • While Wiegand readers are simple to use and integrate into other systems, getting a new Wiegand card is a major hassle.
  • If you invest in a Wiegand door controller, you might want to supplement it with other access control solutions, like keypads or smart intercoms.


When you’re in charge of controlling access at your property, you have to balance your property’s need for security with a quick and easy access experience for tenants and their guests. And these days, you can choose from a lot of systems that claim to offer the best of both worlds — including key card and fob solutions like Wiegand access control.

But will Wiegand access control benefit your property?In this post, we explain what Wiegand access control is and how it works. Then, we go over its pros and cons and list some alternative access solutions to consider.

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What is Wiegand access control?

Wiegand access control is a method of electronic access that uses magnetic fields to transmit data from a credential to a reader. More specifically, Wiegand access depends on a special type of wire called Wiegand wire, which has unique magnetic properties.

In addition to access control systems, you can find the magnetic properties of Wiegand’s wires in many other use cases, including tachometers, gas meters, and rechargeable batteries in medical devices.


A Wiegand access control system includes these parts:

  • Credentials. Wiegand credentials are usually key cards, fobs, or badges.
  • Reader. One of the most important components of a Wiegand card reader is a coil that generates a magnetic field. When a Wiegand card comes in contact with the reader, the coil makes the wires on the credential release a burst of energy that can be read.
  • Control panel. The control panel contains an electronic database of credential information. The reader sends info to the Wiegand access control panel. Then, it compares the data it receives against its database and directs the door or gate to open if there’s a match.
  • Door lock. A Wiegand door lock disengages when it receives an electrical signal from the control panel.


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How does a Wiegand access control system work?

A Wiegand access control system works by transmitting data from the wires on a Wiegand credential to the reader. This data transfer happens because of the Wiegand effect.

When a Wiegand card comes in contact with the reader, the coil makes the wires on the credential release a burst of energy that can be read.

Simply put, Wiegand devices are credentials and readers that operate on a unique wire communication system.


Is Wiegand an RFID?

While Wiegand is not an RFID itself, it is a protocol often used in RFID systems for access control. Further, Wiegand refers to the communication protocol used between card readers and the access control system’s main controller.

So, while a Wiegand protocol is not RFID itself, it is a crucial component of many RFID-based access control systems. Thus, enabling the communication between RFID cards and the access control system.


What is the Wiegand effect?

Essentially, the Wiegand effect is what happens when you put a Wiegand wire near a magnet. When they’re near a magnet, Wiegand wires emit bursts of energy that a reader can pick up. And because the credentials are so intricate, the Wiegand effect ensures that each card carries secure and unclonable data.


using a biometric wiegand access control system


What frequency is Wiegand?

There is no standard frequency specified for a 26-bit Wiegand format, as the frequency can be customized based on the system’s design and the manufacturer’s specifications. However, a common frequency for Wiegand readers is 125 kHz.

Moreover, Wiegand cards and fobs store data in a specific format called the “26-bit format.” Because Wiegand was one of the first electronic access control systems to hit the market, many of today’s manufacturers still use a 26-bit Wiegand format.


Is Wiegand secure?

Yes, Wiegand is secure. However, it’s secure because the credential data that Wiegand keys store is hard-coded into them when they’re created at a factory. So, ordering a new Wiegand card for a resident might be a logistical nightmare as there are some limitations to them, as you’ll see below.


Wiegand access pros and cons

Wiegand access control systems may help manage property access, but they aren’t perfect. Here, we outline the advantages and disadvantages of using a Wiegand door controller.


What are the advantages of Wiegand?

  • Easy to use. A Wiegand access control system can use cards or fobs as its credentials. Using a card is as easy as swiping — which beats fumbling around with an outdated brass key! Additionally, property managers can choose a wireless Wiegand reader to simplify installation.
  • Secure. A hacker might be able to access another type of card that’s powered wirelessly. For example, RFID tags are easy to clone. However, because Wiegand cards use magnets to store their data, they’re harder to copy.
  • Easy to integrate with other systems. Wiegand technology still informs the way many of today’s access control companies design their products! Even though other solutions are developed independently, many access control companies choose to encode data with Wiegand reader compatibility. This is because Wiegand was the standard in electronic access control for a long time.

Note: If you have an existing access control system, chances are you can add a Wiegand card or fob reader into your system without any problems.


What are the drawbacks of Wiegand access control?

  • Lack of bidirectional communication. More advanced methods of credential verification, like WiFi-based or Bluetooth-based systems, can change both the credential and the reader. But Wiegand systems don’t support this capability. For example, a newer NFC access control system can record every entry event for both a reader and a tenant’s credential.
  • Residents might lose cards or fobs. Residents losing a card is a big deal for a Wiegand system. Property managers who use keys and fobs to secure their property are undoubtedly familiar with one pitfall: constantly replacing credentials as residents move in, move out, or lose theirs.


3 alternatives to Wiegand access control

Wiegand door controllers come with many benefits. However, as access control has evolved over time, you have more options to secure your property and control access.

Three alternatives to Wiegand access control include:

  1. RFID
  2. Keypad
  3. Intercom with smartphone app



An RFID access system uses radio waves instead of magnetic waves to transmit data between a reader and a credential. With an RFID system, you can assign your residents keys or fobs.

While a resident might not think about the technology that powers their key or fob, the kind of credential a resident uses still affects how you manage your property.

Whether a key fob is powered by Wiegand or by RFID, your staff will still spend a lot of time managing credentials. Staff will have to create new credentials for incoming residents, replace credentials for residents who have lost theirs, and deactivate credentials when residents leave the property.

Moreover, key fobs can become demagnetized, which can render them ineffective.


2. Keypad

If you want to manage access to an interior space, like a gym or a rooftop, keypads are a great solution. But keypads might not be ideal to manage access at a building’s front entrance.

Keypads don’t come with a way for a tenant to speak to a guest and let them in, while an intercom does. So, it’s best to supplement keypads with another access solution to secure the front door or gate.


3. Intercom with smartphone app

Lastly, an intercom that your tenants can control with their smartphones is a modern, convenient access option.

You can combine a smartphone-based intercom with other hardware to form one cohesive system that simplifies access throughout your entire property. For example, consider installing a smart video intercom at your building’s front door or gate and keypads at interior entryways.


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Ferdison Cayetano

I’m a proptech enthusiast from New Jersey who’s looking forward to the innovations that will revolutionize real estate.

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