Access control card readers are used for reading data embedded in cards to allows access through access control points, typically a locked door. An access control reader can be a magnetic stripe reader, a bar code reader, a proximity reader, a smart card reader, or a biometric reader. More popular now is the proximity cards and biometric.
There are various type of Proximity Cards technology. They are:
- EM Proximity Cards
- MiFare Proximity Cards
- HID Proximity Cards
- iClass Proximity Cards
This list is not exhaustive and did not include other type of card technologies that are less common. But if you have a need for a card technology not listed here, please feel free to contact us at 62864796.
Proximity Card Readers
A Proximity card reader radiates a 1" to 20" electrical field around itself. Cards use a simple LC circuit. When a card is presented to the reader, the reader's electrical field excites a coil in the card. The coil charges a capacitor and in turn powers an integrated circuit. The integrated circuit outputs the card number to the coil which transmits it to the reader.
A common proximity format is 26 bit Wiegand. This format uses a facility code, sometimes also called a site code. The facility code is a unique number common to all of the cards in a particular set. The idea is that an organization will have their own facility code and a set of numbered cards incrementing from 1. To prevent duplication of cards, manufactures have created formats beyond 26 bits.
Biometric Readers may utilise fingerprints, hand geometry, iris or facial feature of a user to identify the user. An initial scan is stored in a template and used to compare with subsequent scans to determine the identity of the user. This method is generally preferred by most end users because it eliminates the need to carry ID cards or use PINs.
On the other hand this method is slower, because the reader may have to perform thousands of comparison operations until it finds the match, particularly for large installation with many users. Currently most 1-to-many readers are capable of performing 2000-3000 matching operations in one second. In the 1-to-1 mode a user must first identify himself/herself to the reader by either presenting an ID card or entering a PIN. The reader then looks up the template of the user in the database and compares it with the live scan. The 1-to-1 method is considered more secure and is generally faster as the reader needs to perform only one comparison. Most 1-to-1 biometric readers are "dual-technology" readers: they either have a built-in proximity, smart card or a keypad reader.
Proximity Keypad Reader
Long Range Readers
While the reading range of most proximity readers is sufficient for most applications, there may be applications where you will need to have a longer read range. One common application is in car parks operations. Here, a long range reader with reading range of 2 - 10m can read a vehicle transponder, open the barrier gate without the driver having to stop and get out of the car. Other common application is in the warehouse where a long range reader picks up the tag of an employee as he approach the door, and automatically open the door without him needing to stop at the reader to flash the card.