2-1
Chapter 2
The access control system
Introduction
The access control system is designed to be flexible in the way it is
configured for different applications and powerful in its function. Its
modular structure provides a cost-effective adaptable system.
The 4101-2 Controllers are at the heart of the system. They can be
used either with Cotag Access Control Software or with other
supervising software as part of an OEM system. They provide the
wide range of extra functions required by the users of modern access
control systems.
4101-2 Controller features include:
• the same controller for all tasks.
• up to eight access points per controller.
• a family of application modules to fit different application
requirements.
• distributed intelligence to provide system speed and integrity.
• fast and powerful communications structure.
• programmable logical control of input/output events.
• simple installation.
• automatic system configuration during commissioning.
Access control
An access control system uses an access token - usually a card - to
identify its holder and either grant or deny access to a door (or
“access point”). To achieve this, the number or code contained in the
card is read by a reader or reading head under control of an
electronic circuit known as a controller. The controller takes the
access decision (whether or not to let the cardholder through the
door) and operates the door using an electrical door lock mechanism
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