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20 October 2018

Access Control

An IP Access Controller is an electronic security device designed to identify users as well as control entry to or exit from protected areas. A typical IP access controller supports two or four basic access control readers. It may have an internal web server and support configuration via a browser or via software installed on a host PC.

The main features that distinguish IP controllers from older generation serial controllers are (i) that IP controllers connect directly to LAN/WAN and have all the inputs and outputs necessary for controlling readers, monitoring door inputs and controlling locks; and (ii) that IP controllers have an on-board network interface and do no require the use of a terminal server.

Advantages of IP Access Controllers

  • An existing network infrastructure is fully utilized; there is no need to install new communication lines.
  • There are no limitations regarding the number of IP controllers in a system (the limit of 32 controllers per line is typical for systems using an RS-485 communication interface).
  • Special knowledge of installation, termination, grounding and troubleshooting of RS-485 communication lines is not required.
  • Communication with IP controllers may be done at the full network speed, which is important when transferring a lot of data (databases with thousands of users, possibly including biometric records).
  • In case of an alarm, IP controllers may initiate connection to the host PC. This ability is important in large systems as it allows reduced network traffic generated by frequent polling.
  • Simplifies installation of systems consisting of multiple locations separated by large distances; a basic Internet link is sufficient to establish connections to remote locations.
  • A wide selection of standard network equipment is available to provide connectivity in different situations (fibre, wireless, VPN, dual path, PoE).
  • No special hardware is required for building fail-over systems; in case the primary host PC fails, the secondary host PC may start polling IP controllers.
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