Doors.NET™ Software and NXT Family of TCP/IP-based Access Control Components

Today's business has become increasingly IT-centric and Keri Systems is ready to provide you with vital access control tools to safeguard your facility.
NXT Hardware Platform Mercury Powered

Also available with a Mercury Powered option that offers more more features.

  • Sophisticated embedded Ethernet-based access controllers (no LAN adapters) that hang right on the network
  • Managed by Doors.NET - SQL-based, Client/server Software, providing multiple concurrent sites, with no third-party client license fees
  • NXT-4-wire readers are fully supervised with encrypted data between cards/readers
  • Network Appliance architecture utilizing 2 or 4 door panels, coupled with optional interface boards for I/O and industry-standard reader formats
  • 50,000 card holders per controller, thousands of doors per system
  • Secure Client/server architecture
  • Utilizes existing networks or dedicated CAT-5 cabling
  • Totally "Flash" programmable and re-programmable
  • Optional I/O expansion with powerful, logical functions in Doors.NET Software
  • Supports 1 button auto-configuration process with embedded MAC address
  • Standard 4-pin block and RJ connection to Ethernet
NXT System Architecture Diagram

Product Description


Card holder

System Architecture and Software – Doors.NET™
  • Thin Client/ Server Architecture
  • .NET and SQL based
  • Setup system with auto configuration or manual entry
  • Define parameters for Doors, Inputs and Outputs that you can then replicate and reuse
  • Powerful user definable logical I/O linking

Read more about Doors.NET™...




  • 2 or 4 door versions
  • Ethernet based for peer to peer communication and to host
  • Multiple 485 networks for comm. to expansion boards and readers
  • Embedded MAC address for easy discovery and true 1 button auto configuration
  • Flash updatable

Read more about NXT-2D...
Read more about NXT-4D...

NXT-4x4 4 Input/Output I/O Expansion
  • 4 supervised inputs/4 outputs
  • Flash updatable
  • Networked via RS-485 to Controller

Read more about NXT-4x4...



  • Connected to Controller via RS-485 with a heartbeat so readers are supervised
  • Encrypted data from Cards to Readers to Controllers
  • 64 bit encrypted format
  • 1,000 Ft cable distance to controllers

Read more about NXT Readers...

  Reader Interface Board
  • Flexible mounting options: plugs into either the main controller or the I/O Expansion board
  • Converts either, Keri MS format, Wiegand or Mag Stripe to NXT encrypted format
  • Mix and match reader types on any given controller

Product Models

Software, Controllers and Accessories



Proximity Readers and Reader Accessories
NXT-K Proximity Cards and Tags

NXT Hardware + Doors.NET™ Software by Keri Systems begins with sophisticated .NET framework and SQL software, operating in a true client/server environment. Doors.NET allows multiple concurrent users, login across multiple concurrent sites, all accomplished without the imposition of third-party royalty fees. You can count on Doors.NET™ for ease of use and administration, as the user interface has been designed around an extremely intuitive front-end.
NXT System ArchitectureWhether your application calls for dozens of operators or thousands of doors, Keri's Doors.NET™ software combined with NXT hardware is the answer. Either of our two-door or four-door panels will handle 50K cardholders in resident memory. They can communicate seamlessly over your network or you may decide to create a new network utilizing simple CAT-5 cable. NXT-4D and NXT-2D panels are equipped with 4-pin block and RJ terminals for ease of connection. Once connected, an intuitive, one-button, auto-configuration process with embedded MAC address makes your setup a cinch.

Please note, Doors.NET™ is not compatible with the Doors/PXL family of products.


Document Name File Size Download Time
Architectural Specification 86 Kb 00 min 10 sec


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