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RS485 LAN System

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RS485 LAN System

Overview

The Integriti/Infiniti RS485 LAN is a 3 or 4-wire network used to connect modules to the controller. It supports polling and supervision for high security.

Technical Details

  • Cabling: Use Twisted Pair cable.
    • Recommended: Shielded Twin Twisted-pair (e.g., Belden 8723, Alpha 2466C, Garland MCP-2IS).
    • Alternative: Unshielded Cat5e/6 UTP (if regulations permit).
  • Wiring: One pair for “A” & “B”, another for “POS” & “NEG”.
  • Max Length: 1500m from Controller to the furthest module; 2000m total cabling without Isolators.
  • Max Modules: 64 modules without LAN Isolators.
  • Termination: The LAN is self-terminating.
    • Integriti/Inception: Do NOT use termination resistors on modern modules.
    • Elite Terminals: In an Inception LAN, Elite LCD Terminals MUST NOT be terminated; the “Term” link must be removed.
  • Module Compatibility (Inception):
    • Supports SLAM (up to 32 per controller).
    • Supports ILAM (up to 8 per controller).
    • Supports 8-Zone LAN Expander (up to 32 per controller).
    • Supports Elite/EliteX LCD Terminals.

Configuration / Programming

  • Management Distinction: Unlike Integriti which uses ISC-based management and Professional software, Inception uses a browser-based interface hosted directly on the controller.
  • LAN Isolation: Use LAN Isolator for distances >1500m, >64 modules, or to prevent Earth Loops in complex sites.
  • Powering Modules: Modules can be powered from the LAN or locally. NEVER connect the POS of two different power supplies together on the LAN.
  • LAN Power Limitation: LAN Power must not be used if one or more UniBus Expansion boards are connected to the module.
  • Module Identification:
    • SLAM: Identified as “2-Door Reader Module (R)” in Integriti; “Standard LAN Access Module (SLAM)” in Inception.
    • ILAM: Identified as “8-Door Reader Module (I)” in Integriti.
  • Addressing: Modules are addressed using a 7-way DIPswitch (1-99). The address is n + 1 where n is the binary value.

Troubleshooting

  • Voltage Checks (Inception specific):
    • LAN +ve to GND: 11V to 14V DC (If < 11V, indicates too many devices or flat battery).
    • LAN B to LAN A: 500mV to 4.5V DC.
    • LAN A to GND: 500mV to 4.5V DC (If < 500mV or > 4.5V, suspect Earth Loop).
  • Intermittent Comms: Check Review Logs for “Module Disconnected” and “Module Connected” messages.

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