RBH Access Control Systems Range - Axiom Controllers, Biometric Readers and Electromagnetic Locks for Commercial Security Installations NZ

How Does Door Access Control Work? A Technical Guide for NZ Installers & Procurement Teams

Essential Security Supplies

The Role of Door Access Control in Modern Security Systems

Door access control is the foundation of any professional security installation. Rather than relying on traditional lock-and-key mechanisms, electronic access control systems manage who can enter a space, when, and under what conditions - generating a full audit trail in the process. From single-door standalone locks to enterprise-grade multi-door networked controllers, understanding how these systems work is critical for specifying, installing, and maintaining them correctly.

UNC-500-FT-8R-RM RBH Axiom Access Control Module - Enterprise-grade modular door access control at Essential Security Supplies NZ

Core Components of a Door Access Control System

Every access control system - regardless of scale - is built from the same set of functional components. These work together to authenticate users, make access decisions, and control physical locking hardware.

1. Credential

A credential is what the user presents to gain access. Common credential types include:

  • MIFARE or DESFire smart cards (contactless RFID)
  • PIN codes entered on a keypad
  • Biometric data - fingerprint, iris, or facial recognition
  • Mobile credentials via NFC or BLE (Bluetooth Low Energy)
  • Combinations of the above (multi-factor authentication)

The credential type chosen directly affects the security level and user experience of the system. Higher-security environments typically require two or more factors.

2. Reader / Credential Terminal

The reader captures the credential and transmits data to the access controller for verification. Readers are typically mounted at the door and communicate with the controller via Wiegand, RS-485, or OSDP protocols.

RBH-BFR350 Blueline Fingerprint Reader with PIN Keypad and Card Reader - Multi-factor biometric access control at Essential Security Supplies NZ

RBH readers are engineered for concurrent multi-format credential support. The RBH-FK-640-STO reads a sector of MIFARE cards and includes an integrated keypad for PIN entry, while the RBH-NK86-DNB-D34 supports UHSC DESFire, NFC, and BLE in a single Wiegand keypad reader - ideal for high-security and mobile credential environments. For biometric requirements, the RBH-BFR350 Blueline combines fingerprint, PIN keypad, and card reader in one unit.

3. Access Controller (Panel)

The access controller is the intelligence of the system. It receives data from the reader, compares it against a stored access list, evaluates time schedules and rules, and then issues a command to lock or unlock the door hardware. Controllers are rated by the number of doors and readers they can manage.

RC2M RBH Axiom 2 Door Access Controller - Modular enterprise access control panel at Essential Security Supplies NZ

RBH's Axiom range sets the benchmark for modular enterprise access control. The RC2M RBH Axiom 2 Door Access Controller manages two access points via a secure D-Net link to the NC-100 network controller. It supports concurrent multi-format credentials including MIFARE, iClass, RFID, barcode, mag stripe, fingerprint, and iris - with up to 5 card formats per reader and 5-12 digit card numbers. Multiple supervised power supplies, programmable I/O, and an exceptionally rugged build make it one of the most reliable reader controllers available for professional installations.

For sites requiring expanded door coverage, the UNC-500-FT-8R-RM RBH Axiom module extends system capacity within the same Axiom architecture.

4. Locking Hardware

The locking device physically secures the door and is switched by the controller's relay output. The correct lock type depends on the door construction and failure mode requirements:

  • Electromagnetic locks (maglocks) - fail-safe (unlock on power loss); suited to fire egress routes
  • Electric strikes - can be fail-safe or fail-secure depending on specification
  • Mortised electromagnetic locks - concealed within the door frame for a clean aesthetic
KML-CCW30F EML 135Kg Mortised Electromagnetic Lock - Single, sliding and double action door locking at Essential Security Supplies NZ

The KML-CCW30F mortised electromagnetic lock is rated at 135 kg holding force, suitable for single, sliding, and double action doors. It features a built-in voltage spike suppressor, hall-effect lock sensor, and door sensor - providing locking feedback and door position status to the controller.

5. Exit Device (REX)

A Request to Exit (REX) device allows authorised egress from the secured side of the door without presenting a credential. REX inputs may be push buttons, passive infrared (PIR) motion detectors, or push bars. The controller monitors REX signals to shunt alarms and release the lock for egress. RBH controllers include dedicated REX input monitoring with configurable shunt timing per door.

How the Authentication Sequence Works

When a user presents a credential, the following sequence occurs in milliseconds:

  1. The reader captures the credential data (card UID, PIN, or biometric template).
  2. The credential is transmitted to the access controller via Wiegand, RS-485, or OSDP.
  3. The controller checks the credential against its stored access list and evaluates applicable time schedules, zone rules (anti-passback), and door interlock conditions.
  4. If access is granted, the controller energises or de-energises the door lock relay for a defined unlock duration.
  5. The door position sensor (DPS) confirms the door has opened and closed within the permitted time; if not, a door-held-open alarm is triggered.
  6. The event is logged to the controller's internal memory and, where networked, transmitted to the access management software in real time.

Standalone vs Networked Access Control

Access control systems fall into two broad architecture types, each suited to different site scales and management requirements.

Standalone Systems

Standalone controllers store all access data locally and operate independently of a network. They are cost-effective for single-door or small multi-door installations where centralised management is not required. Programming is typically done via keypad, RFID master card, or direct USB/serial connection.

The Schlage CO200 Series is a prime example - an integrated standalone lock combining credential reader, controller, and locking hardware in a single unit, suited to interior doors where a networked infrastructure is not viable.

Networked Systems

Networked systems connect controllers to a central access management platform via TCP/IP, enabling real-time credential updates, remote door control, centralised audit logs, and multi-site management from a single interface. These systems are standard for commercial, government, and enterprise installations in New Zealand.

The RBH Axiom platform is purpose-built for this architecture. The RC2M connects to the NC-100 network controller via a secure, redundant D-Net link, delivering enterprise-level reliability with programmable I/O and full multi-format credential support across every door on the system.

For a reference framework on physical security standards applicable to networked access control, the New Zealand Security Association (NZSA) provides industry guidelines relevant to security system design and installation practice in NZ.

Product Specifications

Specification RC2M - RBH Axiom 2 Door Access Controller
Doors Supported 2
Credential Formats MIFARE, iClass, RFID, Barcode, Mag Stripe, Fingerprint, Iris
Card Formats Per Reader Up to 5 concurrent
Card Number Length 5-12 digits
Controller Interface D-Net (secure, redundant link to NC-100)
Reader Interface Wiegand
Power Supplies Multiple supervised power supplies
I/O Programmable inputs and outputs
Build Rugged, high-reliability construction
Compatible System RBH Axiom (NC-100 network controller)

View our full access control range for model-specific specifications across the RBH Axiom controller range.

Choosing the Right Door Access Control System for Your Site

Specifying the correct system depends on several key variables:

  • Number of doors and readers - determines controller tier (2-door RC2M, expanded Axiom modules)
  • Credential technology - MIFARE Classic is common; DESFire EV2/EV3 is recommended for higher-security environments due to stronger encryption; RBH readers support both concurrently
  • Failure mode requirement - fail-safe (unlock on power loss) vs fail-secure (remain locked on power loss); fire code compliance must be considered
  • Integration requirements - does the system need to integrate with intrusion detection, CCTV, or a building management system?
  • Management model - standalone self-managed, or networked via the RBH Axiom NC-100 platform
  • Audit and compliance requirements - enterprise sites typically require tamper alarms, forced-door alerts, and exportable event logs

For guidance on specifying the right RBH Axiom solution for your project, view our full access control range or contact our team directly.