OCB-L3704-T – Four-Door Access Controller

The OCB-L3704-T Four-Door Access Controller is a high-capacity, enterprise-grade access control solution designed for professional multi-door security applications. Supporting four independent doors, this controller delivers advanced access logic, robust alarm management, and secure network communication for complex facilities.

With storage capacity for 100,000 cards and 300,000 access events, the OCB-L3704-T is ideal for large-scale installations. It supports TCP/IP, EHome 5.0, ISAPI, RS-485, OSDP, and Wiegand protocols, ensuring seamless integration with third-party readers and management platforms. Built around a 32-bit high-speed processor, it guarantees fast processing, stable operation, and encrypted data transmission.

Advanced security features such as anti-passback, multi-door interlock, multi-authentication, and comprehensive alarm handling make this controller a reliable core component for commercial, industrial, and institutional access control systems. Offline data retention, power protection, and tamper-proof design further enhance system reliability.

Key Features

• Four-Door Access Control – Manages up to 4 independent doors simultaneously
• High-Capacity Storage – Supports up to 100,000 cards and 300,000 access events
• Powerful 32-bit Processor – Ensures fast response and stable system performance
• Secure Communication Protocols – TCP/IP, EHome 5.0, ISAPI with encrypted data transmission
• Multi-Protocol Reader Support – RS-485, OSDP, and Wiegand (W26/W34) compatibility
• Flexible User Management – Supports normal users, visitors, and blocklist users
• Advanced Access Logic – Anti-passback, multi-door interlock, multi-authentication, first-card open, super card, and super password functions
• Comprehensive Alarm Management – Reader tamper, door not secured, forced entry, door timeout, duress card/code, illegal card attempts, blocklist alarm
• Electrical Fault Protection – Short-circuit and open-circuit detection with alarms
• Cross-Controller Anti-Passback – Supports both RS-485–based and network-based anti-passback
• Multiple Card Types Supported – Normal, patrol, duress, and super cards
• Offline Operation Protection – Event storage during network loss with insufficient storage alarms
• System Reliability – Built-in clock, watchdog design, backup battery support, and permanent data retention after power loss
• Status Indicators – LEDs for power, communication, and operational status
• Time Synchronization – Automatic and manual time synchronization supported
• Industrial-Grade Protection – Isolated internal current and protective control board cover