Security door controller Dahua DHI-ASC2202B-S — 2-door bare controller, 12 V, 24 W, RJ-45/RS-485

Dahua DHI-ASC2202B-S is a bare 2-door access controller designed for integration into access control systems. The unit supports Ethernet (10/100 Mbps) and RS-485 communication, accepts PoE power supply, and runs from a 12 V supply with typical power consumption of 24 W. It stores up to 100,000 users and 500,000 card swipe records and includes real-time clock with manual or automatic synchronization. The compact bare case makes it suitable for installation inside control cabinets or enclosures in office and small building environments.

Advantages

The controller supports multiple communication protocols (TCP/IP, RS-485, Wiegand W26/W34) for flexible system integration and offers large on-board capacity for users and event logs. Built-in features such as interlock, anti-passback, remote unlock, various alarm types, power-off memory protection, watchdog and online upgrade support improve reliability and operational continuity. PoE support and standard RJ-45 interface simplify cabling and deployment.

Suitable for

• Small to medium office access control (two doors)
• Reception or server room entry management
• Integration into centralized security systems over Ethernet or RS-485
• Enclosed installations inside control cabinets or electrical rooms

Key specifications

• Supported doors: 2
• Communication interfaces: Ethernet (10/100 Mbps, RJ-45), RS-485, Wiegand (W26/W34)
• User capacity: 100,000 users
• Event log capacity: 500,000 card swipe records
• Power input: 12 V DC, typical power consumption 24 W; PoE supported
• Supported features: interlock, group combination, anti-passback, remote unlock
• Alarm types: card reader tamper, intrusion, door sensor timeout, duress, illegal card threshold, incorrect password
• Built-in real-time clock with manual and auto synchronization
• Memory protection on power loss; online firmware upgrade; watchdog support
• Operating temperature range: -30 to 60 °C
• Dimensions (L×W×H): 155 × 106 × 50 mm

How to use

Install the bare controller inside an appropriate enclosure and connect to the building network via RJ-45 or to a field bus via RS-485. Provide 12 V DC power or use PoE where available. Connect door locks, exit buttons, door sensors and card readers using the supported Wiegand or RS-485 interfaces according to wiring diagrams. Configure user accounts, access rules, interlock and anti-passback settings through the management software or central controller. Ensure the device clock is synchronized either manually or via automatic time synchronization.

Recommendations

For reliable operation, mount the controller in a ventilated, secure enclosure away from direct moisture and extreme heat; use stable 12 V power supply or PoE with adequate surge protection, and perform regular firmware updates and backups of user and event data.