Security door controller DAHUA ASC2202B-D — 2-door bare controller, 12 V, 1.4 A, RS-485, 210×50×106 mm

DAHUA ASC2202B-D is a 2-door bare security door controller with RS-485 interface designed for access control installations. It operates from a 12 V power supply with a typical current of 1.4 A and typical power consumption of 41.6 W. The compact bare-case design (210 × 50 × 106 mm) is suitable for cabinet or panel mounting and enables integration with other access control equipment via TCP/IP and RS-485.

Advantages

The controller supports dual communication protocols (RS-485 and Wiegand W26/W34), PoE power input and watchdog protection, and includes a built-in RTC with manual and automatic time synchronization. It stores up to 100,000 users and 500,000 card swipe records and provides multiple alarm inputs and anti-tamper features for reliable access control operation across two doors.

Suitable for

• Small-to-medium access control installations with up to two controlled doors
• Cabinet or panel mounting in security or network closets
• Systems requiring high user and event storage capacity
• Environments needing RS-485 or Wiegand reader integration

Key specifications

• Supported communications: TCP/IP, RS-485, Wiegand (W26, W34)
• User capacity: 100,000 users
• Event storage: 500,000 card swipe records
• Controlled doors: up to 2
• Power supply: 12 V, typical current 1.4 A, typical power consumption 41.6 W; PoE supported
• Operating temperature range: -30 to 60 °C
• Form factor: bare case for cabinet/panel installation; dimensions 210 × 50 × 106 mm
• Supported features: interlock, group combination, anti-passback, remote unlock, exit button
• Alarm support: reader tamper, intrusion, door sensor timeout, duress, illegal card threshold, incorrect password
• Timekeeping and maintenance: built-in RTC, manual and auto time synchronization, power-off memory protection, online upgrade support

How to use

Mount the bare controller in a suitable cabinet or panel and connect power (12 V or PoE if available), network (TCP/IP) and RS-485 or Wiegand reader interfaces as required. Configure door, user and alarm settings through the supported access control management software, synchronize time using the RTC or network time, and verify inputs such as exit button and door sensors. Ensure wiring follows the manufacturer's guidelines for lock outputs, sensor inputs and alarm circuits.

Recommendations

Use the controller in a temperature-controlled enclosure to maintain the specified operating range, keep firmware updated via online upgrade to ensure security and stability, and implement proper grounding and surge protection when installing network and power connections.