Dahua DHI-ASC2104B-T – 4-Door Slave Access Control Module for CAN Bus Security Systems (EoL-L)

The Dahua DHI-ASC2104B-T is a four-door slave access control module designed to extend enterprise access control systems built around the Dahua ASC2204-H master controller. Widely deployed in office buildings, industrial facilities, and campuses where centralized multi-door access management with card, fingerprint, and password authentication is a baseline physical security project requirement.

The module stores up to 20,000 valid cards and 30,000 event records, covering medium and large installation requirements without a dedicated local storage server. It supports multiple authentication methods — card, password, fingerprint, and combinations — and manages 6 user types: General, VIP, Guest, Patrol, Blocklist, and Duress. Advanced access control functions include anti-passback, multi-door interlock, and multi-person unlock, configurable through 128 schedule groups, 128 time periods, and 128 holiday periods. The watchdog function ensures continuous operation without system halting.

The ASC2104B-T connects exclusively to the ASC2204-H master controller via CAN bus interface and supports readers through Wiegand or RS-485. Nine inputs — 4 door sensors, 4 exit buttons, and 1 alarm — and 5 relay outputs — 4 door locks and 1 alarm — cover standard configurations for 4 access points. Integrated alarms for door timeout, intrusion, duress, and tamper events provide complete security event monitoring. The operating temperature range of -30°C to +60°C supports installation in technical environments with significant thermal variation.

Recommended for physical security system integrators deploying access control in office buildings, manufacturing facilities, warehouses, and campuses where expanding a centralized Dahua system with slave modules for additional doors is the primary design requirement. The DHI-ASC2104B-T is the correct expansion component for medium and large-scale Dahua ASC installations.