The Dahua ASC4204B-S is a highly advanced, stand-alone 4-door one-way network access controller designed for professional security management in corporate, industrial, and complex facility environments. Powered by an embedded processor running a stable Linux operating system with built-in web configuration, it offers seamless centralized management and remote monitoring without the need for a dedicated PC server.


Supporting multiple authentication methods including card, password, fingerprint, QR code, and remote verification, the ASC4204B-S provides ultimate flexibility and high-level security. It boasts an impressive storage capacity of 100,000 users, 100,000 cards, 10,000 fingerprints, and 500,000 event records. The controller features versatile connectivity with 5 RS-485 ports (4 for readers, 1 for extension) and 4 Wiegand inputs, alongside an RJ-45 10/100 Mbps Ethernet port.


Equipped with Standard PoE power support (or 12V DC backup), the ASC4204B-S simplifies installation with its compact PC+ABS casing designed for both surface and DIN rail mounting. Advanced security logic includes anti-passback, multi-door interlock, multi-factor authentication, and intelligent alarms (tamper, duress, intrusion, and door sensor timeout). Fully compatible with ONVIF Profile C and Dahua's SmartPSS/DSS platforms, this controller is the ultimate solution for scalable, high-security access control.


Category
    
Specification


Product Name
    
ASC4204B-S (DHI-ASC4204B-S)


Brand
    
Dahua


Product Type
    
4-Door 1-Way Stand-alone Access Controller


Main Processor
    
Embedded Processor


Operating System
    
Embedded Linux (with Web Configuration)


Casing Material
    
PC + ABS


Installation
    
Surface Mount; DIN Rail (Guide Rail) Mount


User Capacity
    
100,000 users


Card Capacity
    
100,000 cards


Fingerprint Capacity
    
10,000 fingerprints


Record Capacity
    
500,000 event records


Verification Methods
    
Card, Password, Fingerprint, Remote, QR Code


Advanced Functions
    
Multi-door Interlock, Anti-passback, Multi-factor Auth, First-User Unlock, Blocklist/Trusted List


Network Port
    
1 × RJ-45 (10/100 Mbps self-adaptive)


Wiegand Ports
    
4 × Wiegand inputs


RS-485 Ports
    
5 × RS-485 ports (4 for readers, 1 for extension; supports OSDP)


Alarm Input
    
1 channel (Expandable to 8 with external module)


Alarm Output
    
1 channel (Expandable to 8 with external module)


Lock Control
    
4 channels


Door Status Detection
    
4 channels


Exit Button
    
4 channels


Network Protocols
    
IPv4, IPv6, TCP, UDP, P2P, ONVIF Profile C


Power Supply
    
Standard PoE; 12 VDC 1A (when no peripherals are connected)


Power Consumption
    
≤ 3 W (Base operation)


Product Dimensions
    
210.0 mm × 106.0 mm × 34.1 mm (8.27" × 4.17" × 1.34") (L × W × H)


Packaging Dimensions
    
255 mm × 166 mm × 87 mm (Inner Carton)


Operating Temperature
    
–30 °C to +60 °C (–22 °F to +140 °F)


Operating Humidity
    
5% – 95% RH (non-condensing)


Operating Environment
    
Indoor


Gross Weight
    
0.54 kg (1.19 lb)