Device Type: 4-Door One-Way Networked Access Controller
Brand/Model: Dahua DHI-ASC2204B-S (ASC2204B-S)
Video Output: N/A (access controller — no video output port)
Data Ports: 1× RJ-45 10/100 Mbps Ethernet (TCP/IP); 5× RS-485 ports (4 for readers); 4× Wiegand ports (W26/W34); 1× Alarm Input (digital); 1× Alarm Output (relay); 4× Exit Button inputs; 4× Door Status Detection; 4× Lock Control outputs (fail-safe, stays open by default)
Capacity:Users: 100,000
Cards: 100,000
Passwords: 100,000
Fingerprints: 3,000
Records/Event Log: 500,000
Door Control & Security Features:
Doors: 4 (one-way access, one reader per door)
Reader Support: 4× RS-485 readers OR 4× Wiegand readers
Multi-Door Interlock: Yes
Anti-Passback: Yes
Group Combination: Card / password / fingerprint unlock combinations
Multi-Person Unlock: Yes
First-Card Unlock: Yes
Remote Verification / Remote Unlock: Yes
Blocklist / Allowlist: Yes
Period List: 128 periods + 128 holiday periods
Fire Alarm Linkage: Yes
Alarms: Tamper, intrusion, door sensor timeout, duress, duress fingerprint, illegal card exceeding threshold, incorrect password
Protocols & Software:
Network Protocols: IPv4, TCP, UDP
OSDP Protocol: Yes
SDK/API: Yes
Real-Time Surveillance: Yes
Online Upgrade: Yes
Power-Off Memory Protection: Yes
Watchdog: Yes
Built-in RTC: Yes (manual + auto time synchronization)
Power & Consumption:
Power Supply: Standard PoE (separate power supply required for door lock) OR DC 12V (can supply power to door lock)
Consumption (PoE): Standby 1.0W / Working 13.0W
Consumption (12V DC): Standby 0.8W / Working 41.6W
Physical & Environment:
Casing: PC + ABS
Protection Rating: IP20 / IK04
Dimensions (W×D×H): 210 × 106 × 50 mm
Net Weight: 0.6 kg (1.33 lb)
Installation: Surface mount or DIN rail (Model B slide rail)
Operating Temperature: −30°C to +60°C (−22°F to +140°F)
Operating Humidity: 5%–90% RH (non-condensing)
Operating Environment: Indoor
Certifications: CE / FCC / UL
Key Specs: Dahua DHI-ASC2204B-S 4-Door One-Way Networked Access Controller, TCP/IP + RS-485 + Wiegand (W26/W34) + OSDP, 100,000 Users / 100,000 Cards / 3,000 Fingerprints / 500,000 Records, 5× RS-485 (4 Reader) + 4× Wiegand Ports, Anti-Passback, Multi-Door Interlock, Group Combination, Multi-Person Unlock, First-Card Unlock, Remote Verification, Fire Alarm Linkage, Built-in RTC + Watchdog, PoE or 12V DC, IP20/IK04, DIN Rail/Surface Mount, 210×106×50mm, 0.6kg
Usage: Multi-Door Access Control for Office Buildings, Industrial Parks, Schools & Campuses, Financial Buildings, Restricted Areas, Server Rooms, and Mid-Size Sites Requiring Centralized Door Management
