ASC4204B-S 4-Door Access Controller with Multi-Auth, PoE, 100,000 Users and Advanced Control - Dahua
The ASC4204B-S is a professional access controller designed for advanced security systems, featuring centralized management of up to 4 doors and high-capacity multi-user support. It integrates multiple authentication methods such as badge, password, fingerprint, and QR code , ensuring maximum operational flexibility and security. With a capacity of up to 100,000 users and 500,000 recorded events , it is ideal for corporate environments and complex facilities. It offers advanced functions such as anti-passback, multi-factor authentication, and real-time monitoring , improving access control. TCP/IP connectivity with PoE and ONVIF protocols ensures simple integration and efficient remote management. Dahua
ASC4204B-S | ONE-WAY DOOR ACCESS CONTROL

The Dahua ASC4204B-S is an advanced access controller designed for professional security management, with control of up to 4 doors and centralized multi-user management, ideal for corporate and industrial environments. It supports multiple authentication with badge, password, fingerprint and QR code , ensuring maximum flexibility and security. With a capacity of up to 100,000 users and 500,000 events , it allows detailed and reliable access monitoring. It integrates advanced functions such as anti-passback, multi-factor authentication and intelligent alarms , improving the level of protection. TCP/IP connectivity with PoE support and ONVIF protocols ensures simple integration and efficient remote management.
Main specifications:
- Management of up to 4 doors with centralized access control
- Multiple authentication: badge, password, fingerprint and QR code
- High capacity: up to 100,000 users and 500,000 events
- Advanced features: anti-passback, multi-factor authentication, real-time monitoring
- Intelligent alarms: intrusion, tampering, coercion and unauthorized access
- TCP/IP network connectivity with PoE and ONVIF compatibility
Further details
✅ System:
The controller integrates an embedded processor with a stable Linux system and advanced IPv4/IPv6, TCP and ONVIF network protocols , ensuring high reliability, interoperability and centralized management via web and API.
✅ Functions:
It offers advanced multi-method access control features with badge, password, fingerprint and QR code, as well as multi-factor authentication, anti-passback and real-time monitoring , ideal for high-security environments.
✅ User :
It supports different profiles such as general users, VIP, guests and blacklists , allowing flexible and customized access management based on authorization levels.
✅ Alarm:
Technical data sheet
| MODEL | ASC4204B-S |
| System | |
| Main Processor | Embedded Processor |
| Network Protocol | IPv4;UDP;P2P;IPv6;TCP |
| OSDP Protocol | Yes |
| Interoperability | ONVIF PROFILE C |
| SDK | Yes |
| API | Yes |
| Basic | |
| Product Type | Controller |
| Buzzer | Yes |
| Casing Material | PC+ABS |
| Function | |
| Verification Method | Card;Password;Fingerprint;Remote;QR Code |
| Period List | 128 groups |
| Holiday Period | 128 groups |
| Network Update | Yes |
| First User Unlock | Yes |
| Remote Verification | Yes |
| Restricted List/Trusted List | Yes |
| Peripheral Card Reader | Supports 4-channel RS-485 card readers and 4-channel Wiegand card readers. |
| Multi-door Interlock | Yes |
| Multi-user Authentication | Yes |
| Real-time Monitoring | Yes |
| Multi-factor Authentication | Yes |
| Web Configuration | Yes |
| Unidirectional or Bidirectional | Unidirectional |
| User | |
| User (Card) Type | General user, VIP user, patrol user, guest user, blocklist user, other users, custom user 1 and custom user 2 |
| Capacity | |
| User Capacity | 100,000 |
| Fingerprint Capacity | 10,000 |
| Card Capacity | 100,000 |
| Record Capacity | 500,000 |
| Port | |
| RS-485 | 5 ports. 4 for card readers, and the remaining 1 is for the extension port. |
| Wiegand | 4-channel input |
| Network Port | 1 RJ-45, 10 Mbps/100 Mbps self-adaptive |
| Alarm Input | 1 channel; expandable to 8 channels when connected to an external alarm module. |
| Alarm Output | 1 channel; expandable to 8 channels when connected to an external alarm module. |
| Alarm Linkage | Yes |
| Exit Button | 4 channels |
| Door Status Detection | 4 channels |
| Lock Control | 4 channels |
| Alarm | |
| Anti-pass Back | Yes |
| Tamper Alarm | Yes |
| Duress Alarm | Yes |
| Door Sensor Timeout | Yes |
| Intrusion | Yes |
| Illegal Card Exceeding Threshold | Yes |
| Duress Fingerprint | Yes |
| General | |
| Power Supply | Standard PoE; 12 VDC 1A(no peripheral devices |
| Power Consumption | ≤ 3W; it might alter if other devices are connected |
| 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 (10.04" × 6.54" × 3.43") (L × W × H, 1 in inner carton) 512 mm × 269 mm × 196 mm (20.16" × 10.59" × 7.72") (L × W × H, 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) |
| Installation | Surface Mount;Guide Rail Mount |


