ASC4204B-S access controller for 4 doors (PoE, expandable)
The ASC4204B-S is an access controller from Dahua for 4 doors (one-way). The controller is the brain of the access system: the card readers and door locks connect to it, and the controller determines who may open which door, and when. It connects to the network via TCP/IP and can be managed with DSS Pro or SmartPSS Lite. A 4-door controller for DIN rail mounting, powered via PoE, with expandable alarm inputs and outputs (up to 8).
What this controller does
- Controls 4 doors (one-way); card readers connect via RS-485 and Wiegand
- Determines per person and per time period who may open which door; supports interlock, anti-passback and unlocking with multiple people
- Alarm for a tampered reader, a break-in or a door held open for too long
- Network via TCP/IP, can be managed with DSS Pro or SmartPSS Lite; powered via PoE
- Compact for DIN rail or surface mounting; settings are retained during a power failure
The details at a glance
| Access | |
| Type | Access controller, 4 doors (one-way) |
| Readers | 4x RS-485 and 4x Wiegand |
| Door functions | Interlock, multi-user, anti-passback |
| Capacity | |
| Users | 100.000 |
| Cards | 100.000 |
| Inputs and outputs | |
| Alarm input | 1, expandable to 8 |
| Alarm output | 1, expandable to 8 |
| Network and power | |
| Network | 1x Ethernet (TCP/IP) |
| Power supply | PoE (separate power supply for the lock required) |
| Consumption | Max. 3 W (controller) |
| Size | |
| Dimensions | 210,0 x 106,0 x 34,1 mm |
| Operating temperature | -30 to +60 degrees |
| Mounting | DIN rail or surface mounting |
| Model code | DHI-ASC4204B-S |
The full specification can be found in the Dahua datasheet, under the Downloads tab.
Frequently asked questions
What exactly does an access controller do?
The controller is the brain behind the door. The card readers and door locks connect to it; the controller checks the card or code, decides whether the door may open and operates the lock. It also records who went in and when.
Is a reader included, or do I need to buy one separately?
A reader is not included: you choose it separately and connect it via RS-485 or Wiegand. The ASR card readers in this category are compatible. Tell us about your situation and we will put together the right combination.
How many doors can I connect to this?
This version is for 4 doors (one-way). If you need more, you can use several controllers on the network or choose a larger one. Call or email us and we will work it out with you.
How is the controller powered?
Via PoE: power and data run over the network cable. A separate power supply is required for the door lock itself.
What do I use to manage users and permissions?
To manage cards, people and permissions, you use Dahua's free software: SmartPSS Lite for a small installation, DSS Pro for larger ones.
Where do I mount the controller?
On a DIN rail in a cabinet or surface-mounted, in a locked room inside the protected zone.
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