Atrium A22K (Krypto) is a 2‑door / 4‑reader IP access controller and expander designed for mid‑market to enterprise deployments. It supports standard Wiegand readers and CDVI KRYPTO high‑security readers with DESFire credentials and end‑to‑end AES encryption. The controller includes an embedded HTTPS web server and is managed via the free ATRIUM management software and mobile app.

• Controls up to 2 doors (4 readers) and can be used in expanded multi‑controller systems.
• End‑to‑end AES encryption with secure HTTPS management interface.
• Supports CDVI KRYPTO readers and DESFire EVx credentials to reduce card cloning risk.
• On‑board Ethernet (IP) and RS‑485 bus for expanders (long RS‑485 runs supported).
• Built‑in PSU with battery charging; supports a single 12 V DC 7 Ah backup battery.
• 2 × Form‑C relays (dry contact), 2 lock outputs and multiple supervised inputs (6 multipurpose, expandable to 12).
• Includes free ATRIUM management software, mobile app and floor‑plan manager for configuration and remote management.

Use cases: Ideal for commercial sites, multi‑site access control networks, small/medium enterprise projects, and installations requiring strong anti‑cloning credential protection.

Installation & compliance: For safety and warranty reasons the unit should be installed by a qualified security installer or electrician. Refer to the manufacturer datasheet and user manual for detailed wiring, certification (IP2X listed) and configuration instructions.