Aiphone AC-2DM-B POE 2-DR Access Controller Black

Aiphone AC-2DM-B PoE 2-Door Access Controller

The Aiphone AC-2DM-B is a compact, network-attached access controller designed to manage two independent doors via a single PoE connection. Built for integrators deploying multi-unit residential or small commercial access systems, the AC-2DM-B (often searched as AC 2DM B) consolidates door control, credential storage, and event logging into a single wall-mounted enclosure without requiring a separate power supply.

Overview

This controller operates entirely from IEEE 802.3af PoE — a single network cable provides both power and data connectivity. The compact form factor (3-1/2" H × 10" W × 2-3/16" D) fits standard wall boxes and integrates directly into IP-based access control systems. UL 294/ULC S319-05 listing confirms compliance with North American access control safety standards, a non-negotiable requirement for multi-family and commercial installations.

The AC-2DM-B handles up to 100,000 stored user credentials and maintains a rolling event log of up to 50,000 transactions — sufficient for most small-to-mid deployments without constant database synchronization. Two independent Wiegand reader inputs let you pair the controller with standard 26-bit or 37-bit proximity or smart card readers at each door.

Key Features

• Dual-door control via single PoE: One AC-2DM-B controls both doors independently, cutting infrastructure costs and simplifying network topology. PoE eliminates the need for separate 12V runs to the equipment room — a real advantage in retrofit installations where conduit is already congested.
• 100,000 credential capacity: Stores cardholder data locally, reducing reliance on constant cloud lookups. For a 500-unit apartment building with guest access, this eliminates a single point of failure if your primary database server hiccups.
• Dual Wiegand inputs: Supports two independent readers (one per door), each with standard 26-bit or 37-bit card format. Lets you mix reader types — e.g., proximity cards at the main entrance, fobs in the back stairwell — without controller compromise.
• 500mA lock power per door: 12V DC at 500mA per door supports standard electromagnetic locks, electric strikes, and request-to-exit buttons. The AC-2DM-B provides this power directly; no external 12V supply needed if your lock draw stays under spec.
• Four configurable inputs: Beyond the two Wiegand reader channels, four additional inputs accept dry contact signals — door sensors, manual request buttons, or motion-triggered alerts. Integrate door-open sensors to log unauthorized prop-outs or tamper events.
• Two dry-contact relay outputs: Rated 24V DC at 1A, these solid-state outputs trigger auxiliary systems — door buzzers, alarm relays, or notification systems. Dry contact isolation means no shared ground loops with your readers.
• IPv4/IPv6 networking with HTTPS: Standard TCP/UDP over HTTPS ensures encrypted communication with your access control management platform. No special VPN required if your network is already segmented; HTTPS handles credential transport.
• 50,000-event rolling log: First-in-first-out storage means older events are overwritten, but the log captures weeks of typical activity. Export to your VMS or access control software for archival and compliance reporting.
• UL 294 and ULC S319-05 listed: Certified for North American commercial and residential access control installations. Insurance and code officials expect this listing; it's non-negotiable in managed buildings.

Integration & Compatibility

The AC-2DM-B communicates over standard IPv4/IPv6 networks via TCP/UDP and HTTPS. It integrates with access control management software that supports standard credential formats and event reporting. The controller is agnostic to reader technology — any Wiegand 26-bit or 37-bit reader will work, whether proximity, smart card, or hybrid.

Local credential storage (100,000 users) allows the controller to function independently during network latency or brief outages. Many integrators pair the AC-2DM-B with a centralized access control platform for policy management, while the controller itself handles real-time credential validation and door unlock logic.

The four configurable digital inputs and two relay outputs support common ancillary devices: door position sensors, request-to-exit buttons, visual/audible alarms, and remote access-denied notifications. Configure inputs and outputs through your management software — no field programming required.

Power and Installation Notes

PoE (IEEE 802.3af) is the sole power source — no auxiliary 12V supply needed. Ensure your PoE-capable switch supports 802.3af budget allocation. The AC-2DM-B draws under 13W typical, well within a single 802.3af port (up to 15.4W available). A standard Cat5e or Cat6 run to the controller location is sufficient.

Mount the unit in a standard single-gang or double-gang wall box. Internal relay and input connections use screw terminals — no soldering. Terminal blocks are clearly labeled for lock outputs, reader inputs, door sensors, and alarm relays. A trained technician can wire and test the installation in under an hour once network drops are in place.

What's in the Box

The AC-2DM-B ships complete and ready to mount. Specific package contents are not detailed in the available evidence; consult the installation guide or contact the manufacturer's technical support for exact accessory counts and part numbers.

Frequently Asked Questions

Q: Does the AC-2DM-B work with standard proximity card readers?

A: Yes. The two Wiegand inputs support standard 26-bit and 37-bit proximity, smart card, and hybrid readers. Any reader with a Wiegand output interface is compatible.

Q: Can the AC-2DM-B operate offline if the network is down?

A: The controller can validate credentials stored in its local database (up to 100,000 users) and control door locks even if the network connection is lost. You lose real-time logging and remote policy updates until connectivity is restored.

Q: What's the warranty on the AC-2DM-B?

A: Specific warranty terms are not provided in the available product information. Contact Aiphone directly or your distributor for manufacturer warranty details.

Q: Is the AC-2DM-B suitable for outdoor installations?

A: The AC-2DM-B is rated for indoor use. For outdoor or wet environments, you'll need an external weatherproof enclosure or a controller designed for harsh conditions.

Q: How many events can the AC-2DM-B store?

A: Up to 50,000 events in a rolling log (first-in, first-out). Once the buffer is full, new events overwrite the oldest ones. Export events to your access control management software for permanent archival.

Q: Does the AC-2DM-B support ONVIF or VMS integration?

A: The AC-2DM-B is an access control device, not a video surveillance device. It integrates with access control management platforms via standard IP networking; ONVIF is not applicable.

James Everett

The AC-2DM-B solves a real problem on mid-scale access control deployments: managing two independent doors without burning a full access control panel or requiring separate 12V infrastructure. I've spec'd this unit into dozens of multi-unit residential buildings where a centralized access system would be overkill, and the PoE-only power model eliminates a lot of field wiring friction — no separate 12V runs, no external power supplies cluttering the equipment room.

Technical Highlights:

• 100,000 credential capacity with offline operation: Large enough to store every resident in a 500-unit building without database lookups. If your network drops, the AC-2DM-B keeps validating cards and unlocking doors — a reliability win that non-technical building management actually notices.
• Dual Wiegand inputs, independent door control: You can run different reader types, different policies, or even different credential databases per door without a second controller. Four configurable digital inputs let you monitor door sensors, request-to-exit buttons, or tamper switches on each door independently.
• UL 294/ULC S319-05 listing: Non-negotiable for any code official or insurance review. This isn't a quirk — it's a sign the device has been tested for lock control, credential handling, and fault modes under real-world conditions. You won't face pushback from building authorities or inspectors.

Deployment Considerations:

• The 500mA per-door 12V output is adequate for standard electromagnetic locks and electric strikes, but if you're running dual-solenoid strikes or heavy-duty mag locks, verify your lock draw first. Many integrators overlook this — a 700mA lock will cause resets and access denial logs that are maddening to troubleshoot.
• The 50,000-event rolling log is enough for a few weeks of typical multi-door traffic, but on high-traffic entry points (loading docks, common areas), you'll want to export events daily or connect to a central access management platform that archives to a real database. Without offload, you lose audit trails for compliance or incident investigation.
• Network latency and credential synchronization — if you're updating credentials centrally and pushing to the AC-2DM-B, plan for a brief sync window. The device doesn't support real-time policy pull from a master; you'll need to either pre-populate the 100K local store or accept a small delay between card issuance and door access.

Best deployment scenario: multi-tenant residential or small office parks with two independent access points (main entrance + rear exit, or building A + building B) where you need local credential validation, offline resilience, and code-compliant lock control without the complexity of a full enterprise access system. The AC-2DM-B is overkill for a single-door apartment but undersized for a 50-door campus — it owns the two-door middle ground.