Aiphone DA-1MD Audio Handset Master Station

Aiphone DA-1MD Audio Handset Master Station

The Aiphone DA-1MD is a dedicated audio handset designed for the DA Series intercom system, providing full-duplex voice communication and integrated access control functionality. This master station component serves as the primary user interface for receiving and managing calls within multi-unit residential or commercial installations.

Overview

The DA-1MD delivers privacy-focused audio communication through a handset design that isolates conversations within the unit. As a master station component in the Aiphone DA Series ecosystem, it integrates seamlessly with entrance stations, door stations, and power supply modules to create a complete audio intercom network. The handset-based architecture ensures operators maintain control over communication flow while managing access via integrated door release functionality.

Key Features

• Full-Duplex Audio Handset: Enables simultaneous two-way conversation for natural, responsive communication without transmission delays
• Service Button Control: Dedicated button interface for managing external devices, allowing integration with auxiliary systems or relay-controlled equipment
• Integrated Door Release: Button-operated door release powered by the connected door station, enabling access control directly from the master station without separate activation
• Call Tone Volume Control: Adjustable incoming call alert volume with mute indicator to accommodate different environmental conditions and user preferences
• Privacy-Focused Design: Handset form factor ensures conversations remain private and are not broadcast to the surrounding environment
• Simple Wiring Integration: Supports dual-conductor cabling from entrance and tenant stations using either shielded or non-shielded wire options depending on installation requirements

Wiring & Distance Specifications

The DA-1MD connects to entrance stations and power supplies using standard two-conductor cabling. For connections from the power supply to the tenant station, Aiphone #871802 (2-conductor, low capacitance, polyethylene insulation, solid, non-shielded) is recommended. Maximum transmission distances depend on wire gauge: at 22 AWG, power supply to tenant station reaches 180 feet; upgrading to 18 AWG extends this to 510 feet. Cumulative distance from entrance station to power supply supports 360 feet at 22 AWG or 1,020 feet at 18 AWG. For shielded installations requiring electromagnetic interference protection, Aiphone #822202 (2-conductor, overall shield) provides an alternative approach.

Integration & Compatibility

The DA-1MD functions as a core component within the Aiphone DA Series modular architecture. It pairs with DA Series entrance stations (including DA-1DS single-call and DA-2DS two-call units), complementary master stations, and power supply systems to build scalable intercom networks. This master station is compatible with door release devices such as the EL-12S 12V AC electric door strike and supports power conditioning via Aiphone PT-1211CA 15V AC plug-in transformers for stable system operation.

Ted Perry

Perspective based on aggregated IP Security Depot and affiliated engineering team experience.

I've specified the Aiphone DA-1MD for several multi-unit residential projects, and the handset architecture delivers solid performance in privacy-sensitive deployments. The full-duplex audio ensures residents don't experience the communication delays common in simplex systems, which translates to better user experience and fewer support callbacks.

Technical Highlights:

• Full-Duplex Communication: Simultaneous two-way audio eliminates the push-to-talk workflow, making the handset feel natural to operators accustomed to traditional telephone interfaces
• Integrated Access Control: The door release button powered directly by the entrance station removes dependency on separate relay modules for basic access scenarios, simplifying the control logic
• Flexible Wiring Options: Support for both shielded and non-shielded cable gives installers flexibility to manage electromagnetic noise in electrically dense environments while maintaining cost efficiency in clean installations

Deployment Considerations:

• Plan wire runs carefully—the 180-foot (22 AWG) or 510-foot (18 AWG) distance limits from power supply to tenant station require strategic equipment placement in larger buildings. Use 18 AWG wire in extended runs to avoid voltage drop and signal degradation
• The service button integration assumes external relay-controlled devices are available; confirm compatibility with any auxiliary systems before installation to avoid redesign after rough-in
• Verify entrance station compatibility (DA-1DS or DA-2DS) and confirm power supply capacity matches the total number of tenant stations to prevent performance issues

The DA-1MD is a practical choice for integrators building DA Series systems in residential or small commercial environments where privacy-focused audio communication and straightforward access control are the primary requirements. The handset design keeps costs predictable while maintaining reliability, and the modular cabling approach simplifies both installation and future expansion.