The MA-485A is a versatile communications amplifier that facilitates communication between IS-489 suite stations and the vestibule panel, while providing flexible and convenient door opening options.
With its automatic level control (ALC) circuit, this amplifier ensures clear and intelligible voice communication in both directions. It thus guarantees optimal sound quality during exchanges.
In addition, the MA-485A offers the possibility of operating the door knock in alternating current (AC) or direct current (DC), thus allowing you to choose the opening mode most suitable for each situation and environment.
*In installations with multiple vestibules, the use of RL-401A relay units is required. A single RL-401A relay unit is designed to manage two vestibules.
Features:
- Designed for communication between IS-489 suite stations and the vestibule (lobby) panel, as well as for selective opening of doors.
- Compatibility with: IS-489-1, IS-401B, IS-51-2, IS-51-3
- Incorporates automatic level control (ALC) circuitry that provides clear, crisp two-way voice communication
- Provides AC (buzzing) and DC (quiet) door knocking action
Specifications:
- Power input, communication: 16 V AC 0.3 A or 18-28 V AC 0.2 A
- Power input, door strike: 8-30 V AC 1.5 A or 8-30 V AC, 1 A
- Output Power: Communication: 500 mW / 45 Ohms
- Output power, door strike: 3-30 VAC, 1.5 A or 3-30 VAC, 1 A
- Door knock time: 1-15 seconds, adjustable
