The ELV ST2212 is a smart 4-zone interface card essential for integrating traditional 100V amplifier/speaker zones into modern controlled PA systems (often IP-based systems using RS485 for local control). It receives control commands via RS485 and manages paging/BGM distribution, volume control override, and crucially, provides speaker line supervision (monitoring for Open and Short circuits) for each of the four zones. Available as a bare PCB (ST2212) or in a 1U rack-mount chassis (ST2212/U).
Key Features
- Speaker Line Supervision: Actively monitors connected 100V speaker lines, detecting Open-Circuit and Short-Circuit conditions with LED indication per zone.
- RS485 Communication: Robust communication protocol allows control from central controllers (like IP2100/8, ST2100/IP) over long distances.
- Volume Control Override: Supports 3 or 4-wire connections to volume controls (like A-C30R) enabling emergency override signals.
- 4-Zone Control: Manages audio distribution and supervision for four independent speaker zones.
- BGM/Paging Distribution: Intelligently routes Background Music (BGM) and Paging audio to zones based on control commands, with paging typically overriding BGM.
- Fault Isolation: Includes isolation relays to protect amplifiers in case of a detected short circuit on a speaker line.
- Manual Control: Features individual zone activation buttons and an All-Call bypass button for local testing or operation.
- Flexible Form Factor: Available as a PCB module for integration or pre-mounted in a 1U 19″ rack chassis.
Applications
An essential interface in IP or advanced Analog PA systems where centralized control and supervision of individual speaker zones are required. Perfect for distributing audio from central equipment racks to different building areas while monitoring speaker line integrity.
System Compatibility
- Controllers: Controlled via RS485 by ELV consoles like IP2100/8 or ST2100/IP.
- Amplifiers: Manages the 100V output from amplifiers (e.g., A-XXXD series) distributing it to zones.
- Speakers: Supervises standard 100V speaker lines connected to its outputs.
- Volume Controls: Interfaces with A-C30R for override functionality using 3 or 4-wire connections.
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