Key Features:

• Two-Way Wireless Technology: Enables full two-way communication with compatible sensors – each device can both transmit and receive. This improves signal reliability and allows features like acknowledgements, device supervision, and interactive status (ideal for keyfobs, two-way smoke/CO detectors, etc.).
• Adds 128 Wireless Zones: Expand your system with up to 128 wireless zones using ELK’s two-way sensors and peripherals. Protect every door, window, and critical area with wireless devices that stay in constant communication with your panel.
• 902–928 MHz RF Band: Secure, spread-spectrum operation in the 900 MHz band reduces interference. Compatible with ELK’s full line of two-way wireless sensors and devices for the E27 platform (e.g., two-way motion sensors, keychain remotes with feedback, wireless sirens, life safety sensors).
• Plug-In or Remote Mount: Connects directly to the E27 Alarm Engine’s on-board wireless receiver connector for a clean, internal installation. Alternatively, use the ELK-AEXRFA bus adapter to mount the transceiver in a remote location or to add multiple receivers on the data bus for distributed coverage.
• Status LEDs: Built-in LEDs indicate power, transmission (TX), and reception (RX) activity, so you can easily confirm the transceiver is communicating properly during setup and maintenance.
• Multi-Receiver Support: Scale up to 4 two-way receivers on one E27 system. This is perfect for expansive properties or multi-story buildings – you can place additional AERF9 units (via bus adapters) to eliminate wireless dead spots and ensure every two-way sensor stays connected.

Technical Specifications:

• Frequency Range: 902–928 MHz spread spectrum for two-way RF communication.
• Wireless Zones: Supports up to 128 total wireless zones (shared among two-way sensors) per receiver.
• Installation Options: Plugs into the E27 board’s wireless port or attaches to the RS-485 four-wire data bus via the ELK-AEXRFA adapter for remote mounting.
• Power Draw: 12 VDC from panel.
• Current: ~35 mA (listening), up to 85 mA when transmitting. The transceiver conserves energy by only drawing higher current during brief two-way communication bursts.
• Indicators: On-board LED indicators for Status, Enrolled RF, and All RF activity (multiple LEDs provide detailed diagnostics of the wireless link).
• Compatibility: Works with ELK two-way wireless sensors (model series 900MHz) – ensuring full integration with devices like ELK two-way smoke detectors, keyfobs, sirens, and more. (Not compatible with one-way 319.5 MHz sensors – use ELK-AERF3 for those.)
• System Capacity: Up to four AERF9 units can coexist on the system bus (one on the main board plus three via bus adapters). Each includes an antenna and mounting hardware for optimal placement.