• Operates on a 433.92MHz frequency, exempt from European licensing.
• Handles decoding and interfacing internally.
• Supports 15 control codes per transmitter with four outputs.
• Interfaces with logic, microcontrollers, or LEDs.
• Can learn and remember up to 16 transmitters, even without power.
• Indicates Learn function and low transmitter voltage.
• Offers momentary or 10ms pulse output modes.
• High-performance receiver can function independently.
• 5VDC supply in a DIL module form factor.

• Used in RF interfaces for security and alarm systems.
• Facilitates status reporting and monitoring of secure systems.
• Applicable in industrial controls, HVAC, and door entry systems.
• Enables simple On/Off switching.

The KRX2 is a UHF FM receiver and rolling code decoder/interface module for secure wireless remote control and keyless security systems, compatible with KTX2 and KFX2 products.

Key pins include:

• Pin 1: RSSI - Analogue output for signal strength.
• Pin 5: LRN (OUT) - Digital Learn function indicator.
• Pin 8: +5V - Power supply input.
• Pin 10: RF IN - Antenna input.

Ensure supply voltage does not exceed 5.5V. Connect with a mode switch and learn button for experiments.

Initiate a 5-second learning window by pressing the Learn button. The function code is stored and indicated by the Learn LED.

Learned transmitters activate outputs S0 – S3, supporting 10ms single-shot and momentary modes.

Hold the Learn button for over 5 seconds to clear all transmitters. Individual removal is not possible.

Uses Manchester encoding with a 28-bit serial number and 32-bit encrypted hop-code for security.

Provides a 60dB range indication of signal strength for link quality assessment.

• Operating temperature: -20°C to +70°C.
• Storage temperature: -40°C to +100°C.
• DC supply: -0.1V to +5.5V.

Supply voltage: 4.5V to 5.25V; RF sensitivity: -114 dBm.

Ensure good RF layout practice with direct ground returns and short connections.

Recommended antennas: Helical, Loop, and Whip, each with specific performance characteristics.

Avoid metal proximity; ideal placement is protruding from the product top.

Radiometrix Ltd provides contact details for inquiries, including address, phone, fax, email, and website.

Document is copyrighted by Radiometrix Ltd. Liability is disclaimed for product use, and changes may occur without notice.

Products must comply with the R&TTE Directive post-April 2001. Further details are available on the Ofcom website.

Contact information for Ofcom and the European Radiocommunications Office is provided for regulatory guidance.