The **HORNETPRO-8R4** is a rugged, high-performance industrial remote control receiver manufactured by RF Solutions. It operates on the 868MHz frequency band and is designed for switching electrical loads wirelessly. ### 1. Key Specifications The following table highlights the primary electronic and technical characteristics of the HORNETPRO-8R4: | Feature | Specification | | :--- | :--- | | **Operating Voltage** | 12V - 32V AC or DC | | **Frequency** | 868.35 MHz | | **RF Sensitivity** | -121 dBm | | **Output Channels** | 4 Channels (Relay Outputs) | | **Relay Contact Rating** | 5A @ 230VAC / 30VDC | | **Range** | Up to 200m (Line of Sight) | | **Enclosure Rating** | IP68 (Waterproof/Dustproof) | --- ### 2. Core Electronic Components #### A. RF Receiver Module The heart of the device is a highly sensitive FSK (Frequency Shift Keying) receiver. It utilizes a narrow-band 868MHz frequency, which minimizes interference from other wireless devices (like 433MHz consumer electronics or 2.4GHz Wi-Fi). #### B. Relay Outputs (4-Channel) The unit features four independent electromagnetic relays. * **Configuration:** These are typically "Volt-Free" (Dry) contacts, meaning they act as a simple switch. * **Operating Modes:** The electronic logic allows the relays to be configured in different modes via internal jumpers or "learn" buttons: * **Momentary:** The relay is active only while the transmitter button is pressed. * **Latching:** One press turns the relay ON; the next press turns it OFF. #### C. Power Management Circuitry The board includes an internal bridge rectifier and voltage regulator. This allows the device to accept a wide range of input voltages (12V to 32V) without polarity issues, making it compatible with both automotive/marine (DC) and industrial control (AC) power supplies. #### D. Antenna System The unit comes with an internal helical antenna, but it features a standard screw-terminal connection for an external SMA antenna if extended range or mounting inside a metal enclosure is required. --- ### 3. Wiring Configuration The terminal blocks are usually labeled for easy integration. Below is a simplified representation of the wiring logic: ```text [ Power In (+) ] ---- [ 12-32V AC/DC ] [ Power In (-) ] ---- [ Common/Ground ] [ Relay 1 - NO ] ---- [ Load Input ] [ Relay 1 - COM] ---- [ Power Source for Load ] ... (Repeated for Relays 2, 3, and 4) ```