The **T18-R** is a specialized wireless DMX receiver, commonly used in the professional lighting and stage effects industry. It is designed to replace physical XLR cables by receiving DMX512 data wirelessly via radio frequency. --- ### 1. Core Internal Components The T18-R consists of several critical electronic modules that handle signal processing and power management. | Component | Function | | :--- | :--- | | **RF Transceiver Module** | Operates on the 2.4GHz ISM band. It detects and captures the wireless signal. | | **MCU (Microcontroller)** | The "brain" that decodes the radio packets back into DMX512 protocol data. | | **Voltage Regulator** | Converts the input voltage (usually 5V DC) into stable 3.3V required by the logic chips. | | **Tri-color LED Indicator** | Provides visual feedback on signal strength and ID group status. | | **Antenna** | An omnidirectional 2.4G antenna (usually 2dBi) used to increase reception range. | --- ### 2. Technical Specifications Understanding the electrical limitations is vital for integration. * **Operating Frequency:** 2.400 - 2.525 GHz (79 channels, frequency hopping). * **Input Voltage:** 5V DC (standard). * **Sensitivity:** -94dBm (high sensitivity for long-distance reception). * **Output Signal:** RS485 / DMX512 (Standard 3-pin or 5-pin XLR). * **Communication Distance:** Roughly 400 meters (open air, line of sight). --- ### 3. Connection Pinout (Typical) If you are looking at the internal header or the XLR interface, the electronic mapping is usually: 1. **Pin 1 (GND):** Ground / Reference. 2. **Pin 2 (Data -):** Inverted DMX signal. 3. **Pin 3 (Data +):** Non-inverted DMX signal. 4. **VCC:** Power input (only if the receiver is built-in/internal). --- ### 4. How the "ID Code" Logic Works The T18-R uses a color-coded ID system to pair with transmitters. This is handled electronically by the MCU: * **Red:** ID Group 1 * **Green:** ID Group 2 * **Blue:** ID Group 3 * **Yellow/Purple/Cyan/White:** ID Groups 4-7 When the receiver detects a frequency-hopping signal that matches its programmed ID, it converts the RF packets into a differential signal for the lighting fixtures.