The **JT028-R-CE** is a high-performance, long-range **Passive RFID Reader Module** commonly used in industrial automation, logistics, and access control. It operates in the UHF (Ultra High Frequency) spectrum. --- ### 1. Key Technical Specifications The following table summarizes the core electronic characteristics of the module: | Parameter | Specification | | :--- | :--- | | **Operating Frequency** | 860 ~ 960 MHz (Global compatibility) | | **Protocol** | EPC Class 1 Gen 2 / ISO 18000-6C | | **Operating Voltage** | DC 3.3V - 5.0V | | **Read Distance** | 0 to 15 meters (Depends on antenna & tag) | | **Communication Interface** | TTL UART (RS232/RS485/Wiegand via adapter) | | **Power Consumption** | ~200mA (Operating), <10mA (Standby) | | **RF Output Power** | 0 to 26 dBm (Software adjustable) | --- ### 2. Electronic Components & Architecture The JT028-R-CE is built around a "System on Chip" (SoC) design optimized for RFID processing. #### A. RF Front-End * **Transceiver:** A highly integrated UHF RFID chip that handles modulation (sending data to the tag) and demodulation (receiving data from the tag). * **Power Amplifier (PA):** Boosts the signal to achieve long-range communication. * **Antenna Port:** Usually features an **IPEX (U.FL)** or **SMA** connector to attach external circular or linear polarized antennas. #### B. Digital Processing * **Microcontroller (MCU):** An onboard ARM-based or proprietary processor manages the EPC Gen 2 protocol stack, anti-collision algorithms (reading multiple tags at once), and data encryption. * **Memory:** Flash memory stores configuration settings (baud rate, power levels, frequency hopping tables). #### C. Interface & Connectivity * **VCC/GND:** Power supply pins. * **TX/RX:** Serial communication pins for interfacing with Arduino, Raspberry Pi, or PC. * **GPIO:** General Purpose Input/Output pins for triggering reads (e.g., via an IR sensor) or signaling (e.g., driving a buzzer/LED). --- ### 3. Pinout Description (Typical) While physical versions may vary slightly, the standard header usually follows this logic: 1. **VCC:** 3.3V - 5V Power Input. 2. **GND:** Ground. 3. **EN:** Enable pin (High to activate, Low for sleep). 4. **TXD:** Serial Data Out. 5. **RXD:** Serial Data In. 6. **GPIO/Wiegand:** For specific industrial access control signals. --- ### 4. Implementation Example (Python/Pseudo-code) To interact with the JT028-R-CE via a serial port, you typically send hex commands. ```python import serial # Initialize serial connection ser = serial.Serial('/dev/ttyUSB0', 115200, timeout=1) # Example Command: Read Single Tag (Hex) # [Header, Length, Command, Checksum] read_cmd = b'\xBB\x00\x22\x00\x00\x22\x7E' def read_rfid(): ser.write(read_cmd) response = ser.read(24) return response.hex() print("Scanning for tags...") print(read_rfid()) ```