The **XH9-019PKC-R** is a 900 MHz commercial-grade wireless radio modem manufactured by Digi International (formerly MaxStream). It belongs to the **XStream** series and is designed for long-range, low-speed data transmission in industrial and commercial environments. --- ### 1. Core Technical Specifications The device operates as a serial-to-radio converter, allowing devices to communicate over long distances without physical cables. | Feature | Specification | | :--- | :--- | | **Frequency Range** | 902 - 928 MHz (ISM Band) | | **Data Rate (Over-the-air)** | 9.6 kbps or 19.2 kbps | | **Interface** | RS-232/485 (via the PKC-R interface board) | | **Indoor Range** | Up to 1500 ft (450 m) | | **Outdoor Range (Line of Sight)** | Up to 7 miles (11 km) with high-gain antenna | | **Transmit Power** | 100 mW (20 dBm) | | **Input Voltage** | 7V - 18V DC | --- ### 2. Component Breakdown The "XH9-019PKC-R" part number reveals specific details about the internal electronic configuration: * **XH9:** Refers to the **9XStream** radio module integrated inside. * **019:** Indicates the internal data rate (19.2 kbps). * **PKC:** Denotes the "Plug-and-Play" (Packaged) version, typically housed in an enclosure with a serial interface. * **R:** Signifies the **RS-232/485** interface type for the external connection. --- ### 3. Key Electronic Features #### Frequency Hopping Spread Spectrum (FHSS) To avoid interference from other 900 MHz devices (like cordless phones or baby monitors), the XH9-019PKC-R uses FHSS. It rapidly switches frequencies within the 902-928 MHz band, ensuring a robust connection even in "noisy" RF environments. #### Serial Interface Board Unlike the raw OEM modules, the "PKC-R" version includes an internal carrier board that handles: * **Voltage Regulation:** Converts higher input voltages to the 5V/3.3V required by the radio. * **Signal Level Shifting:** Converts standard RS-232 voltage levels (+/- 12V) to logic levels used by the radio. * **LED Indicators:** Usually features Power (Green), Transmit (Red), and Receive (Yellow) LEDs for diagnostic purposes. #### Antenna Connection It typically features an **RPSMA (Reverse Polarity SMA)** connector. This is a critical electronic part as it dictates the impedance (50 Ohms) and allows for the attachment of various whip or Yagi antennas to extend range. --- ### 4. Typical Applications * **SCADA Systems:** Monitoring remote water tank levels or electrical grids. * **Industrial Automation:** Wireless PLC (Programmable Logic Controller) communication. * **Remote Sensing:** Collecting data from weather stations or agricultural sensors. * **GPS Surveying:** Transmitting RTK corrections between a base station and a rover.