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KC868-A2 with SIM7600E – Unable to operate after multiple attempts - Printable Version

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+--- Thread: KC868-A2 with SIM7600E – Unable to operate after multiple attempts (/showthread.php?tid=8433)

KC868-A2 with SIM7600E – Unable to operate after multiple attempts - panarosa - 08-09-2025


  1. Development Environment Setup
    • Arduino IDE (tested with both version 1.x and 2.x)
    • Official ESP32 core installed via URL:

      Code:
      https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json

    • Selected board: ESP32 Dev Module
    • Baud rate set to 115200
  2. Sketch Upload
    • Tested official KinCony sketches for KC868-A2 with SIM7600
    • Tested custom sketches for sending AT commands
    • Tested with PSRAM disabled to eliminate


    • Compilation and upload completed successfully → ESP32 is working correctly
  3. Connections and Power Supply
    • KC868-A2 powered with 12V as per manual
    • LTE antenna connected to MAIN port of SIM7600 (not AUX/GNSS)
    • Verified presence of power and indicator LEDs:
      • Red power LED solid on
      • Green modem LED blinking continuously
  4. SIM Cards
    • Tested two different SIM cards in two different SIM7600E modules → no response
    • SIM cards confirmed working in a mobile phone
    • SIM PIN disabled
    • Contacts cleaned
    • Correct insertion verified
  5. AT Command Tests from ESP32

    → no response
  6. Serial Monitor shows nothing or “modem not found”
  7. Alternative Checks
    • Attempted direct connection via USB MODEM to PC (drivers not easily available)
    • Tried alternative SIM slots and different LTE antennas
    • Evaluated alternative GSM modules (SIM800C, SIM800L) → working in other projects
    • Conclusion:
      The ESP32 works and communicates correctly via USB, but the SIM7600E module does not respond to any AT command, even after testing with two different units, proper power supply, and a suitable LTE antenna.


RE: KC868-A2 with SIM7600E – Unable to operate after multiple attempts - admin - 08-09-2025

already repied in another thread.