If you are working with IoT modules like the SIM800, SIM7000, or SIM7600 series, you may have encountered the following cryptic message in your serial debug log:
When linking a Siemens, Allen-Bradley, or Delta PLC to a Variable Frequency Drive (VFD) or smart sensor via RS-485 or RS-232. handshaking... error unexpected response 0x68
Lower your (e.g., from 115200 to 9600) to test stability. If you are working with IoT modules like
Avoid using front-panel USB ports on desktop computers. Always plug directly into the at the back. Always plug directly into the at the back
The error is a specific communication failure typically seen when using certain firmware flashing tools (like Miracle Box , SP Flash Tool , or Infinity-Box ) to interact with mobile devices .
What you are performing (e.g., bypassing FRP, flashing firmware, unbricking).
ser = serial.Serial( port='/dev/ttyUSB0', baudrate=9600, bytesize=8, parity='N', # or 'E' for even stopbits=1, timeout=2 )