No response when reading radar data via USB-to-serial adapter and upper computer software

supply voltage matches the device specification; abnormal voltage prevents normal operation.

Check wiring:

• TTL communication: Cross wiring rule – RX ↔ TX.

• RS485 communication: Straight wiring rule – A to A, B to B.
  Ensure no loose or misconnected terminals.

Test alternative baud rates (factory default: 9600; try 115200 or other common rates). Restore factory settings and retest if no reply is received.

Troubleshoot serial port hardware:

• For TTL ports, run self-transmit/receive loopback test to validate serial transceiver functionality.

• Swap serial adapters or host PCs for cross-verification to rule out faulty serial hardware.

Update the upper computer software to the latest version UartTool_20260103; older versions have compatibility bugs.

Measure operating current in series with a multimeter across the radar power terminals:

• Zero current indicates hardware failure; return unit for repair.

• Insufficient current means the power supply cannot drive the radar; upgrade power adapter to meet power requirements.