DYP-A02YYTW-V2.0 UART-Controlled Ultrasonic Sensor 3–450cm IP67 Waterproof

In UART-controlled mode, the sensor only transmits distance data when explicitly requested by the host microcontroller via a serial command. In UART-automatic mode, the sensor continuously outputs distance readings at a fixed interval without requiring host prompting, simplifying code for constant monitoring applications.

The RS485 interface uses a half-duplex, two-wire (A/B) differential signal. Connect the sensor's RS485 data lines to your PLC's RS485 port, ensuring proper termination and common ground. The module typically uses a standard Modbus RTU protocol, requiring configuration of the sensor's address and baud rate via UART commands before use on the network.

The 3 cm dead band is a non-measurement zone close to the transducer face caused by physical ringing of the ultrasonic element. It cannot be reduced or disabled, as it is a fundamental limitation of the piezoelectric ceramic's recovery time. For measuring distances shorter than 3 cm, a different sensing technology (e.g., infrared proximity) is required.

Provide a stable 3.3V or 5V DC supply to the VCC and GND pins. The PWM output pin provides a variable duty cycle pulse where the pulse width is directly proportional to the measured distance. Connect this pin to a microcontroller's digital input capable of pulse-width measurement. Ensure total cable length is minimized for the PWM signal to maintain signal integrity.