DFRobot URM12 Ultra Long Range Ultrasonic Distance Sensor (70-1500cm, RS485 Modbus)

The URM12 uses an RS485 physical layer interface and communicates via the Modbus-RTU protocol. This industrial standard allows for reliable, noise-immune data transmission over distances up to 1200 meters and enables easy integration with PLCs, SCADA systems, and other devices supporting Modbus.

The sensor operates on a wide 9 to 24 VDC power supply, making it compatible with common 12V or 24V industrial power systems. It has a rated power consumption of 4.8W. Ensure your power source can provide sufficient current, especially over long cable runs where voltage drop may occur.

Yes, the URM12 is housed in an IP65-rated ABS enclosure, which protects it against dust ingress and low-pressure water jets from any direction. It is suitable for outdoor use and damp industrial environments, but it is not submersible and should not be exposed to sustained high-pressure water.

The sensor typically comes with a default Modbus slave address (e.g., 0x01). Configuration for address, baud rate, and parity is usually done via specific Modbus function commands sent to the device. Consult the official DFRobot URM12 datasheet for the exact register map and configuration procedure.

The maximum 15-meter range is achieved under ideal conditions: a large, flat, solid target perpendicular to the sensor. Factors like target material (soft, absorbent), angle, size, ambient temperature, and airborne particulates (dust, fog) can reduce the effective range. The narrow 15° beam helps but requires careful alignment.