Generic XY-MD02 Temperature & Humidity Transmitter Modbus - RS485 DIN Rail Mount

The module accepts a wide DC input range from 5V to 30V, making it compatible with common 12V or 24V industrial power supplies as well as 5V logic rails. It includes internal protection against reverse polarity and voltage spikes.

Connect the RS485 A and B lines to your host adapter (e.g., USB-to-RS485). Use standard Modbus RTU commands to read holding registers; the sensor's documentation provides the specific register addresses for temperature and humidity values. Baud rate, parity, and stop bits are configurable.

Yes, but you will need an RS485 to TTL/UART converter module (e.g., MAX485) to interface with the 5V or 3.3V serial pins of your microcontroller. You can then use either the Modbus RTU library or the simpler ordinary serial protocol by sending the appropriate query commands.

The integrated SHT20 sensor provides humidity readings from 0% to 80% RH with a typical accuracy of ±3% RH. Note that prolonged exposure to condensing environments (above 80% RH) may affect sensor longevity and calibration.

The transmitter features a spring-clip latch for standard DIN35 mounting rails, commonly found in electrical enclosures and control panels. Simply snap the module onto the rail. Ensure proper wiring of power, ground, and the RS485 communication lines with correct polarity.