The SUNSTAR BMD-03-OEM sensor manual provides specifications, installation, wiring, Modbus commands and safety guidelines.
The BMD-03-OEM is a digital temperature‑humidity sensor with 14‑bit resolution, internal self‑calibration and RS‑485 Modbus communication. It is designed for industrial monitoring and can be mounted horizontally, vertically or at an angle.
The manual details the sensor’s physical dimensions, technical parameters, terminal connections, installation steps, safety precautions, hazardous‑substance declaration and the Modbus protocol used for reading temperature and humidity or setting the device address. This manual is written in Chinese.
| Communication Interface | RS-485 |
|---|---|
| Protocol | ModBus |
| Baud Rate | 9600 |
| Address Range | 1‑255 (software set) |
| Maximum Transmission Distance | 1200 m |
| Maximum Devices on Bus | 32 |
| Enclosure Material | Flame‑retardant engineering plastic UL94‑V0 |
| Supply Voltage | 5 V ± 0.5 V |
| Supply Current | ≤ 15 mA |
| Temperature Measurement Range | -20 °C to 70 °C |
| Humidity Measurement Range | 0 % to 100 % RH |
Connect Vcc to the power supply, GND to ground, Shield to the shield line, 485+ to the RS‑485 positive line, and 485‑ to the RS‑485 negative line.
The sensor measures temperatures from –20 °C to 70 °C.
The sensor supports a transmission distance of up to 1200 m on the RS‑485 bus.