QUNBAO QM7903V Noise Sensor Module User Manual
This user manual provides technical parameters and usage instructions for the QUNBAO QM7903V Noise Sensor Module, available in RS485, TTL and DC0-3V output methods. The device uses RS485 MODBUS-RTU standard protocol format and has a noise range of 30~130dB. Users can read and modify device address, baud rate, mode and protocol using hexadecimal data commands.