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Product

 [QM7903V]  Voltage Type On-Board Noise Sensor Module


QM7903V QM7903V

Technical Parameters

Technical parameterParameter value
BrandTRANBALL
Noise range30~130dB
Noise accuracy±3%
InterfaceRS485/TTL/DC0-3V
PowerDC5V 1A
Running temperature-30~85℃
Working humidity5%RH~90%RH

Product Selection

    Product DesignRS485,TTL,DC0-3VMultiple output methods, the products are divided into the following models depending on the output method.
Product model output method
QM7903BRS485总线
QM7903TTLTTL

Product Size

QM7903V

Why choose this product?

QM7903V QM7903V

How to use?

QM7903V

Pictures

QM7903V QM7903V

Communication Protocol

    The product uses RS485 MODBUS-RTU standard protocol format, all operation or reply commands are hexadecimal data. The default device address is 1 when the device leaves the factory, and the module or NON-Recorder default baud rate is 9600,8,n,1 ,but data recorder default baud rate is 115200 .
1. Read data (function code 0x03)
    Inquiry frame (hexadecimal), sending example: query 1 data of 1# device, the upper computer sends the command: 01 03 00 00 00 01 84 0A .
Address Function Code Start Address Data Length Check Code
010300 0000 0184 0A
    For the correct query frame, the device will respond with data: 01 03 02 00 79 79 A6 , response format:
Address Function Code LengthData 1Check Code
0103 0200 79 79 A6
    Data description: The data in the command is hexadecimal, take data 1 as an example, 00 79 is converted to decimal value as 121, assuming the data magnification is 100, then the real value is 121/100=1.21, Others and so on.
2. Common data address table
Configuration Address Register Address Register Description Data Type Value Range
4000100 00noiseRead Only0~65535
4010100 64Model CodeRead/Write0~65535
4010200 65 total number of measuring points read/write 1~20
4010300 66device addressread/write1~249
4010400 67baud rateread/write0~6
4010500 68communication moderead/write1~4
4010600 69protocol typeread/write1~10

  For example, the range is 30~130dB, the analog output is 0~3V DC0-3Vvoltage signal, noise and DC0-3Vvoltage The calculation relationship is as shown in the formula: C = (A2-A1) * (X-B1) / (B2-B1) + A1, where A2 is noise range upper limit, A1 is the lower limit of the range, B2 is DC0-3Vvoltage output range upper limit, B1 is the lower limit, X is the currently read noise value, and C is the calculated DC0-3Vvoltage value. The list of commonly used values is as follows:
DC0-3Vvoltage(V)noiseValue (dB) Calculation Process
030.0(130-30)*(0-0)÷(3-0)+30
163.3(130-30)*(1-0)÷(3-0)+30
296.7(130-30)*(2-0)÷(3-0)+30
3130.0(130-30)*(3-0)÷(3-0)+30
    As shown in the above formula, when measuring 1.5V, current DC0-3Vvoltage is 50dB。
software for test product
After downloading, please read the readme.txt documentation

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Data and Software
software for test product
Data and Software
software for test product
After downloading, please read the readme.txt documentation

0

Data and Software

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