[KM35B91]  Illumination temperature and humidity sensor

KM35B91 KM35B91

Technical Parameters

Technical parameterParameter value
BrandKLHA
Illuminance measuring range0~20 0000Lux
Illuminance allow deviation±7%
Repeatability test±5%
Illuminance detection chipImport digital
Wavelength range380nm~730nm
Temperature measuring range-30℃~80℃
Temperature measuring accuracy±0.5℃ @25℃
Humidity measuring range0~100%RH
Humidity accuracy±3%RH @25℃
Communication InterfaceRS485
Default baud rate9600 8 n 1
PowerDC6~24V 1A
Running temperature-30~85℃
Working humidity5%RH~90%RH

Product Size

KM35B91

Wiring instructions

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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 03 05 CB .
Address Function Code Start Address Data Length Check Code
010300 0000 0305 CB
    For the correct query frame, the device will respond with data: 01 03 06 00 7B 00 00 00 00 C5 7F , response format:
Address Function Code LengthData 1Data 2Data 3Check Code
0103 0600 7900 7A00 7B C5 7F
    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.
    For illuminance, since each parameter occupies 2 bytes and the actual resolution of illuminance in the 200,000 range is lower than 10, we use 20,000 or 20,000 to express 200,000, that is The magnification is 10. For example, when the read data is 839, the actual illuminance value is 8390LUX.
2. Common data address table
Configuration Address Register Address Register Description Data Type Value Range
4000100 00IlluminanceRead Only0~65535
4000200 01temperatureRead Only0~65535
4000300 02humidityRead 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

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