Product

Technical Parameters

Technical parameter	Parameter value
Brand	KLHA
Temperature measuring range	-30℃~85℃
Temperature measuring accuracy	±0.5℃ @25℃
Humidity measuring range	0~100%RH
Humidity accuracy	±3%RH @25℃
Illuminance measuring range	0~20 0000Lux
Illuminance allow deviation	±7%
Repeatability test	±5%
Illuminance detection chip	Import digital
Wavelength range	380nm~730nm
Communication Interface	RS485
Default baud rate	9600 8 n 1
Power	DC6~24V 1A
Running temperature	-30~85℃
Working humidity	5%RH~90%RH

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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
01	03	00 00	00 03	05 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	Length	Data 1	Data 2	Data 3	Check Code
01	03	06	00 79	00 7A	00 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
40001	00 00	temperature	Read Only	0~65535
40002	00 01	humidity	Read Only	0~65535
40003	00 02	Illuminance	Read Only	0~65535
40101	00 64	Model Code	Read/Write	0~65535
40102	00 65	total number of measuring points	read/write	1~20
40103	00 66	device address	read/write	1~249
40104	00 67	baud rate	read/write	0~6
40105	00 68	communication mode	read/write	1~4
40106	00 69	protocol type	read/write	1~10