Product

Technical Parameters

Technical parameter	Parameter value
Brand	SONBEST
CO2 range	0~5000ppm
CO2 accuracy	±100ppm
Temperature measuring range	-30℃~80℃
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
Moisture measuring range	0~100%
Moisture measuring accuracy	±3% @25℃
Communication Interface	RS485
Default baud rate	9600 8 n 1
Power	DC9~24V 1A
Running temperature	-30~80℃
Working humidity	5%RH~90%RH

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Communication Protocol

    The product uses the RS485 MODBUS-RTU standard protocol format, and all operation or reply commands are in hexadecimal data. When the device leaves the factory, the default device address is 1, and the default baud rate is: for modules and non-recording instruments: 9600, 8, n, 1 (for the recorder series products, the default is: 115200, 8, n, 1).
1. Read data (Function code 0x03)
    The inquiry frame (in hexadecimal). Example of sending: To query 1 piece of data of device No. 1, the host computer sends the command: 01 03 00 00 00 05 85 C9 .

Address	Function code	Starting address	Data length	Checksum
01	03	00 00	00 05	85 C9

    For a correct inquiry frame, the device will respond with data: 01 03 0A 02 1C 00 00 00 00 00 00 00 00 1D BC , and the response format is:

Address	Function code	Length	Data 1	Data 2	Data 3	Data 4	Data 5	Checksum
01	03	0A	02 18	02 19	02 1A	02 1B	02 1C	1D BC

    Data description: The data in the command is in hexadecimal. Taking Data 1 as an example, 02 18 converted to decimal value is 536. Assuming the data magnification factor is 100, then the true value is 536/100 = 5.36, and the others can be deduced by analogy.
    For illuminance, since each parameter occupies 2 bytes and the actual resolution of the illuminance with a 200,000-range is lower than 10, we use 20000, that is, 20,000, to represent 200,000, that is, the magnification factor 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	carbon dioxide	Read Only	0~65535
40002	00 01	temperature	Read Only	0~65535
40003	00 02	humidity	Read Only	0~65535
40004	00 03	Illuminance	Read Only	0~65535
40005	00 04	soil Moisture	Read Only	0~65535
40101	00 64	Model Code	Read-only	0~59999
40102	00 65	Total Number of Measuring Points	Read-only	1~1600
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 Query
2 Active Upload	40106	00 69	Protocol Type	Read/Write
1 MODBUS-RTU	Others Unused