Technical Parameters
| Technical parameter | Parameter value |
| Brand | SONBEST |
| CO2 range | 0~2000ppm |
| CO2 accuracy | ±50ppm |
| PM2.5 range | 0~999ug/m3 |
| PM2.5 accuracy | ±15% or ±10ug/m3 max @25℃ |
| PM10 range | 0~999ug/m3 |
| PM10 accuracy | ±15% or ±35ug/m3 max @25℃ |
| Communication Interface | RS485 |
| Default baud rate | 9600 8 n 1 |
| Power | DC5V 1A |
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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 04 44 09 .
| Address | Function code | Starting address | Data length | Checksum |
| 01 | 03 | 00 00 | 00 04 | 44 09 |
For a correct inquiry frame, the device will respond with data: 01 03 08 02 1B 00 00 00 00 00 00 BF F , and the response format is:
| Address | Function code | Length | Data 1 | Data 2 | Data 3 | Data 4 | Checksum |
| 01 | 03 | 08 | 02 18 | 02 19 | 02 1A | 02 1B | BF F |
Data description: The data in the command is in hexadecimal. Taking Data 1 as an example, 02 18 converted to decimal value is 536, the data magnification factor is 1, then the true value is 536/1 = 536, and the others can be deduced by analogy.
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 | PM1.0 | Read Only | 0~65535 |
| 40003 | 00 02 | PM2.5 | Read Only | 0~65535 |
| 40004 | 00 03 | PM10 | 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 |
software for test product
After downloading, please read the readme.txt documentation
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