Technical Parameters
| Technical parameter | Parameter value |
| Brand | SONBEST |
| Channels | 4 |
| Input | RS485 |
| Moisture measuring range | 0~100% |
| Moisture measuring accuracy | ±3% @25℃ |
| Moisture Temperature range | -30℃~80℃ |
| Moisture Temperature accuracy | ±0.5℃ @25℃ |
| Communication Interface | RS485 |
| Power | DC5~24V 1A |
| Display | 1.8 TFT |
| Storage | 8M |
| Max Records | 65000 |
| 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 02 C4 0B .
| Address | Function Code | Start Address | Data Length | Check Code |
| 01 | 03 | 00 00 | 00 02 | C4 0B |
For the correct query frame, the device will respond with data: 01 03 04 00 79 00 00 2B EA , response format:
| Address | Function Code | Length | Data 1 | Data 2 | Data 3 |
| Data 4 | Data 5 | Data 6 | Data ... | Data 7 | Data 8 |
| Check Code | 01 | 03 | 04 | 00 79 | 00 7A |
| 00 7B | 00 7C | 00 7D | 00 7E | ...... | ......00 79 |
| 00 79 | 2B EA |
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 |
| 40001 | 00 00 | 1#soil Moisture register | Read Only | 0~65535 |
| 40002 | 00 01 | 2#soil temperature register | Read Only | 0~65535 |
| 40003 | 00 02 | 3#soil Moisture register | Read Only | 0~65535 |
| 40004 | 00 03 | 4#soil temperature register | Read Only | 0~65535 |
| 40005 | 00 04 | 5#soil Moisture register | Read Only | 0~65535 |
| 40006 | 00 05 | 6#soil temperature register | Read Only | 0~65535 |
| ... | ... | ... | ... | ... |
| 40007 | 00 06 | 7#soil Moisture register | Read Only | 0~65535 |
| 40008 | 00 07 | 8#soil temperature register | 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 |