Technical Parameters
| Technical parameter | Parameter value |
| Brand | XUNCHIP |
| Accuracy | ±5%（@25℃ |
| Resolution | 0.1mm |
| Maximu rainfall | 14.5mm |
| Sensing diameter | φ60mm |
| Working pressure | Standard atmospheric pressure±10% |
| Communication Interface | RS485 |
| Default baud rate | 9600 8 n 1 |
| Power | DC9~24V 1A |
| Running temperature | -30~80℃ |
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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 01 84 0A .
| Address | Function code | Starting address | Data length | Checksum |
| 01 | 03 | 00 00 | 00 01 | 84 0A |
For a correct inquiry frame, the device will respond with data: 01 03 02 02 18 B9 2E , and the response format is:
| Address | Function code | Length | Data 1 | Checksum |
| 01 | 03 | 02 | 02 18 | B9 2E |
Data description: The data in the command is in hexadecimal. Taking Data 1 as an example, 02 18 converted to decimal value is 536, then the switch quantity count is 536, and the switch quantity count * 0.1mm = rainfall amount.
2. Common Data Address Table
| Configuration Address | Register Address | Register Description | Data Type | Value Range |
| 40001 | 00 00 | rainfall | 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 | 40107 | 00 6A | Time Interval |
| Read/Write | 1~36000 | Default 60 seconds | 40108 | 00 6B |
| Sensitivity | Read/Write | 0 - 100 Sensitivity adjustment | 40109 | 00 6C |
| Water immersion threshold | Read/Write | 100 - 3000 Water immersion threshold adjustment | 40110 | 00 6D |
| Instantaneous value in 1 hour | Read/Write | Clear when writing 0 | 40111 | 00 6E |
| Instantaneous value in 12 hours | Read/Write | Clear when writing 0 | 40112 | 00 6F |
| Cumulative value | Read/Write | Clear when writing 0 |