Technical Parameters
Technical parameter | Parameter value |
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 | DC9~24V 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.
2. Common data address table
Configuration Address | Register Address | Register Description | Data Type | Value Range |
40001 | 00 00 | PM1.0 | Read Only | 0~65535 |
40002 | 00 01 | PM2.5 | Read Only | 0~65535 |
40003 | 00 02 | PM10 | 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 |