SONBEST XM2190B-PM25 RS485 bus MODBUS-RTU Protocol Instruments OR Systems For Monitoring User Manual

SONBEST XM2190B-PM25 RS485 bus MODBUS-RTU Protocol Instruments OR Systems

For Monitoring

XM2190B-PM25 using the standard RS485 bus MODBUS-RTU protocol,easy access to PLC，DCS and other instruments or systems for monitoring PM2.5,PM10,temperature,humidity state quantities.The internal use of high- precision sensing core and related devices to ensure high reliability and excellent long-term stability,can be customized
RS232,RS485,CAN,4-20mA,DC0~5V\10V,ZIGBEE,Lora,WIFI,GPRS and other output methods.

Technical Parameters

Product Size

Application solution

How to use?

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 default baud rate is 9600,8,n,1 .

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 04 44 09 .

For the correct query frame, the device will respond with data: 01 03 08 00 7C 00 00 00 00 00 00 28 10 , response format

Address| Function

Code

| Length| Data 1| Data 2| Data 3| Data 4| Check

Code

---|---|---|---|---|---|---|---
01| 03| 08| 00 79| 00 7A| 00 7B| 00 7C| 28 10

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.

Common data address table

Configuration

Address

| Register Address| Register

Description

| Data Type| Value Range
---|---|---|---|---
40001| 00 00| PM2.5| Read Only| 0~65535
40002| 00 01| PM10| Read Only| 0~65535
40003| 00 02| temperature| Read Only| 0~65535
40004| 00 03| humidity| 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

Read and modify device address

Read or query device address

If you don’t know the current device address and there is only one device on the bus, you can query the device address through the commandFA 03 00 66 00 01 71 9E .

FA means 250 is the general address, when you don’t know the address, you can use 250 to get the real device address, 00 66 is the device address register.
For the correct query command, the device will respond, for example, the response data is: 01 03 02 00 01 79 84, and its format parsing is shown in the following table:

In the response data, the first byte 01 represents the real address of the current device.

Change device address

For example, if the current device address is 1 and we want to change it to 02, the command is: 01 06 00 66 00 02 E8 14 .
After the change is successful, the device will return the information: 02 06 00 66 00 02 E8 27 , and its format analysis is shown in the following table:

In the response data, after the modification is successful, the first byte is the new device address.
Generally, after the device address is changed, it will take effect immediately. At this time, the user nee ds to change the query command of his software accordingly. .

Read and modify baud rate (1) Read baud rate

The default factory baud rate of the device is 9600. If you need to change it, you can change it
according to the following table and the corresponding communication protocol. For example, to read the baud rate ID of the current device, the command is: 01 03 00 67 00 01 35 D5 , the format is parsed as follows.

Read the baud rate code of the current device. Baud rate code: 1 is 2400; 2 is 4800; 3 is 9600; 4 is 19200; 5 is 38400; 6 is 115200.
For the correct query command, the device will respond, for example, the response data is: 01 03 02 00 03 F8 45, and its format analysis is shown in the following table:

According to the baud rate code, 03 is 9600, that is, the baud rate of the current device is 9600.
Change the baud rate

For example, change the baud rate from 9600 to 38400, that is, change the code from 3 to 5, the command is: 01 06 00 67 00 05 F8 16 .

Change the baud rate from 9600 to 38400, that is, change the code from 3 to 5. The new baud rate will take effect immediately, and the device will lose response at this time, and the baud rate of the device needs to be checked accordingly Modified.

Read and modify correction value

(1) Read correction value
When there is an error between the data and the reference standard, we can reduce the display errorby adjusting the correction value. The correction difference can be modified in a range of plus or minus 1000, that is, the value range is 0-1000 or 64535 -65535. For example, when the displayed value is too small by 100, we can correct it by adding 100. The command is: 01 03 00 6B 00 01 F5 D6 . In the command, 100 is hexadecimal 0x64 ;If you need to reduce it, you can set a negative value, such as -100, the corresponding hexadecimal value is FF 9C, the calculation method is 100-65535=65435, and then converted to hexadecimal, it is 0x FF 9C. Device The correction value starts from 00 6B. We take the first parameter as an example to illustrate. When there are multiple parameters, the correction value is read and modified in the same way.

For the correct query command, the device will respond, for example, the response data is: 01 03 02 00 64 B9 AF, and its format parsing is shown in the following table:

In the response data, the first byte 01 represents the real address of the current device, and 00 6B is the first state correction value register. If the device has multiple parameters, other parameters operate in the same way as this The same, generally temperature and humidity have this parameter, and lighting generally does not have this parameter.

Change the correction value
For example, if the current state is too small, we want to add 1 to its real value, and add 100 to the current value. The correction operation command is: 01 06 00 6B 00 64 F9 FD .

After the operation is successful, the device will return the information: 01 06 00 6B 00 64 F9 FD , after the successful change, the parameters will take effect immediately.

Disclaimer

This document provides all information about the product, does not grant any license to intellectual property, does not express or imply, and prohibits any other means of granting any intellectual property rights, such as the statement of sales terms and conditions of this product, other issues. No liability is assumed. Furthermore, our company makes no warranties, express or implied, regarding the sale and use of this product, including the suitability for the specific use of the product, the marketability or the infringement liability for any patent, copyright or other intellectual property rights, etc. Product specifications and product descriptions may be modified at any time without notice.

Contact Us

Brand: XUNCHIP
Address: Room 208, Building 8, No. 215, Nandong Road, Baoshan District, Shanghai, Xinxin Brand Business Department
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Tel: 86-021-51083595 / 66862055 / 66862075 / 66861077

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