SONBUS KD97B70 RS485 Explosion Proof Carbon Dioxide Sensor User Manual
- June 5, 2024
- SONBUS
Table of Contents
SONBUS KD97B70 RS485 Explosion Proof Carbon Dioxide Sensor
Technical Parameters
| Technical parameter | Parameter value |
|---|---|
| CO2 range | 0~5000ppm |
| CO2 accuracy | ±100ppm |
| Communication Interface | RS485 |
| Default baud rate | 9600 8 n 1 |
| Power | DC9~24V 1A |
| Display | LCD |
| Running temperature | -40~80°C |
| Working humidity | 5%RH~90%RH |
Product Size
How to wiring
Application solution
How to use
Read Data
| Device ID | Function id | Start Address | Data Length | CRC16 |
|---|---|---|---|---|
| 01 | 03 | 00 00 | 00 01 | 84 0A |
For the correct query frame, the device will respond with data:01 03 02 00 79 79 A6 , the response format is parsed as follows
| Device ID | Function id | Data Length | data 1 | Check Code |
|---|---|---|---|---|
| 01 | 03 | 02 | 00 79 | 79 A6 |
Data Address Table
| Address | Start Address | Description | Data type | Value range |
|---|---|---|---|---|
| 40001 | 00 01 | carbon dioxide | read | 0~65535 |
| 40101 | 00 64 | model code | read/write | 0~65535 |
| 40102 | 00 65 | total points | read/write | 1~20 |
| 40103 | 00 66 | Device ID | read/write | 1~249 |
| 40104 | 00 67 | baud rate | read/write | 0~6 |
| 40105 | 00 68 | mode | read/write | 1~4 |
| 40106 | 00 69 | protocol | read/write | 1~10 |
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 use the command FA 03 00 64 00 02 90 5F Query device address
| Device ID | Function id | Start Address | Data Length | CRC16 |
|---|---|---|---|---|
| FA | 03 | 00 64 | 00 02 | 90 5F |
FA is 250 for the general address. When you don’t know the address, you can use 250 to get the real device address, 00 64 is the device model register. For the correct query command, the device will respond, for example the response data is: 01 03 02 07 12 3A 79, the format of which is as shown in the following table
| Device ID | Function id | Start Address | Model Code | CRC16 |
|---|---|---|---|---|
| 01 | 03 | 02 | 55 3C 00 01 | 3A 79 |
Change devise address
| Device ID | Function id | Start Address | Destination | CRC16 |
|---|---|---|---|---|
| 01 | 06 | 00 66 | 00 02 | E8 14 |
| Device ID | Function id | Start Address | Destination | CRC16 |
| --- | --- | --- | --- | --- |
| 01 | 06 | 00 66 | 00 02 | E8 27 |
Read and Modify Baud Rate
The device’s default factory baud rate is 9600. If you need to change it, you can change it according to the following table and the corresponding communication protocol. For example, read th e current device’s baud rate ID, the command is:01 03 00 67 00 01 35 D5 , its format is parsed as follows.
| Device ID | Function id | Start Address | Data Length | CRC16 |
|---|---|---|---|---|
| 01 | 03 | 00 67 | 00 01 | 35 D5 |
Read the baud rate encoding of the current device. Baud rate encoding: 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, the format of which is as shown in the following table
| Device ID | Function id | Data Length | Rate ID | CRC16 |
|---|---|---|---|---|
| 01 | 03 | 02 | 00 03 | F8 45 |
Read Correction Value
When there is an error between the data and the reference standard, we can reduce the display error by adjusting the correction value. The correction difference can be modified to be plus or minus 1000, thatis, the value range is 0-1000 or 64535 -65535. For example, when the display value is too small, we can correct it by adding 100. The command is: 01 03 00 6B 00 01 F5 D6 . In the command 100 is hex 0x64 If you need to reduce, you can set a negative value, such as -100, corresponding to the hexadecimal value ofFF 9C, which is calculated as 100-65535=65435, and then converted to hexadecimal to 0x FF 9C. The correction value starts from 00 6B. We take the first parameter as an example. The correction value is read and modified in the same way for multiple parameters
| Device ID | Function id | Start Address | Data Length | CRC16 |
|---|---|---|---|---|
| 01 | 03 | 00 6B | 00 01 | F5 D6 |
| Device ID | Function id | Data Length | Data value | CRC16 |
| --- | --- | --- | --- | --- |
| 01 | 03 | 02 | 00 64 | B9 AF |
In the response data, the first byte 01 indicates the real address of the current device, and 00 6B is the first state quantity correction value register. If the device has multiple parameters, other parameters operate in this way. The same, the general temperature, and humidity have this parameter, the light generally does not have this item
Change correction value
| Device ID | Function id | Start Address | Destination | CRC16 |
|---|---|---|---|---|
| 01 | 06 | 00 6B | 00 64 | F9 FD |
After the operation is successful, the device will return information: 01 06
00 6B 00 64 F9 FD, the parameters take effect immediately after a successful
change.
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.
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