Sonbus Kd97b70 Rs485 Explosion Proof Carbon Dioxide Sensor User Manual (+ PDF)

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Contents hide

1 SONBUS KD97B70 RS485 Explosion Proof Carbon Dioxide Sensor

2 Technical Parameters

3 Product Size

4 How to wiring

5 Application solution

6 How to use

7 Read and Modify Baud Rate

8 Read Correction Value

9 Change correction value

10 Documents / Resources

10.1 References

11 Related Posts

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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