SONBUS SD2171B RS485 Interface Carbon Dioxide/Temperature/Humidity Integrated Sensor User Manual
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SONBUS SD2171B features RS485 interface and utilizes MODBUS-RTU protocol, making it compatible with PLC, DCS, and other instruments. It provides accurate monitoring of carbon dioxide levels, temperature, and humidity. The device boasts high precision sensing technology, ensuring reliable and stable measurements. It offers customization options for various output methods, including RS232, RS485, CAN, 4-20mA, and wireless connectivity options like Zigbee, Lora, Wi-Fi, and GPRS.
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SD2171B Us er Ma nual http://www.sonbus.com/
SD2171B
RS485 interface carbon dioxide, temperature, humidity integrated sensor
User Manual
File Version: V21.2.25
SD2171B using the standard RS485 bus MODBUS-RTU protocol,easy access to PLC , DCS and other instruments or systems for monitoring carbon dioxide,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
Technical parameter Parameter value
CO2 range
CO2 accuracy
Temperature measuring range
Temperature measuring accuracy
Humidity measuring range
Humidity accuracy
Communication Interface
Default baud rate
Power
0~5000ppm
± 100ppm
-30 ℃ ~80 ℃
± 0.5
℃ @25 ℃
0~100%RH
± 3%RH @25 ℃
RS485
9600 8 n 1
DC9~24V 1A
Display
Running temperature
LCD
-40~80° C
Working humidity 5%RH~90%RH
Wiring instructions
Any incorrect wiring can cause irreversible damage to the product. Please carefully wire the cable as follows in the case of power failure, and then connect the cable to confirm the correctness and then use it again.
ID
1
Core color
Red
Identification
V+
Note
Power +
2
3
Green
Yellow
V-
A+
Power -
RS485 A+
4 Blue B- RS485 B-
In the case of broken wires, wire the wires as shown in the figure. If the product itself has no leads, the core color is for reference.
Communication Protocol
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40001
40002
40003
40101
40102
40103
40104
40105
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 is shipped, the default baud rate is
9600, 8, n, 1
1. Read Data (Function id 0x03)
Inquiry frame (hexadecimal), sending example: Query 1# device 1 data, the host computer sends the command:01 03 00 00 00 03 05 CB .
Device ID Function id Start Address Data Length CRC16
01 03 00 00 00 03 05 CB
For the correct query frame, the device will respond with data:01 03 06 00 79 00 7A 00 7B DD 45 , the response format is parsed as follows:
Device ID
01
Function id Data Length data 1
03 06 00 79 data 2
00 7A data 3
00 7B
Check Code
DD 45
Data Description: The data in the command is hexadecimal. Take data 1 as an example. 00 79 is converted to a decimal value of 121. If the data magnification is 100, the actual value is 121/100=1.21.
Others and so on.
2. Data Address Table
Address Start Address Description Data type Value range
00 01
00 02
00 03
00 64
00 65
00 66
00 67
00 68 carbon dioxide temperature humidity model code total points
Device ID baud rate mode read read read read/write read/write read/write read/write read/write
0~65535
0~65535
0~65535
0~65535
1~20
1~249
0~6
1~4
40106 00 69 protocol
3 read and modify device address
(1) Read or query device address
read/write 1~10
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
FA
Function id
03
Start Address
00 64
Data Length
00 02
CRC16
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
01
Function id
03
Start Address
02
Model Code
55 3C 00 01
CRC16
3A 79
Response should be in the data, the first byte 01 indicates that the real address of the current device is,
55 3C converted to decimal 20182 indicates that the current device main model is 21820, the last two bytes
00 01 Indicates that the device has a status quantity.
(2)Change device address
For example, if the current device address is 1, we want to change to 02, the command is:01 06 00 66
00 02 E8 14 .
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Device ID
01
Function id
06
Start Address
00 66
Destination
00 02
CRC16
E8 14
After the change is successful, the device will return information: 02 06 00 66 00 02 E8 27 , its format is parsed as shown in the following table:
Device ID
01
Function id
06
Start Address
00 66
Destination
00 02
CRC16
E8 27
Response should be in the data, after the modification is successful, the first byte is the new device address. After the general device address is changed, it will take effect immediately. At this time, the user needs to change the query command of the software at the same time.
4 Read and Modify Baud Rate
(1) Read baud rate
The device 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 the curre nt device's baud rate ID, the command is:01 03 00 67 00 01 35 D5 , its format is parsed as follows.
Device ID
01
Function id
03
Start Address
00 67
Data Length
00 01
CRC16
35 D5
Read the baud rate encoding of the current device. Baud rate encoding: 1 is 2 400; 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
coded according to baud rate, 03 is 9600, ie the current device has a baud rate of 9600.
(2)Change the baud rate
For example, changing the baud rate from 9600 to 38400, ie changing the code fro m 3 to 5, the command is: 01 06 00 67 00 05 F8 1601 03 00 66 00 01 64 15 .
Device ID Function id Start Address Target Baud Rate CRC16
01 03 00 66 00 01 64 15
Change the baud rate from 9600 to 38400, changing the code from 3 to 5. The new baud rate will tak e effect immediately, at which point the device will lose its response and the baud rate of the device should be queried accordingly. Modified.
5 Read Correction Value
(1) Read Correction Value
When there is an error between the data and the r eference standard, we can reduce the display error by adjusting the correction value. The correction difference can be modified to be plus or minus 1000, that is, 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 of
FF 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
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For the correct query command, the device will respond, for example the response data is: 01 03 02
00 64 B9 AF, the format of which is as shown in the following table:
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, humidity have this parameter, the light generally does not have this item.
(2)Change correction value
For example, the current state quantity is too small, we want to add 1 to its true value, and the current value plus 100 correction operation command is:01 06 00 6B 00 64 F9 FD .
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 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 o f 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 a ny time without notice.
Contact Us
Company: Shanghai Sonbest Industrial Co., Ltd
Address:Building 8,No.215 North east road,Baoshan District,Shanghai,China
Web: http://www.sonbest.com
Web: http://www.sonbus.com
SKYPE: soobuu
Email: [email protected]
Tel: 86-021-51083595 / 66862055 / 66862075 / 66861077
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