Sonbest Sm7320b Rs485 Rack Temperature And Humidity Sensor User Manual

SM7320B RS485 Rack Temperature and Humidity Sensor

Product Information: SM7320B RS485 Rack Temperature and
Humidity Sensor

The SM7320B is a temperature and humidity sensor that uses the
standard RS485 bus MODBUS-RTU protocol for easy access to PLCDCS
and other instruments or systems for monitoring temperature and
humidity state quantities. The sensor has a high-precision sensing
core and related devices that ensure high reliability and excellent
long-term stability. The SM7320B can be customized with various
output methods, including RS232, RS485, CAN, 4-20mA, DC0~5V10V,
ZIGBEE, Lora, WIFI, GPRS, and others.

Technical Parameters:

Product Usage Instructions:

To use the SM7320B RS485 Rack Temperature and Humidity Sensor,
follow these steps:

1. Connect the sensor to a PLCDCS or other monitoring system using
   the RS485 bus MODBUS-RTU protocol.
2. If necessary, customize the output method using one of the
   available options, such as RS232, RS485, CAN, 4-20mA, DC0~5V10V,
   ZIGBEE, Lora, WIFI, or GPRS.
3. Ensure that the sensor is placed in an appropriate location to
   measure temperature and humidity accurately. The user manual does
   not provide information on the temperature or humidity measuring
   ranges or accuracies, so consult with a product expert if
   necessary.
4. The sensor does not provide information on power, actual power
   consumption, running temperature, or working humidity, so these
   parameters cannot be adjusted or monitored.

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SM7320B RS485 rack temperature and humidity sensor
User Manual
File Version: V22.4.18

SM7320B using the standard RS485 bus MODBUS-RTU protocol,easy access to PLCDCS and

other instruments or systems for monitoring temperature,humidity state quantities.The internal use of

high-precision sensing core and related devices to ensure high r eliability and excellent long-term

stability,can be customized RS232,RS485,CAN,4-20mA,DC0~5V10V,ZIGBEE,Lora,WIFI,GPRS and

other output methods.

Technical Parameters

Technical parameter

Parameter value

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Brand Temperature measuring range Temperature measuring accuracy Humidity measuring range Humidity accuracy Communication Interface Default baud rate Power Actual power consumption Running temperature Working humidity

SONBEST -30~80 ±0.5 @25 0~100%RH ±3%RH @25 RS485 9600 8 n 1 DC9~24V 1A <20mA @9V -40~80°C 5%RH~90%RH

Product Size

How to wiring?

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Application solution
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How to use?

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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 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 01 84 0A .

Address

Function Code

Start Address

Data Length

Check Code

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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 , response format:

Address

Function Code

Length

Data 1

Check Code

01

03

02

00 79

79 A6

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

Register Address Register

Data Type

Value Range

Address

Description

40001

00 00

temperature

Read Only

0~65535

40101

00 64

Model Code

Read/Write

0~65535

40102

00 65

total number of

read/write

1~20

measuring points

40103

00 66

device address

read/write

1~249

40104

00 67

baud rate

read/write

0~6

40105

00 68

communication

read/write

1~4

mode

40106

00 69

protocol type

read/write

1~10

3 Read and modify device address (1) 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 .

Device Address

Function Code

Start Address

Data Length

Check Code

FA

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:

Device Address

Function Code

Start Address

Model Code

Check Code

01

03

02

00 01

79 84

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

(2) 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 .

Device Address

Function Code

Register Address Target Address

Check Code

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:

Device Address

Function Code

Register Address Target Address

Check Code

02

06

00 66

00 02

E8 27

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 needs

to change the query command of his software accordingly. .

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4 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 exampl e, 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.

Device Address

Function Code

Start Address

Data Length

Check Code

01

03

00 67

00 01

35 D5

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:

Device Address

Function Code

Data Length

Baud Rate Code Check Code

01

03

02

00 03

F8 45

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

(2) 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 .

Device Address

Function Code

Register Address Target Baud Rate Check Code

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.

5 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 error

by 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.

Device Address

Function Code

Start Address

Data Length

Check Code

01

03

00 6B

00 01

F5 D6

For the correct query command, the device will respond, for example, the res ponse data is: 01 03 02

00 64 B9 AF, and its format parsing is shown in the following table:

Device Address

Function Code

Data Length

Correction Value Check Code

01

03

02

00 64

B9 AF

In the response data, the first byte 01 represents the real addr ess 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.

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(2) 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 .

Device Address

Function Code

Register Address Target Address

Check Code

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 marketabi lity 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

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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References

• Home-上海搜博实业有限公司
• Home-SONBEST -SONBUS.COM| THE SENSOR COMPANY
• Home-SONBEST -SONBUS.COM| THE SENSOR COMPANY