SONBUS SM3810B RS485 Interface Duct Type Temperature and Humidity Sensor User Manual

June 5, 2024
SONBUS

SONBUS SM1210B-12 RS485 Bus 12 Channel SHT10 Temperature and Humidity

Sensor

SM1210B-12 using the standard RS485 bus MODBUS-RTU protocol,easy access to PLC,DCS and other instruments or systems for monitoring temperature,humidity@12 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
Brand SONBEST
Temperature measuring range -30℃~80℃
Temperature measuring accuracy ±0.5℃ @25℃
Support sensor SHT10
Channels 12
Input bus IIC
Humidity measuring range 0~100%RH
Humidity measuring accuracy ±4.5%RH @25℃
Communication Interface RS485
Default baud rate 9600 8 n 1
Power DC9~24V 1A
Running temperature -40~80°C

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 is shipped, the default baud rate is 9600, 8, n, 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 0C 45 CF .

Device ID Function id Start Address Data Length CRC16
01 03 00 00 00 0C 45 CF

For the correct query frame, the device will respond with data:01 03 18 00 79 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 A5 E8 , the response format is parsed as follows:

Device

ID

| Function

id

| Data

Length

| 数

据 1

| 数

据 2

| 数

据 3

| 数

据 4

| 数

据 5

| 数

据 6

| | | | | | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---
01| 03| 18| 00

79

| 00

7A

| 00

7B

| 00

7C

| 00

7D

| 00

7E

| | | | | | |

Address Start Address Description Data type Value range
40001 00 00 1#temperatureregister Read only 0~65535
40002 00 01 2#humidityregister Read only 0~65535
40003 00 02 3#temperatureregister Read only 0~65535
40004 00 03 4#humidityregister Read only 0~65535
40005 00 04 5#temperatureregister Read only 0~65535
40006 00 05 6#humidityregister Read only 0~65535
40023 00 16 23#temperatureregister Read only 0~65535
--- --- --- --- ---
40024 00 17 24#humidityregister Read only 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

Data Address Table

Device ID Function id Start Address Data Length CRC16
FA 03 00 64 00 02 90 5F

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 use the command FA 03 00 64 00 02 90 5F Query device address.

Device ID Function id Start Address Model Code CRC16
01 03 02 55 3C 00 01 3A 79

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 Destination CRC16
01 06 00 66 00 02 E8 14

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.

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

Device ID Function id Start Address Destination CRC16
01 06 00 66 00 02 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.

Device ID Function id Start Address Data Length CRC16
01 03 00 67 00 01 35 D5

Read and Modify Baud Rate

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 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 Data Length Rate ID CRC16
01 03 02 00 03 F8 45

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 Start Address Target Baud Rate CRC16
01 03 00 66 00 01 64 15

For example, changing the baud rate from 9600 to 38400, ie changing the code from 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 Data Length CRC16
01 03 00 6B 00 01 F5 D6

Change the baud rate from 9600 to 38400, changing the code from 3 to 5. The new baud rate will take effect immediately, at which point the device will lose its response and the baud rate of the device should be queried accordingly. Modified.

Device ID Function id Data Length Data value CRC16
01 03 02 00 64 B9 AF

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 Destination CRC16
01 06 00 6B 00 64 F9 FD

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