Product

Technical Parameters

Technical parameter	Parameter value
Brand	SONBEST
Temperature measuring range	-30℃~80℃
Temperature measuring accuracy	±0.5℃ @25℃
Support sensor	SHT30
Channels	12
Input bus	IIC
Communication Interface	RS485
Default baud rate	9600 8 n 1
Power	DC6~24V 1A
Storage	128M
Max Records	250000
Running temperature	-30~85℃

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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 module or NON-Recorder default baud rate is 9600,8,n,1 ,but data recorder default baud rate is 115200 .
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 0C 45 CF .

Address	Function Code	Start Address	Data Length	Check Code
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 , response format:

Address

Function Code

Length

Data 1

Data 2

Data 3

Data 4

Data 5

Data 6

Data ...

Data 23

Data 24

Check Code

01

03

18

00 79

00 7A

00 7B

00 7C

00 7D

00 7E

......

......00 79

00 79

A5 E8

    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 Address	Register Address	Register Description	Data Type	Value Range
40001	00 00	1#temperature register	Read Only	0~65535
40002	00 01	2#humidity register	Read Only	0~65535
40003	00 02	3#temperature register	Read Only	0~65535
40004	00 03	4#humidity register	Read Only	0~65535
40005	00 04	5#temperature register	Read Only	0~65535
40006	00 05	6#humidity register	Read Only	0~65535
...	...	...	...	...
40023	00 16	23#temperature register	Read Only	0~65535
40024	00 17	24#humidity register	Read Only	0~65535
40101	00 64	Model Code	Read/Write	0~65535
40102	00 65	total number of measuring points	read/write	1~20
40103	00 66	device address	read/write	1~249
40104	00 67	baud rate	read/write	0~6
40105	00 68	communication mode	read/write	1~4
40106	00 69	protocol type	read/write	1~10