Product

Product Overview

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    SD8603B Using Standards & RS485 Interfaces,based on industrial MODBUS-RTU protocol, easy access to PLCs, DCS and other instruments or systems for monitoring .it can monitoring 6 State amount.
     Internally used higher precision sensing cores and related devices to ensure high reliability and excellent long-term stability. The series selects RS232, RS485, CAN, 4-20mA, DC0-5V\10V, ZIGBEE, LORO, WIFI, GPRS and other output methods (special communication protocol can be customized).
     can be applied to a variety of locations for simultaneous monitoring of multiple points, especially for agricultural greenhouses, tunnels, weather, urban lighting, etc.

Product Pictures

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Wiring instructions

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    Please wire according to the following logo or lead color. Do not use live wiring, otherwise it will damage the equipment. Carefully check the wiring and turn it on again.

Core color	Identification	Note
RED	V+	Power RS485 positive electrode
GREEN	V-	Power RS485negative electrode
YELLOW	A+	RS485 A+
BLUE	B-	RS485 B-

Protocol

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    SD8603BAll operation or reply commands are hexadecimal data. Default communication baud rate:9600,8,n,1。
1 ) Read data (function code 0x03)
< Td>data length

Command description	Device address	Function code	Starting address	check code
Command format	01	03	00 00	00 06	C5 C8
Sending example	01 03 00 00 00 06 C5 C8

Response command format and examples

Response description	Device address	Function code	Data length	data 1	data 2	data 3	data 4	data 5	data 6	Check code
Command format	01	03	0C	00 79	00 7A	00 7B	00 7C	00 7D	00 7E	86 BA
Reply Command	01 03 0C 00 79 00 7A 00 7B 00 7C 00 7D 00 7E 86 BA
Data Format	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 in Configuration Software	Register address	Register Description	Data Type	Range of values
40001	00 01	SHT20温度register	unit	0-65535
40002	00 02	SHT20湿度register	unit	0-65535
40003	00 03	二氧化碳register	unit	0-65535
40004	00 04	土壤水分register	unit	0-65535
40005	00 05	土壤温度register	unit	0-65535
40006	00 06	辐照度register	unit	0-65535
40100	00 64	Model Code	Unsigned int	0-65535
40101	00 65	Total number of points	Unsigned int	1- 5000
40102	00 66	Device address	Unsigned int	1-249
40103	00 67	Baud rate	Unsigned int	0- 6
40104	00 68	Communication Mode	Unsigned int	0-2
40105	00 69	Protocol Type	Unsigned int	0-3
40106	00 6A	Upload time interval	Unsigned shaping	0- 36000
40107	00 6B	SHT20温度Correction value	unit	0-65535
40108	00 6C	SHT20湿度Correction value	unit	0-65535
40109	00 6D	二氧化碳Correction value	unit	0-65535
40110	00 6E	土壤水分Correction value	unit	0-65535
40111	00 6F	土壤温度Correction value	unit	0-65535
40112	00 70	辐照度Correction value	unit	0-65535

3 ) Read and modify device address
1. Read device address
if do not know device address and only have 1 device on rs485 bus,You can use this command to query the current Device address.

Command description	Device address	Function code	Start Address	Data length	Check code
Command format	FA	03	00 64	00 01	D0 5E
Sending example	FA 03 00 64 00 01 D0 5E
Command description	FA,250 For the general address, when you do not know the address, you can use the 250 address to get the real Device address, 00 64 is the device model register, here can also be 00 66 (Device address register）。

Response Command format and examples

Response description	Device address	Function code	Data length	Type ID	Check code
Response example	01	03	02	07 12	3A 79
Response example	01 03 02 07 12 3A 79
Response description	The first byte 01 indicates that the real address of the current device is 01, and the conversion from 07 12 to decimal is 1810, that is, the current device model is 1810.

2. Change device address

Command description	Device address	Function code	Register address	Current Address	Object address	Check code
Command format	01	06	00 66	00 01	00 02	E8 14E
Sending example	01 06 00 66 00 02 E8 14E
Command description	change device address 1 to 2.

Response Command format and examples

Response description	Device address	Function code	Register address	Object address	Check code
Response example	02	06	00 66	00 02	E8 27
Response example	02 06 00 66 00 02 E8 27
Response description	After the modification is successful, the first byte is the new Device address, which takes effect immediately.

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.

Command description	Device address	Function code	Start Address	Data length	Check code
Command format	01	03	00 67	00 01	35 D5
Sending example	01 03 00 67 00 01 35 D5
Command description	Read the baud rate code of the current device. Baud rate coding: 1 is 2400; 2 is 4800; 3 is 9600; 4 is 19200; 5 is 38400;

Response Command format and examples

Response description	Device address	Function code	Data length	baud rate ID	Check code
Response example	01	03	02	00 03	F8 45
Response example	01 03 02 00 03 F8 45
Response description	According to the baud rate coding, 03 is 9600, that is, the current device has a baud rate of 9600.

2. Modify baud rate

Command description	Device address	Function code	Start Address	object baud rate	Check code
Command format	01	06	00 67	00 05	F8 16
Sending example	01 06 00 67 00 05 F8 16
Command description	Change the baud rate from 9600 to 38400, which will change the code from 3 to 5. The new baud rate will take effect immediately, at which point the device will lose its response or the response will be incorrect.

4 ) Read and modify Correction value
1. Read Correction value
When the data is inaccurate with 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, that is, the value range is 0-1000 or 64535-65535. For example, when the display value is too small, 100We correct by adding 100. In the command, 100 is hexadecimal 0x64; if it needs to be reduced, you can set a negative value, such as -100, corresponding to the hexadecimal value of FF 9C, which is calculated as 100-65535=65435, then turn to ten The hexadecimal is 0x FF 9C.
Correction value is start from 00 6B,Let us take the first parameter as an example. When multiple parameters are used, the Correct value is read and modified in the same way.

Command description	Device address	Function code	Register address	Data length	Check code
Command format	01	03	00 6B	00 01	F5 D6
Sending example	01 03 00 6B 00 01 F5 D6
Command description	00 6B is the first state quantity Correction value register.

Response Command format and examples

Response description	Device address	Function code	Register address	Correction parameter	Check code
Response example	01	03	02	00 64	B9 AF<
Response example	01 03 02 00 64 B9 AF
Response description	Current device register.

2. Modify Correction value

Command description	Device address	Function code	Start Address	Correction value	Check code
Command format	01	06	00 6B	00 64	F9 FD
Sending example	01 06 00 6B 00 64 F9 FD
Command description	The current value plus 100 correction operation.

Response Command format and examples

Response description	Device address	Function code	Register address	Correction parameter	Check code
Response example	01	06	00 6B	00 64	F9 FD
Response example	01 06 00 6B 00 64 F9 FD
Response description	The parameters take effect immediately after a successful change.