RS485 온습도 센서 -SHT20
(Modbus RS485 Temperature Humidity Sensor -SHT20 )
개요
- 본 제품은 RS485 온습도 센서 -SHT20 입니다.
- SHT20 기반의 온습도 센서로 산업용 Modbus RS485 인터페이스를 가지고 있는 제품입니다.
- -20도에서 60도까지 온도를 측정하며, 0-100% RH 습도를 측정합니다.
- 4-30VDC로 동작합니다.
특징
-
Working voltage:DC4-30 v(the highest do not exceed33 v)
The most powerful:0.2 W.
Working temperature:The temperature- 20℃+ 60℃Humidity,0% RH to 100% RH
Accuracy:The temperature+ / - 0.3℃(25℃)Humidity,(25 + / - 3% RH℃)
Output interface:RS485Communication (standardMODBUSProtocol and custom ordinary), as shown in the agreement
Device address:Can be set up1-247.By default,1
Baud rate:The default9600(the user can set),8Bits of data,1A stop, without checking
Size:60 * 30 * 18
문서
-
MODBUS Protocol
Function code used for the product:
0 x03:Reading a keep register
0 x04: Read input register
0 x06:Write a single register
0 x10:Write more keep registers
Register type
Register address
The data content
The number of bytes
The input registers
0x0001
Temperature value
2
0 x0002
Humidity value
2
Keep a register
0 x0101
Device address
(1-247)
2
0 x0102
Baud rate
0:9 600
And 400
200:
2
0 x0103
The temperature at(/ 10)
10.0 ~ 10.0
2
0 x0104
Humidity is revised(/ 10)
10.0 ~ 10.0
2
Modbus The communication format:
The host to send data frames:
From the machine address
Function code
Register address
High byte
Register address
The low byte
Register number
High byte
Register number
The low byte
CRC
High byte
CRC
The low byte
The response data from the machine frame:
From the machine address
The response function code
The number of bytes
register1data
High byte
register1data
The low byte
registerNdata
High byte
registerNdata
The low byte
CRC
High byte
CRC
The low byte
MODBUSThe command frame
Host read temperature command frame(0 x04):
From the machine address
Function code
Register address
High byte
Register address
The low byte
Register number
High byte
Register number
The low byte
CRC
High byte
CRC
The low byte
0 x01
0 x04
0x00
0 x01
0x00
0 x01
0 x60
0 x0a
The response data from the machine frame:
From the machine address
Function code
The number of bytes
The temperature
High byte
The temperature
The low byte
CRC
High byte
CRC
The low byte
0 x01
0 x04
0 x02
0 x01
0 x31
0 x79
0 x74
Temperature value= 0 x131,Converted to a decimal305, the actual temperature = 305/10 = 30.5℃
Note: the temperature is a symbol16Hexadecimal number, temperature= 0 xff33,Converted to a decimal - 205., the actual temperature= 20.5℃;
Host read humidity command frame(0 x04):
From the machine address
Function code
Register address
High byte
Register address
The low byte
Register number
High byte
Register number
The low byte
CRC
High byte
CRC
The low byte
0 x01
0 x04
0x00
0 x02
0x00
0 x01
0 xc1
0 xca
The response data from the machine frame:
From the machine address
Function code
The number of bytes
humidity
High byte
humidity
The low byte
CRC
High byte
CRC
The low byte
0 x01
0 x04
0 x02
0 x02
0 x22
0 xd1
0 xba
Humidity value= 0 x222,Converted to a decimal546, the moisture content of the actual value= 546/10 = 54.6%;
Continuous read temperature and humidity command frame(0 x04):
From the machine address
Function code
Register address
High byte
Register address
The low byte
Register number
High byte
Register number
The low byte
CRC
High byte
CRC
The low byte
0 x01
0 x04
0x00
0 x01
0x00
0 x02
0 x20
0 x0b
The response data from the machine frame:
From the machine address
Function code
The number of bytes
The temperature
High byte
The temperature
The low byte
humidity
High byte
humidity
The low byte
CRC
High byte
CRC
The low byte
0 x01
0 x04
0 x04
0 x01
0 x31
0 x02
0 x22
0 x2a
0 xce
Read the contents of the registers(0 x03):
Take the case of reading from the machine address:
From the machine address
Function code
Register address
High byte
Register address
The low byte
Register number
High byte
Register number
The low byte
CRC
High byte
CRC
The low byte
0 x01
0 x03
0 x01
0 x01
0x00
0 x01
0 xd4
0 x0f
Response from the machine frame:
From the machine address
Function code
The number of bytes
From the machine address
High byte
From the machine address
The low byte
CRC
High byte
CRC
The low byte
0 x01
0 x03
0 x02
0x00
0 x01
0 x30
0 x18
Modify the contents of the registers(0 x06):
To modify the machine address, for example:
From the machine address
Function code
Register address
High byte
Register address
The low byte
Register values
High byte
Register values
The low byte
CRC
High byte
CRC
The low byte
0 x01
0 x06
0 x01
0 x01
0x00
0 x08
0 xd4
0 x0f
Modify the machine address: 0 x08 = 8
The response from the machine frame(And send the same):
From the machine address
Function code
Register address
High byte
Register address
The low byte
Register values
High byte
Register values
The low byte
CRC
High byte
CRC
The low byte
0 x01
0 x06
0 x01
0 x01
0x00
0 x08
0 xd4
0 x0f
Continuously change keep registers(0 x10):
From the machine address
Function code
The starting address
High byte
The starting address
The low byte
Register number
High byte
Register number
The low byte
The number of bytes
register1High byte
register1The low byte
register2High byte
register2The low byte
CRC
High byte
CRC
The low byte
0 x01
0 x06
0 x01
0 x01
0x00
0 x02
0 x04
0x00
0 x20
0 x25
0 x80
0 x25
0 x09
Modify the machine address: 0 x20 = 32
Baud rate: 0 x2580 = 9600
Response from the machine frame:
From the machine address
Function code
Register address
High byte
Register address
The low byte
Register number
High byte
Register number
The low byte
CRC
High byte
CRC
The low byte
0 x01
0 x06
0x00
0x11
0x00
0 x04
0 xd4
0 x0f
Ordinary version of the agreement
The default baud rates,9600(the user can set),8Bits of data,1A stop, without checking
RS485 communication
A serial port command
instructions
READ
Report triggered a temperature and humidity
(27.4℃67.7%, The temperature27.4℃ humidity67.7%)
AUTO
Start the temperature and humidity automatically report function
(Same as above)
STOP
Stop the temperature and humidity automatically report function
BR: XXXX
Set the baud rate
9600 ~ 19200
(BR: 9600 Baud rate for9600).
TC: XX. X
Set the temperature calibration
(10.0 ~ 10.0)
(TC: 02.0Revised for temperature2.0℃)
HC: XX. X
Set the humidity calibration
(10.0 ~ 10.0)
(HC: 05.1 Humidity is revised- 5.1%)
HZ: XXX
Set the temperature and humidity reporting rate
(0.5, 1,2,5,10)
(HZ: 2 Automatically report rate 2 hz)
PARAM
Read the system current Settings
PARAMinstruction:
TC: 0.0, HC: 0.0, BR: 9600 HZ: 1- >The temperature at0.0Humidity is revised0.0Baud rate9600Report the rate 1 hz
SLAVE_ADD: 1. - >MODBUSFrom the machine address 0 x01
