Hőmérséklet és páratartalom távadó SHT20 érzékelő, nagy pontosságú felügyelet Modbus RS485 Dec12 Dropship
Temperature & Humidity Transmitter SHT20 Sensor High Precision Monitoring Modbus RS485 Dec12 Dropship
Temperature and humidity transmitter SHT20 sensor Modbus RS485
 
Product Description:
Product adopts industrial-grade chip, high-precision SHT20 temperature and humidity sensors, ensure the products with good reliability, high precision and interchangeability.
Adopt RS485 hardware interface (with the lightning protection design), the protocol layer compatible with standard industrial Modbus Rtu protocol.
This product integrating MODBUS protocol with ordinary, users can choose communication protocols, common agreement with automatic upload function(Connect the RS485 serial interface mode tool by automatically output temperature and humidity).
 
MODBUS PROTOCAL
Modbus Function Code:
0x03:Read keep register
0x04: Read input register
0x06:Write a single keep register
0x10:Write more keep registers
 
Modbus Frame format:
Master send format:
The responseformat of slave:
MODBUSCOMMAND
Master read temperature command frame(0x04):
The response data from slave:
Temperature value=0x131,converted to a decimal 305,the actual temperature value = 305 / 10 = 30.5°
Note: the temperature is signed hexadecimal number, temperature value = 0xFF33, converted to a decimal - 205, the actual temperature = -20.5 °;
 
Master read humidity command frame(0x04)
 
 
The response data from slave:
Humidity value = 0x222, converted to a decimal 546, actual humidity value = 546/10 = 54.6 % ;
Continuous read temperature and humidity command frame(0x04):
The response data from slave:
 
 
Read keep register(0x03):
Readdevice address from the slave:
The response data from slave:
 
Modify the contents of the registers(0x06):
Modify the slave address register:
Modify the slave address:0x08 = 8
 
The response data from slave(And send the same):
Continuously change keep registers(0x10):
 
Slave address :0x20 = 32
Baud rate :0x2580 = 9600
The response data from slave:
 
 
 
 
General Protocal
The default baud rates9600 (the user can set), 8 bits of data, one stop, no check
RS485
 
CMD

instructions
READ

Report triggered a temperature and humidity
(27.4°,67.7%  27.4°67.7% )
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)
TC:XX.X

Set the temperature calibration(-10.0~10.0)
(TC:02.02.0°)
HC:XX.X

Set the humidityration(-10.0~10.0)
(HC:-05.1  -5.1% )
HZ:XXX

Set the temperature and humidity reporting rate(0.5,1,2,5,10)
(HZ:2 reporting rate 2Hz)
PARAM

Read the system current Settings
 
PARAM CMD:
TC:0.0,HC:0.0,BR:9600,HZ:1  ->Temp calibration 0.0, Humi calibration0.0, Baud rate 9600,report rate 1Hz
SLAVE_ADD:1                      ->MODBU Slave address 1
1005002848333935 - advanced