Modbus SHT20 Sensor Module Temperature and Humidity Transmitter Detection Sensor Module RS485 Signal Analog output Rtu Protocol

Modbus SHT20 Sensor Module Temperature and Humidity Transmitter Detection Sensor Module RS485 Signal Analog output Rtu Protocol

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

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