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Humidity/Temperature Transmitter Sht20 Sensor Module Precision Temperature and Humidity Monitoring Industrial Modbus RS485
Humidity/Temperature Transmitter Sht20 Sensor Module Precision Temperature and Humidity Monitoring Industrial Modbus RS485
Product description:
the product adopts industrial chip, imported with high precision SHT20 the temperature and humidity sensor ensures the excellent reliability, high precision and interchangeability of the product. Using RS485 the hardware interface (with lightning protection design ), the protocol layer is compatible with the standard industry Modbus-Rtu protocol. The present set of products MODBUS the protocol is integrated with the common protocol. Users can choose the communication protocol by themselves. The common protocol has the automatic upload function ( connection RS485 the temperature and humidity will be automatically output through the serial port adjustment tool).
Product Highlights:
industrial products, high progress SHT20 the temperature and humidity sensor, RS485 communication;
standard MODBUS the protocol is integrated with the common protocol, and users can choose the communication protocol by themselves;
baud rate can be set by itself;
common protocols have automatic upload function, and the upload rate can be set by yourself.
Product parameters:
working voltage: DC4-30V(The maximum limit their statements to no more33V)
maximum power:0.2W
operating temperature: temperature-20℃+60℃ humidity0%RH-100%RH
control accuracy: temperature± 0.3℃(25℃) humidity±3%RH(25℃)
output interface: RS485 communication (standard MODBUS protocol and custom common protocol), see The Protocol Description
address: you can set1-247 the default value is1
baud rate: the default9600(Users can set it by themselves),8 bit Data,1 bit stop, no verification
size:60*30*18
0 x03: read holding registers
0 x04: read input registers
0 x06: write a single holding register
0 x10: write multiple hold registers
register type | register Address | the data content | the number of bytes |
the input register | 0x0001 | the temperature value | 2 |
0x0002 | humidity value | 2 | |
the holding register | 0x0101 | device address (1~247 (in Chinese)) | 2 |
0x0102 | the baud rate 0:9600 1:14400 2:19200 | 2 | |
0x0103 | temperature correction(/10) -10.0-10.0 | 2 | |
0x0104 | humidity correction value(/10) -10.0-10.0 | 2 |
the host sends a data frame:
the slave address | function Code | register Address the high byte | register Address the low byte | number of registers the high byte | number of registers the low byte | CRC the high byte | CRC the low byte |
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slave response data frame:
the slave address | in response to the function code | the number of bytes | register1 data the high byte | register1 data the low byte | register N data the high byte | register N data the low byte | CRC the high byte | CRC the low byte |
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MODBUS the command frame
the slave address | function Code | register Address the high byte | register Address the low byte | number of registers the high byte | number of registers the low byte | CRC the high byte | CRC the low byte |
0x01 | 0x04 | 0x00 | 0x01 | 0x00 | 0x01 | 0x60 | 0x0a |
slave response data frame:
the slave address | function Code | the number of bytes | temperature the high byte | temperature the low byte | CRC the high byte | CRC the low byte |
0x01 | 0x04 | 0x02 | 0x01 | 0x31 | 0x79 | 0x74 |
the temperature value= 0 x131, to decimal conversion305 actual temperature value = 305 / 10=30.5 ℃
note: temperature is marked16 decimal number, temperature value= 0 xFF33, to decimal conversion -205 the actual temperature= -20.5 ℃;
the slave address | function Code | register Address the high byte | register Address the low byte | number of registers the high byte | number of registers the low byte | CRC the high byte | CRC the low byte |
0x01 | 0x04 | 0x00 | 0x02 | 0x00 | 0x01 | 0xC1 | 0xCA |
slave response data frame:
the slave address | function Code | the number of bytes | humidity the high byte | humidity the low byte | CRC the high byte | CRC the low byte |
0x01 | 0x04 | 0x02 | 0x02 | 0x22 | 0xD1 | 0xBA |
humidity value= 0 x222, to decimal conversion546 actual humidity value= 546 / 10 = 54.6% ;
the slave address | function Code | register Address the high byte | register Address the low byte | number of registers the high byte | number of registers the low byte | CRC the high byte | CRC the low byte |
0x01 | 0x04 | 0x00 | 0x01 | 0x00 | 0x02 | 0x20 | 0x0B |
slave response data frame:
the slave address | function Code | the number of bytes | temperature the high byte | temperature the low byte | humidity the high byte | humidity the low byte | CRC the high byte | CRC the low byte |
0x01 | 0x04 | 0x04 | 0x01 | 0x31 | 0x02 | 0x22 | 0x2A | 0xCE |
take reading the slave address as an example:
the slave address | function Code | register Address the high byte | register Address the low byte | number of registers the high byte | number of registers the low byte | CRC the high byte | CRC the low byte |
0x01 | 0x03 | 0x01 | 0x01 | 0x00 | 0x01 | 0xD4 | 0x0F |
slave response frame:
the slave address | function Code | the number of bytes | the slave address the high byte | the slave address the low byte | CRC the high byte | CRC the low byte |
0x01 | 0x03 | 0x02 | 0x00 | 0x01 | 0x30 | 0x18 |
take modifying the slave address as an example:
the slave address | function Code | register Address the high byte | register Address the low byte | the register value the high byte | the register value the low byte | CRC the high byte | CRC the low byte |
0x01 | 0x06 | 0x01 | 0x01 | 0x00 | 0x08 | 0xD4 | 0x0F |
modify the slave address: 0x08=8
the slave response frame( and send the same):
the slave address | function Code | register Address the high byte | register Address the low byte | the register value the high byte | the register value the low byte | CRC the high byte | CRC the low byte |
0x01 | 0x06 | 0x01 | 0x01 | 0x00 | 0x08 | 0xD4 | 0x0F |
the slave address | function Code | the start address the high byte | the start address the low byte | number of registers the high byte | number of registers the low byte | the number of bytes | register1 the high byte | register1 the low byte | register2 the high byte | register2 the low byte | CRC the high byte | CRC the low byte |
0x01 | 0x06 | 0x01 | 0x01 | 0x00 | 0x02 | 0x04 | 0x00 | 0x20 | 0x25 | 0x80 | 0x25 | 0x09 |
modify the slave address: 0x20=32
the baud rate: 0x2580=9600
slave response frame:
the slave address | function Code | register Address the high byte | register Address the low byte | number of registers the high byte | number of registers the low byte | CRC the high byte | CRC the low byte |
0x01 | 0x06 | 0x00 | 0x11 | 0x00 | 0x04 | 0xD4 | 0x0F |
the ordinary version protocol
the baud rate of the default 9600(Users can set it by themselves), 8bit Data, 1bit stop, no verification
RS485 communication
serial commands | description |
READ | trigger a temperature and humidity report (27.4℃67.7% temperature27.4℃ humidity67.7%) |
AUTO | start the automatic report function of temperature and humidity ( ditto) |
STOP | stop Automatic temperature and humidity reporting function |
BR:XXXX | set the baud rate from 9600 to 19200 (BR:9600 the baud rate9600) |
TC:XX.X | set the temperature correction (-10.0~10.0) (TC:02.0 temperature correction2.0℃) |
HC:XX.X | setting the humidity calibration (-10.0~10.0) (HC:-05.1 humidity correction value is-5.1%) |
HZ:XXX | set the temperature and humidity report rate (0.5,1,2,5,10) (HZ:2 not only automatically reported rate 2) |
PARAM | read the current system settings
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PARAM instructions:
TC:0.0,HC:0.0,BR:9600,HZ:1-> temperature correction0.0 humidity correction value0.0 the baud rate9600 report rate 1Hz
SLAVE_ADD:1 -> MODBUS the slave address 0x01
Model Number : Sht20
Type : Voltage Regulator
Origin : Mainland China
Condition : New
