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Homedll SHT20 Temperature humidity Sensor RS485 Modbus Suhu Kelembaban
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SHT20 Temperature humidity Sensor RS485 Modbus Suhu Kelembaban

Rp100.000

Pengenalan produk:

Produk ini mengadopsi chip tingkat industri, suhu dan kelembaban impor presisi tinggi SHT20 untuk memastikan keandalan yang sangat baik, presisi tinggi, dan pertukaran produk. Menggunakan antarmuka perangkat keras RS485 (dengan desain perlindungan petir), lapisan protokol tersebut kompatibel dengan protokol Modbus industri-rtu standar. Produk ini mengintegrasikan protokol MODBUS dan protokol umum. Pengguna dapat memilih protokol komunikasi. Protokol umum memiliki fungsi unggahan otomatis (menghubungkan RS485 melalui alat penyesuaian port seri secara otomatis akan mengeluarkan suhu dan kelembaban).

Parameter produk:
Nama produk: pemancar suhu dan kelembaban
Catu daya DC: DC 5 v-30 V
Sinyal keluaran: sinyal RS485
Akurasi suhu: ± 0.5 ℃ (25 ℃)
Akurasi kelembaban: ± 3% RH
Rentang suhu: 0% RH-80 % RJ
Resolusi suhu: 0.1 ℃
Resolusi kelembapan: 0.1% RH
Konsumsi daya peralatan: ≤ 0.2W
Alamat komunikasi: 1-247 dapat diatur, default 1
Protokol komunikasi: protokol Modbus-RTU dan protokol umum kustom
Kecepatan tambahan: dapat dikonfigurasi, 9600 standar, data 8-bit, berhenti 1-bit, tanpa parity
 
Kabel:

MODBUS  protocol

Function code used by the product:

0x03: Read holding register

0x04: Read input register

0x06: Write a single holding register

0x10: Write multiple holding registers

Register type

Register address

Data content

Number of bytes

 

input register

0x0001

temperature value

2

0x0002

Humidity value

2

 

 

holding register

0x0101

Device address

( 1~247 )

2

0x0102

baud rate

0:9600

1:14400

2:19200

2

0x0103

Temperature correction value (/10)

-10.0~10.0

2

0x0104

Humidity correction value (/10)

-10.0~10.0

2

 

 

Modbus communication format:

The host sends a data frame:

slave address

function code

Register address

high byte

Register address

low byte

Number of registers

high byte

Number of registers

low byte

CRC

high byte

CRC

low byte

 

 

 

 

 

 

 

 

The slave responds with data frame:

slave address

Response function code

Number of bytes

Register 1 data

high byte

Register 1 data

low byte

Register N data

high byte

Register N data

low byte

CRC

high byte

CRC

low byte

 

 

 

 

 

 

 

 

 

 MODBUS command frame

Host reads temperature command frame (0x04):

slave address

function code

Register address

high byte

Register address

low byte

Number of registers

high byte

Number of registers

low byte

CRC

high byte

CRC

low byte

0x01

0x04

0x00

0x01

0x00

0x01

0x60

0x0a

The slave responds with data frame:

slave address

function code

Number of bytes

temperature

high byte

temperature

low byte

CRC

high byte

CRC

low byte

0x01

0x04

0x02

0x01

0x31

0x79

0x74

 

Temperature value = 0x131, converted to decimal 305, actual temperature value = 305 / 10 = 30.5℃

Note: The temperature is a signed hexadecimal number, the temperature value = 0xFF33, converted to decimal -205, the actual temperature = -20.5℃;

 

The host reads the humidity command frame (0x04):

slave address

function code

Register address

high byte

Register address

low byte

Number of registers

high byte

Number of registers

low byte

CRC

high byte

CRC

low byte

0x01

0x04

0x00

0x02

0x00

0x01

0x90

0x0A

The slave responds with data frame:

slave address

function code

Number of bytes

humidity

high byte

humidity

low byte

CRC

high byte

CRC

low byte

0x01

0x04

0x02

0x02

0x22

0xD1

0xBA

Humidity value = 0x222, converted to decimal 546, actual humidity value = 546 / 10 = 54.6%;

 

Continuously read temperature and humidity command frames (0x04):

slave address

function code

Register address

high byte

Register address

low byte

Number of registers

high byte

Number of registers

low byte

CRC

high byte

CRC

low byte

0x01

0x04

0x00

0x01

0x00

0x02

0x20

0x0B

The slave responds with data frame:

slave address

function code

Number of bytes

temperature

high byte

temperature

low byte

humidity

high byte

humidity

low byte

CRC

high byte

CRC

low byte

0x01

0x04

0x04

0x01

0x31

0x02

0x22

0x2A

0xCE

 

Read the contents of the holding register (0x03):

Take reading the slave address as an example:

slave address

function code

Register address

high byte

Register address

low byte

Number of registers

high byte

Number of registers

low byte

CRC

high byte

CRC

low byte

0x01

0x03

0x01

0x01

0x00

0x01

0xD4

0x36

Slave response frame:

slave address

function code

Number of bytes

slave address

high byte

slave address

low byte

CRC

high byte

CRC

low byte

0x01

0x03

0x02

0x00

0x01

0x30

0x18

 

Modify the contents of the holding register (0x06):

Take modifying the slave address as an example:

slave address

function code

Register address

high byte

Register address

low byte

Register value

high byte

Register value

low byte

CRC

high byte

CRC

low byte

0x01

0x06

0x01

0x01

0x00

0x08

0xD8

0x30

Modify slave address : 0x08 = 8

 

Slave response frame ( same as sending ):

slave address

function code

Register address

high byte

Register address

low byte

Register value

high byte

Register value

low byte

CRC

high byte

CRC

low byte

0x01

0x06

0x01

0x01

0x00

0x08

0xD4

0x0F

 

Continuously modify the holding register (0x10):

slave address

function code

initial address

high byte

initial address

low byte

Number of registers

high byte

Number of registers

low byte

Number of bytes

Register 1 high byte

Register 1 low byte

Register 2 high byte

Register 2 low byte

CRC

high byte

CRC

low byte

0x01

0x10

0x01

0x01

0x00

0x02

0x04

0x00

0x20

0x25

0x80

0x25

0x09

Modify slave address : 0x20 = 32

Baud rate : 0x2580 = 9600

Slave response frame:

slave address

function code

Register address

high byte

Register address

low byte

Number of registers

high byte

Number of registers

low byte

CRC

high byte

CRC

low byte

0x01

0x10

0x00

0x11

0x00

0x04

0xD4

0x0F

 

 

                   Ordinary version agreement

The default baud rate is 9600 (the user can set it by himself), 8-bit data, 1-bit stop, no parity 

RS485 communication

 

Serial command

illustrate

READ

Trigger a temperature and humidity report

(27.4 ℃ , 67.7%  temperature 27.4 ℃ humidity 67.7%)

AUTO

Start the automatic reporting function of temperature and humidity

( same as above )

STOP

Stop the automatic reporting function of temperature and humidity

BR:XXXX

Set baud rate

9600~19200

(BR:9600  baud rate 9600)

TC:XX.X

Set up temperature calibration

(-10.0~10.0)

(TC:02.0 temperature correction value is 2.0 ℃ )

HC:XX.X

Set up humidity calibration

(-10.0~10.0)

(HC:-05.1  humidity correction value is -5.1%)

HZ:XXX

Set temperature and humidity reporting rate

(0.5,1,2,5,10)

(HZ:2  automatic reporting rate  2Hz)

PARAM

Read the current system settings

 

 

PARAM instruction:

TC:0.0,HC:0.0,BR:9600,HZ:1   ->Temperature correction value 0.0 Humidity correction value 0.0 Baud rate 9600 Reporting rate 1Hz

SLAVE_ADD:1     ->MODBUS slave address 0x01

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