RS485 3In1 Light Intensity Sensor Modbus Protocol Temperature and Humidity Transmitter Sensor

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RS485 3In1 Light Intensity Sensor Modbus Protocol Temperature and Humidity Transmitter Sensor

Specification:
DC power supply: 10-30VDC
Maximum power consumption: 0.4W
Accuracy:
Humidity: ± 3% RH (5% RH ~ 95% RH, 25C)
Temperature: ± 0.5C, (25C)
Light intensity: ± 7% (25C)
Light intensity range: 0-65535lux
Working temperature: -20 ~ 60C, 0% RH ~ 80% RH
Long-term stability:
Temperature: 0.1C / y
Humidity: 1% / y
Light intensity: 5% / y
Response time:
Temperature: 18S (1m / s wind speed)
Humidity: 6s (1m / s wind speed)
Light intensity: 0.1S
Output signal: RS485 output (Modbus protocol)

Cable color

instruction

Power

Brown

10~30V DC power +

Black

Power -

communication

yellow

485-A

blue

485-b

The default baud rate is 4800bit/s, and the default address is 0x01.
1. communication protocol

Code

8 bit binary system

Data bits

8bits

parity check bit

NO

stop bit

NO

Error checking

CRC

baud rate

2400bit/s4800bit/s9600 bit/s 4800bits by default


2. Using Modbus-RTU communication protocol, the format is as follows:

The initial structure is more than 4 bytes of time
Address code = 1 bytes
Function = 1 bytes
Data area = N bytes
Error check = 16 bit CRC code
The end of the structure is greater than or equal to 4 bytes of time
Address code: the address of the transmitter, which is unique in the communication network (factory default 0x01).
Function code: the instruction function instruction from the host. The transmitter only uses the function code 0x03 (read register data).
Data area: data area is specific communication data, pay attention to 16bits data before the high byte!
CRC Code: two byte check code

Host query frame structure:

Address code

Function code

Register start address

Register length

check code low

Check code high

1 bytes

1 bytes

2 bytes

2 bytes

1 bytes

1 bytes

Slave transponder frame structure

Address code

Function code

effective byte

No 1 Data area

NO2 Data area

No N Data area

Check code

1 bytes

1 bytes

1 bytes

2 bytes

2 bytes

2 bytes

2 bytes


3.Register address

Register address

PLC or configuration address

content

operation

0000 H

40001

humidity

read-only

0001 H

40002

temperature

read-only

0002 H

40003

Illuminance 0~200000Lux use unit 1Lux

read-only

0003 H

40004

0006 H

40007

Illuminance 0~65535 unit 1 Lux ,0~200000 unit 100Lux

read-only

4.Examples and explanations of communication protocols

4.1Read the temperature and humidity values of the device address 0x01

Query frame

Address code

Function code

Start address

Data length

check code low

Check code high

0x01

0x03

0x00 0x00

0x00 0x02

0xC4

0x0B

Response frames (for example, read the temperature of -10.1 degrees C and humidity of 65.8%RH)

Address code

Function code

effective byte

humidity

temperature

check code low

Check code high

0x01

0x03

0x04

0x02 0x92

0xFF 0x9B

0x5A

0x3D

.Temperature: when the temperature is below 0 degrees, it is uploaded in the form of complement
FF9B H (Hexadecimal) = -101 = -10.1 = > temperature c

Humidity:

292 H (Hexadecimal) =658=> humidity = 65.8%RH

4.2 Read the illumination value of the device address 0x01

(0~65535 reads in 1Lux or 0~200000 reads in a hundred Lux units)

Query frame

Address code

Function code

Start address

Data length

check code low

Check code high

0x01

0x03

0x00 0x06

0x00 0x01

0x64

0x0B

Response frames (for example, read illumination is 200000 Lux)

Address code

Function code

Returns the number of valid bytes

Data area

check code low

Check code high

0x01

0x03

0x02

0x05 0x30

0xBB

0x00


Illumination calculation description:

1) the product is 0~65535 range transmitter, the unit is 1Lux

0530 H (sixteen hex) = 1328=> illuminance =1328 Lux

2) the product is 0~200000 range transmitter, the unit is 100 Lux

0530 H (sixteen hex) = 1328=> illuminance =132800 Lux


4.3 Read the illumination value of the device address 0x01 (0~200000 is read as 1Lux)

Query frame

Address code

Function code

Start address

Data length

check code low

Check code high

0x01

0x03

0x00 0x02

0x00 0x02

0x65

0xCB

Response frames (for example, read illumination is 200000 Lux)

Address code

Function code

Significant bytes

High light intensity

low light intensity

check code low

Check code high

0x01

0x03

0x04

0x00 0x03

0x0D 0x40

0x0F

0x53

Illumination calculation description:

This protocol is only used under the 0~200000Lux range transmitter, 1Lux
30D40, H (sixteen hex) = 200000=>, illuminance =200000, Lux

4.4 Read the temperature, humidity, and illumination values of the address 0x01 of the device

(0~65535 reads in 1Lux or 0~200000 reads in a hundred Lux units)

Query frame

Address code

Function code

Start address

Data length

check code low

Check code high

0x01

0x03

0x00 0x00

0x00 0x07

0x04

0x08

Response frames

Address code

Function code

Bytes

humidty

temperature

**

Illuminance

Check code

0x01

0x03

0x0E

0x02 0x92

0x80 0x65

00 Fill

0x05 0x30

0xC4 0x33

4.5 Read the temperature, humidity, and illumination values of the address 0x01 of the device

(0~200000 reads in 100 Lux units)

Address code

Function code

Start address

Data length

check code low

Check code high

0x01

0x03

0x00 0x00

0x00 0x04

0x44

0x09

Response frames

Address code

Function code

Bytes

humidty

temperature

Illuminance high

Illuminance low

Check code

0x01

0x03

0x03 0x08

0x02 0x92

0x80 0x65

0x00 0x03

0x0D 0x40

0x01 0x6F

5. The device cannot connect to PLC or computer

Possible causes:

1) the computer has multiple COM ports, and the choice is incorrect.
2) device address error, or the existence of repeated address devices (factory default all 1).
3) baud rate, check mode, data bits, stop bit error.
4) The 485 bus is disconnected, or the A and B lines are reversed.
5) If the number of devices is too large or the wiring is too long, the power should be supplied nearby, add 485 booster, and increase the resistance of 120 terminal.
6) The USB to 485 driver is not installed or damaged.

7) Equipment damage.
Package includes:

1xTemperature and Humidity Transmitter Sensor

Details Pictures:



(n/a)RS485 3In1 Light Intensity Sensor Modbus Protocol Temperature and Humidity Transmitter Sensor
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