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Temperature Humidity Sensor

Temperature Humidity Sensor (BGT-WSQ)

BGT-WSQ Atmospheric Temperature, Humidity & Pressure Sensor is a professional measurement of air temperature, relative humidity & barometric pressure. Sensors are built-in the water-proof and anti-UV shelter. It is widely used in agriculture, forestry, meteorology as well as a climate chamber, greenhouse, warehouse and other places. This model is equipped with 11 plates radiation shield to protect the sensors from solar radiation and rain.

Technical Parameter

Radiation Shields: 11 plates (Standard) □ Other
Pressure Parameter: Range:300～1100hPa
Accuracy： ±1hPa（25℃ Standard） ±0.5hPa（25℃ High version）
Resolution: 0.1hPa
Temperature Humidity Sensor Parameter
Temperature Range:-40～100℃
Resolution: 0.1℃
Accuracy: ±0.3℃ (Standard)  ±0.2℃（High version）
Humidity Range：0～100%RH
Resolution:0.1%RH
Accuracy:  ±3%RH (Standard)  ±1.8%RH (High version)
Power supply：□ DC 5V
 DC 9-30V
□ Other
Output signal：□ RS232（□Modbus □ASCII）
 RS485（Modbus ASCII）
Cable Length： Standard 2 M □ Other
Working environment: Temperature -40℃～80℃ Humidity ≤100%RH (No condensation)
Ingress Protection: IP45
Weight: 700 g（With radiation shield）
Power consumption: 150mW

Wiring Method

If the sensor is equipped with our data logger, directly use the sensor cable to connect the sensor with the corresponding interface on the data logger

If the sensor is purchased separately, the order of the wires as followed:

Color	Signal output
Color	RS485	RS232
Red	Power+	Using RS485 to RS232 adapter
Black	485 A+
Yellow	485 B-
Green	Power GND

Communication Protocol

1. If you are using a single sensor connected to the computer to read data directly, it is recommended to use the ASCII private protocol , you can visual display in ASCII (hex send, non-hex receive);

2. If you are multi-sensor connected to the PLC,configuration or access programmable collector, it is recommended to use the Standard ModBus-RTU protocol (see below, hex send and receive)

Standard ModBus-RTU Protocol

1. .The serial format 8 data bits, 1 stop bit, no parity bit. Baud rate 9600 bps, serial debugging software set to send and receive hex, the two communication intervals of at least 1000ms, the instructions in the CRC for the parity bit, two bytes. Default address.

2. If you are multi-sensor connected to the PLC,configuration or access programmable collector, it is recommended to use the Standard ModBus-RTU protocol (see below, hex send and receive)

Communication Format

Send	00	10	01	01	C1	B1
Description	Old address			New address	CRC Check
Return	00	10	01	01	C1	B1
Description	Old address			01Write success 00 Write fail	CRC Check

Read device address(eg: read device address 01)

Send	00	03	00	01	00	01	D4
Description	Address						CRC Check
Return	00	03	02	00	01	44	44
Description	Address				01	Device address	CRC Check

Read device baud rate (eg: read baud rate =9600)

Send	01	03	00	01	00	01	85	CF
Description	Address	Read	Start Address		Read points		CRC Check
Return	01	03	00	10	00	01	85	CF
Description	Address	Read	Data Length	Device address		CRC Check

Baud rate = data*4800. Return data 00 02, then baud rate =4800*2=9600

Write device communication baud rate (e.g.: write baud rate of 9600.)

Send	01	06	00	01	00	02	09	CF
Description	Address	Write	Start Address		New baud rate		CRC Check
Return	01	06	00	01	00	02	09	CF
Description	Address	Write	Start address		New baud rate		CRC Check

Baud rate = data *4800. Return data 00 02, then baud rate =4800*2=9600. The supported baud rates are 4800, 9600,14400, 19200, 38400, 57600, 115200. If other unsupported baud rates are written, they will be automatically restored to 9600 after restart. If returns 01 86 ****, it indicates that the configuration was not successful.

Read temperature humidity & pressure data(eg: read data of address)

Send	01	03	00	00	00	03	05	CF
Description	Address		Start Address		Read points		CRC Check
Return	01	03	06	27	1A	01	ID	02	AD	2F	47
Description	Address		Data Byte	Pressure		Temperature		Humidity		CRC Check

Sensor returned data is 0x271A 0x011D，0x02AD which will convert to decimalism, and add 1 decimal point,which are mean pressure value 1001.0hPa, temperature value 28.5, humidity value 68.5% RH

Read temperature and humidity integrative data(eg: read data of address 1）

Send	01	03	00	00	00	02	c4
Description	Address		Start Address		Read points		CRC Check
Return	01	03	04	01 1D	02 AD	AB	14
Description	Address		Data Byte	Temperature	Humidity	CRC Check

Sensor returned data is 0x011D，0x02AD which will convert to decimalism, and add 1 decimal point,which are mean temperature value 28.5, humidity value 68.5% RH.

Read individual data of temperature/ humidity/pressure(e.g read data of address 1）

Send	01	03	00	00	00	01	84
Description	Address		Start Address		Read points		CRC Check
Return	01	03	02	01	ID	79	DD
Description	Address		Data Byte	Temperature （Humidity /Pressure）		CRC Check

Sensor returned data is 0x011D which will convert to decimalism, and add 1 decimal point, which is mean temperature value 28.5.

Change communication protocol (eg. Switching to ASCII protocol)

Send	01	06	00	14	00	03	89	CF
Description	Address	Write	Start Address		01-MODBUS 03-ASCII		CRC Check
Return	01	06	00	14	00	03	89	CF
Description	Address	Write	Start address		data		CRC Check

Return 01 86 ****it indicates that the configuration was not successful. Change the protocol from 01-MODBUS to 03-ASCII.

1. The serial format Data bit 8, stop bit 1, parity bit none. Baud rate 9600bps, two communication intervals at least 1000ms

Communication format 【 1 】 Write new device address(e.g: write address 01)Communication format 【 1 】 Write new device address(e.g: write address 01)

ASCII Private protocol

Send	AA	00	10	00	01
Description	Start	Broadcast address	Write	Write address	New address
Return	OK
Description	Write new address successfully

【2】Read device address

Send	AA	00	03	00
Description	Start	Broadcast address	Read	Read address
Return	Address=001
Description	Read address is 1

【3】Read real-time data

Send	AA	01	03	0F
Description	Start	Device address	Read	Read address
Return	T=-20℃，H=60.1%RH，P=1010.1hPa
Description	Return value is temperature, humidity and pressure

【4】Change protocol (eg.: switching to MODBUS protocol）

Send	AA	01	10	01	01
Description	Start	Address	Write	Write protocol	01-MODBUS 03-ASCII
Return	OK
Description	Write new protocol successfully

Change the protocol from 03-ASCII to 01-MODBUS. In the above description, the transition characters such as spaces are ignored. Serial software (such as SSCOM3.3) check HEX sent, do not check the HEX display. After the device is powered on, it will return start.

【Modbus CRC Check steps

1. Preset 16-bit register hexadecimal FFFF, said the register for the CRC register

2. The first 8-bit data and CRC register low or XOR, the result placed in the CRC register

3. The contents of the register to the right one (toward the low),with 0 to fill the most significant bit, check the lowest bit

4. If the least significant bit is 0: Repeat step 3 (shift again) If the least significant bit is 1: The CRC register is XOR'ed with the polynomial A001 (1010 0000 0000 0001)

5. Repeat steps 3 and 4 until 8 shifts to the right so that the entire 8-bit data is completely processed

6. Repeat step 2 to step 5 for the next 8-bit data processing

7. The resulting CRC register is the CRC code (the resulting CRC code is low after high).

Attentions in Use

1.Please check the packaging is intact, and check the product model is consistent with the selection.

2. Do not live wiring, check the wiring is completed after the correct power.

3. Sensor length will affect the product output signal, do not use when changing products, if there is a need to change, please contact with the manufacturer.

4.. Sensor is a precision device, the user when in use,please do not disassemble, with sharp objects or corrosive liquid contact with the sensor surface, so as not to damage the product.

Trouble shooting

1.Analog signal or RS232, RS485 output instrument display value is not correct. May not be able to get the correct data due to wiring problems or communication serial port failure. Please check the wiring is correct, solid,serial port is occupied, the serial port settings are correct.

2. . If not for the above reasons, please contact the manufacturer.

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