Tzone Tz-tht01 Hvac Temperature Transmitter User Manual

TZONE TZ-THT01 Hvac Temperature Transmitter

Product Description

Product Description

TZ-THT01 temperature and humidity sensor has the characteristics of small size, stable operation, using standard Modbus-RTU communication protocol, and is suitable for use in various industrial environments.

Features

1. Four-wire interface with VCC/GND/RS485-A/RS485-B, simple and reliable, easy to expand
2. RS485 communication method
3. Data transmission based on Modbus-RTU industrial control bus protocol, with reliable performance and good compatibility
4. Small size, easy to install
5. Moisture-proof treatment for agricultural application environment, suitable for agricultural, industrial and other environments
6. Serial port configuration:
   Baud rate: 1200/2400/4800/9600/19200/38400/57600;
   Data bits: 8 bits; not configurable
   Check: No check; not configurable
   Stop bit: 1 bit; not configurable

After the configuration is completed, send a soft reset command or power off and restart to take effect;

Characteristic

1. Temperature and humidity sensor: SHT30
2. Measuring temperature range: -40℃ ~ +125℃
   Resolution: 0.1℃
   Accuracy: ±0.2℃
3. Range of working temperature: -40℃ ~ +80℃
4. Humidity measurement range: 0% ~ 100% (RH) Relative humidity resolution: 0. 1%RH Accuracy: ±2%RH( 25℃)
5. Working humidity range: 0% ~ 100% (RH)；
6. Power input: 5-24V DC；
7. Working current: 5mA
8. Line length: 1m
9. Waterproof level: IP65
10. Communicate protocol: Modbus-RTU
11. Device address code configurable range: 1~254

Interface Definition

• VCC: Power supply is positive, recommended 12VDC; Red Line
• GND: Power supply is negative, signal ground; Black Line
• RS485-A: Communication differential signal; Yellow Line
• RS485-B: Communication differential signal; Green Line

Factory Settings

1. Serial Port: Baud rate 9600, Data bits:8 bits, Stop bi: 1 bit, No parity bit；
2. Device address: Default address mode 0x01; (“0x**” represents hexadecimal numbers)

Protocol

For the Modbus-RTU protocol, please refer to the relevant information, here is only a brief introduction.

Data frame format

Note: The above is the default format of the sensor. If you need other formats, please specify when ordering.

RTU message frame format

THT-01 follows the RTU information frame protocol. In order to ensure the integrity of the information frame, a pause time of 3.5 characters or more is required at the beginning and end of each information frame (T1-T2-T3-T4, this time can be based on the wave Calculated by special rate), each byte of the information frame needs to be transmitted continuously. If there is a pause time greater than 1.5 characters, the sensor will treat it as invalid information and will not respond.

Information frame format

2.4 Register Definition

Address setting

You can specify when ordering, we will preset it for you, or you can modify it by yourself through the configuration software.

Baud rate setting

You can specify when ordering, we will preset it for you, or you can modify it by yourself through the serial port assistant.

Host reads sensor information (function code 03)

The sensor allows the host to use the function code 03 to read the temperature and humidity measurement value of the sensor and other information. The information frame format of the 03 code is as follows：

Host request information frame：

Sensor response information frame：

• Data analysis：
  • Temperature = 00FAH = 250 / 10 = 25.0℃；Humidity = 0258H = 600 / 10 = 60.0%RH；Reserved 1 = 0000H;
  • Reserved 2 = 0000H;
  • Address code = 0001H = 1;
  • Baud rate = 2580H = 9600;
  • Hardware version = 0600H;
  • Software version = 000AH = 10 = V1.0;

Note! If users only want to read the temperature and humidity or other registers, they only need to read the corresponding registers.

Host setting sensor information (Function Code 06)

This device can currently set the baud rate (register address is 0005H), and the message frame format as follows:

Host request information frame：

Sensor response information frame：

Data analysis: Set the baud rate to 9600

Abnormal response

When the host sends request information to the sensor, various errors may occur. At this time, the sensor sets the highest position of the function code to 1, and then returns an error code. The host can determine whether an error has occurred by detecting whether the highest bit of the function code is 1.

Return format:

Error code:

1. Illegal function code
2. Illegal data address
3. Illegal data value

CRC check code

RTU mode uses CRC-16 check, the check code occupies 2 bytes, if the check code is wrong, the sensor will ignore the host’s request and not respond.

The calculation method of CRC-16 check code is as follows:

1. Preset a 16-bit register as hexadecimal FFFF, call this register CRC register;
2. XOR the first 8-bit binary data (the first byte of the information frame) with the lower 8 bits of the 16-bit CRC register, and place the result in the CRC register;
3. Shift the content of the CRC register one bit to the right (toward the low bit) and fill the highest bit with 0, check the right shift out position after shift;
4. If the shifted out bit is 0, repeat step ③ (shift one bit to the right again), if the shifted out bit is 1, the CRC register is XORed with the polynomial A001 (1010 0000 0000 0001);
5. Repeat steps ③ and ④ until the right shift is 8 times, so that the entire 8-bit data has been processed;
6. Repeat steps ② to step ⑤ to process the next byte of the message frame;
7. After calculating all the bytes of the information frame according to the above steps, the content of the
8. CRC register obtained is: 16-bit CRC check code