KDA-T10 CẢM BIẾN NHIỆT ĐỘ VÀ ĐỘ ẨM CÓ TRUYỀN THÔNG (modbus rtu)

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KDA-T10

PRODUCT  MANUAL

1. Product overview

The KDA-T10 temperature and humidity transmitter adopts a high-precision temperature and humidity sensor that integrates temperature and humidity. Real-time collection of temperature, humidity, dew point temperature and wet bulb temperature with a low-power ST single-chip microcomputer has overcome the traditional mode temperature and humidity sensors (such as: thermal low resistance, platinum resistance, etc.) are unstable, large errors, susceptible to interference, serious defects such as emboldened calibration are required. The output signal is a digital signal, which can easily communicate with the computer room to monitor the host or other industrial computer networking, temperature and humidity values can be read out through RS485 in real time, with accuracy, stability and service life long and other characteristics.

Features

• Adopt Swiss Sensirion latest high-precision digital temperature and humidity sensor (SHT30), high sensitivity and stability. Good qualitative, full range automatic temperature compensation.

• The MCU adopts ST's professional and leading high-quality low-power chips to ensure processing capacity and stability.

• Standard RS485 output communication interface, adding a self-recovery fuse to enhance its stability, of which RS485 can Enough to realize long-distance communication.

• Use the standard Modbus-RTU communication protocol widely used in industrial fields.

• There is a DCDC converter chip inside, which converts the high voltage into the 5V voltage used by the module, and provides Stable power supply, no heat, high conversion efficiency!

• It has the function of restoring to the factory. Open the shell and short-circuit the restoring jumper cap to make the module restore the factory default Setting to prevent the trouble caused by forgetting to change the slave address or baud rate

• It can output float and integer temperature and humidity data, and can output dew point temperature and wet bulb temperature, which is convenient for customers to choose and use.

Technical parameter index:

Application areas:

KDA-T10 temperature and humidity transmitter can be used in industrial field measurement, telecommunication base station, production workshop, warehouse, temperature and humidity monitoring in agricultural greenhouses, hospitals, laboratories, hotels, warehouses, construction sites, …

Product installation method:

KDA-T10 has a beautiful and small appearance, standard rail structure design, easy to install, and can also be installed indoors, ceiling installation.

1. Product details

Interface definition:

1. Instructions for use:

Protocol:

The KDA-T10 temperature and humidity transmitter adopts the Modbus-RTU protocol. For details, please refer to related materials. Here is only a brief introduction:

Data frame format:

Note: The transmitter defaults to 9600, no parity, 8 data bits, and 1 stop bit. If you need other functions, you need to order.

RTU information frame format:

The temperature and humidity transmitter follows the protocol of RTU message frame, and the message frame format is as follows:

The host reads the transmitter measurement value and setting parameters (function code 0x03/0x04/0x06/0x10)

The temperature and humidity transmitter allows the host to use the function code 03/04 to read the temperature and humidity measurement values of the transmitter, and the host can use the 0x06/0x10 function code to set the parameters of the temperature and humidity transmitter. The register list is as follows:

Examble:

EX1: Read temperature and humidity measurement values (read temperature, humidity and dew point temperature):

• Host sends: 01 03 02 00 00 03 04 73

• Reply from the machine: 01 03 06 01 0B 01 31 00 50 D5 6A

EX2:  Set the parameters of the transmitter (change the device address):

• Host sends: 01 06 01 00 00 02 09 F7

• Slave machine reply: 01 06 01 00 00 02 09 F7

EX3:  Set the parameters of the transmitter (change the device address and baud rate):

• Host sends: 01 10 01 00 00 02 04 00 02 00 03 1F FE

• Slave machine reply: 01 10 01 00 00 02 40 34

• Convert the returned hexadecimal data to decimal and divide by 10 to get the corresponding temperature and humidity value. The temperature and humidity value returned in the above example is:

• Temperature = 0x010B = 267/10 = 26.7°C; 

• Humidity = 0x0131 =305 / 10 = 30.5%RH. 

• Dew point temperature=0x0050=80 /10 = 8℃ 

• When the read temperature is lower than 0℃, the temperature register is the complement of the current temperature value. If the value in the temperature register is 0xFF9D, the current temperature is: 

• Temperature = 0xFF9D = -99/ 10 = -9.9℃;

Module restore factory settings instructions:

If the baud rate or modbus address of the device is changed and the device is forgotten during use, it needs to restore the factory settings. Just short-circuit the two vias of the module marked "RENEW" in the position as shown in the figure, and the light flashes quickly to restore the default 9600 baud rate and address 1.