Product description

The product is an industrial wall-mounted high-protection grade enclosure, with a protection grade of IP65, rain and snow proof and good air permeability. The circuit adopts American imported industrial-grade microprocessor chips and imported high-precision temperature and humidity sensors to ensure excellent product reliability, high precision and interchangeability. The output signal type is RS485, the farthest can communicate 2000 meters, the standard modbus protocol, supports secondary development.

1.2Features

1. Using high-precision temperature and humidity measurement unit, long-term stability and small drift

2. Using dedicated 485 circuit, standard ModBus-RTU communication protocol, communication address and baud rate can be set

3.10~30V wide voltage range power supply

4. Easy to install, can be wall-mounted or rail-mounted

5. High anti-dust protection level (IP65)

6. LCD liquid crystal display, beautiful and generous

7. Buttons can set parameters, easy to operate

1.3The main technical parameters

1.4Equipment size

1.5system framework

System scheme block diagram

2．Equipment installation instructions

2.1Inspection before equipment installation

Equipment List：

1. 1 set of temperature and humidity transmitter equipment

2. Certificate of conformity, warranty card, calibration report, etc.

3. 2 expansion plugs, 2 self-tapping screws

4. USB to 485 (optional)

5. 485 terminal resistance (gift for multiple devices)

2.2 Installation method

Wall mount

The back of the transmitter is equipped with a slide rail mounting plate. Remove the mounting plate first. There are two expansion plugs and two self-tapping screws in the accessories. First, punch two holes with a diameter of 5mm and a depth of ≥30mm on the wall (the opening spacing is 70mm). After inserting the expansion plug, fix the slide rail mounting plate to the wall with self-tapping screws, and finally slide the transmitter into it.

Slide rail installation

The back of the transmitter is equipped with a slide rail mounting plate. Remove the mounting plate first. The transmitter can be slid directly into the standard 35 rail。

Special Note：

1) There are certain specification requirements for 485 line field wiring. For details, please refer to the data package "485 Equipment Field Wiring Manual".

2) When the device is connected to the 485 bus, ensure that the addresses of multiple devices will not be repeated.

2.31 Wiring instructions.

Power and 485 signal

Wide-voltage power input can be 10~30V. When wiring the 485 signal line, pay attention to the two wires A\B not to be reversed, and the addresses of multiple devices on the bus cannot be conflicted.

2.4 Specific wiring

2.5Panel display description

If the device address is less than 100, the decimal address is displayed at the display location of the device address; if the device address is greater than 100, the hexadecimal address is displayed at the display location of the device address.

3. Configuration software installation and use 

（The device does not provide a communication line by default, the color of the line is for reference only）

4. letter of agreement

4.1 Basic communication parameters

4.2 Data frame format definition

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

Initial structure ≥ 4 bytes of time

Address code = 1 byte

Function code = 1 byte

Data area = N bytes

Error check = 16-bit CRC code

Time to end structure ≥ 4 bytes

Address code: the address of the transmitter, which is unique in the communication network (factory default 0x01).

Function code: The command function instruction issued by the host, this transmitter only uses function code 0x03 (read register data).

Data area: The data area is the specific communication data, pay attention to the high byte of the 16bits data first!

CRC code: two-byte check code.

Host query frame structure:

Slave response frame structure：

4.3 Register address

4.4 Communication protocol example and explanation

Example: Read the temperature and humidity value of the device address 0x01

Inquiry frame (hexadecimal):

Response frame (hexadecimal): (for example, the temperature is -10.1℃ and the humidity is 65.8%RH)

Temperature calculation:

When the temperature is lower than 0 ℃, the temperature data is uploaded in the form of complement code.

Temperature: FF9B H (hexadecimal) = -101 => temperature = -10.1℃

Humidity calculation:

Humidity: 292 H (hexadecimal) = 658 => Humidity = 65.8%RH