Temperature and humidity transmitter

DDFB485

1、 Function Introduction

DDFB485typeTemperature and humidity transmitterforRS-485Bus type, usingRS485interface,Can achieve simultaneous monitoring of multiple points,Networking and remote transmission, with on-site digital display function.

1.contact method

This product adoptsRS485/RS232(Customizable) interface method, using widely used in the industrial fieldModbusThe data communication protocol enables direct connection with various control devices, display instruments, and computers for data communication.

2.Remote transmission function

adoptRS485interface,The maximum transmission distance is1200rice.It can achieve remote monitoring and control of temperature and humidity.

3.Networking function

Multiple DDFB485 unitsThe transmitters are connected in series through a bus, and each transmitter requires an external power supply for separate power supply. The bus endpoint is connected to the computer serial port through a digital signal converter. Multi point monitoring centered around the receiving device can be achieved to achieve centralized control and management over a large area. The same network can monitor up to32A monitoring point.

4.On site display

DDFB485?The model also has on-site display function, which can directly observe the temperature and humidity changes on site through the display panel.

2、 Technical parameters

3、 Setting up

When using this product for the first time, initialization settings must be made to complete the parameter settings for communication between the device and the upper computer. The adjustable parameters include: baud rate setting (1200bps, 2400bps, 9600bps, 19200bps, 38400), communication address setting (001->255). The specific setting method is as follows:

DDFB485?The parameters of the model can be set through the peripheral keyboard, and the specific method is as follows:

DDFB485?Dial Settings

M :Function key, confirmation key

C :Exit button

▲: Up key

▼: Down button

Parameter settings for the panel:

Address setting

Long press the M key, the LCD will display the settings menu, * page

Set the address within the range of 1 to 255

Adjust the address code using the ▲ and ▼ keys, and once the adjustment is complete

Press the M key again to confirm the settings, and press the C key to exit the settings

state

Baud rate setting

Long press the M key, the LCD will display the settings menu, press M again

Switch to the second page baud rate setting interface with the key, baud rate setting

The range is 2400-38400, which can be accessed through the ▲ and ▼ keys

Adjust the baud rate and press the M key for the third time after the adjustment is complete,

Confirm the settings and press the C key to exit the settings state.

display switching

Pressing the ▲ or ▼ keys during normal display can switch between displaying humidity and dew point data. When entering the functional realm

If there is no operation or pressing the C key for 10 seconds after the face or setting interface, the setting will exit

The data will not be saved.

4、 Installation and use

The main body of this product is wall mounted installation, which can be fixed on walls, cabinet side walls, and other places.

1.Installation method:

• The main installation dimensions are shown in Figure 1:

Figure 1. Dimensions of the transmitter

• Use self tapping screws to fix the transmitter host to the wall, with a center to center distance of 105mm between the two fixing holes;
• After the transmitter is securely installed, power supply and communication can be carried out.

2.Power Supply and Communication

After the installation of the transmitter host is completed, power supply and communication can begin:

• It is recommended to use a 12V or 24V standard power supply for power supply. In the wiring terminals, the red wire is the positive pole of the power supply, and the black wire is the negative pole of the power supply.
• When the power is turned on, the green indicator light in the lower right corner of the transmitter mainframe starts flashing with a cycle of 1 second per time, indicating that the transmitter has started working normally; When the indicator light is constantly on, it indicates that the transmitter is not working properly and the overall circuit needs to be checked for reverse connection; When the indicator light is off, it means that the transmitter has not started working. Please check the power connection.
• After checking that the transmitter is working properly, turn off the power. According to the definition of terminal blocks, connect the yellow "A" terminal of the terminal block to the "D+" terminal of the "RS485-232 converter"; Connect the blue "B" end to the "D -" end of the "RS485-232 converter" and connect the nine pin serial port of the "RS485-232 converter" to the computer. Communication between hardware devices and computers can be achieved (as shown in Figure 2). If usedWe provide software for communication. For detailed information, please refer to.

Figure 2. DB485GM Wiring Instructions

5、 Networking method

The transmitter follows the standardRS485For the communication interface, the communication protocol adopts the widely used one in the industrial fieldModbusCommunication protocol, multiple transmitters backup through485Bus serial connection, each device is powered separately by an external power supply, and the bus endpoint is connected to the computer serial port through a digital signal converter. For specific networking and terminal connection methods, please refer to the diagram3, picture4.

Figure 3. Schematic diagram of lead connection

picture4.Networking diagram