The application of E840-DTU (4G-03) in fresh cold chain transportation my country is a country with a large population and needs a lot of agricultural products. About 400 million tons of fresh agricultural products enter the market for consumption and circulation every year. How to avoid loss and waste of fresh agricultural products during transportation has always been a top priority for enterprises in the relevant industry chain.
1. The advantages of cold chain logistics are as follows:
a. It can improve the preservation ability of food;
b. Increase the storage period of food;
c. Fresh food can be circulated across regions. With the rapid development of domestic fresh food storage and preservation technology, the cold chain market continues to expand, and cold chain logistics companies continue to emerge, showing a development trend of networking, standardization, scale and grouping.
2. Application environment
Fresh cold chain intelligent logistics involves agriculture, transportation, technology, finance and other industries and sectors. We mainly discuss some technical applications in the intelligent transportation of cold chain. 4G/NB/GPRS/GPS/CAN company In cold chain logistics, refrigerated trucks are inseparable. The difference between refrigerated trucks and ordinary closed trucks is that they are equipped with refrigeration equipment, temperature and humidity sensors, acquisition controllers and GPS positioning functions. The usual intelligent cold chain transportation system structure is as follows:
E840-DTU(4G-03) Advantages
E840-DTU(4G-03) is a 4G serial server. Realize serial device and network server, support LTE-FDD, LTE-TDD, DC-HSDPA, HSPA+, HSDPA, HSUPA, WCDMA, TDSCDMA, CDMA, EDGE and GPRS network data connection, set by simple AT commands, you can easily Use this product to realize two-way data transparent transmission from serial port to network. With GPS positioning function, it supports customized access to GNSS global navigation satellite system.
3. Application
Through the E840-DTU (4G-03) network data transmission module, connect the data acquisition controller such as the temperature and humidity of the refrigerated truck, and upload the data to the network server. Real-time monitoring of refrigerated trucks by the system management platform and analysis of transportation trajectory data can be realized.
The network data transmission module has two working modes: transparent transmission mode and AT command mode.
The collection of data such as temperature and humidity is carried out in the transparent transmission mode through the serial port connection to the controller, and the GPS positioning information is obtained by inputting commands in the AT command mode. It is easy to switch between working modes. In the transparent transmission mode, the serial port sends “+++” and then sends any AT command within three seconds, and the module switches to the AT command mode. Send the command “AT+EXIT” to exit the AT command mode and automatically switch back to the transparent transmission mode.
Application Environment
Connect to the network server, open the E840 configuration software of the host computer, enter the configuration state, select the working mode network transparent transmission mode, and set the connection server address, port number, connection type and other parameters
Passive GPS antenna, receiving the latitude and longitude data of GPS positioning, the module can read the latitude and longitude data by inputting the AT command “AT+GPS”
The user obtains the latitude and longitude information through the serial port, and processing and analyzing the latitude and longitude information can make the corresponding positioning traceability function on the platform. The transmission application of physical data layer in cold chain logistics system can be realized through E840-DTU (4G-03).
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