Nowadays, communication devices of the Internet of Things emerge in an endless stream, and many wireless terminal products stand out. 4G modem data transmission equipment is recognized by the industry because of its powerful transmission function and superior stability, and is one of the most commonly used products in the Internet of Things communication equipment.
Next, I will give a comprehensive explanation of the application scenario of 4G modem. Let's look down together!
The 4G modem data transmission device, as its name implies, is a wireless terminal device used to transmit data, which realizes two-way transparent data transmission.
The first 4G modem was developed in the 1920s, and multiplexing technology that met the 4G modem definition was used on the newswire;
● 4G modems were used on typewriters in the 1940s;
● In 1958, 4G modem was used in the military and was called intelligent 4G modem;
● After the emergence of wireless cellular network in the 1970s, 4G modem has developed into a wireless terminal device and become one of the important communication devices of the Internet of Things;
● In 1981, 4G modem was introduced into China.
● Around 1990, 4G modem products developed and designed by domestic manufacturers began to appear;
With the continuous development of 3G, 4G and Cat-1 networks, 4G 4G modem and NB-Iot 4G modem began to appear;
Nowadays, LoRa, WiFi, Bluetooth and other communication technologies are becoming more and more mature, and LoRa 4G modem, WiFi 4G modem and other devices are emerging.
The 4G modem is connected with a terminal device through an interface, and after acquiring data, the 4G modem performs wireless transmission through an operator network (2G/3G/4G/5G) and transmits the data to a designated data center or a device, and meanwhile, the reverse data center can also transmit the data or an instruction to the 4G modem through the operator network. Then the data is transmitted to the terminal equipment by the 4G modem through the interface, so as to realize real-time data acquisition, database service and other applications.
1) Data communication: TCP/IP protocol stack is integrated inside the 4G modem, which supports 4G/3G and short message dual-channel data transmission and supports data communication with multiple centers;
2) Data acquisition: collect serial device data, such as serial instrument, collector, PLC, etc.;
3) Support permanent online: 4G modem includes features such as power-on automatic dialing, using heartbeat package to ensure permanent online, compatibility with automatic reconnection after disconnection, automatic redialing, etc., and the device supports permanent online;
4) Provide permanent storage: the 4G modem terminal equipment can store the equipped parameters permanently in the device (such as FLASH and EEPROM). If it is powered on, the 4G modem will complete the work by itself according to the set parameters;
5) Remote management: support remote program upgrade, remote SMS configuration parameter query, remote device restart, and remote device parameter configuration;
6) Data encryption: support data encryption, and the encryption mode supports DES, 3DES and AES.
Classification by communication mode: Cellular Modem can be divided into LTE CAT 4 modem, LTE CAT 1 modem, LoRa 4G modem and CAN modem.
Classification by interface type: 4G modem generally supports RS485, RS232, I/O, TTL and other interfaces.
Classified by appearance: 4G modem can be divided into universal 4G modem and embedded 4G modem. There is little difference in function between the two. The main difference is whether there is a shell or not.
Green environment, as the development trend of future economy, has become a social consensus. With its advantages of low cost and flexible networking, 4G modem plays an important role in water conservancy monitoring, meteorological monitoring, earthquake disaster monitoring and other aspects, effectively solving the difficulties of large-scale real-time monitoring.
Today, with the development of industrial modernization, pipeline transportation has become an indispensable part of social progress. 4G modem is widely used in gas pipeline network, oil pipeline network, heating network monitoring, tap water pipeline network monitoring and other projects, making intelligent monitoring a reality.
The industrial field is related to the normal operation of the national economy. With the improvement of the level of industrial automation, 4G modem is more and more widely used in oil field monitoring, street lamp control, traffic control, vehicle guidance and other facilities. It plays an important role in effectively ensuring the safe operation of oil, transportation and other industries and improving the level of industrial management.
4G modem is widely used in the field of agriculture, which can monitor water supply, growth status, fertilization frequency and other data, and can also send control instructions for remote control according to any situation. According to its low cost, accurate data collection, timely and other characteristics, agricultural intelligence will become the main trend in the future.
The application of 4G modem in the power field has a history of more than ten years. From the previous manual inspection and maintenance to the present intelligent terminal equipment monitoring, 4G modem plays an important role in distribution monitoring, power grid automation, automatic meter reading, power grid dispatching and other projects, and the demand is still rising.
