To access the Internet from any device (PC, tablet, or smartphone), a 4G cellular modem or hotspot is required.Most broadband and mobile Lte modems operate on "4G" or fourth generation network systems.While many of the basic principles of Internet connectivity are consistent with 4G cellular modem technology,But there are many changes that affect how users connect to the network and stay connected. So what exactly is a 4G cellular modem?
The Chinese name of 4G cellular modem is "data transmission terminal".Is specially used for converting IP data into serial port data or converting serial port data into IP data,A wireless terminal device that transmits data.The 4G cellular modem can also realize the function of wireless network data transmission. According to the different transmission modes and networks used in data transmission,4G modem devices can be divided into many types, such as 4G DTU, Cat-1 DTU, NB-IoT DTU and LORA DTU.The 4G cellular modem is a wireless data transmission terminal that uses the 4G network for data transmission.Nowadays, with the continuous development of the Internet of Things industry, more and more manufacturers produce Internet of Things equipment.Different manufacturers integrate different functions on 4G cellular modem devices according to different requirements.
The working principle of 4G modem is to connect terminal equipment through interface.Get the data and then transmit it wirelessly through the operator's network (2G/3G/4G/5G) to the designated data center or device.At the same time, the reverse data center can also send data or instruct the operator network to transmit to the 4G modem.The 4G modem can interface to the terminal device.
1. Support TCP/UDP/HTTP/MQTT multiple network protocol servers
2. Modbus polling function is supported, and 4G modem can be used as a master station for active polling acquisition.Multiple RS485 lower computer devices are determined according to the acquisition cycle.
3. Support custom login package/heartbeat package. The heartbeat package supports setting the sending interval to prevent network disconnection and dead links.The content of the heartbeat packet can be customized, and the heartbeat packet mechanism ensures that the device is continuously online.
4. Support 3-way Socket link, and each Socket works independently for data transmission, multi-server data transmission, backup, and abnormal diagnosis.
5, support script programming, users can achieve custom functions through script programming
6. Remote parameter modification and remote upgrade. With the remote management platform, remote parameter modification and remote firmware upgrade can be realized.In order to ensure long-term reliable and stable operation, save traffic and time.
The 4G modem can be simply divided into an industrial 4G modem and an ordinary 4G modem according to different hardware facilities used,The main difference between them lies in the different environments in which they are used. Industrial 4G modem is more suitable for harsh environments such as industrial field and outdoor environment.Ordinary 4G modem is more suitable for indoor operation environment.
Lte modems is a kind of terminal equipment widely used in data transmission of industrial Internet of Things.All kinds of sensor serial port raw data are transmitted to Lte modems to 4G network through RS485/232, two-way transparent transmission.Support Modbus RTU to TCP/MQTT.It is widely used in remote power monitoring, hydrological and water resources monitoring, monitoring and early warning of mountain torrents and geological disasters, environmental pollution monitoring and meteorological data.Collection, forest fire prevention monitoring and other fields.
