What can LTE Modem Do for us?

PublishTime： 2023-09-16 Article Source：usr News

LTE Modem is a kind of wireless data terminal equipment of the Internet of Things, and its main function is wireless remote data transmission. The working principle of Lte Modem is to use the network provided by the operator, through the use of high-performance industrial 8/16/32-bit communication processors and industrial wireless modules, under the cooperation of embedded real-time operating system, to provide RS232 and RS485 (or RS422) interfaces, which can directly connect with serial devices. Thereby realizing the transparent data transmission function.

LTE Modem has been widely used in power, environmental protection, LED information release, logistics, hydrology, meteorology, and other fields. Although the application scenarios are different, they all use the same basic principles.

The four core functions of the Lte Modem:

Fig.1

Internally integrated TCP/IP stack.

LTE Modem encapsulates PPP dial-up protocol and TCP/IP protocol stack and has an embedded operating system. From a hardware perspective, it can be seen as a combination of an embedded PC and a wireless modem. Dial-up Internet access and TCP/IP data communication.

Support automatic heartbeat, always online.

One of the advantages of the 4G communication network is to support the permanent online of the terminal equipment, so the typical Lte Modem is designed to support the permanent online function. This requires the Lte Modem to include a power-on auto-dial and a heartbeat packet to keep it permanently online (when there is no data for a long time).

Provide bidirectional conversion of serial data.

LTE Modem provides serial communication interfaces, including RS232, RS485, RS422, and other commonly used serial communication methods. Most of the designs of Lte Modem convert serial data into a "transparent conversion" method, that is, Lte Modem can communicate with the original data without changing the content of the original data. The original data of the serial port is converted into TCP/IP data packets for transmission. Therefore, the Lte Modem can be connected to various user devices using serial communication without modifying the user devices.

During the communication, the mobile gateway will disconnect the Lte Modem from the center. Heartbeat packets are small packets sent by LTE modems and data centers before they are disconnected to prevent disconnection. Support automatic reconnection and automatic disconnection, redial and other functions.

Support parameter configuration and permanent storage.

As a kind of communication equipment, LTE Modem has a wide range of applications. In different applications, the IP address, port number and baud rate of the serial port in the data center are different. This feature allows the Lte Modem terminal device to support parameter configuration, and the configured parameters can be stored permanently, mainly in the internal permanent storage device, such as the common FLASH or EEPROM. After the user turns on the system, the LTE Modem will work automatically according to the set parameters.

Most Lte modems are connected to industrial equipment, such as PLC, SCM, and other automation products, and then establish a wireless communication connection with the background. All kinds of Lte Modem products have been widely used in power meter reading, water meter reading, heating network monitoring, gas monitoring, water conservancy monitoring, environmental protection testing, meteorological testing, earthquake monitoring, traffic management, and other industries.

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