Basic Features of 4G LTE modem

The functions of 4G LTE modem and features of the 4G LTE modem introduction are as follows:

In recent years, the usage rate of 4G LTE modems is gradually increasing, and it covers a wide range of fields. Its main function is to transmit data to the cloud completely and transparently.

4G LTE modem is a communication device specially used to transmit serial port data to the cloud (or vice versa) and transmit it through a wireless communication network.

The 4G LTE modem can also be called a 4G data transmission module and a 4G transmission terminal, supports transparent data transmission of 2G/3G/4G and other network signals, supports RS232/RS485 and other interfaces, and the lower computer (sensor, PLC, etc.) is connected to the 4G LTE modem for wireless remote transmission.

The 4G LTE modem has the characteristics of stable and real-time data transmission and has a hardware and software dual watchdog system so that it has sufficient stability.

8 basic features of 4G LTE modem:

1. Network connection mode: 3 frequency bands (support 2G network, 3G network, and 4G network).

Fig.1

2. Data transmission mode: 2 data transmission modes (conforming to the configuration software protocol and supporting transparent data transmission).

3. Data transmission protocol: 4 data transmission protocols (supporting AT command protocol, MQTT protocol, UDP protocol, and TCP protocol control).

4. Data control center: Type 3 control center (support fixed IP address access, support dynamic domain name access, and support multi-backup data center access).

5. Automatic storage: The 4G LTE modem can automatically store the cached information data to ensure that the user's information data is not easily lost.

6. Functional diversification: The 4G LTE modem can make phone calls, send text messages, and surf the Internet at the same time. It also supports a wide range of remote wake-up calls, such as serial data connection transmission.

7. Easy to manage: The 4G LTE modem can be remotely controlled, queried, and configured by sending and receiving short messages.

8. easy to maintain: can provide firmware local upgrade service function.

The 4 core functions of 4G LTE modem:

1. Embed TCP/IP protocol stack

4G LTE modem. With 3p dialing protocol, TCP/IP protocol stack, and embedded operating system.

In terms of hardware, it can be seen as the integration of wireless 4G MODEM and embedded PC.

Therefore, the 4G LTE modem can not only make phone calls and surf the Internet but also realize the mutual transmission of TCP/IP data.

2. Serial port data bidirectional conversion

There are many serial communication interfaces (RS422, RS485, RS232) supported by 4G LTE modems.

However, in general, the most commonly used serial port data transmission mode for 4G LTE modems is:

Transparent mode. Only in this condition and environment, can make the serial port information data through TCP/IP data packets to achieve the mutual conversion of data and receive a transmission, so that the efficiency is higher, and faster transmission efficiency.

This also enables the 4G LTE modem to be connected to each serial port and realize direct data conversion and transmission communication, and an efficient working mode that can be directly used without extra steps. Make data transmission simple and efficient, and make data transmission more unified management.

3. Automatic heartbeat, permanently online

The 4G LTE modem technology itself has the function of permanent online, which can support the permanent online of the 4G terminal equipment. Based on this feature, the 4G LTE modem can automatically dial to the superior terminal. And keep the heartbeat packet of the 4G LTE modem permanently online (if the 4G LTE modem device has not performed data communication for a long time, the superior terminal network will be disconnected from the 4G LTE modem. This is the heartbeat packet, which will automatically send a data packet to contact the superior terminal, and continue to contact the superior terminal to ensure close contact between the two). In addition, the 4G LTE modem equipment adopts the anti-theft and anti-theft "watchdog" technology in both hardware and software. Under this dual protection, if the line is disconnected, it can realize the automatic connection of the line and automatically redial.

4. Parameter configuration, permanent storage

The practical application of 4G LTE modem is very extensive. In different practical applications, the server IP address of the information data center, the baud rate of the serial port parameters, and the port number are different. Therefore, the 4G LTE modem must adapt to more parameter support, adapt to more and better parameters, and store them in the internal FLASH or EEPROM permanent memory device. As soon as it starts working, the 4G LTE modem device will automatically operate according to the adapted parameters.

8 features of 4G LTE modem

I. Hardware:

1. sheet metal shell, stable operation in harsh environment

Industrial sheet metal shell is durable, resistant to high and low temperatures (-20℃ to 85℃), wide voltage (5V-36V); Super moisture-proof, lightning protection, and anti-electromagnetic interference capability, to ensure the stable operation of equipment in harsh environments.

Fig.1

2. Small volume, convenient installation, and simple use

The overall design of the 4G LTE modem is small in size, and the configuration methods are simple and diverse (the tower PUSR provides software configuration tools, serial AT command configuration, remote command configuration sent by the cloud, and SMS configuration).

3. Support multiple interfaces

The 4G LTE modem supports multiple interfaces (RS232/RS485) and is compatible with lower computers with different interfaces, such as PLC, touch screen, sensor, etc.

4. Strong signal and wide coverage

Reasonable circuit design, high gain antenna, good signal strength, and receiving ability;

Wide signal coverage and super through-wall performance ensure that the network signal is in a weak environment to protect data transmission.

II. Software:

1. Support the networks of three major operators (2G, 3G, and 4G)

Wireless transparent transmission, high-speed, smooth; Compatible with a variety of SIM cards including APN card and Internet of Things card, more choices and more convenient operation.

2. efficient transmission, safe and secure

The multi-server sending mechanism is adopted, and the data can be sent to up to four servers at the same time; The data is intuitionistic and is convenient to obtain the data in real-time; Encrypted transmission under the premise of the transmission conditions of the private network fully guarantees the security and accuracy of various data.

3. Disconnection and reconnection, high stability

The 4G LTE modem has a reconnection mechanism, a hardware power-off restart mechanism, and supports a remote restart command;

The TCP heartbeat link detection mechanism is adopted, the connection is disconnected and reconnected, the data is cached and retransmitted, and the transmission is stable without packet loss.

Support serial port AT protocol, switch to AT command state during operation, configure parameters, and restart and control 4G LTE modem equipment; Embedded TCP/IP, UDP/IP, MQTT, HTTP, and other protocols.