Lte Modem means the data transmission unit, that is, the data transmitter, and the 4G Lte Modem is the 4G version of the data transmitter. The 4G version of the Lte Modem has a history of many years, and there are not only 4G versions of Lte Modems, but also Wi-Fi versions and Ethernet versions.

First of all, we need to understand what 4G Lte Modem can do and how many possibilities it can expand.

First, 4G Lte Modem can be used as a pure tool communication middleware to directly help you realize the data transmission process. For example, if you want to send a message to the Aliyun server, but you don't have a convenient and mobile device that can communicate with the server. Then the 4G Lte Modem can directly help you interact with the server.You only need to configure the Lte Modem, set the server address and port (if it is MQTT protocol, configure the triplet parameters, etc., and configure different things according to different protocols), then the Lte Modem will automatically connect to the server, and you can send messages directly to Lte Modem through RS485. The Lte Modem forwards the information to the server.Similarly, the Lte Modem will directly output the information sent by the server through RS485.

Secondly, the 4G Lte Modem can be used as a communicator of ModBus devices. For example, after the Lte Modem is configured to access your own server, the server can directly issue ModBus instructions, and the Lte Modem will directly transmit the instructions through RS485. The RS485 of Lte Modem is directly connected to the lower ModBus slave device.The ModBus device slave can act according to the ModBus command issued by the server or respond to the query command, and the reply command of the ModBus slave will also be returned to the server through the 4G Lte Modem.

It also expands its 4G Lte Modem, ModBus Edge Gateway, which is also a 4G Lte Modem, but it has its own DO/DI/AI acquisition and control functions, the server can directly control the end equipment by issuing instructions, and it has the same functions as the ordinary 4G Lte modem. As a ModBus edge gateway, it can manage ModBus edge devices in batches.For example, if there are four devices A, B, C and D, they are all mounted to the 4G Lte Modem. After the configuration is completed, the 4G Lte Modem will always collect the information of the edge devices and save it internally.The periodic reporting state or the change reporting state can be set, the information can be uploaded to the server through 4G after the collected data changes, or the information can be periodically reported to the server, not only that, the reported information is also sorted out, and the data read out by the ModBus protocol is translated into JSON format and directly uploaded to the server.In this way, the process of analyzing the information by the server is omitted, and the user is convenient to supervise the equipment intuitively.

As an important branch of PUSR data transmission equipment, 4G Lte Modem plays an important role in wireless transmission. For users, there is no need to worry about the problem of data transmission, and the function expansion of 4G Lte Modem can be easily applied to industrial production environment, such as the control of industrial application air switch. The server uses a 4G Lte Modem as a medium,Control the air switch to act and so on.