Router Data Transfer Unit Core Function

DTU (Data Transfer Unit) is a wireless terminal device specially used to convert serial port data into IP data or convert IP data into serial port data for transmission through a wireless communication network. DTU is widely used in meteorology, hydrology and water conservancy, geology and other industries.

1) Internally integrated TCP/IP protocol stack

GPRS DTU encapsulates the PPP dial-up protocol and TCP/IP protocol stack and has an embedded operating system. From the hardware, it can be regarded as a combination of embedded PC and wireless GPRS MODEM; it has GPRS dial-up Internet access and TCP/IP data The function of communication.

2) Provide two-way conversion function of serial data

GPRS DTU provides serial communication interfaces, including RS232, RS485, RS422, etc., which are commonly used serial communication methods, and most of the GPRS DTU designs serial port data into a "transparent conversion" method, which means that GPRS DTU can Convert the original data on the serial port into TCP/IP data packets for transmission without changing the original data communication content. Therefore, GPRS DTU can be connected with various user equipments that use serial communication, and there is no need to modify the user equipment.

3) Support automatic heartbeat and stay online permanently

One of the advantages of the GPRS communication network is to support GPRS terminal equipment to be permanently online. Therefore, the typical GPRS DTU is designed to support the permanent online function. This requires the DTU to include automatic dialing after power-on, and the use of heartbeat packets to remain permanently online (when a long time When there is no data communication, the mobile gateway will disconnect the DTU from the center. The heartbeat packet means that the DTU and the data center send a small data packet before the connection is disconnected to keep the connection from being disconnected), and support automatic reconnection after disconnection , Automatic redial and other features.

4) Support parameter configuration, permanent storage

As a kind of communication equipment, GPRS DTU has a wide range of applications. In different applications, the IP address and port number of the data center, the baud rate of the serial port, etc. are different. Therefore, GPRS DTU should support parameter configuration, and save the configured parameters in the internal permanent storage device (usually FLASH or EEPROM, etc.). Once powered on, it will automatically work according to the set parameters.

5) Support user serial port parameter setting

The serial port parameters of different user devices are different. When the DTU is connected to the serial port of the user device, the DTU terminal must be set according to the actual parameters of the user device serial port to ensure the normal communication and reliable data transmission of the user device.

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