GPRS DTU is a wireless data terminal for the Internet of Things

GPRS DTU is a wireless data terminal for the Internet of Things

　　 The main function of DTU is to wirelessly transmit data from remote devices back to the back-end center. To complete data transmission, a complete data transmission system needs to be established. GPRS DTU is a wireless data terminal for the Internet of Things, which uses the public operator's network GPRS network (also known as G network) to provide users with wireless long-distance data transmission functions.

Adopt high-performance industrial-grade 8/16/32-bit communication processor and industrial-grade wireless module, with embedded real-time operating system as the software support platform, and provide RS232 and RS485 (or RS422) interfaces, which can be directly connected to serial devices to achieve Data transparent transmission function. Therefore, when the GPRS system is built on the basis of the GSM system, most of the components in the GSM system do not need to be modified in hardware, but only need to be upgraded in software.

　　GPRS DTU initiates a TCP or UDP communication request to the data center through the data center's IP address (if the center domain name is used, the center IP address is resolved through the center domain name first) and port number and other parameters. After receiving the response from the center, the GPRS DTU considers that the handshake with the center is successful, and then keeps the communication connection in existence. If the communication connection is interrupted, the GPRS DTU will immediately re-handshake with the center.

　　 Since the TCP/UDP communication connection has been established, two-way data communication can be carried out.

 　　 For DTU, as long as the two-way communication with the data center is established, it is relatively simple to complete the conversion of user serial port data and GPRS network data packets. Once the user's serial port data is received, DTU immediately encapsulates the serial port data in a TCP/UDP packet and sends it to the data center. Conversely, when DTU receives a TCP/UDP packet from the data center, it takes out the data content from it, and immediately sends it to the user device through the serial port. Through the wired data acquisition center, two-way communication with many GPRS DTUs is carried out at the same time.