In the field of data transmission,UART is widely used as a reliable transmission protocol,but its communication interface RS422 has been gradually eliminated by PC.Aiming at this subject,the conversion and transmission from RS422 to Ethernet are designed and realized.The design takes FPGA as the control core to realize the on-chip integration of RS422 and Ethernet conversion.In the hardware design,ADM2682EBRIZ and 88E1111 are used as the physical layer of RS422 and Ethernet respectively.In terms of software design,the design of UART,UDP,IP,ARP and MAC modules are completed by writing hardware description language and using IP core,the data in the memory is cached into FIFO through UART,and the frame encapsulation of datagram is completed by Ethernet modules under UDP/IP protocol,and then the data packet is uploaded to the host computer software of ground integrated measurement and control platform through physical layer,network transformer and RJ45 crystal head.Through the simulation experiment and the data processing verification of the host computer,the design can complete the conversion and transmission from RS422 to Ethernet, and the frame loss rate is 0 after the data is read back and analyzed.
Key words
UART /
ADM2682EBRIZ /
88E111 /
UDP/IP /
FPGA /
ARP
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