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In view of Considering the situation that recently the low rate and poor reliability of synchronous serial communication, we designed a protocol converter based on ARM processor and exchange chip to complete the conversion from synchronous serial protocol to the network communication protocol. The design uses the S3C2440 as the core processor and take the form of the socket to convert SPI protocol to TCP protocol through the way of that server and client establish connection. This article access to the Ethernet USES the network debugging assistants and serial debugging assistant for the client and server communication protocol conversion for testing and analysis. The experimental results show that the data from the server through the SPI bus after the packet structure to forward the message on the Internet, through the exchange of chip port forwarding to the client to complete the SPI to TCP protocol conversion.