| 摘要 |
A system for multiplexing USB (Universal Serial Bus) interface transmission data is provided, including a terminal, a data transmission line, an electronic signature tool, a safety chip and a gating circuit. A first USB interface is arranged at one end of the data transmission line and an interface adapting to connect the terminal is arranged at the other end, for transmitting information sent by the terminal directly. The electronic signature tool has a second USB interface connected to the first USB interface, for receiving the information sent by the terminal. The safety chip is connected to the second USB interface, for detecting information received by the second USB interface and judging a used data transmission protocol type according to the detected information, and creating control information according to the data transmission protocol type. A demodulating manner matched with the data transmission protocol type is adopted to demodulate the received information to obtain the demodulated data. The gating circuit connects to the second USB interface and the safety chip, receives control information sent by a control end of the safety chip and is communicated with a modulating and demodulating end supporting the data transmission protocol in the USB interface and the safety chip according to the control information. |
