The data transfer of usb used in this paper conquers some disadvantages , such as low speed , complex of connecting and so on , providing a new pattern interface for the data transfer of plotter 本论文采用的usb这种传输方式,克服了以往绘图机利用并行电缆带来地低速、迮线复杂等种种缺点,为绘图机的数据传输提供了一种崭新的新型接口。