The conversion data is available via a serial or parallel interface.
转换数据可通过串行或并行接口获得。
Because PC has only one parallel interface, it can directly control only one stepping motor.
由于微机的并行口只有一个，只能直接控制一台步进电机。
Because PC has only one parallel interface, it can directly control only one stepping motor.
由于微机的并行口只有一个，只能直接控制一台步进电机。
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