点动控制是数控系统手工调节过程中不可缺少的一个重要功能，而点动过程则需要自动升降速。
As an important function of a numerical control (nc) system, pointing control is indispensable during manual adjusting process.
本文介绍了以TMS320 LF 2407a为核心控制器的步进电机自动升降速控制系统与PC机的通讯及程序设计方法。
It's introduced that the controlling system in raising and reducing speed of stepper motor that is based on core controller, TMS320LF2407A, communicates with PC, as well as the method of programming.
微机控制、变频调速、触摸面板、可编程操作、具有RCF自动计算与设定、0至9档升降速可调。
Control of microcomputer, frequency control of motor speed, touching panel, programmable operation with RCF automatic computing and setting, adjustable rise-and-fall speed from grade 0 to 9.
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