在分布式处理控制执行程序(DPCX)中，应用程序和终端之间的通信的一种方式，通信期间操作员可以不管预定的格式或字段而输入数据。
In DPCX, communication between an application program and a terminal during which the operator enters data without regard for any predefined form or field.
173平移台具有两个限制传感器用于行程和定位终端。
MLA-173 translation stages have two limit sensors for end of travel and referencing.
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