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This standard applies to the interconnection of data terminal equipment and numerical control equipment at the tape reader interface. The data terminal would typically be connected to a remote data source/sink such as a computer. This standard defines: This standard is applicable for the interchange of signals when used in conjunction with electronic equipment, each interchange circuit of which has a single return (signal ground) that can be interconnected at the interface point. Figure 1.1, typical installation, shows how this standard should be applied to a typical tape reader interface of numerical control equipment.

This standard covers both active and passive aspects of the electrical interface between the Numerical Control (NC) and the machine power and logic control, motor drive equipment, and other electrical apparatus on or associated with the machine tool. It covers: