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This standard establishes the performance requirements for the control of the electromagnetic emission and susceptibility characteristics of electronic, electrical, and electromechanical equipment and subsystems designed or procured for use in severe electromagnetic environments such as ships, aircraft, spacecraft, armored vehicles, etc. Such equipment and subsystems may be used independently or as an integral part of other subsystems or systems.

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 for Numerical Machine Control Perforated Tape is intended to serve as a guide in the coordination of equipment design, to minimize the number of sizes and codes of perforated tape used, and to minimize the variety of perforated tape preparation equipment required by users of numerically controlled machines.