When a tape volume is opened for input or output using NL or BLP processing, the operator is requested by the CA 1 message IECTMS1 to supply the volume serial number. This allows the data set to be cataloged to the operating system or accessed from the TMC. For a specific input or output volume request, the volume serial number must be the same as specified in the JCL or cataloged to the operating system. If not, CA 1 assumes the wrong tape volume is mounted and has the tape demounted. For a nonspecific output request, the same volume serial number must be entered twice consecutively, which makes sure the operator has not accidentally hit the wrong key.
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