HEIDENHAIN TNC 335 Technical Manual - Manual (Page 534)

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TNC 360 2 TNC data interfaces 8-27
The ASCII characters for input and output identification can also be freely defined.
MP5010.1 1st ASCII character for data file during data input
2nd ASCII character for input identification (E)
Input range: 0 to 32 382
MP5010.2 1st ASCII character for file type during data output
2nd ASCII character for output identification (A)
Input range: 0 to 32 382
Example: If an ISO program should be output in the EXT mode, then:
MP5010.2 = 68
(or MP5010.2 = 0)