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6 reading in an offered program – HEIDENHAIN TNC 335 Technical Manual User Manual

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4 Data transfer with BCC

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4.1.6 Reading in an offered program

In this mode, the TNC first of all sends a header without a program name. The peripheral unit then
starts data transfer, until it is stopped by the TNC. The TNC interrupts transfer by not sending a
positive acknowledgment (no ) and awaits acknowledgment.

If a positive acknowledgment is given, then the program is read in. Otherwise a header is
immediately sent again.