HEIDENHAIN TNC 306 Technical Manual - Manual (Page 450)

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TNC 406/TNC 306 4 Data transfer with BCC 8-37
4.1.4 Reading in a selected program
If a file is to be read in from an external memory, the TNC sends a header with the file name
concerned, whereupon the peripheral sends the file.
Peripheral unit
<ACK>
.
.
.
<ETX>
<SOH> <N> Name <E> <ETB>
Transmission path TNC
<ACK>
<EOT>
<ACK>
.
.
.
<STX> 1st line of file <ETB> BCC <DC1>
<STX> Last line of file <ETB> BCC <DC1>
BCC <DC1>