HEIDENHAIN TNC 335 Technical Manual - Manual (Page 540)

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TNC 360 3 Standard Data Transmission Protocol 8-33
3.1.5 Reading in all programs
If both the peripheral unit and the TNC have been started, the following protocol is followed:
Peripheral unit
<NUL>
1st line of file 1 <CR> <LF
Last line of file 1 <CR
<NUL>
1st line of file 2 <CR
Last line of file 2 <CR
1st line of last file <CR
<NUL>
Last line of last file <CR> <L
Transmission path
<DC1>
TNC
<EOT>
<DC1>
<DC1>
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.
.
.
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.
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If several programs are gathered together in a file which ends with <ETX> then these programs are
read in without being requested by <DC1>.
Data read-in does not stop until a program has ended with <ETX>.