HEIDENHAIN TNC 306 Technical Manual - Manual (Page 445)

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TNC 406/TNC 306 3 Standard data transmission protocol 3/97
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> <NUL>
1st line of file 1 <CR> <LF>
Last line of file 1 <CR> <LF>
<NUL> <NUL>
1st line of file 2 <CR> <LF>
Last line of file 2 <CR> <LF>
1st line of last file <CR> <LF>
<NUL> <NUL>
Last line of last file <CR> <LF> <ETX>
Transmission path
<DC1>
TNC
<EOT>
<DC1>
<DC1>
<DC1>
.
.
.
.
.
.
.
.
.
<ETX>
...
...
...
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>.