HEIDENHAIN TNC 407 (243 020) Technical Manual - Manual (Page 681)

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TNC 407/TNC 415/TNC 425 2 TNC data interfaces 01.98
Read-in all files
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>
.
.
.
.
.
.
.
.
.
..
.
..
.
..
.
If several programs are gathered together in a file which ends with <ETX> then these programs are
read in without being requested by <DC1>.
The request <DC1> is not sent until a program has ended with <ETX>.