HEIDENHAIN TNC 306 Technical Manual - Manual (Page 444)

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TNC 406/TNC 306 3 Standard data transmission protocol 8-31
Peripheral unit Transmission path
<EOT>
<DC1>
<NUL> <NUL> <NUL>
1st line of file <CR> <LF>
TNC
.
.
.
Last line of file <CR> <LF> <ETX>
.
.
.
In this transfer method, the TNC can stop transmission with <DC3> and continue it with <DC1>.
If the file name in the first line of the file and the name indicated in the TNC are not identical, the
TNC reads each block in and searches for the file name concerned.
If the END PGM-block has been read in, and the selected name is not known, the TNC remains
static without an error message, and transfer must be terminated with the END key.
Example: Reading in program 100.H.
Peripheral unit
1st line PGM100 <CR> <LF>
Last line PGM 100 <CR> <LF> <ETX>
Transmission path
<EOT>
<DC1>
TNC
.
.
.
.
.
.
100.H "START"
<NUL> <NUL>
In this case, if the last PGM block ends without the <ETX> character then transfer is terminated
without an error message but the data is not stored. This means that the program was stored on
the data medium with an incorrect program name (PGM NAME
≠ file name).