Siemens Sinumerik 840D sl Function Manual page 190

DNC Plant/DNC Cell (FBDN1)
10 Configuration

Trailer size
The trailer size is specified in bytes. It indicates the number of trailer characters
to be deleted after the data has been received.
Extract from machine configuration file:
TrailerSize=6

First valid character
This is the first valid character of the NC program as an ASCII character in
decimal code (0 ...255) (example: 086 for V). The search is performed in the
header. All characters that appear in front of the first valid character are
truncated.
Extract from machine configuration file:
ValidData=86

Start-of-program character
Start-of-program character specified as an ASCII character in decimal code
(0 ...255) (example: 083 for S). It is inserted at the start of the file before each
NC program is received.
Extract from machine configuration file:
ProgramStart=83

End-of-program character
End-of-program character specified as an ASCII character in decimal code
(0 ...255) (example: 069 for E). It is added at the end of the file before each NC
program is received.
Extract from machine configuration file:
ProgramEnd=69

End-of-transmission character
End-of-transmission character specified as an ASCII character in decimal code
(0 ...255) (example: 4 for EOT). Reception is terminated when this character
has been received. The end-of-transmission character itself is cut off.
When EOFChar=0, the system does not monitor for an end-of-transmission
character; reception is terminated by means of a timeout.
Extract from machine configuration file:
EOFChar=4
Note
If the machine does not transmit an EOFChar, the upload procedure is terminated
in accordance with the configured receive end after the final character (timeout).
FBDN1/10-182
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Motion Control Information System DNC (FBDN) - 04/10 Edition
05.07