Siemens Sinumerik 840D sl Function Manual page 185

05.07

Header size
The header size is specified in bytes. It describes the number of header
characters to be inserted.
Extract from machine configuration file:
HeaderSize=8

Header character
The header character is inserted as an ASCII character in decimal code
(0 ...255) with the factor header size (example: 072 for H).

Extract from machine configuration file:
HeaderChar=72
Note
In this case, the header is HHHHHHHH

Trailer size
The trailer size is specified in bytes. It describes the number of trailer
characters to be inserted.
Extract from machine configuration file:
TrailerSize=6

Trailer character
The trailer character is inserted as an ASCII character in decimal code
(0 ...255) with the factor trailer size (example: 078 for N)
Extract from machine configuration file:
TrailerChar=78
Note
In this case, the trailer is NNNNNN
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Motion Control Information System DNC (FBDN) - 04/10 Edition
DNC Plant/DNC Cell (FBDN1)
10 Configuration
FBDN1/10-177