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7.6 Configuring the Serial Interface
523
7.6 Configuring the Serial Interface
7.6.1 Control Characters
Overview of control characters specific to HEIDENHAIN
Character
Designation
Description
SOH
Start of Header
Identifies the beginning of the data
transfer header. The character string
contains the program number and
information about the type of pro-
gram and the transfer mode.
STX
Start of Text
Identifies the beginning of a program
block.
ETB
End of Text Block
Terminates a data transfer block.
The character that follows (BCC) is
used for data checking.
DC1
XON
Starts the transfer of data.
DC3
XOFF
Stops the transfer of data.
ETX
End of Text
Transmitted at the end of a program.
EOT
End of Transmission
Terminates the data transfer and
establishes the idle state. This cha-
racter is transmitted by the control at
the end of a program input and to
the external device in the event of an
error.
ACK
Acknowledgment
Transmitted by the receiver when a
data block has been transferred wit-
hout error.
NAK
Negative Acknowledg-
ment
Transmitted by the receiver when a
data block has been transferred with
an error. The transmitter must re-
transmit the data block.
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