January 2012 9.6 Configuring the Serial Interface 1771
9.6 Configuring the Serial Interface
9.6.1 Control characters
Overview of control characters specific to HEIDENHAIN
Character Description 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
program 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
character 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
without error.
NAK Negative
Acknowledgment
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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