IBM 3164 ASCII Manual page 100

OLE
sequence
The following data link escape (D LE) sequences are available in order to
control the display station:
•
DLE.EDT
Mandatory disconnect
•
DLE.STX Enter transparent mode
•
DLE.ETX Exit transparent mode
•
DLE.DC2 Begin passthrough data stream
•
DLE.DC4 Terminate passthrough data stream.
These sequences may be generated from the host system or from the
keyboard. If transparent mode is inhibited, the DLE.STX sequence from the
keyboard causes the audible alarm to sound.
The 'mandatory disconnect' (DLE.EDT) sequence is used only on a switched
communication network to initiate a disconnect. This sequence causes the
display station and the host system to terminate and disconnect. When the
display station receives or generates the DLE.EDT sequence, the following
functions are performed.
1. The DTR signal is turned off.
2. The display station waits for 500 milliseconds.
3. The DTR signal is turned on again.
When the 'enter transparent mode' (DLE.STX) sequence is received, the
display station enters the transparent mode, where all ASCII characters
including control codes are displayed as symbols in the viewport.
The DLE character is displayed only if the operator presses the DLE key twice
or if the host program sends two successive DLE characters to the display
station.
When the 'exit transparent mode' (DLE.ETX) sequence is received, the display
station exits transparent mode and all ASCII control characters disappear from
the viewport.
The 'begin passthrough data stream' (DLE.DC2) sequence is used to indicate
the beginning of a passthrough data stream.
The 'terminate passthrough data stream' (DLE.DC4) is used to terminate the
passthrough data stream.
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