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Terminal Control
Break
Pressing the
n
key serves as a ttbreak" signal to interrupt computer operation.
Bell
The terminal contains an embedded speaker for sounding an audible tone in response to the
ASCII
Bell
control code and for alerting the terminal operator when certain error conditions
occur.
From the keyboard, you generate the Bell code by simultaneously pressing the •
and
EI
keys.
From a program executing in a host computer, you trigger the bell tone by transmitting an
ASCII
Bell
control code (decimal 7).
Wait
From a user key or from a program executing in a host computer, you can cause the terminal
to pause for approximately 1 second using the following escape sequence:
Ec 8
Multiple uses of this escape sequence in succession can be used to obtain virtually any
desired time delay.
Note that while an
Ec
8
is in effect, the cursor disappears from the screen, the keyboard is
locked, and the passing of data from the datacomm firmware to display memory is inhibited.
For example, if you want to sound the bell tone twice in succession with a two-second delay
between tones, you could do so using the following control sequence:
<BELL> Ec 8 Ec
@
<BELL>
Modem Disconnect
You can direct the terminal to CChang up" the modem by sending an
Ec f.
The terminal
accomplishes the modem disconnect by lowering the
TRlCD
(Terminal Ready) line for 2
seconds.
2-20
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