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
passingof
data
from
the
datacommfirmware 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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