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Appendix
A
The
abort
character allows the
Modem
to
be
disconnected
under
soft-
ware
control.
To program
this
symbol,
press
©
.
The
next key the
Modem
receives
will
be
stored as the
abort
character.
For example,
to
change
the abort
code from
CTRL
T
to
CTRL R
after
doing a
list
command,
you would
type:
©CTRL
R
CTRL R
would be
listed
as
ABORT
CHAR:12H
(in
HEX).
When
you
enter the
ASCII
character,
it
will
not
be echoed
on
the
screen.
Only
@
will
be
echoed, provided the
echo
switch
is
not
disabled.
The
DCM
212
will
watch
for transmitter
activity for 3
seconds
after
the
abort
code
is
sent. If
there
is
no
activity
during
that
3-second
peri-
od, the
computer
will
abort
any
ON-LINE
activity in
progress. If there
is
keyboard
activity
within
that
3-second
period, the
DCM
212
will ig-
nore
the abort
command.
G,
g
Forced
carrier
detect toggle
This
toggling
command
controls the
carrier detect signal
applied
to
the
computer
or the
terminal.
When
freshly
powered
on, the
DCM
212
is
commanded
to force
a
carrier signal
to
your computer.
If
your
com-
puter
does not
need an
asserted
carrier
to
output
RS-232C
data,
you
can
turn the
carrier
OFF
by
pressing
(G)
.
You
can
see
the action
of
the
G
command
in
two
ways.
First,
watch
the
Modem's
front
panel
CD
indicator
go
OFF
and
ON
each time
you
press
(G)
.
Next,
check
the
parameter
listing
for reply line
FORCE
CARDET
by using
the
L
command
to bring the
list
to the screen.
Note:
The
G
command
is
effective
only
when
the
DIP
SW3
is
OFF.
E, e
Echo
disable/enable toggle
The
E
command
toggle allows
you
to defeat
or
disable the
Modem's
echo
and
list
ability.
Normally
defaulted on, the
DCM
212 echoes
dis-
playable characters
and
generates a
listing
when
the
L
command
is
received.
After
receiving the
E
command,
the
Modem
will
not echo
nor
print
out
its
status in
response
to
the
L
command.
53
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