Kantronics KPC-4 - Page 51

The ECHO command allows the TNC to send any character you enter from the
keyboard back to your terminal. If you are using a split-screen terminal program, your
terminal program may provide this local echo for you, and you will then want to turn
ECHO OFF. This would then allow what you send to appear in your transmit window,
and
the
data
you
receive
would
appear
in
the
receive
window
of
your
terminal.
(See
XMITECHO for more information.)
The
FSKINV
command
(default
OFF)
will
determine
the
polarity
of
the
signals
sent
from
the
KAM
to
the
FSK
input
of
your
transceiver.
In
the
OFF
state,
a
MARK
is
open
collector
(open circuit) and
a
SPACE
is
ground
(closed
circuit).
Since
transceiver
manufacturers
have
not
implemented
a
standard
for
FSK
operation,
it
may
be
necessary
to
invert
your
transmitted
signal
using
this
command.
You
cannot
invert
the
transmitted
signal
once
you
are
in
the
RTTY
or
ASCII
Mode,
but
only
by
the
use
of
this
command
prior
to
entering
either
of
these
modes.
In
order
to
invert
your
transmitted
signal
using
AFSK,
you
will
need
to
use
modem
shift
(see
SHIFT
command
or
Ctrl-C
S
directive)
and
set
your
MARK
and
SPACE
tones
using
the
MARK and
SPACE
command.
If
INVERT
is
OFF,
the
KAM
will
decode
RTTY,
ASCII,
and
AMTOR
signals
as
sent
(i.e.
mark
is
decoded
as
mark,
and
space
is
decoded
as
space).
Most
RTTY
on
the
HF
bands
is
sent
in
lower
sideband,
but
if
your
radio
is
upper
sideband
only,
you
may
want
to
set
the
INVERT
command
ON.
The
decoding
of
the
mark
and
space
signals
may
be
inverted
after
you've
entered
the
RTTY,
ASCII,
or
AMTOR
Mode
by
using
the
invert
directive
(Ctrl-C
I).
(See
FSKINV
for
inverting
signals
that
you
are
transmitting.)
The
LCRTTY
command
can
be
used
to
send
and
receive
lower
case
RTTY.
When
ON,
lower
case
characters
may
be
sent
and
received
in
RTTY
and
AMTOR
Modes
of
operation.
This
is
accomplished
by
using
the
RTTY
NULL
character
as
a
special
shift
character.
This
method
is
also
used
in
RTTY
to
send
the
Russian
Cyrillic
alphabet.
If
USOS
is
ON,
a
received
space
will
shift
to
lower
case.
The
distant
station
will
only
receive
lower
case
characters
if
he
also
has
LORTTY
ON.
The
LOWTONES
command
controls
the
MARK
and
SPACE
frequencies
when
using
the
standard
shifts
of
170,
425,
or
850
Hz.
When
ON,
the
European
low
tones
are
used,
with
MARK
being
1275
Hz,
and
SPACE
being
the
MARK
frequency
plus
the
selected
shift.
When
this
command
is
OFF,
the
standard
RTTY
tones
are
used:
MARK
is
2125
Hz
and
SPACE
is
the
2125
plus
the
selected
shift.
The
RBAUD
command
sets
the
baud
rate
to
be
used
when
entering
the
RTTY
Mode
from
the
cmd:
prompt
with
no
speed
specified.
This
setting
is
also
used
to
set
the
baud
rate
when
the
Ctrl-C
Y
directive
is
issued.
The
USOS
command
(Un-shift
on
Space)
when
ON
will
cause
the
KAM
to
switch
from
figures
to
letters
upon
receiving
a
space
character
from
the
other
end.
If
LCRTTY
is
also
on,
a
received
space
will
switch
to
lower
case
characters.
When
XMITECHO
is
turned
on,
the
KAM
will
echo
the
transmitted
characters
to
your
terminal
at
the
time
they
are
actually
being
transmitted.
This
can
be
useful
for
determining
when
your
transmit
buffer
is
empty,
and
therefore
you
may
return
to
receive
mode.
With
split
screen
programs,
the
echoed
data
will
show
up
in
the
receive
window
as
it
is
echoed
from
the
KAM.
O
Copyright
1989,
Kantronics,
Inc.
All
Rights
Reserved.
s
Duplication
of
this
manual
or
the
firmware
without
Version
2.85
permission
of
Kantronics,
Inc.
is
prohibited.
Operations
Manual