Kantronics KPC-4 - Page 48

ASCII
is
an
8
bit
code,
allowing
256
possible
combinations,
and
thus
overcomes
the
shortcomings
of
RTTY
concerning
numbers
and
punctuation.
Because
all
possible
numbers,
letters, and punctuation
can
be
defined
within
this
set
of
combinations,
no
LETTERS
or
FIGURES
shift
is
required.
Transmission
of
ASCII
is
accomplished
using
FSK
or
AFSK
as
is
done
in
Baudot
RTTY,
and
many
of
the
operational
practices
have
been
carried
forward
from
RTTY
to ASCII.
RTTY and ASCII Operation
RTTY
and
ASCII
operation
with
the
KAM
is
accomplished
through
the
HF
radio
port.
Several
commands
and
special
directives
are
used
to
control
the
operation
of
the
KAM
in
RTTY
or
ASCII
operation.
The
following
commands
(from
the
CMD:
prompt)
will
set
the
defaults
for
RTTY
and
ASCII
operation:
ASCBaud
AUtocr
AUTOStrt
Coe
CRAdd
DIDdle
Echo
FSKinv
INvert
LCRtty
LOwtones
MYAUtost
RBaud
USOs
XMitecho
Entering the RTTY Mode from the Command Mode is accomplished by typing RTTY in
response to the cmd: prompt. This will place the KAM in RTTY operation at the baud
rate specified by RBAUD (default 45) and the display would show the message:
-RTTY 45-
To enter RTTY at another baud rate, you would use the command RTTY n where nis
the desired baud rate.
To enter the ASCII Mode, the same procedure is followed as for RTTY operation, except
that the default baud rate is specified by the ASCBAUD setting and you type ASCII at
the cmd: prompt setting. The display shows:
-ASCII 110-
Once you have entered the RTTY or ASCII Mode of operation, several directives are
activated, allowing operation in the selected mode. These directives and their use are:
Ctrl-L Send LETTERS shift character in RTTY Mode
Ctrl-N Send FIGURES shift character in RTTY Mode
Ctrl-C S Change shift (170, 425, 850 or MODEM)
Ctrl-CI Invert mark and space signals received from radio
Ctrl-C T Enter transmit mode
Ctrl-C E Enter receive mode when transmit buffer is empty
Ctrl-C R Enter receive mode immediately
40 RTTY/ASCII
: © Copyright 1989, 1990, Kantronics, Inc. All Rights Reserved.
Version 3.0 Aug. 13, 1990 Duplication of this manual or the firmware without
Operations Manual permission of Kantronics, Inc. is prohibited.