Kantronics KPC-4 - Page 11

)
Full
Duplex
or
Half
Duplex.
(Some
programs
use
the
term
Echo
for
Half
Duplex.)
When
using
Full
Duplex
the
computer
expects
the
attached
device
to
send
back
(echo)
what
was
sent
to
it.
A
setting
of
Half
Duplex
will
tell
the
program
that
it
must
do
the
displaying
to
the
screen
for
what
you
type.
The
TNC's
default
is
ECHO
ON
which
tells
the
TNC
to
send
back
what
it
receives.
This
corresponds
to
a
setting
of
Full
Duplex
for
the
computer.
If
you
set
your
computer
for
Half
Duplex
you
will
need
to
turn
ECHO
OFF
or
you
will
see
two
of
everything
you
type.
When
using
a
split-screen
program
you
may
want
to
set
ECHO
OFF
in
the
TNC
because
the
program
will
be
handling
what
you
type
in
the
buffered
keyboard
screen.
Flow
Control.
Often
times
one
device
may
talk
to
another
device
faster
than
it
can
handle
the
information.
When
this
happens
the
excess
information
is
stored
in
a
buffer
until
it
can
be
processed.
This
buffer
is
only
so
large.
If
the
data
were
to
over-flow
the
buffer
it
would
be
lost.
Flow
Control
is
the
terminology
used
for
how
the
devices
inform
each
other
to
stop
or
start
sending
data.
There
are
two
ways
to
accomplish
this,
software
and
hardware.
The
TNC's
default
XFLOW
ON
allows
the
TNC
to
implement
software
flow
control
(hardware
flow
control
is
always
recognized
by
the
TNC).
Software
Flow
Control
is
implemented
by
the
program
or
TNC
looking
at
the
data
and
watching
for
two
certain
characters.
One
of
these
characters
(normally
Ctrl-S)
tells
the
device
to
stop
sending
data
and
the
other
(normally
Ctrl-Q)
tells
the
device
to
re-start
sending
data.
The
TNC
commands
XOFF
and
XON
tell
the
TNC
which
characters
to
send
to
the
computer
to
stop
and
start
data
flow.
The
commands
STOP
and
START
define
which
characters
the
TNC
expects
from
the
computer.
These
commands
all
come
defaulted
for
normal
software
flow
control.
Hardware Flow Control is implemented by the devices watching the voltages on the
RTS and CTS pins of the RS-232 port. The TNC will always monitor these pins so only
connect them if you are going to use them. If you use hardware flow control, you should
turn XFLOW OFF. See the Connecting Your Computer section of the Installation
Manual for how to wire your RS-232 cable for hardware flow control.
PERM. If you would like to customize the defaults in the TNC for your situation, all
you have to do is type PERM at the cmd: prompt (followed by a RETURN or ENTER
key) This command will write your customized defaults to the EEPROM. Now if you
turn the TNC off and back on again your defaults will be used. This command can be
used at least 1000 times, so as you experiment with your parameters and find ones you
would like to have different than factory default, just use this command. If for any
reason you ever want to go back to the factory defaults a Hard Reset can be performed
(see the Hard Reset section of the Installation Manual), or use the RESTORE D
command as described in the Commands Manual.
Dual-Port Set-Up Commands
PORT. The KAM and KPC-4 both have two radio ports. When turned on the KAM will
be addressing the VHF port and the KPC-4 will address Port 1. If you wish, this may
be changed so that the other port will be addressed when the unit is turned on. For the
KAM you could type PORT HF at the cmd: prompt and for the KPC-4 you would type
PORT 2. This command would then need to be PERMed (if not using Battery Backup
or SmartWatch). This only affects what port the TNC will address when it is turned
on or after the next soft reset. In order to change ports during packet operations see
Multi-Connects in the Packet section or the STREAMSW command in the Commands
Manual. When using non-packet modes on the KAM the HF port is automatically
selected. In order to enter a non-packet mode, the MAXUSERS command must be set
to allow HF operation.
INTRO 5
© Copyright 1989, 1990, Kantronics, Inc. All Rights Reserved. A
Duplication of this manual or the firmware without Aug. 13, 1990 p Version 3.0
permission of Kantronics, Inc. is prohibited. Operations Manual