Kantronics KPC-2 - Page 42

Dumb
Modem
Mode
KPC-1,
KPC-2
and
KPC-2400
Only
The
TNC
can
also
be
used
as
a
straight-through
or
dumb
modem.
In
this
mode
the
TNC
does
not
use
any
of
the
protocols
or
special
characteristics
of
packet
radio.
Instead,
the
TNC
simply
outputs
any
information
sent
through
the
RS-232/TTL
port,
at
up
to
1200
baud.
To
utilize
the
dumb
modem
feature,
you
must
PERM
the
MODEMENA
parameter
ON.
Hold
the
RTS
line
of
the
RS-232
connector
at
a
negative
voltage
when
the
TNC
is
powered
on.
If
the
connector
is
set
to
the
TTL
level
position,
the
RTS
line
must
be
held
at
a
positive
5
volts
when
the
TNC
is
powered
on.
To
operate
in
the
dumb
modem
mode
you
must
utilize
the
RTS
and
CTS
lines.
The
TNC
will
function
as
a
true
RS-232
device,
using
these
lines
to
control
transmit
and
receive
operation.
The
transmit
and
receive
LED
on
the
front
panel
will
be
operational.
This
mode
uses
the
PERMed
parameters
as
specified
by
the
HF,
HFT
and
CCITT
command
and
checks
the
status
of
the
EQUALIZE
parameter.
To
exit
this
mode
you
must
turn
the
TNC
off
and
power
up
with
RTS
free.
D
:
©
Copyright
1989,
Kantronics,
Inc.
All
Rights
Reserved.
Version
2.85
Duplication
of
this
manual
or
the
firmware
without
Installation
Manual
permission
of
Kantronics,
Inc.
is
prohibited.