Kantronics KPC-2 - Page 14

Cable Wiring
A
cable
is
provided
with
nine
prewired
lines
for
the
connector.
You
must
provide
the
connector
to
attach
these
lines
to
your
computer
serial
port.
In
most
cases,
unless
the
terminal
program
you
use
requires
hardware
flow
control,
you
need
only
connect
three
of
these
lines
-
Transmit
Data,
Receive
Data
and
Signal
Ground.
For
hardware
flow
control,
also
called
RTS/CTS
handshaking,
five
wires
are
required.
Since
there
are
so
many
computers
on
the
market,
it
is
impossible
to
provide
interfacing
information
on
all
of
them.
The
following
chart
shows
what
pins
are
used
in
the
TNC
by
name
and
number,
and
the
corresponding
pin
to
connect
to
for
the
most
commonly
used
computer
connectors.
As
a
general
rule,
if
you
have
a
computer
not
covered
here
that
has
a
serial
data
port,
wire
pins
of
the
same
name
together.
Limited
information
on
some
of
the
other
common
computers
will
follow.
Transmit
Data
(TXD),
Receive
Data
(RXD)
and
Signal
Ground
(SG)
must
always
be
wired
in
order
for
the
TNC
and
the
computer
to
exchange
any
data.
Many
terminal
programs
also
require
the
use
of
hardware
flow
control
from
the
TNC.
For
hardware
flow
control
Request
To
Send
(RTS)
and
Clear
To
Send
(CTS)
must
also
be
wired.
Check
the
documentation
to
your
terminal
program
to
see
if
any
other
wires
are
required.
DO
NOT
CONNECT
ALL
25
WIRES.
Some
programs
want
to
see
Data
Set
Ready
(DSR)
to
know
that
the
TNC
is
there
before
operating.
If
this
is
the
case
wire
both
DSR
and
Data
Terminal
Ready
(DTR).
Or
sometimes
you
can
satisfy
the
program's
needs
by
jumpering
these
two
pins
at
the
computer
end
of
the
cable.
Data
Carrier
Detect
(DCD)
is
needed
by
some
BBS
software
to
know
that
a
connection
has
taken
place.
This
would
require
wiring
DCD.
Some
phone
modem
programs
also
want
to
see
a
connection
before
allowing
you
to
even
talk
to
the
TNC.
This
case
can
usually
be
solved
by
jumpering
DCD
to
DTR
at
the
computer
end
of
the
cable.
If
your
computer
requires
DSR
and
also
DCD,
it
is
perfectly
a
E
io
poa
ری󰾯
all
three
pins
(DTR,
DSR,
and
DCD)
together
on
the
computer
end of the cable.
The
TNC
is
wired
as
DCE
(Data
Communication
Equipment).
DCE
equipment
always
sends
its
data
on
the
RXD
wire.
DTE
(Data
Terminal
Equipment)
talks
on
TXD.
This
means
that
if
a
computer
is
wired
internally
as
DCE
and
attached
to
the
TNC
it
will
need
to
have
TXD
from
the
computer
wired
to
RXD
on
the
TNC,
and
RXD
from
the
computer
wired
to
TXD
of
the
TNC.
Otherwise
they
will
both
be
talking
on
the
same
wire
and
never
hear
what
is
said.
If
properly
implemented
by
the
DCE
computer,
ا󰾯
flow
control
may
be
used
by
connecting
RTS
from
each
device
to
CTS
on
the
other
device.
Caution:
Make
sure
the
power
to
the
transceivers,
computer,
and
TNC
is
OFF
before
connecting
any
cables.
©
Copyright
1989,
1991,
Kantronics,
Inc.
All
Rights
Reserved.
Kuere
iud
Secr
12,
1991
Duplication
of
this
manual
or
the
firmware
without
5
10
ua
permission
of
Kantronics,
Inc.
is
prohibited.