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HP 95LX - 4. Communicating with Other Devices; Making the Connection

HP 95LX
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4.
COMMUNICATING
WITH
OTHER
DEVICES
The
HP
95LX
can
communicate
with
a wide
range
of
devices
via
its
serial
port.
It
can
download
and
upload
information
to
other
PCs
and
to
an
increasing
number
of
compatible
printers,
modems,
and
pagers.
It
can
also
be
terminal
to
networks
and
electronic
services,
such
as
Dow
Jones
and
CompuServe,
or
a
node on
a
local
network
(as
either
client
or
server).
To
use
of
any
of
these
features,
you
need
the
Connectivity
Pack
(HP
part
#
F1001A),
which
includes
software
on
disks
and:
¢
The
serial
cable
with
a
4-pin
end
(for
the
HP
95LX)
and
a
9-pin
end
(for
the
serial
port
on
the
PC).
*
A9-pin
to
25-pin
adapter
in
case
the
PC
serial
port
requires
a
25-pin
connector.
Making
the
Connection
Besides
those
provided
in
the Connectivity
Pack,
you
may
need
other
adapters
to
make
the
proper
connections
a
particular
device.
You
may
need
an
adapter
that
does
one
or
more
of
the
following:
*
Adapts
one
style
and
size
of
connector
to
the
other;
*
Changes
the
gender
of
a
connector
without
changing
pin
configurations;
*
Changes
the
pin
configurations—connecting
receive
and
transmit
lines—
without
changing
the
gender
of
the
connection
(called
a
null
modem
adapter).
The
external
connection
end
of
the
HP
95LX
cable
is
a
female
9-pin
connector
that
uses
pin
2
to
transmit,
pin
3
to
receive
and
pin
5
as
a
ground
(“a
9-pin
female
(2—
3-5)”).
You
must
make
that
compatible
with
the
target
device,
so
check
these
things
about
that
device:
*
The
size
of
the
connector
ends
(i.e.
number
of
pins
and
their
arrangement).
*
The
gender
of
the
connectors:
Male
(with
pins)
vs.
female
(with
holes).
*
The
signals
carried
by
each
pin.
Only
three
signals
are
important
to
the
HP
95LX—the
transmit
signal
(TX),
the
receive
signal
(RX)
and
the
ground
(GND).
90
4.
CoMMUNICATING
WITH
OTHER
DEVICES

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