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26
Sun-3/75
Hardware
Installation
Manual
Connecting
a Printer
to
the
Sun-3/75
2.10.
Connecting
the
Sun-
3/75
to
the
Ethernet
NOTE
CAUTION
The
serial
ports arc
wired
as
DTEs.
Most
printers are
wired
as
DTEs
too.
To
con-
nect
a
printer to
a
serial
port
you must
first
make
certain that the printer
you
are
using has a
DB-25
connector
and
uses
the
RS-232-C
standard.
Most
serial
printers do.
However
it
should
be
noted
that
you cannot
connect
a
parallel
inter-
face
printer to
a Sun-3/75
unless
you
also
use a
serial-to-parallel
converter.
After
determining
that
you have
a
serial
interface printer (or
a
parallel interface printer
with a
serial-to-parallel
converter),
connect
the
printer to either
serial
port
with a
null
modem
cable.
Sun
part
number
530-1056.
In the
null
modem
cable,
pins
2 and 3
are
crossed
4 and
5
are
crossed
6 and 20
are
crossed
and
pin 7
is
wired
straight
through.
"Pins 2 and
3
crossed"
means
that
the signal entering the cable
on
pin
2 emerges
on
pin
3,
and
vice versa
(see the figure
above).
Refer
to
the
manual
that
comes
with
your
printer to
make
certain that the signals
needed
to
operate the
printer are
provided
at
the
cornea
pins
of
the
serial port.
Refer
also
to
System
Administration
for
the
Sun
Workstation,
part
number
800-
1
150,
and
Installing
UNIX
on
the
Sun
Workstation,
part
number
800-1
3
1
7,
which
detail
connecting
to
a
printer.
If
you
ordered
the
Ethernet
kit,
you
will find
included
in the
box
with
the
manu-
als
and
cables the Ethernet transceiver
and
transceiver cable (see the
following
figure,
"Linking
Up
to
an Ethernet").
The
coaxial cable
and
terminators neces-
sary to
connect
multiple
machines
to
a
network
may
be purchased
separately
from Sun.
B
efore
going
on,
you
may
wish
to
make
certain that
your Sun-3
175
CPU
board
is
properly configured
for your
particular
Ethernet
transceiver.
The board comes
from
the
factory
set
for Level
2.
If
you
are using
a
Level
1
Ethernet
transceiver,
the
shunt
shorting
pins
7
and 8
of
J2503
at
board
location
K-ll must be
IN. If
you
are using
a
Level
2
Ethernet
transceiver,
then the shunt
must be
OUT.
If
J2503
is
incorrectly configured,
your
transceiver
will
not work.
Setting
up
an
Ethernet with
all
Sun-supplied
components
is
fairiy
straightfor-
ward:
1
.
Screw
the
50
ohm
coaxial cable into
one of
the transceiver
N
connectors
(an
N
connector
is
a round,
screw-on conneaor).
2.
Each
end of
the coaxial
cable
must have
a
50
ohm
terminator
attached.
This
may
be done
either
by
attaching the
50
ohm
terminator
o
to the transceiver's
vacant
N
connector, or
to
o
the
end of
the coaxial cable,
using a
barrel
conneaor.
(A
barrel
connec-
tor
is
a double
N
connector.)
Handle
the coaxial cable
with
some
care,
as
it
is
fragile;
don't
install
it
in
an
area
where
it
may
be
run
over or stepped
on.
#sun
V
mcrosyslems
Revision
A
of 31
September 1986
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