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50
Sun-3/75
Hardware
Installation
Manual
Table
A-5
Description
of
Serial
Port
Signals
—
Continued
Pin
Signal
Signal
Name
Direction
(Input
or
Description
Output)
6
DSR
Data
Set
Ready
input
Signal
from
the
data
communica-
tions
equipment
indicates the
status
of
the local data
set
—
that
is,
a
peripheral
connected
to the
Sun.
7
GND
Signal
Ground
none
Signal
Gound
provides a reference
level for the signal voltages.
8
DCD
Data
Carrier Detect
input
The
data
communications
equip-
ment
has
detected "carrier,"
for
example,
a
modem
senses tones
sent
to
it
by
another
modem
over
phone
lines.
15
DB
Transmit Clock from
DCE
input
Transmit
clock
from
the
modem.
This
signal
is
usually not
used
for
asynchronous
devices
(most
termi-
nals, printers,
modems,
etc.).
17
DD
Receive Clock from
DCE
input
Receive
clock
from
the
modem.
This
signal
is
usually not
used
for
asynchronous
devices
(most
termi-
nals, printers,
modems,
etc.).
20
DTR
Data Terminal
Ready
output
Indicates
that the
Sun
is
powered
on and
willing
to
communicate
as
the "local data
terminal" with
the
data
communication equipment
(for
example,
the
modem).
24
DA
Transmit
Clock from
DTE
output
Provides
transmit
clock
from
the
Sun. This
signal
is
usually not
used
for
asynchronous
devices (most
ter-
minals,
printers,
modems,
etc.).
25
VERR
reference
-5V
level
output
This
signal
is
used
by
some
modems
to
sense connection
to
the
workstation.
sun
microsystems
Revision
A
of 31
September 1986
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