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RS-232C
T
he RS·232C
is the
standards of
the
EIA (Electronics
Industr
ies Assoc iation)
which
has been
eitabliihed
to set
the
standard
interfacing
requiremena between
the
data
terminal
un
it
and
the
data
com
munication
unit.
The
CE· 158
has
been developed
to
meet
those
standards.
Main
parts.
of
these
standards define the
following
co nd itions:
(1)
EJectr ical
characte
ristics
(2)
Mechanical
c haracteristics of
the
interface
unit
(3). Functions
of
interlacing signals
( 1)
Electrical characteristics
1} Input
signal below
-
3 V is
regarded
as
MA RK.
and above
+3 V
as SPACE.
2t
Load side
impedance
shall
be
a
d
irect
current
resista
nce
of more
than
3
Kohrns
against
an
impressed
voltage
o
f
less than
25
V.
or
less tha
n
7 Kohms
against
an
impressed voltage o
f
3to25V.
3)
Output
sign•I
in MAR
K st•
te
sh•ll
be
-5
to
-15
V
or
output
sign•I
in
SPACE
state
sh all
be+5
V
to+
15V.
4)
Effect
ive
load
capacitance
at
the end shall
be
less
than
2500
p
F.
inclvdin
g
c
able
capac·
itance
.
(2)
Functions
of
interfacing
signals
Connec
tor
signal configuration
The DB·25{W)
connector
comes
with
the
CE· 158.
O
OO
O
O
@
Q)®
@
C
D
O)
(Z)
()
0 0 0 0 0
·~
0
0
0 () () ()
Connector Pin Configuration
Actually, e ight
pins
are
used out
of
twenty
five
pins.
NOTE:
Different
signal
connections
may
be
required
depend ing on signals
used
by the
device
connected.
Use
the
metal
case
(type
0824659).
Do not
sell
this
PDF !!!
11
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