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+SV
FIG 24
c
u
L
r o
r o
e
p
n
t
This circvlt hos no current limiting
ju~
..
pers. The transistor
acts simply os
a
sw},i.tch
controlled by
the
opto coupler where the
receiving device
has
to determine the cur-
rent its elf.
;
6.5 INTERCHANGE CIRCUITS, NAME
&
NUMBERS
Connectors X2
&
X3 with their utilized
pin~
names and numbers according to
C.C.I.T.T,
/
and
EIA
RS-232-C.
Their normol abbreviations and their sig-
naling directions ore included.
See
Fig.
25.
I
X2
X3
Interchange circuit,
No
&
name
DCE-
pin according
to
C.C.I.T.T.
No,.
101/protective
ground (earth)
2
103/transmitted data
3
104/received
data
105/reqvest to send
5
106/
ready
to sending
6
107/data set ready
7
102/signal ground
8
109/doto channel received
signal detector
according to
EIA RS-232-C
(name)
-DTE
AA/protective ground,
f
rome ground (FG)
BA/transmitted data (TD)
BB/received data (RD)
CA/request to send (RTS)
-
CB/clear to send (CTS)
CC/data set ready (DSR)
AB/signal ground (SG)
CF/received
line signal
detector
(DCD)
~i3~~~~}
:if
~~i~t~~fi?f~)~~~~}tit~tt~~~~~t;;i~~j~f~~~l~E~~;~:~~j~~~d}n~i/lf:~~J;i))1~~~)~Jfittf;)f t~~;1~1~~f U~~~~~=~~~~~f~/?~~tt~:~~;~~~rt ~tt~r~~~:}~~~
;: j
~ : ; ; : ; ~ 1 : ~ ~ ! : 1
: 1 : 1 1 : : :
: ; : ~ , i i : 1 ~ ~~1~:~~~,;~11i~
1
1 r n ~ : ~ : t 1 ; 1 ~ :
1
: i i : : 1 ~ : 1 ! ! ~ ! 1 : 1 ! : 1 : ~ i ~ ~ : : ! : : . : ; : : r ~ 1 ~ r
1
i : ~ ~ 1 ~ 1 1 1 ~
r11
1111
20
108/2/doto terminal ready
CD/data terminal ready (DTR)
I
21
110/signol quality detector
CG/signal quality detector (SQ)
22
125/colling indicator
CE/ring indicator (RI)
!1ff)\\j~j~
not
vsed
in accordance to
standards
FIG 25
~
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