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M o d e l
8223 Rs-232C I n t e r f a c e
,
M o d e l
DRC-9 1C/
9
3
C
Figure 8223-2.
Word Structure
S t o p
B i t
(s)
R e q u e s t
t o Send
(CA)
-
indicates t o
8223.3
Configuration
of
Dip
the
host computer or terminal that
Switches
the DRC-91C/93C I n t e r f a c e is ready
t o transmit data.
T h e
Interface
8223.3.1
Selection of Baud Rate
transmits data on l i n e BA when
the
''ON"
state is maintained on
CC,
CB
The
Model
8223
has
a
f i e l d
and CF,
while
a l o w level on these
selectable
baud
rate
using
D I P
l i n e s inhibits transmission by the
switch package S1
(8
switches) on
Interface.
the
I n t e r f a c e card.
T h e
baud rate
is selected by closing the switch
C l e a r
t o Send (CB)
-
indicates t o
position for the
desired
baud rate
t h e
I n t e r f a c e
t h a t
d a t a
and making sure a l l o t h e r p o s i t i o n s
t r a n s m i s s i o n
i s
a l l o w e d .
are open.
T a b l e
8223-3 gives
the
Internally pulled up t o maintain
baud rate s e l e c t i o n table.
Only
"ON"
s t a t e when
l e f t
disconnected.
the 300 and 1200 baud rates have
b e e n
t e s t e d
a n d
a r e
f u l l y
Data
Set
Ready (CC)
-
indicates t o
supported.
t h e
Interface
t h a t
t h e
h o s t
computer o r terminal is not i n a
Table
8223-3.
Baud Rate Switch
S1
test m o d e and that power is ON.
Signal
Ground
(AB)
-
this
l i n e is
the
common s i g n a l connection for
the Interface.
Received Line Signal Detector (CF)
-
this
l i n e is
held
p o s i t i v e
("ON")
when
the
I n t e r f a c e
is receiving
signals from
the host
computer.
When
held
l o w
("OFF")
the
BB line
i s
clamped
t o
i n h i b i t
d a t a
reception.
I n t e r n a l l y pulled up t o
maintain
"ON"
s t a t e
when
l e f t
disconnected.
8223.3.2
word
structure Selection
Data Terminal Ready (CD)
-
asserted
T h e
word s t r u c t u r e is determined by
by the I n t e r f a c e whenever the DRC-
s w i t c h
s e t t i n g s
f o r
character
91C/93C/8223
p o w e r
is
"ON"
t o
length, p a r i t y and s t o p
b i t s
using
indicate
that
the
I n t e r f a c e
is
D I P
switch
package
S2
on
the
ready t o receive and t r a n s m i t data.
I n t e r f a c e
Card ( 6
switches).
R e f e r
t o
T a b l e
8223-4 f o r s e t t i n g s
where
"0"
is OPEN and "1" is CLOSED.
8223-2
COPYRIGHT
12/87 LSCI
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