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line over o Zener-diode.
-12V
is produced
by
o half-wove rectification
of o
frequency,
deriving from the BAUD rote generator, that
charges o capacitor. A Zener-diode deter-
mines the value.
2.6
CURRENT
LOOP
L]D'~E
t• )· .
CA.
~.2,~
I
-
...,__
-
I
I
-
-
I
:0\
(.
]
~:·.::
I
-
_ . .
-
I
I
-
-
I
-
-
ll
11
FIG 6
CURRENT LOOP/schematic
Isolated cvrrent loop with input resistance:
Rin
<
lOOohm at 20mA
Rin
<
50ohm ot 60mA
Voltage drop over output switch: typ. lV
Protected against inproper connections and
reverse transients.
2. 7
INTERCHANGE CONVENT! CNS
LOGICAL INDICATION
0
1
no current
~'
FIG 7
curren
open c.i.rcul.
BAUD
RATE
.,.~a
tor
3
C 0
N
S T R U C T I 0 N
&
The interface is built up on a FWB. The ~.B'
is inserted into board edge connector K2 Qt
F 4070, On PWB ore
two receptacles, type ;
DB 25 S,
marked
AUX(X2) ond LINE(X3). On
~8
are also
fo.ur
switches,
S l - S4
for opera.;,:
tion modes and six jumper plug sockets,
PS.··
1 - 6
which ore used for different purposes
like BAUD RATE,
control conditions etc. Thee.re
ore olso possibilities to connect certain
signals
to
ON(+12V)
or
OFF(-l2V)
via solder
jumpers
A
&
B.
See
Fig. 13.
4
FUN CT I 0 N _ _ _ _ _ _ _ _ _ _
4. l
GENERAL
See
Fig. 7 &
8.
One
main port for
PUNCH/READER
work is the
UART. The
other
main ports
ore;
BAUD RATE
generator and selectors,
CHARACTER FORMAT
circuits, CR & Stop- decoder for the READER,
control circuits for
PUNCH/READER,
remote
control
circuits,
LINE receivers and drivers#
OPTO-covplers, circuits for control signals,
MODE con1i>rol switches and different jumpers
for special purposes.
Operations mainly involving
the PUNCH
and
READER will here be explained.
4.2
PUNCH
See
Fig. 8
&
9.
The PUNCH con be operated from all three
sources, the READER, LINE or AUXILIARY. In
all coses remote control must be used in or-
d.er to octivote punch start and stop. When.
PI is H o
punch
cycle moy start. The only
kinds
of
information between the interface
ond the punch ore; doto channels l-9, PI ond
Opt
ti
Coupler
Curr
~nl
toop
fE'C.'l'-tYf.,,,
~
.,. __ P,..a..,l"..,al..,lt!..,t""D .. o""lt"""a _ _ _ _ _
ctionrH1I
1·8
..... ,___JERROR
LfART
----""""'fSTOP
EOT
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