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FIG 8
LINE
Currt'l'lt
loop
I
Current
I
loop
LINE
$4
DATA FLOW
ERROR. Data must co.me
from
UART together
with signal DR. DR is fed back to UART as
signal ORR which i:esets OR. UART accepts do-
_ ta os long as OR:O. A delay between DR and
DRR is arranged in circuit: A17:4-C1-A17:5.
This is o simulated "data r.eceive" signal.
Start condition
and
DR activate Pl. As long
as start is active, every DR gives a PI and
this continues until start is taken away.
Three FF's ar0 used
for
the start condition;
PST, PSP and PSS. DC2 triggers PST which pre-
sets PSS. OC4 triggers PSP which clears PSS.
To get DC2 and DC4, jumpers PS2:2 and 4 ore
used. Switch PUNCH(S4) must be ON when using
the PUNCH. Start condition is always on hand
when interface is Off LINE or during POR.
4.3
READER
See
-F'ig.
8
&
10.
The READER is controlled
by
RS vio RSS and
,ROS. A
negative pulse
frOll
ROS
initiates
RS
and
Step
is sent to
the
READER whic:h moves
the tape to the next
word. Ouring RDS, CR
&
Stop decoder is
o~
pened and data are
checked for DC3 and
CR. This information
eon be used to stop
the READER
by
using
jumper PS2:5
~
6. lf
so the operation of
the READER is stopp•
ed ond must be start-
ed with START. Deloy
which is controlled
by
jumper PS2:
7
or
8 affects ROS ond
thua'obo RS,
H
FIG
9
5148
•
..,__....,. ... step
(EAD£R
,_----eor
i......----ISTOP{EXT)
""------4START
Feed hole on Ch9 together with RSS give TBRL
to UART. This is a strobe puhe that trans-
. fen the parallel data
on
Ch 1-8 to UART.
When
UART
hoa
tranHitted the serial data it
oho
gives a
signal,
TRE,
which is
used to
trigger
ROS (if no Delay or Stop) in order to
re~·
at
the operation. Condition CTS from LINE ( B )
has only influence ot the first start. I
LINE wants to stop the reading, this con on•
ly be done by signal DC3 vio received data
line to RO and UART. Jumper PS2:3 is.used.
Other means of stopping the REAOER can be
by
reading code OC3 on the tape. Otherwise
EOT or Stop(L) stop
the
READER. If
-~~oht/
Left Feed ore
depressed on
the PUNCHtREAbER
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