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Polling a Tape Reader
Polling is a centrally controlled method (using a central
unit such as a 1050 master station or a transmission
control unit) which permits stations on a line to trans-
mit without contending for the line.
The presence of tape in the tape reader of any 1.050
system places the reader in a ready status for polling
operations (if the assignment switch for that reader is
positioned to
SEND).
When the component is polled,
reading of the tape starts automatically and the key-
board is locked.
When the stop-code switch is set to
SENSE
and a
reader-stop code is :read from tape, the reader stops.
If the poll was a common poll (component select
character-0), the keyboard automatically unlocks to
permit the entering of data. However, if the poll was
for a specific reader (component select character-G or
7) the keyboard will remain locked at this time. To
restart the selected reader, the operator must press the
line-reader-start button.
Therefore, if interspersed reading and keying is de-
sired, poll the station with the common polling charac-
ter (0), or keyboard polling character 5.
Note:
If
the keyboard polling character 5 is used, reader I can
be started by pressing the line-reader-start button. Reader-2
must be recognized before
it
can start.
When the common polling character is used,
I. Reader-I will transmit if it is assigned (component
assignment switch set to
SEND)
and
READY.
2. Reader-2 will transmit if it is assigned and ready
when reader-I is not.
3. The keyboard is unlocked if neither reader is as-
signed and ready.
Reader-Stop Code
Home
Loop
If the Prog-Dup switch is set to
PROG,
and a reader stop
code is sensed, the reader stops and the code is not
punched. It can be restarted by pressing the reader
start home button. If the reader stop code is sensed
when the prog-dup switch is set to
DUP,
the cod·e is
punched, and the reader does not stop.
Note: Check the Reader Stop - Prefix
J
special feature ulllder
the 1051 Control Unit - Special Features.
Line Loop
In this mode of operation, the action of a sensed
reader-stop code is conditioned by the setting of the
stop-code switch. With this switch set to
SENSE,
trans-
mission from the reader to the line halts when a reader-
48
1050 Detailed Information
stop code is sensed and is transmitted. To restart, the
reader start line button must be pressed. If the reader-
stop code is preceded by a bypass code the reader will
not stop, but the code is transmitted.
In the
OFF
position, the reader-stop code is trans-
mitted without stopping the reader. Punches receiving
from the line punch the reader-stop code with this
switch set to either
SENSE
or
OFF.
Reader Skip (Home Loop Only)
This operation is effective only after the reader has
been stopped by sensing a reader-stop code punched
in the tape. After such a stop, pressing the reader-skip
button on the keyboard starts the reader advancing,
passing over punched data until a tab, CR/LF, or line
feed code is sensed. At this point, the coded function
occurs and reading resumes. If another reader-stop
code is sensed, the reader stops again. Skipping can be
restarted by again pressing the reader skip button;
reading can be resumed by pressing the reader start
home button.
Automatic Tape Reread
This operation requires either the home-correction spe-
cial feature or the line-correction special feature. This
permits the selected tape reader to backspace (after
the proper signal) to the beginning of a record and
then reread the record.
During line transmission, this operation is repeated
two more times, if necessary. After the third read at-
tempt, the reader stops and manual intervention is
necessary.
See Home Correction and Line Correction in the
1051 Special Features section.
1054 Paper-Tape Reader - Special Features
Center-Roll-Feed Reel and Take-Up Reel
This special feature permits the tape to be read in the
same order in which it was punched, by feeding from
the center of the punched tape roll (see Figure 8). It
also provides a power-driven take-up reel for the re-
winding of tape after it has been read. The center-roll-
feed and take-up reels are 6 inches in diameter.
Edge-Punch Read
This special feature permits edge-punched (chad type)
documents to be read by the paper-tape reader. The
documents can be paper, punched card, or ledger card
stock with a minimum thickness of .004 inch and a
maximum thickness of .010 inch, including folds.
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