Single-Cycle Operation - IBM 1050 Reference Manual

tive LRC answer is received, retransmit this complete
unit.
Note:
~
is unnecessary for the master station to transmit an
EOT c at the completion of a message because this is used
at the s art of each polling or addressing operation. However, to
turn off the motors at a down-line station that has been re-
ceiving in the unattended mode, an EOT is required.
Printer
The #I printer (the printer cable-connected to the #I
printer position in the 105I) prints all addressing re-
sponses and terminal addresses, when its assignment
switch is set to the
SEND-REC
position. With this switch
set to the
SEND
position, addresses only print. When
set to the
RECEIVE
position, only responses print.
The #2 printer at this terminal prints neither the ad-
dresses nor responses when its assignment switch is set
to the
RECEIVE
position. When this switch is set to either
SEND
or
SEND-REC,
terminal addresses print.
Component recognition for the printers without the
use of Prefix-I or Prefix-2 codes occurs automatically
without the use of Prefix-I or Prefix-2 codes only when
the terminal is a master station and is operating in the
control
mode~
Printers are deselected by addressing
responses. A remote terminal must transmit compo-
nent recognition codes to the master station for each
receive component that is required for data reception.
When a
@
is transmitted by the master station, all
receive components, previously recognized by the re-
mote terminal, are deselected. Monitor printen:, lo-
cated at any terminal (master station or otherwise) do
not have to be recognized, to record transmitted data.
Single-Cycle Operation
Single-cycle or single-step reading (one character or
one card column) at a time is performed by setting the
single-cycle switch to the appropriate home or line po-
sition. This position must correspond with the assign-
ment switch setting for the selected reader. Press the
home or line-reader-start button. As the reader-start
button is released, the selected reader reads one char-
acter or card column and stops. This operation con-
thmes until the single-cycle switch is set to its
OFF
position. When the single-cycle switch is off, normal
reading occurs, when the appropriate reader-start but-
ton is pressed.
The reader-stop switch should always be used to stop
the reader prior to setting the single-cycle switch to
the proper position.
The following procedure illustrates the proper single-
cycling technique. A single-character error is discov-
ered in a paper-tape prepared during home loop oper-
70 1050 Detailed Information
ation. The character in error is in the second printed
line of data and is the middle of the line. The present
character is a numeric six; it should be an eight. A new
tape containing the proper character is to be punched.
The proper procedure for this operation is:
1. Turn the power on.
2. Set Printer I (assignment switch) to
HOME.
3. Set Reader I (assignment switch) to
HOME.
4. Set Punch I (assignment switch) to
HOME.
5. Insert the incorrect tape in Tape Reader 1 and
align for reading the first character.
6. Prepare the tape-leader in the tape punch by press-
ing the feed key.
7. Set the system switch to
PROG.
8. Press the reset button.
9. Key the proper component-recognition codes (home
component recognition installed) - Prefix and 1
(Printer 1
ON).
Prefix and 3 (Tape Punch 1
ON)
10. Set system switch to
DUP.
11. Press the home-reader-start button.
I2. Visually follow the printed line of data until the
carrier executes its return for printing the second
line, then
I3. Operate the reader-stop switch to
HOME
(this will
stop all reading, printing and punching).
14. Set the single-cycle switch to
HOME
(all home-loop
reading, printing and punching is now on a single··
cycle basis).
I5. Consecutively, press and release the home-reader-
s tart button until the last correct character, prior to
the error character, is printed.
16. Key in the correct character (8) at this point.
I7. Advance the tape in the tape reader, one character
position, by operating the tape advance wheel.
This will prevent the error character from being
read.
I8. Set the single-cycle switch
OFF.
19. Press the home-reader-start button. Normal read-
ing, printing, and punching will now resume.
The correction procedure for either adding or elimi-
nating characters is the same as previously described,
except for step I 7. If characters are to be added, no
tape advance is required after the additional charac-
ters are keyed after step 16. If characters are to be
eliminated, the tape is advanced over the characters to
be eliminated after completing step 16. No additional
keying occurs.
Single-cycling for line-loop operations is accom-
plished in a manner similar to home-loop. The major