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Keyboard Locked
During a home-loop operation the keyboard is auto-
matically locked when:
I. a reader is operating,
2. either the 1054 paper-tape reader or 1055 paper-
tape punch is reverse feeding during a reread or
delete operation.
3. a card punch is skipping, releasing, or duplicating.
The keyboard will remain locked if an interlock con-
dition (such as a card jam or empty hopper) occurs
on the punch.
4. a CR/LF (automatic or not), TAB, or LF function
occurs on the printer.
During a line-loop operation (with Line Control op-
erative) the keyboard is automatically locked when:
I. receiving from the line,
2. transmitting
to
the line from the reader. If a reader
is stopped due to an interlock condition (out of tape,
cards or a jam) the keyboard remains locked. Oper-
ating the reader stop switch unlocks it. This con-
dition is not altered by the position of the line-
control switch.
3. the keyboard assignment switch is set to
SEND,
and
until the system sends a positive response to the
keyboard polling address.
4. a @)answer is received to an LRC.
5. an EOB code is sent and the system is in the resend
status (resend light out).
6. an EOT code is received or transmitted.
7. a transmission timeout ends (9-18 seconds).
During a line-loop operation (with Line-Control in-
operative) the keyboard is automatically locked when:
1. receiving from the line or transmitting to the line
with a reader.
2. an EOB code is sent and the resend light is on.
The keyboard is also locked in line-loop with the
master-station special feature when:
I. receiving from the line or transmitting to the line
with a reader.
2. an EOB code is sent and the resend light is on.
3. the system is in a two-second timeout waiting period
for a polling or addressing response.
Keyboard Unlocked
The keyboard is unlocked in home loop when:
1.
neither reader is operating.
40
1050 Detailed Information
2. a reader stop code is recognized.
3. the reader stop switch is operated.
With line-control operative the keyboard is unlocked
when:
I. it is assigned to line and has recognized its assigned
polling character or the general polling character
"zero."
2. a reader is not in the ready condition (for a zero
poll).
3. a positive answer
®
to an LRC is received.
4. the resend light is turned off by pressing the resend
button after receipt of a negative answer
to
an LRC.
5. a reader is stopped upon sensing a reader stop code
or by manual operation of the reader stop switch
provided the keyboard is selected by a common
"zero" poll.
6. executing a carrier return (whether generated or an
automatic basis), tab, and line-feed.
With line-control inoperative the keyboard is un-
locked when:
I. a reader is in send mode and stopped upon recog-
nition of a reader-stop code or by manual operation
of the reader-stop switch.
2. a positive answer
®
to
an LRC is received.
3. the resend light is turned off by pressing the resend
button after receipt of a negative answer to an LRC.
4. the reset button is pressed.
5. executing a carrier return (whether generated or
automatic), tab, and line-feed.
6. a receive time-out (9-18 seconds) ends.
The keyboard is also unlocked during line-loop oper-
ation with the master station special feature when:
I. the master switch is set to
ON.
2. EOT code is received.
3. after a two-second polling or addressing response
timeout.
4. operation of reset button.
5. the 20-second receive time-out ends.
Setup Procedures
When the 1052 and/ or 1053 is used with the system,
the procedure is:
1. Turn the 1051 main-line switch on. This causes an
automatic systems reset. If the terminal is in a multi-
point network that is in use, turning the power on
can cause an error on the line. Therefore, it is de-
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