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Keyboard Lock and Keyboard Inhibition
The status of the keyboard depends mainly on the mode of
operation.
•
3270 Mode
In 3270 mode the keyboard is normally free to type in
data until the operator initiates a system operation,
which inhibits the keyboard, that is, the keyboard does
not accept any further input until the initiated
operation has occurred. The keyboard is also inhibited
when data entry into a protected field is attempted. The
reason for inhibition is shown on line 25. The reset key
is used to reset the inhibition.
•
1052 Mode
In 1052 mode, the keyboard is normally locked and it
must be reset by a read inquiry command which is usually
issued by the operating system when the REQ Key is
operated. In locked state, no cursor is displayed.
Operating the RESET Key does not change the locked
state. The read inquiry command displays the cursor in
line 19 position 2, sounds the audible alarm and the
word
1
proceed
1
is displayed.
Any inhibit state of the
keyboard is displayed on line 25.
Inhibition due to
errors (such as writing into a protected field) may be
reset by the RESET Key.
However, when an action has
been initiated (e.g. the REQ key has been pressed) and
the wait indicator is on, the RESET key resets not only
the keyboard but also cancels the requested action.
The
following system keys are never locked or inhibited:
• START
• STOP
• INTR
Communicating with the System
2 - 1
3
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