Chapter 2 System Operation 11
When the editable data field is in the read-only state, it looks and acts exactly like a
non-editable data field. Like the non-editable data field, it cannot have focus, and the
up or down arrow keys will skip over the field. This state is used primarily to lockout
specific data elements from front panel change when the Model 8000 is in remote
mode. Any IEEE-488 or RS-232 communication will place the unit in remote mode,
and editable fields that are protected during remote operations change to the read
only state.
2.4.1.3.1 Changing Data Fields
A data field can only be changed from the front panel when the field has the focus.
Some fields are numeric-based, such as current set point or temperature limits. Other
fields are multi-choice fields, such as Yes/No fields. Both types are changed with the
left and right arrows or the knob. Below is a description of each of the keys used for
front panel input.
Perhaps the most important key is the
Enter
key. Any changes to a data field made
with the numeric pad or left/right arrows are not put into effect
until the enter key is
pressed
. It is a common mistake to type in a number and press the up or down arrow
to move to the next field or change to another screen without first pressing
Enter
to
store the new value. If focus is removed from the field before the
Enter
key is
pressed, it reverts to its previous value, discarding the user’s input. The
Clear
button
is used to revert a value being changed back to the previous value before
Enter
is
pressed.
When changing values with the knob, if the focused field is
not
currently being
edited,
changes made with the knob take effect
immediately
.
There is no need to
press
Enter
after making changes with the knob. If a field
is
being edited, then the
knob acts as a simple up/down adjustment to the edited value, and these changes do
not take affect until the
Enter
key is pressed.
There are a few other keys the operator can use during input. The
+/-
button is used
to change the sign of a numerical input, such as 45.0 to -45.0, but does not otherwise
affect the value. If the field is a numeric field, the left arrow functions as a backspace
key, allowing correction of a mis-typed digits. If the field is a multi-choice field, such
as a Yes/No field, the left and right arrows function as previous and next choice,
respectively.
2.4.1.4 Soft Key Labels
Soft key labels are labels for the buttons located to the immediate right of the display.
Each label either indicates the action that is performed when the corresponding key is
pressed (such as changing screens), or the state of a data element in the system (such
as laser output OFF/ON). In the first case, pressing the corresponding soft key will
cause the action to happen, such as changing to the setup screen when the
Setup
soft
key is pressed from a module’s main screen. In the second case, pressing the soft key
will change the associated state, such as turning a laser output ON. Like the editable
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