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10
Chapter 2
12. Knob - Used to continuously vary certain parameters. The knob has an
acceleration factor that causes the rate of change to increase as the knob is turned
faster. Turning slowly allows for a fine adjustment at the smallest displayed
decimal place.
2.4
General Operation
2.4.1
Display Elements
The Model 8000 uses a graphical display to depict information about the current state
of the system. The display can be broken down into four basic elements: static fields,
non-editable data fields, editable data fields, and soft key labels.
2.4.1.1
Static Fields
Static fields are elements on the display which do not change from moment to
moment. These can include help text, screen titles, and error messages.
2.4.1.2
Non-Editable Data Fields
Non-editable data fields are used mainly to display read back information, such as
temperature, laser current, etc. These fields can have a prefix or suffix label, such as
"Io=" or "mA", and are periodically updated by the system.
2.4.1.3
Editable Data Fields
Editable data fields are used for module and system settings such as current set point,
temperature set point, display contrast, etc. An editable field has four distinct display
states: focused, focused and editing, non-focused, and read-only.
The focused state indicates that the field has the input "focus." When the a field has
the focus, it is shown in reverse color (white text on black background if the display
is not inverted). Any keyboard entry or knob adjustment will be applied to the field,
and only one field at a time on the display can have focus. Move between fields using
the up and down arrow keys.
When the user starts to make changes to the data field using the numeric or left/right
arrows, the field enters the focused and editing state. In this state, a box is drawn
around the data field to indicate changes are being made to the value. See section
2.4.1.3.1 below for a description of how the keyboard operates while in this state.
The box will remain around the field until Enter or Clear is pressed, or the user
moves focus to another field using the up or down arrows.
The non-focused state indicates that the field is editable, but does not currently have
the focus. These fields are drawn with a solid underline. Using the up and down
arrows, focus can be moved to these fields.
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System Operation
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