1256 User Manual Publication No. 980855 Rev. A
Using the Front-Panel Controls 3-2
EADS North America Test and Services
Front Panel
The front-panel controls consist of four keypad switches
(pushbuttons), a four-line alphanumeric display, and a rotary knob
(See
Figure 3-1, Front-Panel Controls
).
The display contains four alphanumeric lines of text. To the left of
the display are the four keys, each corresponding to one line of the
display. The keys select the display line to work with. After
selecting a display line, the user may rotate the knob to change the
parameter indicated on the selected line.
Figure 3-1, Front-Panel Controls
Understanding
the Hierarchical
Menu
The 1256 uses a multiple-level, hierarchical menu tree. To help the
user visualize the menu tree, the menu is limited to four levels.
Each hierarchical level is shown on its own line on the front-panel
display. The top line shows the top level.
The user begins by selecting a general type of function on line 1
(top line). Then, on line 2, the 1256 displays choices that are more
specific to the general function that was selected on line 1. After
the user selects from the choices on line 2, the 1256 shows related
parameters on line 3. Once the user chooses a parameter from
line 3, the 1256 displays the current status, or value, of this
parameter on line 4. On line 4, the user may choose from among
different values for the parameter.
For example, suppose slot 3 of the 1256 contains a 1260-120
plug-in. To close relay channel 2 on this plug-in, the user proceeds
as follows:
1256
SWITCHING SYSTEM
Display
Keypad
i h
Speaker
Knob
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