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6–1
Chapter 6. FRONT PANEL
OPERATION
6.1 Description
Figure 6-1. Front Panel View
The user can fully control and monitor the operation of the CDM-600 from the front
panel, using the keypad and display. Nested menus are used, which display all available
options, and prompt the user to carry out a required action.
The display has two lines each of 40 characters. On most menu screens, the user will
observe a flashing solid block cursor, which blinks at a once-per-second rate. This
indicates the currently selected item, digit, or field. Where this solid block cursor would
obscure the item being edited (for example, a numeric field) the cursor will automatically
change to an underline cursor.
If the user were to display the same screen for weeks at a time, the display could become
‘burnt’ with this image. To prevent this, the unit has a ‘screen saver’ feature that will
activate after 1 hour. The top line of the display will show the Circuit ID (which can be
entered by the user) and the bottom line will show the circuit Eb/No value (if the demod
is locked) followed by ‘Press any key....’. The message moves from right to left across
the screen, then wraps around. Pressing any key will restore the previous screen.