Comtech EF Data CDM-500, Installation And Operation Manual

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Rev. 1.3 6–1
6
Chapter 6.
FRONT PANEL OPERATION
6.1 Description
The user can fully control and monitor the operation of the CDM-500 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 24 characters. On most menu screens, the user will
observe a flashing
solid block curso r, 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 curso r.
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 which will
activate after 1 hour. The top line of the display will show the Cicuit 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.
The keypad has six keys, the functions of which are described below: