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4.1 F
P
RONT
ANEL
The user can fully control and monitor the operation of the CiM-550 modem 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 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 which 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.
4.1.1 K
EYPAD
The keypad comprises six individual
key switches, mounted directly behind
a fully sealed membrane overlay. They
have a positive 'click' action, which
provides the user with tactile feedback.
These six switches are identified as UP
ARROW, DOWN ARROW, RIGHT
ARROW, LEFT ARROW, ENTER and
CLEAR.
Chapter 4. Front Panel Menus
O
PERATION
Front Panel Operation
Keypad
Menu Tree
Menu Screens
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23
27
ENT
CLR
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