Chapter 4. Front Panel Menus

Front Panel Operation

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Keypad

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Menu Tree

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Menu Screens

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4.1FRONT PANEL OPERATION

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.

4.1.1KEYPAD

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.

ENT

CLR

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