Comtech EF Data CDM-700 - Manual (Page 58)

CDM-700 High Speed Satellite Modem Revision 5
Front Panel Operation MN/CDM700.IOM
6–4
6.1.3 Front Panel Vacuum Flourescent Display (VFD)
The CDM-700 features a Vacuum Fluorescent
Display (VFD). The VFD is an active display
showing two lines of 24 characters each. It
produces a blue light, the brightness of which
can be adjusted. Compared to a Liquid Crystal
Display (LCD), it has greatly superior viewing characteristics and does not suffer problems of
viewing angle or contrast.
As shown above, the ‘welcome screen’ is displayed whenever power is first applied to the unit.
The top line identifies the unit model (i.e., CDM-700); the bottom line displays the CDM-700’s
installed Firmware Version (version number varies).
Pressing any key navigates to the top-level Select menu. On most menu screens, a flashing, solid-
block cursor blinks at a once-per-second rate. This cursor indicates the currently selected item,
digit, or field:
CONFIG: Remote Tx Rx
Intfc1 Intfc2 Ref Aux
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:
Tx IF Freq: 0140.0000 MHz
(◄ ► ▲ ▼ ENT)
To prevent the display from becoming burnt by a constant image, the unit employs a screen saver
feature, which activates after one hour and constantly scrolls and wraps a message across the
screen. 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…’ as shown:
Circuit ID: -------------
not locked. Press any key..
Press any key to restore the previously active screen.