Vacuum Fluorescent Display (Vfd); Cdm-570/570L Front Panel Menus; Opening Screen - Comtech EF Data CDM-570 Installation And Operation Manual

CDM-570/570L Satellite Modem with Optional IP Module
Front Panel Operation

5.1.3 Vacuum Fluorescent Display (VFD)

Compared to a Liquid Crystal Display (LCD), it has greatly superior viewing characteristics and
does not suffer problems of viewing angle or contrast.
On most menu screens, a flashing solid block cursor blinks at a once-per-second rate. This
indicates the currently selected item, digit, or field. Where it might obscure the item being edited
(e.g., a numeric field), the solid block cursor automatically changes to an underline cursor.
If the operating unit is left displaying the same screen for weeks at a time, the VFD could become
'burnt' with this image. To prevent such 'burn-in' a 'screen saver' feature activates after 1 hour.
The screen saver message moves from right to left across the screen, then wraps around. The
user-configurable Circuit ID displays on the VFD top line, while the bottom line displays the
demod lock state (i.e., 'Demod not locked.' or the circuit E
locked) followed by 'Press any key...'. Press any key to return to the previous screen.
5.2

CDM-570/570L Front Panel Menus

5.2.1

Opening Screen

The opening screen displays whenever power is first applied to the modem; from any other nested
menu, it is accessible by repeatedly pressing CLEAR. Otherwise, press any other key to advance
to the Select: (Main) menu screen.
If the Internal Reference warm-up delay feature is disabled (refer to SELECT:UTIL
REFERENCE
following screens displays:
If, however, the Internal Reference warm-up delay feature is enabled, one of the following
screens displays:
The bottom line counts down, in seconds, the time remaining for the warm-up period. During this
period, the Tx Carrier is deliberately muted. At the end of the warm-up period, the bottom line
reverts to the 'normal' opening screen display (i.e., it displays the modem Firmware version), and
the modem enters into its normal operational state.
Bypass (override) the warm-up period at any time by pressing the CLEAR key.
Warm-up Delay later in this chapter), depending on the modem type, one of the
The CDM-570/570L 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 user-controlled.
5–4
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MN/CDM570L.IOM
/N value if the demod is
b 0