Comtech EF Data CDM-550T - Manual (Page 37)

6–1
Chapter 6. FRONT PANEL
OPERATION
6.1 Introduction
Figure 6-1. CDM-550T Front Panel
The user can fully control and monitor the operation of the CDM-550T 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.
Vacuum Fluorescent Display Keypad LED Indicators