Comtech EF Data CDM-740 - Manual (Page 55)

CDM-740 Advanced Satellite Modem Revision 0
Front Panel Operation MN-CDM740
5–3
5.1.3 Front Panel Vacuum Fluorescent Display (VFD)
The CDM-740 features a Vacuum
Fluorescent Display (VFD). The VFD
is an active display showing two lines
of 40 characters each. It produces a blue light, the brightness of which can be controlled by the
user. 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, 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 (e.g., 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 that activates after 1 hour:
CDM740 Ver1.1.1
...... PRESS ANY KEY ......
The message moves from right to left across the screen, then wraps around. The top line of the
display identifies the product (i.e., the CDM-740) with the running firmware version or the
Circuit ID (which can be entered by the user).
The bottom line reads ‘ ...... PRESS ANY KEY ...... ’.
Pressing any key will restore the previous screen.
5.2 Front Panel Menu
The table on the next page illustrates the hierarchal structure of the front panel menu tree, and
provides a quick references for the chapter sections provide detailed explanations about the available
front panel menu, menu branch, and submenu selections.
5.2.1 Opening Screen
This ‘welcome’ screen is displayed whenever power is first applied to the unit. The modem model
(i.e., the CDM-740), installed options, and the running firmware version are indicated here:
Comtech CDM-740 Advanced Satellite Modem
TPC installed Ver1.1.1
Press any key to go to the Select: (Main) menu screen.