Comtech EF Data SLM-5650B - Vacuum Fluorescent Display (VFD); Figure 5-4. Vacuum Fluorescent Display

SLM-5650B Satellite Modem
Revision 2
Front Panel Operation 5–4 MN-SLM-5650B
LED Color Condition
Remote
Green
The modem is in Remote Communication Mode.
Off
The modem is in Local Mode – remote monitoring is possible, but no remote
control.
Test Mode
Orange
A Test Mode is selected (Example: IF Loopback).
Off
No Test Mode is selected.
Encryption On
Green
Encryption is enabled.
Off Encryption is disabled.
5.1.3 Vacuum Fluorescent Display (VFD)
Figure 5-4. Vacuum Fluorescent Display
The SLM-5650B 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 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.