Vacuum Fluorescent Display (Vfd) - Comtech EF Data SLM-5650A Installation And Operation Manual

SLM-5650A Satellite Modem
Front Panel Operation

5.1.3 Vacuum Fluorescent Display (VFD)

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.
5.1.3.1 Screen Saver
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 15 minutes.
The screen saver messages loop from right to left across the screen. Sandwiched between the
product display message "Comtech EF Data SLM-5650A Modem" and the user prompt
"Press any key to continue", the following operating statistics are provided:
Modem Status Code
01
02
03
04
05
06
07
The SLM-5650A 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
Description
Circuit Identification
Demodulator receive frequency offset from the nominal
Buffer fill status (%)
Receive signal level (dBm)
Estimated Eb/No
Estimated Corrected Bit Error Rate
Bit Error Rate reported by the internal Bit Error Rate Test set
5–4
Revision 8
MN-SLM5650A