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

Item
IF Lock
Data Lock
Remote
Test Mode
Encryption ON
7.1.3

Vacuum Fluorescent Display (VFD)

The SLM-5650A features a VFD (Item 5 in Figure 7-1). The VFD is an active display showing two
lines of 40 characters each. It produces a blue light with adjustavle brightness. Compared to a
LCD, it has superior viewing characteristics and does not suffer problems of viewing angle or
contrast.
The opening screen displays once you apply power to the unit. The top line identifies the unit
model (i.e., Comtech SLM-5650A Modem). The bottom line displays the running Firmware
Version (this number may vary) and the current operating mode for the modem.
Press any key to display the top-level Select menu. On most menu screens, you will see a
flashing, solid-block cursor that blinks at a once-per-second rate. This indicates the currently
selected item, digit, or field:
SELECT: Configure
Save/Load
Where this solid block cursor obscures the item under edit (e.g., a numeric field), the cursor
automatically changes to an underline cursor:
Tx Frequency:
Spectrum:
Front Panel Operation
Lights GREEN if the Demodulator has constellation lock.
•
Remains OFF when there is no constellation lock.
•
Lights GREEN if the Decoder is locked.
•
Remains OFF when there is no Decoder lock.
•
Lights GREEN if the modem is in Remote Communication Mode.
•
Remains OFF when the unit is in Local Mode (remote monitoring is possible,
•
but there is no remote control).
Lights AMBER when a Test Mode (e.g., IF Loopback) is active.
•
Remains OFF when no Test Modes are active.
•
Lights GREEN when Encryption is ENABLED.
•
Remains OFF when Encryption is DISABLED.
•
Monitor Test
Utility
1955.0000 MHz
Normal (E)
7–4
Description
(E)
SLM-5650A Satellite Modem
Revision 10
MN-SLM-5650A