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CDM-Qx Satellite Modem Revision 5
External Connections MN/CDMQx.IOM
4–2
4.2 Front Panel
LED Keypad Display (VFD)
Indicators
The Modem front panel features a Vacuum Fluorescent Display (VFD), a keypad, and
eight LED indicators. The user enters data via the keypad, and messages are displayed on
the VFD. The LEDs indicate, in a summary fashion, the status of the selected module.
The VFD is an active display showing 2 lines, each of 40 characters. It produces a blue
light, the brightness of which can be controlled by the user. It has greatly superior
viewing characteristics compared to a Liquid Crystal Display (LCD), and does not suffer
problems with viewing angle, contrast or temperature.
The keypad has six individual keyswitches, mounted directly behind a fully sealed
membrane overlay. They have a positive ‘click’ action, which provides the user with
tactile feedback. These six switches are identified as [↑], [↓], [→], [←] arrows, ENT and
CLR. The functions of these keys are described in the ‘FRONT PANEL
OPERATION’ section.
There are eight LEDs on the front panel. The behavior of these LEDs is described in the
‘FRONT PANEL OPERATION’ section.
IMPORTANT
A USB Slave connector is provided on the front panel. This feature
allows the user to reflash firmware.