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User Interfaces
4.1.1 Front Panel LCD Display
The front panel display is a 2 line by 16-character LCD display. The display is lighted and the
brightness can be set to increase when the front panel is currently in use. The LCD display
automatically dims after a period of inactivity. The display has two distinct areas showing current
information. The upper area shows the current parameter being monitored, such as 'Frequency'
or 'Data Rate'. The lower line shows the current value of that parameter. The LCD display is a
single entry window into the large matrix of parameters that can be monitored and set from the
front panel.
4.1.2 Front Panel LED Indicators
Eight LEDs on the DM240 front panel (Refer to Table 4-2) indicate the status of the DM240's
operation. The LED colors maintain a consistent meaning. Green signifies that the indication is
appropriate for normal operation, Yellow means that there is a condition not proper for normal
operation, and Red indicates a fault condition that will result in lost communications.
LED
Color
Transmit On
Green
Major Alarm
Minor Alarm
Yellow
Test Mode
Yellow
Power
Green
Fault
Event
Yellow
Remote
Green
4.1.3 Front Panel Keypad
The front panel keypad consists of two areas: a 10-key numeric entry with 2 additional keys for
the 'Enter' and 'Clear' function. The second area is a set of 'Arrow' or 'Cursor' keys (↑), (↓), (→),
(←), used to navigate the parameter currently being monitored or controlled. Table 4-3 describes
the key functions available at the front panel.
4.1.4 Parameter Setup
The four arrow keys (↑), (↓), (→), (←), to the right of the LCD display are used to navigate the
menu tree and select the parameter to be set. After arriving at a parameter that needs to be
modified, depress <ENTER>. The first space of the modifiable parameter highlights (blinks) and
is ready for a new parameter to be entered. After entering the new parameter using the keypad
(Refer to Figure 4-3), depress <ENTER> to lock in the new parameter. If a change needs to be
made prior to pressing <ENTER>, depress <CLEAR> and the display defaults back to the original
parameter. Depress <ENTER> again and re-enter the new parameters followed by <ENTER>.
Following a valid input, the DM240 will place the new setting into the nonvolatile SRAM making it
available immediately and available the next time the unit is powered-up.
4-2
Table 4-2.
Indicates the DM240 Transmitter is turned on.
Red
Indicates that the transmit direction has failed, losing traffic.
Indicates a transmit warning condition exists.
Indicates the modulator is involved in a current test mode
activity.
Indicates the DM240 unit is currently powered up.
Red
Indicates a common fault exists such as power out of spec.
Indicates that events have been logged into the event buffer.
Indicates that the unit is set to respond to the remote control
or terminal input.
DM240-DVB High-Speed Digital Modulator
Function
TM083 - Rev. 3.0
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