RFX-RMR
Issue 1.0
page 22 of
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8.4
Analog demodulator Power supplies and monitoring
The incoming n12v DC supply to the analog demodulator module is filtered and protected by
re-settable fuses FS1, FS2.
LED1 and LED2 are provided as A1 and A2 PLL ‘out of lock’ alarms. The LED’s will be illuminated red
when the PLL circuit is out of lock. Alarms are also sent for front panel display.
8.5
Front Panel Controller / Display Board
LCD display
CPLD
Micro Controller
Program
memory
E2
Cancel
Enter
A function
B function
I
2
C to all
Remote control
The Front Panel / Display Controller is the main system controller for the unit. All configurations of the
unit hardware are from this board. An I
2
C two-wire interface is used to communicate with all other
intelligent devices within the unit. This carries the command data and reads back status data from all
boards within the unit.
All configuration parameters, video settings, audio settings, frequencies etc. are held on this board.
This allows the ability to remove and change other boards within the unit without the loss of set-up
parameters.
At power-up this board initializes all the other boards and during normal operation monitors all the
major functions and reports any problems as part of the unit status.
