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18
Remote control
The remote control uses the NRC-17 coding system based
on a 17-bit biphase code. The infrared receiver / amplifier
Hfc1 receives pulse modulated infrared light. The receiver
converts the light into an electrical signal, which is demodu-
lated, amplified, and fed out from pin 3. The signal is taken
to microcontroller pin 64 via transistor tfc3. During code
transmission, the microcontroller sends negative pulses
from pin 46. This causes LED Dfc4 to flash as an indication
of the accepted code.
Local control
The local control comprises only four primary daily use
functions: volume + / - and program stepping + / -. These
functions makes it possible to use the receiver without the
hand-held remote control unit. The information from func-
tion switches SWfc1...SWfc4 is fed to microcontroller pins
61 and 62.
The LEDs on the local control unit indicate the receiver state
as follows:
In On-mode, the green LED Dfc17 lights due to the +12Vp.
In Stby-mode, the red LED Dfc16 (on the micropower block)
lights to indicate the mains voltage is connected.
In Rec-mode, the red LED Dfc4 lights due to the low level
on microcontroller pin 46.
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