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CDS - PROGRAM PINS INTERFACE
CDS - PROGRAM PINS INTERFACE
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General
Each display electronics unit (DEU) has two graphics generator
circuit card assemblies (GG CCA). Each GG CCA can send
information to all six display units (DUs).
Coaxial Cable
Each GG CCA sends graphic data on a coax cable to a coax
coupler. The coax coupler splits the signal and sends the
graphics data to each DU.
ARINC 429 Status Bus
The display units monitor themselves for failures. Detected
failures go on an ARINC 429 bus back to each DEU.
The ARINC 429 status bus has this data:
* DU health data
* DU program pins
* Remote light sensor (RLS) data
* Coax connection data.
CDS - DISPLAY ELECTRONICS UNIT INTERFACES
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CDS - DISPLAY ELECTRONICS UNIT INTERFACES
CDS - DISPLAY ELECTRONICS UNIT INTERFACES
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General
The DUs get brightness control from the DEUs. These are the
brightness inputs to the DEUs:
* Brightness control panel
* Remote light sensors
* Bezel light sensors.
Manual Brightness Control
The flight crew use the brightness controls to control the
brightness of each display unit (DU). The left and right inboard
DUs and the lower center DU also have a brightness control for
the weather radar or terrain display from the ground proximity
warning system display.
Each DU receives a three-wire input from a dedicated control
potentiometer in the brightness control panel. These brightness
control inputs are converted to a digital signal in the DUs and go
to the DEUs on the ARINC 429 status bus so that the DEUs can
set the manual brightness for each DU seperately.
Automatic Brightness Control
The automatic brightness control function uses inputs from both
the remote light sensors (RLS) on the glareshield and the bezel
light sensors (BLS) on the individual DUs.
The remote light sensors send inputs to the outboard DUs and
then on the ARINC 429 status bus to the DEUs. The power for the
RLS is +/- 15v dc from the onside outboard DU. The DUs also
send bezel light sensor values to both DEUs on this ARINC 429
bus.
The DEUs divide the DUs into these pairs for the brightness
control function:
* Left outboard and inboard DUs
* Upper and lower center DUs
* Right outboard and inboard DUs.
The DEUs use the brightest value of the remote light sensor
inputs and the brightest value from the bezel light sensor pairs
to set the brightness of the DU pairs.
When the remote or bezel light sensors detect a rapid change to
bright light in the flight compartment, the DEUs rapidly increase
the DU brightness. If the ambient light decreases, the DEUs
decrease the DU brightness slowly. This is similar to the way
the human eye operates.
NOTE: When the DUs are very bright, the manual brightness
controls do not affect the displays or have a limited
effect.
Training Information Point
The remote light sensors are monitored by the DEUs and any
faults are logged in BITE.
CDS - BRIGHTNESS INTERFACES
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CDS - BRIGHTNESS INTERFACES
CDS - BRIGHTNESS INTERFACES
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Control Panels
These are the six control panels:
* Captain’s display select panel
* First officer’s display select panel
* Engine display control panel
　
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