ARINC 429 STATUS
R OUTBOARD DU
TO DEU 1
TO DEU 2

TO DEU 1
TO DEU 2

TO DEU 1
TO DEU 2

TO DEU 1
TO DEU 2

TO DEU 1
TO DEU 2

TO DEU 1
TO DEU 2

31-62-00-102.102 Rev 1 01/16/1999

CDS - DISPLAY ELECTRONICS UNIT INTERFACES

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737-600/700/800/900 TRAINING MANUAL CDS -- BRIGHTNESS INTERFACES THIS PAGE INTENTIONALLY LEFT BLANK
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CDS -- BRIGHTNESS INTERFACES 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 change 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 separately.
Automatic Brightness Control
The automatic brightness control function uses inputs from the remote light sensors (RLS) on the glareshield and the bezel light sensors (BLS) on each DU.
The remote light sensors send outputs to the outboard DUs and then on the ARINC 429 status bus to the DEUs.
737-600/700/800/900 TRAINING MANUAL

The remote light sensors also send an output to the DFCS mode control panel (MCP). The MCP uses this data for its own brightness control function.
The power for the RLS is +/- 15v dc from the onside outboard DU. The DUs also send bezel light sensor values to the 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 find a fast change to bright light in the flight compartment, the DEUs quickly 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.
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737-600/700/800/900 TRAINING MANUAL CDS -- BRIGHTNESS INTERFACES Training Information Point
The DEUs monitor the remote light sensors and put faults in BITE.
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31-62-00-122.002 Rev 1 07/05/2001
2

BRIGHTNESS L RLS
DFCS MCP 2
BRIGHTNESS R RLS
OUTBD DU
INBD DU
INBD DU

UPPER DU
LOWER DU
LOWER DU

CAPT BRIGHTNESS CONTROL PANEL INBD DU INBD DU
OUTBD DU F/O BRIGHTNESS CONTROL PANEL
737-600/700/800/900 TRAINING MANUAL

3 +/-15VDC
6 OVERALL

BLS
L OUTBOARD DU

COAXIAL COUPLER 1 6

3 OVERALL 6
3 WXR BLS COAXIAL
3 L INBOARD DU

COUPLER 2 DEU 1
3 3

OVERALL BLS 3
UPPER C DU
OVERALL
WXR

BLS

3 LOWER C DU 3
3 OVERALL
6 WXR
BLS 6

COAXIAL R INBOARD DU
COUPLER 3 6

OVERALL 3 COAXIALBLS+/-15VDC
COUPLER 4 R OUTBOARD DU
DEU 2
CDS - BRIGHTNESS INTERFACES

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CDS -- CONTROLS INTERFACES Control Panels
These are the six control panels:
-Captain's display select panel
-First officer's display select panel
-Engine display control panel
-Captain's EFIS control panel
-First officer's EFIS control panel
-Instrument switching module.

Display Select Panels
The display select panels send 8 ground discretes to each EFIS control panel. These discretes show the positions of the main panel DU selector switch and the lower DU selector switch.
Engine Display Control Panel
The engine display control panel sends 16 ground discretes to each EFIS control panel. These discretes show the N1 SET, SPD REF, fuel used/reset switch and the ENG/SYSTEM switch selection status.
EFIS Control Panels
The EFIS control panels have inputs from the display select panels and the engine display control panel. The EFIS control panels convert these ground discretes to an ARINC 429 format. This discrete data and the EFIS control panel selection data is then sent to the display electronic units (DEU).
　
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