CDS -- EXTERNAL INTERFACE INTRODUCTION
-CDS EFIS CP modes 2 discrete word -TCAS RA status -TCAS system status -BITE response data.
The CDS EFIS CP modes 1 discrete word has this data:
-TFC selected -Center display format -Baro minimums aural enable -VOR left selected -VOR right selected -ADF left selected -ADF right selected -Heading up map format -Airports selected -Route data selected -Waypoints selected -Navaid data selected -Position data selected -PFD/ND display format -Plan mode selected -Approach mode selected -VOR mode selected -Map mode selected.
The CDS EFIS CP modes 2 discrete word has this data:
- Baro minimums selected 
- RA health 
- GPWC V1 callout enable 
- FPV selected 
- Meters selected 

737-600/700/800/900 TRAINING MANUAL

- STD selected 
- HPA selected 
- HG selected 
- Terrain selected 
- WXR selected. 

The FMCS uses this data:
-CDS EFIS CP 1 discrete word data
-CDS EFIS CP 2 discrete word data
-BITE response data.
The BITE response data is for these LRUs:
-DEUs
-EECs
-APU.
EEC/APU Bus
The DEUs send data to the main engine electronic engine control (EEC) and APU electronic control unit (ECU) on the EEC/APU bus. Only DEU 1 sends data to the APU ECU.
The EEC/APU bus has this data:
-Flight number
-Baro corrected altitude
-Mach number
-Total air temperature
-Total pressure
-Static pressure
-Time/date

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31-62-00

CDS -- EXTERNAL INTERFACE INTRODUCTION -Target N1
- ADR discrete word 
- CDS DEU discrete word 1 
- CDS DEU discrete word 2 
- CDS DEU discrete word 3 
- BITE test word. 

The ADR discrete word has this data:
-Angle of attack data
-SSEC data
-VMO/MMO data
-Overspeed warning status
-Antice system status
-ADR fail status.
The CDS DEU discrete word 1 has this data:
-Engine running status
-Engine start valve status
-Main landing gear position status
-Flaps position data.
The CDS DEU discrete word 2 has this data:
-Engine alternate mode select status
-Engine start lever position status
-Engine ignition switch status
-Engine start switch position status.
The CDS DEU discrete word 3 has this data:
-ECS isolation valve status
737-600/700/800/900 TRAINING MANUAL

-ECS pack status -ECS pack flow status -Antice status -Engine bleed switch status -Flap position data -Air/ground system status.
Engine EEC Bus
The DEUs send EEC data on the engine EEC buses. The DEUs send all the labels received from the four EEC buses to the main engine test connectors in the EE compartment. EEC channel A data comes from DEU 1 and EEC channel B data comes from DEU 2.
The engine EEC bus has this general data:
-EEC data -Manufacturer and configuration data -Thrust rating/airplane model data -Exceedance data -Internal protection status -Engine internal sensing data -Fuel system status -Oil system status -Engine air systems status data
- Maintenance data 
- TRA data 
- Thrust reverser status data 

-ADIRU input data status.
31-62-00

737-600/700/800/900 TRAINING MANUAL CDS -- EXTERNAL INTERFACE INTRODUCTION ACARS Datalink Bus
The DEUs send data on the ACARS datalink bus to the ACARS system. This is a customer configured system.
Analog Discrete Outputs
These are the discrete outputs from the DEUs:
-TCAS display status to the TCAS computer
-Weather radar (WXR) on/off signal to the WXR

control panel
-Generator control unit (GCU) enable discrete
-Fuel filter bypass annunciator discretes to the

fuel system panel
-BITE power up discrete to the APU ECU
-Engine start switch hold discretes to the engine

start switches
-Engine control annunciator discretes to the engine
control module
-Discretes to the engine alternate (ALT) power
(PWR) relays

-Discretes to the engine running relays when the
engine is running or the start levers are in idle
for longer than 5 minutes.

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737-600/700/800/900 TRAINING MANUAL

31-62-00-105 Rev 1 06/27/2001

FLIGHT CONTROL COMPUTERS A, B FLIGHT DATA ACQUISITION UNIT STALL MANAGEMENT YAW DAMPER 1, 2 CDS TEST CONNECTOR (E4 RACK)
AIR DATA INERTIAL REFERENCE UNIT 1 GROUND PROXIMITY WARNING COMPUTER WEATHER RADAR TRANSCEIVER
AIRPLANE SYSTEMS NAVIGATION SYSTEMS INDICATING AND RECORDING SYSTEMS AUTOPILOT SYSTEMS FLIGHT CONTROLS SYSTEMS HYDRAULIC SYSTEMS LANDING GEAR SYSTEMS AIR CONDITIONING SYSTEMS PNEUMATIC SYSTEMS FUEL SYSTEMS ELECTRICAL SYSTEMS ICE AND RAIN PROTECTION SYSTEM ENGINE SYSTEMS APU SYSTEMS COMMUNICATION SYSTEMS
　
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