The EFIS control panel busses have this general data:
- Minimums data 
- FPV and MTRS switch status 
- Baro correction data 

-VOR 1/ADF 1 switch status -Mode selection data -Selected range data -TFC switch status -VOR 2/ADF 2 switch status -Weather on/off switch status -Map switches status -Terrain on/off switch status -Display select panel switch data -Engine display control panel switch data.
Instrument Switching Module
These are two switches in this panel:
-Display source select switch -EFIS control panel select switch.
The displays source select switch controls which DEU is supplying data to the DUs. It sends 3 ground discretes to each DEU to show switch position.
The EFIS control panel select switch determines which EFIS control panel is controlling the left and right PFD/ND displays. It sends 2 ground discretes to each DEU to show switch position.
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737-600/700/800/900 TRAINING MANUAL

31-62-00-103 Rev 1 06/09/2001
8 
DU SELECT 
8 
CAPT DISPLAY 
SELECT PANEL 
SPEED REF SLEW 
SPEED REF BUGS 
16 
N1 SET SLEW 
N1 SET BUG  16 
FUEL USED/RESET 
ENGINE/SYSTEM 
ENGINE DISPLAY 
CONTROL PANEL 
8 
DU SELECT 
8 
F/O DISPLAY 
SELECT PANEL 

EFCP BUS

CAPT EFIS
DEU 1

CONTROL PANEL 3
1/AUTO/2

DISPLAY SOURCE SELECTOR 2
1/NORM/2

CONTROL PANEL
SELECT SWITCH

EFCP BUS F/O EFIS DEU 2 CONTROL PANEL CDS - CONTROLS INTERFACES
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737-600/700/800/900 TRAINING MANUAL CDS -- CROSS CHANNEL INTERFACES THIS PAGE INTENTIONALLY LEFT BLANK
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CDS -- CROSS CHANNEL INTERFACES Cross Talk Bus
Each display electronic unit (DEU) sends data on two ARINC 429 high speed cross talk buses to the other DEU. The DEUs use two buses because there is too much data to update on one bus. Usually, the two buses have different data, but some data can be transmitted on both buses.
The cross talk buses have this data:
-DEU hardware part number
-OPS software part number
-OPC software part number
-Brake temperatures 1 - 4
-N1 bug drive data (engine 1 and 2)
-SWDL status
-CDS intra system maintenance data (BITE)
-DEU analog discrete status
- DEU discrete 1 
- DEU maintenance word 
- CP and DU maintenance word 
- Sensor status maintenance word 
- Mode discrete word 1 

-Display data
-DEU output bus data.

The DEU analog discrete status word has this data:
-Air data source selected -SMYD selected -DME selected -Mag/True status
737-600/700/800/900 TRAINING MANUAL
-Inertial data source selected -Comparator enable -ILS selected -Flight path management enable -Map source selected
- WXR source selected 
- VOR selected 
- FMC selected 
- MCDU selected 

-Navigation source -Air/ground status.
The DEU discrete word 1 has this data:
-Comparator fault -Roll comparator alert -Pitch comparator alert.
The DEU maintenance word has this data:
-IOP I -IOP A -Main processor 2 -Program pin parity -NV memory -RAM memeory -I/O processor 1 - 3 -Digital output -Controller -Display sequencer -Display drive -PROM memeory -Main processor 1
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CDS -- CROSS CHANNEL INTERFACES -Overtemperature.
The CP and DU maintenance word has this data:
-TCAS RA health
-TCAS system status.

The sensor status maintenance word has this data:
-WXR fault
-ILS fault
-RA fault
-DME fault
-VOR fault
-Air data fault
-Inertial reference data fault
-A/T fault
-FMC fault
-FCC fault.

The modes discrete word 1 has this data:
-L-WXR data fault
-R-WXR data fault
-L-ILS data fault
-R-ILS data fault
-LOB DU fault
-ROB DU fault
-L-MCDU fault
-R-MCDU fault
-L-SMYD fault
-R-SMYD fault
-DEU fault

737-600/700/800/900 TRAINING MANUAL

- RIB DU fault 
- LIB DU fault 
- L-EFIS CP fault 
- R-EFIS CP fault 
- CU DU fault 
- CL DU fault. 

The DEUs compare critical input signals that are received by both DEUs on the same ARINC 429 input bus. The onside values are compared with the offside values. If the critical comparison data is not the same, CDS shows CDS FAULT on the CDS displays.
This is the critical comparison data:
-Engine fan speed (N1)
-Engine core speed (N2)
　
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