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* 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).
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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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
* 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
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* Main processor 1
* Overtemperature.
The CP and DU maintenance word has this data:
* TCAS RA health
　
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