(2)  
The data obtained from the interface is also processed by the EIUs for the generation of EICAS crew alerting and status messages.

 F. Environmental Control System (ECS) Interface (Fig. 67)
 (1)  
Digital inputs such as cabin master temperature, and selected and actual temperatures for specific zones are received by the EIUs on an ARINC 429 data bus from the Zone Temperature Controller (ZTC). This data is processed for display on the EICAS ECS synoptic and maintenance formats.

 (2)  
Digital inputs such as pack flow, turbine bypass valve (TBV) position and ram air inlet (RAI) door position are received by the EIUs on an ARINC 429 data bus from the Pack Temperature Controller (PTC). This data is processed for display on the EICAS ECS (air conditioning system) maintenance format.

 (3)  
Discrete digital inputs are received by the EIUs on an ARINC 429 data bus from the Equipment Cooling Card (EECOOL). These discrete inputs are processed by the EIUs for the generation of EICAS crew alerting and status messages.

 (4)  
Digital and analog data is received by the EIUs from the Cabin Pressure Control System (CPCS).

 (a)  Digital data such as cabin and landing altitude is processed for display on the EICAS primary and compacted formats, and the EICAS ECS (air supply and cabin pressure system) maintenance format.
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PORT 28 PORT 44 PORT 23 PORT 75
PORT 89 PORT 19
M7353 L-EIU (E2-6)
PORT 28 PORT 44 PORT 23 PORT 75
PORT 89 PORT 19
M7352 C-EIU (E2-6)
PORT 89 PORT 75 PORT 23 PORT 44 PORT 28 PORT 19
M7351 R-EIU (E2-6)
YMLA23 HYDRAULIC INTERFACE MODULE 4(M7603)
Hydraulic Interface
Figure 65

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(E2-6)
Electrical Interface Figure 66
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MAINTENANCE MANUAL

M7603 ELECTRONIC SYSTEM CARD FILE (STA 390) Environmental Control System (ECS) Interface Figure 67 (Sheet 1)
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CPCS-A-A-1

ANALOG
SIGNAL
PORT 3 PORT 39 PORT 59/40 PORT 96
M7353 L-EIU (E2-6)

ANALOG
SIGNAL
PORT 3 PORT 39 PORT 59/40 PORT 96
M7352 C-EIU (E2-6)
PORT 96
PORT 59/40 PORT 39 PORT 3

ANALOG
SIGNAL

M7351 R-EIU (E2-6)
-CABIN PRESSURE A
-LEFT OUTFLOW VALVE POSN -CABIN PRESSURE -ISO #5 TEXT MESSAGE FLANDING ALTITUDE -MISC EQUIP CONTROL -MAINT INFO -SRU FAULT TRANSFER
M7948 CABIN PRESSURE CONTROLLER A (E1-3)
-CABIN PRESSURE B
-RIGHT OUTFLOW VALVE POSN
SAME AS CABIN PRESSURE CPCS-B-B-1 CONTROLLER A
M7949 CABIN PRESSURE CONTROLLER B (E2-3)
-BLEED AIRFLOW SNSR -ENGINE BLEED PRES -ENGINE BLEED TEMP ASCTU-L/R-A-1/2
-L, R MANIFOLD PRES -EICAS MESSAGE -MAINT MESSAGE
M7957 AIR SUPPLY CONTROL AND TEST UNIT (E2-4)
-BOARD INFO
-MAINTENANCE INFO
　
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