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(c)
The following is an example of how to determine the program pin states from a hexadecimal readout of 4511 0000 8810 00. Using the above table, the first four hexadecimal numbers (4511) are converted to program pin numbers one through sixteen as follows:
~............................................................. | HEXADECIMAL | 4 | 5 | 1 | 1 | ............................................................... | 4-BIT BINARY | 0 1 0 0 | 0 1 0 1 | 0 0 0 1 | 0 0 0 1 | ............................................................... | PROGRAM PIN | 1 2 3 4 | 5 6 7 8 | 9 10 11 12 | 13 14 15 16 | 2..............….........….........…............….............1
(d)
Program pin numbers 2, 6, 8, 12 and 16 are enabled. All other program pins are disabled. In the above example, the status of program pin numbers seventeen through fifty six would be determined by converting the ten remaining hexadecimal numbers (0000 8810 00) in the same manner as demonstrated above.
G. Raster Patches
(1) Simulated raster patches are provided for each of the three color guns. The raster patches are used for display brightness testing and are not controlled by the manual brightness controls.
H. Convergence Crosses
(1) Nine convergence crosses are provided to validate proper coordinate positioning of the three color guns.
I. Standard Character Set
(1) All available characters stored in the character PROM for all three character sizes are displayed. The blank or space character appears after the decimal point following the 9 symbol.
15. EICAS Interface_______________
A. Doors Interface (Fig. 62)
(1)
Door position information is received by the EIUs as direct analog discrete inputs.
(2)
These discrete signals are generated by door position switches. These signals designate the latched or unlatched state of the doors.
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S34 R-ENTRY DR 1 WARNING SW STA 480R S29 L-ENTRY DR 1 WARNING SW STA 480L S35 R-ENTRY DR 2 WARNING SW STA 854R S30 L-ENTRY DR 2 WARNING SW STA 854L S36 R-ENTRY DR 3 WARNING SW TB 210,
STA 1265
S31 L-ENTRY DR 3 WARNING SW TB 209, STA 1265 S37 R-ENTRY DR 4 WARNING SW STA 1718R S32 L-ENTRY DR 4 WARNING SW STA 1718L S38 R-ENTRY DR 5 WARNING SW STA 2285R S33 L-ENTRY DR 5 WARNING SW STA 2285L S39 R-UPPER DECK DR WARNING SW STA 712R S1170 L-UPPER DECK DR WARNING SW STA 668L M709 FWD CARGO DR WARNING SW STA 615 M711 AFT CARGO DR WARNING SW STA 1865 S43 AFT BULK CARGO DR WARNING SW STA 1980 S44 MN ELEC RACK SVCE DR WARNING SW
STA 420
S616 CTR ELEC RACK SVCE DR WARNING SW STA 810 S1521 UPPER DECK FLIGHT LOCK SW STA 690
M7351 R-EIU (E2-6)
Door Interface
Figure 62
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(3) The analog signals are processed by the EIUs and are used to generate EICAS messages. These EICAS messages indicate unlatched doors to the flight crew. Door interface data is also used for the generation of the EICAS door synoptic display.
B. Gear Interface (Fig. 63)
(1)
Gear and gear door position information is received by the EIUs on an ARINC 429 digital data bus from the Proximity Switch Electronics Unit (PSEU). This data is processed by the EIUs for display on the EICAS primary and compacted formats, and the EICAS gear synoptic and maintenance formats.
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