The SG-884 Symbol Generator (SG) functions as the data processor for the
display system.
It receives digital and discrete inputs, organizes this
information into the correct formats as defined by the DC-884 Display
Controller, and transmits these formats to the DU-880 Display Units. The
SG is also used as the bus controller for the system and also outputs
data over the ASCB to other components in the system as specified
in
Table 6-3.
Table 6-3.1 lists the ASCB transmitted data changes when
using the -904 Symbol Generator for the TCAS and MLS option.
The SG contains provisions to drive six display units simultaneously,
with four independent formats.
This requirement exists to provide for
redundancy in the event of an SG failure.
The available formats that the
SG is capable of creating include:
. Primary Flight Display Format
. Map Format
● Plan Format
● Compass Format
● Engine Instrument Format
● System Display/CautionAdvisory Format
● Compacted Engine Format
The symbol generators in the display system are identical and directly
interchangeablee. When the display system is in its normal (no failure)
configuration, SG1 drives the pilot’s displays,
SG2 drives the copilot’s
displays, and SG3 drives the EICAS displays.
The symbol generators interface with the following components, and a
description of each interface is provided in the following paragraphs:
DC-884 Display Controller
FC-880 Fault Warning Computer
DA-884 Data Acquisition Unit
FZ-820 Flight Guidance Computer
NZ-920 Navigation Computer
AZ-81O Digital Air Data Computer
Inertial Reference System
Navigation Sensors
Joystick
PZ-800 Performance Computer
LASERTRAKW
22-14-00
Page 157
Apr 15/93
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