User's Manual Part 2

T
2
CAS / Part No. 9000000
SYSTEM DESCRIPTION AND INSTALLATION MANUAL
34-43-20
15 Feb 2003
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4--55
• Types of data or information which is processed by the input or generated by the
output. Example: GPS#1 has the following ARINC 429 labels: 100, 101, etc..
• Input or output timing characteristics such as time-- out periods or output rates.
Example: Label 100 must be received every 2 seconds for it to be valid.
• Da ta processing characteristics which define specific types of processing which
may be performed on each input or output. This includes an example of the
following types of options:
-- Method of storage (single or ping-- pong buffer)
-- Digital filter option (low--pass filter received data with a specified cut--off
frequency based on parameters in the tables)
-- Extrapolation option (extrapolate data at a given interval based on previous
samples received)
-- Sequence number option (example, process 310 Latitude and 311 Longitude
as a pair)
-- Push--button option (look for a transition from 0 to 1 in the data)
• Conversion code and parameters which specify how to process the data.
Examples: 1) Decode Label 310 as a BNR (binary) number with a MSB of 90
degrees. 2) Multiply analog radio altitude voltage by a parameter (scale factor) to
get feet.
• Non--standard conversion parameters. The conversion code in 5) provides a
standard set of conversion operations which can handle many types of inputs and
outputs. However for more complex types of conversions, the non--standard
conversion allows for a number of operations to be performed on the data.
Operations which may be performed include mathematical, comparison and
branching.
• A parameter which is used to determine the location in RAM where the input data
is stored after processing, or data is read prior to output. This allows I/O data to
be mapped into the correct memory locations where GCAM can access it.
(2) APM
The T
2
CAS uses an Airplane Personality Module (APM) to hold aircraft specific
configuration data for TAWS and RWS functions. The APM is used in place of
program pin inputs to provide system configuration. The APM is in an ARINC 607
Type II form factor, and is mounted to the aircraft a s part of the installation. It retains
configuration data if a T
2
CAS LRU is removed and replaced with a new LRU serial
number.
The APM contains two types of data:
• Aircraft Type Data
• Installation Option Data