User's Manual Part 1

CAS / Part No. 9000000

SYSTEM DESCRIPTION AND INSTALLATION MANUAL

34-43-20

15 Feb 2003

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1--29

Voice Audio Outputs

The TCAS function contains two analog audio outputs that provide TCAS

aural traffic advisories and resolution advisories. The 8--ohm output has the

capability to supply up to 8 Watts RMS into a speaker. The 600--ohm output

has the capability to supply up to 80 milliwatts RMS into an audio distribution

system.

RS -- 232 Interface

The TCAS function has an RS--232 input/output for connection to a personal

computer. The interface allows for LRU maintenance and troubleshooting.

The maintenance log and RA event log can also be downloaded to a PC

using this port. The RS--232 interface is connected to the 53-- pin PDL

connector on the front of the unit.

Altitude Alerter Interface

The TCAS function contains an ARINC 429 low speed input bus that is

reserved for receiving selected altitude information from an altitude control

source or flight control computer. The TCAS function uses the selected

altitude information to inhibit the weakening of a resolutio n advisory by

determining the selected altitude limits for the aircraft.

Reserved ARINC 429 Bus Interface

The TCAS function has four sets of reserved ARINC 429 input buses

configured as either high speed or low speed. These buses allow for future

upgrades to the TCAS system without hardware modification.

Onboard Maintenance System Interface

The TAWS/RWS function contains a set ASDB defined ARINC 429 low

speed buses for communication with an onboard maintenance system (1

input, 1 output). The unit interfaces with all major airframe manufacturers

maintenance computer systems. Since the maintenance computer protocol

for each airframe manufacturer is different, the T

CAS computer uses

information from the Aircraft Personality Module (APM) to determine what

OMS system, if an y, is insta lled.

Data Loader Interface

The TAWS/RWS function is provisioned for interface with an ARINC 615A

data loader (Ethernet 10 Base--T). The front Portable Data Loader

connector contains the signals required by the ARINC 615A specification.

The interface will be used to upload future software updates to the

TAWS/RWS system.