User's Manual

Table Of Contents
SYSTEM DESCRIPTION AND INSTALLATION MANUAL
T
3
CAS/Part No.9005000
Table 4-2: T
3
CAS Computer Unit Interface Description
(Applicable to Part No. 9005000-11801 and -55801)
Connector
Pin
Designation
Functional Description
RMP-13H,
13J
Radio Altimeter No.1 (Left) Input: [RMP-13H (A), RMP-13J (B)]
This input is provided for low-speed ARINC 429 (12.5k bits/s) altitude inputs from an
ARINC 707 digital radio altimeter. Radio altitude data is used for computation of
sensitivity level, inhibit descend advisories, inhibit aural annunciation when in close
proximity to the ground and for TAWS reactive modes. See RMP-2H.
RMP-13K
TCAS System Valid Discrete Output (NO)
This ground/open-type discrete output (Note 3) indicates the health status of the
T
3
CAS computer unit to other avionics systems that monitor TCAS system status.
This output is used in retrofit installations where instrumentation needs to monitor
TCAS status and the status is not available across an A429 bus. A ground at this
pin indicates normal TCAS operation. An open indicates a TCAS fault.
RMP-14A,
14B
Reserved: ARINC 429 Bus Output
RMP-14C
RA Display No.1 Status Discrete Input (NO)
This ground/open discrete input (Note 1) provides the functional status of RA
Display No.1. A ground on this pin indicates a valid display. If this discrete is not
provided by the RA display, connect to aircraft ground to prevent RA DISPLAY No.1
fail message during self-test.
RMP-14D,
14E
Reserved: ARINC 429 Input
RMP-14F,
14G
ARINC 429 XT Coordination No.1 Input: [RMP-14F (A), RMP-14G (B)]
This differential pair input is a high-speed ARINC 429 bus (100k bits/second
nominal), that receives data from the No.1 Mode S Transponder.
RMP-14K
Reserved: GND/OPEN Discrete Input
RMP-15A,
15B
Reserved: ARINC 429 Output Bus
RMP-15C,
15D
ARINC 429 Input: MMR/GPS #2 (Right) [RMP-15C (A), RMP-15D (B)]
This high-speed 429 input is used to receive GPS label input containing position,
velocity and quality information for the use of ADS-B IN applications and by the
transponder function for ADS-B Out.
RMP-15E
Thru
RMP-15H
Reserved: TAWS/RWS ARINC 429 Output
RMP-15J,
15K
ARINC 429 TX Coordination No.1 Output: [RMP-15J (A), RMP-15K (B)]
This differential pair output is a high-speed ARINC 429 bus (100k bits/second
nominal), that transmits data from the T
3
CAS computer unit to the No.1 Mode S
Transponder.
Pub. No. 8600200-001, Revision 004
34-45-29
4-57
04 Nov 2014
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