User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
34−43−23
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Page 4−10
15 Dec 2005
Table 4−1. TCAS 3000 Computer Unit Loading/Gradient Specifications (cont)
Connector Pin
Designation
Functional Description
RMP−12C RA/TA Block Transfer Program Input (NO)
This program input determines the type of block transfer that is made from the TCAS
computer unit to the TA/RA displays. If this pin is grounded, the TCAS computer unit
transmits in ACSS BCA EFIS format. If the TCAS computer unit senses an open at this
pin, it transmits in ARINC 735 format.
RMP−12D Reserved Program Input
RMP−12E Reserved Program Input
RMP−12F Spare Pin
RMP−12G Option Parity Program Input
The TCAS computer unit uses nine discrete program input pins to determine which
options have been selected by the installer. Eight of these pins are used to determine
option selections. The ninth pin (RMP−12G) is used to determine parity for the eight
option selection pins (RMP−10G, −10H, −10J, −10K, −11A, −11B, −11C, and −11D). To
determine parity, count the number of option pins that are grounded. If the number of
pins that are grounded is an odd number (1, 3, 5, 7), ground pin RMP−12G. If the
number of grounded pins in the option group is an even number (0, 2, 4, 6, 8), leave pin
RMP−12G open.
RMP−12H Analog Radio Altimeter Type Select Program Input No. 3 (NO)
See RMP−12B.
RMP−12J Analog Radio Altimeter Type Select Program Input No. 2 (NO)
See RMP−12B.
RMP−12K Analog Radio Altimeter Type Select Program Input No. 1 (NO)
See RMP−12B.
RMP−13A, 13B RA Display No. 1/ARINC 429 Data Recorder Output: [RMP−13A (A), RMP−13B (B)]
These ARINC 429 outputs are configured to output either RA information or for use as an
ARINC 429 data recorder function. The output is configured by program pin RMP−11D.
When RMP−11D is open (standard configuration), the bus is configured for low−speed
ARINC 429 operation and RA information is output according to the format specified for
the RA display bus in ARINC 735. When RMP−11D is grounded, the bus is configured for
high−speed ARINC 429 operation and the output supplies TA and RA information to a 429
data recorder.
RMP−13C, 13D RA Display No. 2/ARINC 429 Data Recorder Output: [RMP−13C (A), RMP−13D (B)]
See RMP−13A.
RMP−13E RA Display No. 2 Status Discrete Input (NO)
This input provides the functional status of RA Display No. 2. A ground on this pin
indicates a valid display. If this discrete is not used by the RA Display, connect to aircraft
ground to prevent RA DISPLAY No. 2 fail message during self−test.