User's Manual Part 2

T
2
CAS / Part No. 9000000
SYSTEM DESCRIPTION AND INSTALLATION MANUAL
34-43-20
15 Feb 2003
Use or disclosure of information on this page is subject to the restrictions in the proprietary notice of this document.
4--11
Table 4--1. TT--950/951/952 T
2
CAS Computer Unit Interface Description (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 T
2
CAS
computer unit to the TA/RA displays. If this pin is grounded, the T
2
CAS computer unit
transmits in Honeywell BCA EFIS format. If the T
2
CAS computer unit senses an open at
this pin, it transmits in ARINC 735 format.
RMP--12D Aircraft Type 1 Program Input
This program pin is used with pin RMP--12E to designate the aircraft manufacturer (Air
T ransport customers only) for maintenance support functionality. The aircraft
manufacturer is determined as follows:
RMP--12D RMP--12E Description
Open Open All other airframes including BCA aircraft
Open Ground Boeing
Ground Open McDonnell Douglas
Ground Ground Airbus
RMP--12E Aircraft Type 0 Program Input
See RMP--12D.
RMP--12F Reserved Program Input
Reserved for future use.
RMP--12G Option Parity Program Input
The T
2
CAS 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.