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--25
Table 4--1. TT--950/951/952 T
2
CAS Computer Unit Interface Description (cont)
Connector Pin
Designation
Functional Description
J1--44 GPS RS--232 Data Input
This input is used by the GPS function to receive RS--232 data from a portable
maintenance terminal.
J1--45 GPS RS--232 Data Output
This output is used by the GPS function to transmit RS--232 data to a portable
maintenance terminal.
J1--46
Thru
J1--47
Spare Pins
J1--48,
J1--49
Logic Common
Common lines for the RS--232 Data Input/Output lines. These two pins are tied together
in the T
2
CAS computer unit.
J1--50 Reserved Pin
J1--51 Data Loader Link No. 2 Discrete Input
Pins J1--51 and J1--52 are ground/open discretes from a portable data loader, which are
used to specify what type of data loader (ARINC 603 or ARINC 615) is connected to the
T
2
CAS computer unit. These two pins are also connected to the ARINC 600 connector
on the rear of the unit (RBP--6B and --6C respectively).
J1--52 Data Loader Link No. 3 Discrete Input
See J1--51.
J1--53 Data Loader Link No. 4 Discrete Input
This is a ground/open discrete from a Portable Data Loader (PDL) that is used to transmit
the software part number on the Data Loader output bus when grounded, The landing
gear indicates extended, and the air/ground indicates ground. This pin is also connected
to the ARINC 600 connector on the rear of the unit (RBP--6D).
NOTE: 1: Ground = Voltage of 0.0 Vdc to +3.5 Vdc or Resistance of less than 10 Ohms
applied to input.
Open = Voltage of +18.5 to +36 Vdc or Resistance greater than 100k Ohms
applied to input.
NOTE: 2: The Antenna Coax shall be RG225 or equivalent coaxial cable that provides a
loss of 2.5 db ± 0.5 db or less between the T
2
CAS computer and each TCAS
Antenna port. For Directional Antenna Coaxes, each coax cable must be within
0.5 db of the other coaxes (e.g. if one port has a 2 db loss, the o ther 3 ports can
not exceed 2.5 db loss).
NOTE: 3: Ground = Port capable of sinking at least 20 milli--Amps of current.
Open = Voltage of +18.5 to +36 Vdc or Resistance greater than 100k Ohms
applied to output.