User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
34−43−23
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Page 4−36
15 Dec 2005
Table 4−6. 55−Pin VSI/TRA Interface Descriptions
Connector Pin
Designation
Functional Description
J1−1, 6 SECONDARY ARINC 565 VERTICAL SPEED BUS INPUT: [J1−6 (HI), J1−1 (LO)]
This two wire bus input receives ARINC 565 vertical speed data from the cross−side
display when the bootstrap mode is activated. This bus input is connected to the R/C
Bootstrap Output bus on the cross−side display as follows:
J1−6 of the on−side display is connected to J1−14 of the cross−side display.
J1−1 of the on−side display is connected to J1−13 of the cross−side display.
J1−2 VERTICAL SPEED DC RATE INPUT:
Pins 2, 3 and 8 are inputs to the VSI/TRA from an ARINC 575 air data computer
indicating vertical speed. Pin 2 receives a +10 to −10 V dc rate signal from the ADC. Pin
3 is a −12 V dc regulated reference voltage from the ADC and pin 8 is a +12 V dc
regulated reference voltage from the ADC. Also see pins 29, 31, 32, and 33.
J1−3 VERTICAL SPEED −DC REFERENCE INPUT:
See pin 2.
J1−4 BOOTSTRAP REFERENCE OUTPUT:
This output sends the bootstrap ARINC 565 ac reference voltage to the cross−side
display. The output is connected to the Secondary 26 V ac Reference Input (pin 7) of the
cross−side display.
J1−5 VERTICAL SPEED NO. 2 VALID DISCRETE INPUT:
This discrete input receives bootstrap ARINC 565 vertical speed valid data from the
cross−side display. The input is connected to the Vertical Speed Output
(pin 49) of the cross−side display.
J1−7 SECONDARY 26 V ac REFERENCE INPUT:
This input receives the bootstrap ARINC 565 ac reference voltage from the cross−side
display. The input is connected to the Bootstrap Reference Output (pin 40) of the
cross−side display.
J1−8 VERTICAL SPEED +DC REFERENCE INPUT:
See pin 2.
J1−9 PRIMARY VERTICAL SPEED 26 V ac, 400 HZ REFERENCE INPUT:
See pins 10, 11.
J1−10, 11 PRIMARY VERTICAL SPEED ARINC 565 AC INPUT: (J1−11 HIGH, J1−10 LOW)
Pins 9, 10, 11, and 12 are inputs to the VSI/TRA from an ARINC 565 air data computer or
IRS. A 26 V ac, 400 Hz reference signal is received on pin 9 (HI). Pin 11 (HI) and pin 10
(LO) provide an amplitude modulated 400 Hz signal with a maximum voltage of " 6.25
volts. The RMS value of this signal is used by the VSI/TRA to compute and display the
vertical rate. The phase of this signal is compared with the reference signal to determine
if the rate is positive or negative. An in−phase equals a positive rate, an out−of−phase
signal indicates a negative rate. Also see pins 12, 29, 31, 32, and 33.