User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
34−43−23
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Page 4−54
15 Dec 2005
Table 4−9. RCZ−852 Diversity Mode S Transponder Interface Descriptions (cont)
Connector Pin
Designation
Functional Description
J1−53 thru 58,
J1−67 thru 71
ENCODING ALTIMETER NO.1 ELEVEN BIT INPUT:
Transponder input from Encoding Altimeter No. 1. These eleven lines from the altitude
encoder comprise an 11−bit word representative of the aircraft altitude.
J1−59 ALT COMP ENA (NO) DISCRETE INPUT:
This discrete input enables or disables altitude comparison when dual Gillham altitude
sources are selected via the ALTITUDE SOURCE strap. If comparison is enabled (J1−59
Grounded), the two altitude sources (ENC ALT1 and ENC ALT2) are compared, and are
considered valid if they are within 500 feet. If the altitude comparison is enabled and it
fails, the altitude data is considered invalid in Mode S replies and altitude data sent to
TCAS. If comparison is disabled (J1−59 Open), only the selected altitude source is used.
This discrete has no effect if ARINC 429 or 575 altitude sources are used.
NOTE: For installations with TCAS that use Gillham encoding altimeter sources, two
encoding altimeter sources must be used, and pin J1−59 must be enabled
(Grounded).
J1−60 ALT SRC SEL2 (NO) DISCRETE INPUT:
This discrete input allows selection of one of two altitude sources. An Open causes the
transponder to use altitude source No.1, and a Ground causes the transponder to use
altitude source No.2. The altitude data sent to TCAS and used for transponder replies is
derived from the selected source.
J1−61 CTL SRC SEL1 (NO) DISCRETE INPUT:
This discrete input is used to select one of two ARINC 429 control tuning ports. A
Ground on this pin causes the transponder to use CTL1 TO XPDR bus for tuning data,
and an Open causes the transponder to use CTL2 TO XPDR bus for tuning data. The
input is used only when the transponder tuning source is an ARINC 429 source in a
stand−alone transponder system. When an RSB tuning source is used, the input is
ignored.
J1−64, 65 FMS TO XPDR ARINC 429 BUS INPUT: (J1−64 [A], J1−65 [B])
This differential pair input is a low speed ARINC 429 bus (12.5K bits/second nominal) that
receives basic transponder control data (label 031) and AIS flight ID (labels 233, 234,
235, and 236) from a Flight Management System (FMS).
J1−72 XPDR STANDBY (NO) INPUT:
This discrete input is connected to the Control Panel STANDBY/ON output. The input
selects the active or standby status of the transponder. A ground causes the transponder
to be in Standby, and an Open causes the transponder to be active. The input is used
only when the transponder tuning source is an ARINC 429 source in a stand−alone
transponder system. When an RCB tuning source is used, the input is ignored.
NOTE: If using a Collins CTL−92 Controller, this pin is not used.