User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
34−43−23
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Page 4−52
15 Dec 2005
Table 4−9. RCZ−852 Diversity Mode S Transponder Interface Descriptions
Connector Pin
Designation
Functional Description
J1−1, 2 XPDR +28 V FAN PWR & +28V FAN RTN: (J1−1 LOW, J1−2 HIGH)
The fan discrete outputs supply a switched, filtered +28 volts for a dc fan. The RCZ−852
Transponder has an internal fan built into the unit, so external cooling is not required.
Pins J1−1 and J1−2 should not be connected.
J1−3 MUTUAL SUPPRESSION BUS I/O:
This bus is a single conductor, shielded bidirectional line that connects to all aircraft
L−Band equipment. It is used to desensitize the associated receiver inputs while
transmitting.
J1−7 XPDR +28 V RTN:
See pins 8, 9.
J1−8
J1−9
XPDR +28 V PWR:
These pins along with there return lines (J1−7 and J1−20) provide the 28 volt power
requirements for the transponder.
J1−11 PROGRAM ENABLE INPUT:
Bench test function. Do not connect this pin in aircraft installations.
J1−12 XPDR RS232 TX OUTPUT:
Bench test function. Do not connect this pin in aircraft installations.
J1−17, J1−18
J1−19, J1−21
DC GROUND INPUT:
To be connected to aircraft dc ground.
J1−23 XPDR VALID (PO) OUTPUT:
This discrete outputs the status of the transponder continuous monitor tests. It is the
same as the XPDR VALID (NO) output (J1−100) except the discrete is a positive/open
logic. A +28 V dc (200 mA maximum) is provided when the transponder is operational
and an active transponder mode is selected. An Open (>100K ohms resistance to
ground) output is provided when the transponder has failed or the standby mode is
selected.
J1−24 XPDR RS232 RX INPUT:
Bench test function. Do not connect this pin in aircraft installations.
J1−25 PROGRAM +15 V OUTPUT:
Bench test function. Do not connect this pin in aircraft installations.
J1−26, 27 XPDR TO TCAS ARINC 429 BUS OUTPUT: (J1−26 [A], J1−27 [B])
This differential pair output is a high speed ARINC 429 bus (100K bits/second nominal)
that sends data to the TCAS computer unit. The data bus conforms to the ARINC 718−A
and ARINC 735 standards for TCAS to transponder interface.
J1−28, 29 XPDR TO DLP A/B ARINC 429 BUS OUTPUT: (J1−28 [A], J1−29[B])
This differential pair output is a high speed ARINC 429 bus (100K bits/second nominal)
that sends data to an airborne data link processor (ADLP) system. The data bus is used
to transfer COMM−A and COMM−B messages between the two systems and conforms to
the ARINC 718−A standard for ADLP to transponder interface.