User's Manual Part 2

ManualsBrandsACSS an L-3 Communications and Thales ManualsElectronicsTCAS

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--44

Table 4--5. RCZ--852 Diversity Mode S Transponder Interface Description

Connector Pin

Designation

Functional Description

J1--1, 2 XPDR +28 Vdc FAN PWR and +28Vdc FAN RTN: (J1--1 LOW, J1--2 HIGH)

The fan discrete outputs supply a switched, filtered +28 Vdc for a dc fan. The RCZ--852

T ransponder 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 Vdc RTN:

See pins 8, 9.

J1--8

J1--9

XPDR +28 Vdc 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 Vdc (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 Vdc 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

and ARINC 735A 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 standard for ADLP to transponder interface.