User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
34−43−23
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Page 4−53
15 Dec 2005
Table 4−9. RCZ−852 Diversity Mode S Transponder Interface Descriptions (cont)
Connector Pin
Designation
Functional Description
J1−30,31 XPDR TO DLP C/D ARINC 429 BUS OUTPUT: (J1−30 [A], J1−31 [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−C and COMM−D messages between the two systems and conforms
to the ARINC 718−A standard for ADLP to transponder interface.
J1−32, 33 ADC1 TO XPDR ARINC 429/575 BUS INPUT: (J1−32 [A], J1−33 [B])
This differential pair input is a low speed ARINC 429 or 575 bus that inputs uncorrected
pressure altitude (ARINC label 203) from an altitude source. The input accepts either
ARINC 429 or 575 data format, which is selected by the altitude source straps (W33,
W34) on the Strap Assembly. The ALT SRC SEL2 (NO) discrete, pin 60, selects either
ADC1 or ADC2.
J1−34, 35 CTL1 TO XPDR ARINC 429 BUS INPUT: (J1−34 [A], J1−35 [B])
The transponder can receive data from the control panel(s) on the CTL1 TO XPDR and
CTL2 TO XPDR data busses. The bus used, is selected by the CTL SRC SEL1 (NO)
DISCRETE. See pin 61. The data bus not selected will not be processed. These
differential pair inputs are low speed ARINC 429 busses (12.5K bits/second nominal) that
transmits tuning information from the control panel to the transponder. The transponder
expects to receive ARINC labels 016 and 031 at an update rate of 100 to 200
milliseconds. Also see CTL2 TO XPDR ARINC 429 bus input (pins 48 and 49).
J1−40, 41 TCAS TO XPDR ARINC 429 BUS INPUT: (J1−40 [A], J1−41 [B])
This differential pair input is a high speed ARINC 429 bus (100K bit/second nominal) that
receives data from a TCAS computer unit. The data bus conforms to the ARINC 718−A
and ARINC 735 standards for TCAS to transponder interface.
J1−42, 43 DLP A/B TO XPDR ARINC 429 BUS INPUT: (J1−42 [A], J1−43 [B])
This differential pair input is a high speed ARINC 429 bus (100K bits/second nominal) that
receives data from 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.
J1−44, 45 DLP C/D TO XPDR ARINC 429 BUS INPUT: (J1−44 [A], J1−45 [B])
This differential pair input is a high speed ARINC 429 bus (100K bits/second nominal) that
receives data from an airborne data link processor (ADLP) system. The data bus is used
to transfer COMM−C and COMM−D messages between the two systems and conforms
to the ARINC 718−A standard for ADLP to transponder interface.
J1−46,47 ADC2 TO XPDR ARINC 429/575 BUS INPUT: (J1−46 [A], J1−47 [B])
See pins J1−32, 33
J1−48, 49 CTL2 TO XPDR ARINC 429 BUS INPUT: (J1−48 [A], J1−49 [B])
See pins J1−34, 35
J1−50, 51 XPDR TO CTL ARINC 429 BUS OUTPUT: (J1−50 [A], J1−51 [B])
This differential pair output is a low speed ARINC 429 bus (12.5K bits/second) that
transmits control panel input data back to the control panel for verification purposes.
These output pins are connected only on some Collins control panels that require
feedback from the transponder to make sure it is operating properly.