ARINC 735A-1 : 2003

1.0 Introduction and Description
1.1 Purpose of this Document
1.2 System Description
1.3 TCAS
1.4 Unit Description
1.5 Altitude Reporting Data
1.6 Interchangeability
1.7 Regulatory Approval
2.0 Interchangeability Standards
2.1 Introduction
2.2 Form Factor, Connectors and Index Pin Coding
2.3 Interwiring
2.4 Power Circuitry
2.5 Environmental Conditions
2.6 Cooling
2.7 Grounding and Bonding
2.8 Standardized Signaling
3.0 TCAS Functional Description
3.1 Voice and Visual Annunciator Outputs
3.2 Aircraft Interfaces
3.3 TCAS Interface with Mode S Transponder
3.4 TCAS Displays
3.5 Discrete Signals
3.6 Program Pins
3.7 Test Pins
4.0 Functional Test, Monitoring and Built-in Test Equipment (BITE)
4.1 TCAS Functional Test
4.2 Indicator Response
4.3 Integrity Monitor Display
4.4 Built-In Test Equipment (BITE)
4.5 BITE Display
4.6 Fault Monitor
4.7 BITE Initiation
4.8 Monitor Memory Output
4.9 Provisions for Automatic Test Equipment
5.0 Antennas
5.1 Omnidirectional Antenna
5.2 Directional Antenna
5.3 Environmental Considerations
5.4 D-Band Systems Physical Isolation
5.5 Antenna Installation
5.6 Antenna and Cable Characteristics
5.7 Anti-Icing
6.0 VSI/TCAS Display
6.1 Standard VSI/TCAS Display
6.2 Alternative TCAS Display Indicators
6.3 Integral Lighting
6.4 Environmental Conditions
7.0 Simulator Installation
7.1 Use in Simulators
Attachments
1A TCAS/Dual Mode S Architecture
1B TCAS/Dual Mode Intra System Data Link Diagram
1C-1 TCAS Display and Annunciation Interface Diagram
1C-2 TCAS Display and Annunciation Interface Diagram
1D TCAS/Dual Mode S Power Input Configuration Diagram
1E TCAS Input Signal Diagram
1F TCAS Output Signal Diagram
1G TCAS Program Pin Signal Diagram
2 TCAS Computer Unit Connector Positioning
3A Standard Interwiring
3B Notes Applicable to the Standard Interwiring
4 TCAS Computer Unit Connector Insert Layout
5A Mode A Reply Code Combination
5B ATCRBS Reply Code Pulse Characteristics
6 Data Words Applicable to RTCA/DO-185
6A ARINC 429 Data Bus Interface Definition
6B Coordination Data Bus Definition
6C DITS Control Word for TCAS (and Mode S Transponder)
6D DITS Control Word for TCAS, Mode S Transponder and TA/RA Displays
6E TCAS Vertical RA Data Output Word
6F Reserved for TCAS Horizontal RA Data Output Word
6G TCAS Traffic Advisory, Intruder Range Word
6H TCAS Traffic Advisory, Intruder Altitude Word
6J TCAS Traffic Advisory, Intruder Bearing Estimate Word
6K Standard ARINC 429 Format for Bus 1 Word 2 - Transponder to TCAS
       TCAS Coordination Data (Mid Part 1)
6L Standard ARINC 429 Format for Bus 1 Word 8 - Transponder to TCAS
       TCAS Coordination Data (Mid Part 2)
6M Standard ARINC 429 Format for Bus 1 Word 3 - Transponder to TCAS
       Mode S Ground Uplink (SCL, IIS)
6N Standard ARINC 429 Format for Bus 1 Word 4 to TCAS
       and TA/RA Display - Transponder and TCAS Outputs
6P Standard ARINC 429 Format for Bus 1 Word 5 - Transponder to
       TCAS TCAS Control Data (Mode S Address Part 1)
6Q Standard ARINC 429 Format for Bus 1 Word 6 - Transponder to
       TCAS TCAS Control Data (Mode S Address Part 2, Max A/S)i
6R Standard ARINC 429 Format for Bus 1 Word 7 - Transponder to TCAS
       Acknowledgement (ACK/NACK)
6S Standard ARINC 429 Format for Bus 1 Word 1 - Transponder to TCAS
       TCAS Coordination Data (MTB, CVC, VRC, CHC, HRC, HSB, VSB)
6T Standard ARINC 429 Format for Bus 2 Word 1 - TCAS to Transponder
       and to Displays - TCAS Output (ARA, RAC)
6U Standard ARINC 429 Format for Bus 2 Word 2 - TCAS to Transponder
       and Displays - TCAS Output (SL, RI)
6V Standard ARINC 429 Format for Bus 2 Word 3 - TCAS to Transponder
       and Displays - Acknowledgement (ACK/NAK)
6W Standard ARINC 429 Format - FMS to TCAS
6X Altitude Select Limits Word
6Y TCAS Fault Summary Word
6Z-1 TCAS Display Start of Transmission (STX) Record Word
6Z-2 TCAS Display Text Display Data Control Word
6Z-3 TCAS Display Text Display Data Character Word
6Z-4 TCAS Display End of Transmission (EOT) Word
6AA Standard ARINC 429 Format - Selected Altitude to TCAS
6AB Standard ARINC 429 Format for Bus 1 Word 9 Transponder to TCAS
       and TA/RA Display Transponder and TCAS Outputs
7A Input/Output Circuit Standards
7B ARINC 429 Transmitter Logic States
8 Suppression Pulse System Characteristics
9A Typical Blade Antenna
9B Bearing Antenna Mounting Layout
9C TCAS Directional Antenna Envelope
9D Aircraft Installations
10 TCAS Antenna Configuration
11 Not Used
12 TCAS-Transponder Interface Bus
13 Environmental Test Categories
14-1 Standard VSI/TCAS Display Interwiring
14-2 Notes to Standard VIS/TCAS Display Interwiring
14-3 Standard VSI/TCAS Display Connector Layout
15-1 Alternate 1 VSI/TCAS Display Interwiring
15-2 Notes to Alternate #VSI/TCAS Display Interwiring
15-3 Alternate 1 VSI/TCAS Connector Layout
16-1 Alternate 2 VSI/TCAS Display Interwiring
16-2 Notes to Alternate 2 VSI/TCAS Display Interwiring
16-3 Alternate 2 VSI/TCAS Connector Layout
17-1 Alternate 3 VSI/TCAS Display Interwiring for Retrofit
       Installations
17-2 Notes to Alternate 3 VSI/TCAS Display Interwiring
17-3 Alternate 3 VSI/TCAS Connector Layout - TBD
18 TCAS System Functional Test Normal Output Definition
19 Data Words Applicable to RTCA/DO - 185 A
19A TCAS/Transponder Label Usage RTCA/DO - 185A Compatible
       Equipment
19B TCAS/Transponder Coordination Bus definition RTCA/DO - 18A
       Compatible Equipment
19C Transponder to TCAS (XT) XTWord 6
       RTCA/DO - 185A Compatible Equipment
19D TCAS to Transponder (TX) TXWord 2
       RTCA/DO - 185 A Compatible Equipment
19E TCAS to Transponder (TX) TGD Protocol
       RTCA/DO - 185A Compatible Equipment
19F TCAS to Transponder (TX) Resolution Advisories Report
       RTCA/DO - 185A Compatible Equipment
19G TCAS to Transponder (TX) Data Link Capability Report
       RTCA/DO - 185A Compatible Equipment
19H TCAS to Transponder (TX) Request for GICB Data
       RTCA/DO - 185A Compatible Equipment
19J Transponder to TCAS (XT) XGD Protocol
       RTCA/DO - 185A Compatible Equipment
20A ADS-B Intruder File Format
20B ADS-B Intruder File Structure - TCAS to Display
20C ADS-B Intruder Data Type Word Structure
20D ADS-B Intruder Start of File Protocol - STX
20E Flight ID Intruder File Protocol - ETX
20F TCAS Traffic Advisory, ADS-B Intruder File Header
20G TCAS Traffic Advisory, ADS-B Intruder Packet Header
20H TCAS Traffic Advisory, Intruder Flight ID Word (Char 1 & 2)
20I TCAS Traffic Advisory, Intruder ADS-B Extended Range, Altitude
       & Bearing Word
Appendices
1 Not Used
2 Label 270, Resolution Advisory Word, Reporting Combinations

Covers a Traffic Alert and Collision Avoidance System that gives protocols and interface definitions as required in RTCA/DO-185A.