ARINC 561-11 : 1975

1.0 INTRODUCTION AND DESCRIPTION
1.1 Purpose
1.2 Functions and Modes of Operation
1.3 Reliability
1.4 Unit Description
1.5 Interchangeability
1.6 Regulatory Approval
2.0 STANDARDS REQUIRED TO EFFECT INTERCHANGEABILITY
2.1 Form Factors, Connectors, and Index Pin Coding
2.2 Input and Output Signal Characteristics
2.3 Standard Interwiring
2.4 Power Circuitry
2.5 Weights
2.6 Environmental Conditions
2.7 Navigation Unit Mounting
2.8 External Program Control
2.9 INS Inter-Communications
2.10 Inter-System Comparison
2.11 Control/Display Operational Characteristics
3.0 SYSTEM DESIGN CONSIDERATIONS
3.1 General
3.2 Basic Modes of System Operation
3.3 System Controls
3.4 System Inputs
3.5 Outputs
3.6 Integrity Monitoring and Failure Warning Outputs
3.7 INS Equipment Accuracy
3.8 INS Inter-Communications System
3.9 INS Inter-System Comparison
3.10 INS Steering Signal
4.0 STANDARD SIGNAL CHARACTERISTICS
4.1 General Accuracy and Operating Ranges
4.2 Inputs
4.3 Outputs
5.0 BASIC DIGITAL SIGNAL STANDARDS
5.1 Basic Serial Data Transmission Standards
5.2 Data Message
5.3 Transmission Order
5.4 Electrical Characteristics
5.5 Digital Transmitter
5.6 Digital Receiver
5.7 Data Circuit Switching
5.8 Remote Display Devices
6.0 NAVIGATION UNIT DESIGN
6.1 General
6.2 Mounting Rigidity
7.0 ELECTRONICS DESIGN
7.1 General
7.2 Time-Shared Digital-to-Analog (D/A) Converter
7.3 Time Shared Digital Outputs
7.4 Alignment 'Figure of Merit'
7.5 Output Isolation
8.0 CONTROL/DISPLAY UNIT DESIGN
8.1 General
8.2 Data Loading
8.3 Pairing of Outputs for Display
8.4 Discrete Push Button Controls
8.5 Display Dimmers
8.6 Panel Illumination
8.7 Polarity of Displayed Information
8.8 Display Legibility
9.0 MODE SELECTOR UNIT DESIGN
9.1 General
9.2 Mode Selector Switch
9.3 Functional Test Switch (Optional)
9.4 'Ready-Nav' Light
9.5 'BATT' Warning Light
9.6 Panel Illumination
10.0 REMOTE CONTROL AND DISPLAY UNIT DESIGN
10.1 General
ATTACHMENT
ATTACHMENT 1 - NOTES APPLICABLE TO THE INS STANDARD
                    INTERWIRING
ATTACHMENT 2-1 - STANDARD INTERWIRING
ATTACHMENT 2-2 - STANDARD INTERWIRING
ATTACHMENT 3-1 - INS PIN ASSIGNMENTS (LEFT HAND PLUGS)
ATTACHMENT 3-2 - INS PIN ASSIGNMENTS (RIGHT HAND PLUGS)
ATTACHMENT 3-3 - INS NAVIGATION UNIT - FORM FACTOR
ATTACHMENT 3-4 - INS NAVIGATION UNIT - MOUNTING DIMENSIONS
                    AND TOLERANCES
ATTACHMENT 3-5 - DELETED
ATTACHMENT 3-6 - INS PLATFORM MOUNT
ATTACHMENT 4 - BATTERY UNIT FORM FACTOR
ATTACHMENT 5 - INPUTS AND OUTPUTS
ATTACHMENT 6 - INS SYNCHRO EXCITATION
ATTACHMENT 7-1 - INS CONTROL/DISPLAY UNIT PIN ASSIGNMENTS
ATTACHMENT 7-2 - INS CONTROL/DISPLAY UNIT (PUSH BUTTON
                    CONTROLS)
ATTACHMENT 7-3 - INS CONTROL/DISPLAY UNIT (SELECTOR
                    SWITCH-PUSH BUTTON CONTROLS)
ATTACHMENT 7-4 - INS REMOTE CONTROL & DISPLAY UNITS
                    (SEPARATE UNITS)
ATTACHMENT 8-1 - INS MODE SELECTOR PANEL PIN ASSIGNMENT
ATTACHMENT 8-2 - INS MODE SELECTOR PANEL FORM FACTOR
ATTACHMENT 9 - FUTURE COMPASS COUPLER SYSTEM
ATTACHMENT 10-1 - CUSTOMER NEEDS FOR ATTITUDE OUTPUT ISOLATION
ATTACHMENT 10-2 - ATTITUDE OUTPUT ISOLATION NEEDS
ATTACHMENT 11-1 - POSSIBLE INSTRUMENTATION CONFIGURATIONS
                   USING BASIC INS OUTPUTS
ATTACHMENT 11-2 - TYPICAL INSTRUMENTATION SINGLE SERVO
                    (EXISTING) HSI
ATTACHMENT 11-3 - TYPICAL INSTRUMENTATION FOR TRACK ANGLE
                    BASIC DISPLAY ON THREE SERVO (NEW) HIS
ATTACHMENT 11-4 - TYPICAL INSTRUMENTATION - USE OF DRIFT
                    ANGLE PLUS TRACK ANGLE ERROR (NEW THREE SERVO HSI)
ATTACHMENT 12-1 - SUMMARY OF DIGITAL OUTPUT STANDARDS
ATTACHMENT 12-2 - DIGITAL SIGNAL TIMING
ATTACHMENT 12-3 - SIGNAL TIMING TOLERANCES
ATTACHMENT 12-4 - BCD CODE ASSIGNMENTS
ATTACHMENT 12-5 - INS LABEL/ADDRESS CODE ASSIGNMENTS
ATTACHMENT 12-5-1 - ARINC 575 DADS LABEL/ADDRESS CODE ASSIGNMENTS
ATTACHMENT 12-6 - INS INPUT & OUTPUT CIRCUIT STANDARDS
ATTACHMENT 12-7 - TYPICAL EXAMPLES OF STANDARD BINARY
                    DATA EXPRESSED IN TWO'S COMPLEMENT FRACTIONAL
                    NOTATION
ATTACHMENT 12-8 - LOGIC LEVEL WAVEFORMS
ATTACHMENT 12-9 - ARINC BCD DIGITAL WORD STRUCTURES
                    APPLICABLE TO CHARACTERISTICS 561,
                    568, AND 575
ATTACHMENT 13 - INS 'COMPUTER BUS' POWER
ATTACHMENT 14 - INTERCHANGE OF DATA BETWEEN INS
                    SYSTEMS
John & Mary - SIGNAL PHASE REVERSAL FOR TWO-WIRE
                    PITCH & ROLL OUTPUTS
APPENDIX 1 - DIAGRAM OF INS TERMINOLOGY
APPENDIX 1 - DISCUSSION OF INS TERMINOLOGY PROBLEMS
APPENDIX 2 - DOPPLER RADAR NAVIGATION NOMENCLATURE
               (EXTRACTED FROM ARINC CHARACTERISTIC 543)
APPENDIX X-1 - CHRONOLOGY OF AEEC INS NEWSLETTERS
APPENDIX X-2 - INS SUBCOMMITTEE MEETING PARTICIPANTS

Describes the requirements of an INS, which provides sensor and steering command outputs.