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Generic Remote Interface Unit (RIU) Interface Control Document (ICD). CCSDS SOIS 2013 spring meeting Glenn Rakow/NASA-GSFC. Purpose. Evaluate the ICD requirements for an generalized RIU for the purpose of evaluating the SOIS EDS requirements. Agenda. Purpose Hardware Device ICD

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generic remote interface unit riu interface control document icd

GenericRemote Interface Unit (RIU)Interface Control Document (ICD)

CCSDS SOIS

2013 spring meeting

Glenn Rakow/NASA-GSFC

purpose
Purpose
  • Evaluate the ICD requirements for an generalized RIU for the purpose of evaluating the SOIS EDS requirements
agenda
Agenda
  • Purpose
  • Hardware Device ICD
  • Software Interface
  • Generalized RIU Functions
  • Protocol Profile
  • Command Formats
hardware device icd
Hardware Device ICD
  • Aspects of an ICD
    • Software interfaces
      • Data Link protocol
      • Messaging format
      • Timing relationships
      • Conversion factors
    • Connector interfaces*
      • External box connectors
      • Backplane
    • Mechanical interfaces*
      • Form factor
      • Thermal
      • Power
  • Need to represent complete ICD in EDS
    • Connector and mechanical require definition
      • Human readable
      • One-stop shopping

* Not focus for SOIS EDS but needs to be supported

some observations
Some Observations
  • Information to provide in EDS
    • Some information provided so that other side of interface may interpret data
    • Some information provided as insight
    • Needs to be clear as to normative and informative but always needs to be there
      • Depends upon complexity of device, e.g. ASIM or no ASIM
  • Need to understand data link controller on far end
    • Most Milbus controller (not packet driven) are table driven and controller configuration has transformation to data structure
    • Most SpaceWire controller (packet driven) require the user to assemble packet structure
    • Schedule driven version will do the segmentation for the user
software interface 1 2
Software Interface (1/2)
  • Data Link protocol
    • Defines the protocol
    • Does not describe the protocol
      • Defines subset of protocol that is applicable
      • Exception: If data link is not a standard protocol then description of protocol would be necessary, e.g., RS-422 interface
  • Messaging format
    • Describes the format of commands & telemetry
    • Addressing within the device
    • Defines quantity of telemetry and index description
software interface 2 2
Software Interface (2/2)
  • Timing relationships
    • Relationship of messages between producer and consumer
      • Request & indication (master & slave) – synchronized by consumer
      • Asynchronously sent
      • Synchronously sent – Data transmitted by device based upon timing information received
    • Frequency of messages/transactions
      • How often messages are generated
      • How generation is triggered
    • Timing information
      • Physical interface – may be part of data bus or separate discrete signal with pulse or combination
      • Time-Stamping of messages (if done)
      • Time Updates – Protocol for how this is done
        • Defined from the perspective of producer
        • Consumer will have to adapt
        • Accuracy –how manages jitter (does it compute average and adjust –may be necessary for any broadcast type trigger, e.g., SpaceWire Time Codes
  • Conversion factors
    • Formulas
    • Lookup tables
generalized riu functions
Generalized RIU Functions
  • 1553 Protocol – Long stub Interface
  • 1 Hz telemetry
    • TBD thermistors or PRTs
    • TBD external coarse sun sensors
    • TBD external hinge pots
    • TBD external pressure transducers
    • TBD external analog lines (S-Band TT&C)
    • TBD internal thermistors
    • TBD internal voltages
    • TBD external voltages from LVPC
    • TBD potential calibration channel
    • TBD current source calibration channel
  • 5 Hz telemetry
    • TBD external coarse sun sensors
  • Switch power to X heater zones
    • TBD 5 Amp heater zones
    • TBD 2 Amp heater zones
  • In-system programmable EEPROM
    • RS 422 Interface to read/write (test only)
    • Flight version contains PROM
protocol profile 1 x
Protocol Profile (1/X)

Need to clarify options within protocol definition

  • Mil-Std-1553b – long stub bus
  • Two data buses possible for use
    • Any combination as prime and standby supported (decision up to BC)
  • RT Address = 5
  • Message formats allowed:
    • BC to RT transfers
    • RT to BC transfers
    • Mode Control transfers
  • Message formats disallowed:
    • Broadcast message
    • RT-to-RT transfers
  • Sub-address’ accessible
    • All
    • Although not all used
      • Unused values are equal to zero
  • Mode Code supported
    • None
  • Status Word Flags
    • Message Error bit – active
    • All other status bits – always logic zero
protocol profile 2 x
Protocol Profile (2/X)
  • Data word & bit order
    • Most significant bit transferred first
      • Bits follow in descending order
    • Most significant byte transferred first
    • Data Word Order
      • Receive Command
        • Word #1 follows Receive Command Word
        • Word # 2 follows Word # 1
      • Transmit Command
        • Word #1 follows Status Word
        • Word # 2 follows Word # 1
        • Word # 32 last
command formats 1 x
Command Formats (1/x)
  • Heater Switch Control “ON” Receive Commands
    • Milbus values that are same for all Heater Control Regions “ON” commands:
      • RT Address=5
      • Receive
      • Word Count= 1
    • Milbus Sub-Address and Data Value are:
      • Heater Control Region #1
        • Sub-address= 2
        • Data Value = 0x0001
      • Heater Control Region #2
        • Sub-address= 3
        • Data Value = 0x0002
      • Heater Control Region #3
        • Sub-address= 4
        • Data Value = 0x0004
      • Heater Control Region #4
        • Sub-address= 5
        • Data Value = 0x0008
      • Heater Control Region #5
        • Sub-address= 6
        • Data Value = 0x0010
command formats 2 x
Command Formats (2/x)
  • Heater Switch Control “OFF” Receive Commands
    • Milbus values that are same for all Heater Control Regions “OFF” commands:
      • RT Address=5
      • Receive
      • Word Count= 1
    • Milbus Sub-Address and Data Value are:
      • Heater Control Region #1
        • Sub-address= 2
        • Data Value = 0x0000
      • Heater Control Region #2
        • Sub-address= 3
        • Data Value = 0x0000
      • Heater Control Region #3
        • Sub-address= 4
        • Data Value = 0x0000
      • Heater Control Region #4
        • Sub-address= 5
        • Data Value = 0x0000
      • Heater Control Region #5
        • Sub-address= 6
        • Data Value = 0x0000
    • All Heaters Regions are “OFF” after a RIU power-on reset
command formats 3 x
Command Formats (3/x)
  • Data Collection Sync Receive Command
    • Initiates collection of all analog telemetry channels by RT
    • Delay between successive commands
      • 140 ms
      • 5 Hz was the specification from the C&DH viewpoint
    • Milbus Format
      • RT Address =5
      • Receive
      • Sub-address = 1
      • Word Count= 32 (all zeros, i.e., 0b00000)
      • Data Word = don’t care (0xXXXX)
command formats 4 x
Command Formats (4/x)
  • Heater Region/Sync Count Status Read Command
    • Milbus values that are same for all Heater Control Regions “OFF” commands:
      • RT Address= 5
      • Transmit
      • Sub-address= 1
      • Word Count= 32 (all zeros, i.e., 0b00000)
    • Milbus Data Words are:
      • Word # 1- Heater Status
        • Data Format
          • Bits 15-5 – don’t cares (0bXXXX XXXX XXX)
          • Bit 4 – Heater 5 Status; Bit 3 – Heater 4 Status; Bit 2 – Heater 3 Status; Bit 1 – Heater 2 Status; Bit 0 – Heater 1 Status
          • Bit = 0b0 indicates “OFF”; Bit = 0b1 indicates “ON”
      • Word # 2 – Telemetry Counter
        • Data Format
          • Bits 15 – 0 – represents number of Sync Commands received
          • Count rolls over - different values on successive reads means telemetry has been updated
      • Words # 3 – 32 are don’t cares
command formats 5 x
Command Formats (5/x)
  • Thermistor Telemetry Status Read Command
    • Milbus values that are same for all Heater Control Regions “OFF” commands:
      • RT Address= 5
      • Transmit
      • Sub-address= 4
      • Word Count= 32 (all zeros, i.e., 0b00000)
    • Milbus Data Words are:
      • Word # 1- Thermistor # 65
      • Word # 32 – Thermistor # 96
      • Incrementing values in between
        • Data Format
          • Bits 15-12 – Not used – set to ‘1’s (0b1111)
          • Bits 11 -2 – ADC count
            • Bit 11 is msb
            • Bit 2 is lsb
          • Bits 1 – 0 – ADC Noise (don’t care – 0bXX)
command formats 6 x
Command Formats (6/x)
  • Thermistor Telemetry Status Read Command
    • Milbus values that are same for all Heater Control Regions “OFF” commands:
      • RT Address= 5
      • Transmit
      • Sub-address= 5
      • Word Count= 32 (all zeros, i.e., 0b00000)
    • Milbus Data Words are:
      • Word # 1- Thermistor # 97
      • Word # 16 – Thermistor # 112
      • Word # 17 – Thermistor # 33
      • Word # 32 – Thermistor # 48
      • Incrementing values in between
        • Data Format
          • Bits 15-12 – Not used – set to ‘1’s (0b1111)
          • Bits 11 -2 – ADC count
            • Bit 11 is msb
            • Bit 2 is lsb
          • Bits 1 – 0 – ADC Noise (don’t care – 0bXX)
command formats 7 x
Command Formats (7/x)
  • Thermistor Telemetry Status Read Command
    • Milbus values that are same for all Heater Control Regions “OFF” commands:
      • RT Address= 5
      • Transmit
      • Sub-address= 6
      • Word Count= 32 (all zeros, i.e., 0b00000)
    • Milbus Data Words are:
      • Word # 1- Thermistor # 49
      • Word # 16 – Thermistor # 64
      • Word # 17 – Thermistor # 17
      • Word # 32 – Thermistor # 32
      • Incrementing values in between
        • Data Format
          • Bits 15-12 – Not used – set to ‘1’s (0b1111)
          • Bits 11 -2 – ADC count
            • Bit 11 is msb
            • Bit 2 is lsb
          • Bits 1 – 0 – ADC Noise (don’t care – 0bXX)
command formats 8 x
Command Formats (8/x)
  • Thermistor Telemetry Status Read Command
    • Milbus values that are same for all Heater Control Regions “OFF” commands:
      • RT Address= 5
      • Transmit
      • Sub-address= 7
      • Word Count= 32 (all zeros, i.e., 0b00000)
    • Milbus Data Words are:
      • Word # 1- # 16, & # 30 - # 32- Reserved
      • Word # 17 –Conditioned Active Analog Monitor _# 16
      • Word # 29 – Conditioned Active Analog Monitor_# 28
      • Incrementing values in between
        • Data Format
          • Bits 15-12 – Not used – set to ‘1’s (0b1111)
          • Bits 11 -2 – ADC count
            • Bit 11 is msb
            • Bit 2 is lsb
          • Bits 1 – 0 – ADC Noise (don’t care – 0bXX)
more commands
More Commands
  • Have not included all commands here
    • Refer to ICD
conversions
Conversions
  • Describes the functions used to convert the raw data values sampled by the ADC into engineering units (ohms, voltage or current) and vice versa.
  • ADC specifics:
    • Each ADC converter is 12 bits, and accepts 0V to 4V full scale.
    • Digital output values are: 0 to 4095
    • => Voltage per bit = 4V / 4096 = 976.563E-6
passive thermistor conversions
Passive Thermistor Conversions
  • The raw thermistor samples returned by the RIU can be converted to resistance using the following formula:
    • T = Thermistor (ohms)
    • C = Digital output count from A/D
    • T = (3906.252 * C) / (4000 - .976563 * C )
    • C = ((( T * 4000 ) / ( T + 4000 )) * .001) / 976.563E-6
course sun sensor conversions
Course Sun Sensor Conversions
  • The raw CSS samples returned by the RIU can be converted to current values using the following formula:
    • CSS = Coarse Sun Sensor output (uA)
    • C = Digital output count from A/D
    • CSS = (976.563E-6 * C) / 2940
    • C = ( CSS * 2940 ) / 976.563E-6
active analog conversions
Active Analog Conversions
  • The raw Active Analog samples returned by the RIU can be converted to voltages using the following formula:
    • AA = Active Analog (V)
    • C = Digital output count from A/D
    • AA = (976.563E-6 * C) / 0.8008
    • C = (0.8008 * AA) / 976.563E-6
pressure transducer conversion
Pressure Transducer Conversion
  • The raw pressure transducer samples returned by the RIU can be converted to voltages using the following formula:
    • PT = Pressure Transducer (V)
    • C = Digital output count from A/D
    • PT = (976.563E-6 * C) / 0.8
    • C = (0.8 * PT) / 976.563E-6
3 3v or 2 5v monitor conversion
3.3V or 2.5V Monitor Conversion
  • The raw samples returned by the RIU for 3.3 or 2.5V monitors can be converted to voltages
  • using the following formula:
    • M = Monitor Voltage (V)
    • C = Digital output count from A/D
    • M = C * 976.563E-6
    • C = M / 976.563E-6
5v monitor conversion
5V Monitor Conversion
  • The raw samples returned by the RIU for 5V monitors can be converted to voltage using the following formula:
    • M = Monitor Voltage (V)
    • C = Digital output count from A/D
    • M = (976.563E-6 * C) / 0.5
    • C = (0.5 * M) / 976.563E-6