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ESA UNCLASSIFIED – For Official Use
NPAL Datasheet
F. Torelli & P. SkrzypekCCSDS Spring Meeting 201316/04/2013
NPAL Datasheet | 16/04/2013 | Slide 2
ESA UNCLASSIFIED – For Official Use
Contents
• Introduction
• Describing functional interface
• Describing device-specific interface
• Describing packet interface
• Implementing device abstraction control procedure
• Implementing device-specific access protocol
• Summary
NPAL Datasheet | 16/04/2013 | Slide 3
ESA UNCLASSIFIED – For Official Use
INTRODUCTION
NPAL Datasheet | 16/04/2013 | Slide 4
ESA UNCLASSIFIED – For Official Use
Introduction
The NPAL device is a multi-function camera with the ability to perform horizon detection and star tracking. The device uses Space Wire link to communicate. The NPAL ICD lists over 23 different data packets.
For the purpose of this presentation, Space Wire has been mapped on SOIS packet service. This presentation is focused on describing packets, SOIS interfaces and access protocols for this device.
Due to the complexity of the device, only a subset of functionality is addressed in this presentation.
NPAL Datasheet | 16/04/2013 | Slide 5
ESA UNCLASSIFIED – For Official Use
FUNCTIONAL INTERFACE
NPAL Datasheet | 16/04/2013 | Slide 6
ESA UNCLASSIFIED – For Official Use
Functional interface
Acquire Image
Value ID
Acquire Image,
no arguments
Value
1024x1024 matrix of integer values ranged 0..255
Meta data
bivalent – success or failure
1. <functional_interface> 2. 3. <interface> 4. <!-- .. --> 5. <acquire> 6. <value_id type="fi_image_acq"/> 7. <value type="fi_image"/> 8. <metadata type="fi_bivalent"/> 9. </acquire> 10. </interface> 11. 12. <data_types> 13. <!-- .. --> 14. <sequence name="fi_image_acq"> 15. <declare name="header" type="fi_id_header"> 16. <constraint field="id"> 17. <option name="Image"/> 18. </constraint> 19. </declare> 20. </sequence> 21. <array name="fi_image" type="fi_image_line"> 22. <count const="1024"/> 23. </array> 24. <array name="fi_image_line" type="fi_pixel_intensity_t">
25. <count const="1024"/> 26. </array> 27. <int name="fi_pixel_intensity_t"> 28. <constraints> 29. <interval> 30. <left bound="closed" value="0"/> 31. <right bound="closed" value="255"/> 32. </interval> 33. </constraints> 34. </int> 35. </data_types> 36. </functional_interface>
NPAL Datasheet | 16/04/2013 | Slide 7
ESA UNCLASSIFIED – For Official Use
Functional interface
Acquire Temperature
Value ID
Acquire Temperature,
select one of the two thermocouples (APS, Optics)
Value
single float number ranged 0..1.4167911e32
Meta data
bivalent – success or failure
1. <functional_interface> 2. 3. <interface> 4. <!-- .. --> 5. <acquire> 6. <value_id type="fi_temperature_acq"/> 7. <value type="fi_temperature"/> 8. <metadata type="fi_bivalent"/> 9. </acquire> 10. </interface> 11. 12. <data_types> 13. <!-- .. --> 14. <sequence name="fi_temperature_acq"> 15. <declare name="header" type="fi_id_header"> 16. <constraint field="id"> 17. <option name="Temperature"/> 18. </constraint> 19. </declare> 20. <declare name="unit" type="fi_thermocouple"/> 21. </sequence> 22. <enum name="fi_thermocouple"> 23. <options> 24. <option name="Optics" value="1"/> 25. <option name="APS" value="2"/> 26. </options> 27. </enum> 28. <float name="fi_temperature"> 29. <constraints> 30. <interval> 31. <left bound="closed" value="0"/> 32. <right bound="closed" value="1.4167911e32"/> 33. </interval> 34. </constraints> 35. </float> 36. </data_types> 37. </functional_interface>
NPAL Datasheet | 16/04/2013 | Slide 8
ESA UNCLASSIFIED – For Official Use
Functional interface
Command Exposure time
Value ID
Command Exposure time,
no arguments
Value
single float argument ranged 0.050e-3..100.0e-3
Meta data
bivalent – success or failure
1. <functional_interface> 2. 3. <interface> 4. <!-- .. --> 5. <command> 6. <value_id type="fi_exposure_cmd"/> 7. <value type="fi_exposure"/> 8. <metadata type="fi_bivalent"/> 9. </command> 10. </interface> 11. 12. <data_types> 13. <!-- .. --> 14. <sequence name="fi_exposure_cmd"> 15. <declare name="header" type="fi_id_header"> 16. <constraint field="id"> 17. <option name="Exposure time"/> 18. </constraint> 19. </declare> 20. </sequence> 21. <float name="fi_exposure"> 22. <constraints> 23. <interval> 24. <left bound="closed" value="0.000050"/> 25. <right bound="closed" value="0.100000"/> 26. </interval> 27. </constraints> 28. </float> 29. </data_types> 30. </functional_interface>
NPAL Datasheet | 16/04/2013 | Slide 9
ESA UNCLASSIFIED – For Official Use
DEVICE-SPECIFIC INTERFACE
NPAL Datasheet | 16/04/2013 | Slide 10
ESA UNCLASSIFIED – For Official Use
1. <device_specific_interface> 2. 3. <interface> 4. <!-- .. --> 5. <acquire> 6. <value_id type="di_image_acq"/> 7. <value type="di_image"/> 8. <metadata type="di_bivalent"/> 9. </acquire> 10. </interface> 11. 12. <data_types> 13. <!-- .. --> 14. <sequence name="di_image_acq"> 15. <declare name="header" type="di_id_header"> 16. <constraint field="id"> 17. <option name="Image"/> 18. </constraint> 19. </declare> 20. </sequence> 21. <array name="di_image" type="di_image_line"> 22. <count const="1024"/> 23. </array> 24. <array name="di_image_line" type="di_pixel_intensity"> 25. <count const="1024"/> 26. </array> 27. <int name="di_pixel_intensity"> 28. <constraints> 29. <interval> 30. <left bound="closed" value="0"/> 31. <right bound="closed" value="255"/> 32. </interval> 33. </constraints> 34. </int> 35. </data_types> 36. </device_specific_interface>
Device-specific interface
Acquire Image
Value ID
Acquire Image,
no arguments
Value
1024x1024 matrix of integer values ranged 0..255
Meta data
bivalent – success or failure
NPAL Datasheet | 16/04/2013 | Slide 11
ESA UNCLASSIFIED – For Official Use
Device-specific interface
Acquire Temperature
Value ID
Acquire Temperature,
select one of the two thermocouples (APS, Optics)
Value
single integer number ranged 0..65535
Meta data
bivalent – success or failure
1. <device_specific_interface> 2. 3. <interface> 4. <!-- .. --> 5. <acquire> 6. <value_id type="di_temperature_acq"/> 7. <value type="di_temperature"/> 8. <metadata type="di_bivalent"/> 9. </acquire> 10. </interface> 11. 12. <data_types> 13. <!-- .. --> 14. <sequence name="di_temperature_acq"> 15. <declare name="header" type="di_id_header"> 16. <constraint field="id"> 17. <option name="Temperature"/> 18. </constraint> 19. </declare> 20. <declare name="unit" type="di_thermocouple"/> 21. </sequence> 22. <enum name="di_thermocouple"> 23. <options> 24. <option name="Optics" value="1"/> 25. <option name="APS" value="2"/> 26. </options> 27. </enum> 28. <int name="di_temperature"> 29. <constraints> 30. <interval> 31. <left bound="closed" value="0"/> 32. <right bound="closed" value="65535"/> 33. </interval> 34. </constraints> 35. </int> 36. </data_types> 37. </device_specific_interface >
NPAL Datasheet | 16/04/2013 | Slide 12
ESA UNCLASSIFIED – For Official Use
Device-specific interface
Command Exposure time
Value ID
Command Exposure time,
no arguments
Value
single value from enumeration type
Meta data
bivalent – success or failure
1. <device_specific_interface> 2. 3. <interface> 4. <!-- .. --> 5. <command> 6. <value_id type="di_exposure_cmd"/> 7. <value type="di_exposure"/> 8. <metadata type="di_bivalent"/> 9. </command> 10. </interface> 11. 12. <data_types> 13. <!-- .. --> 14. <sequence name="di_exposure_cmd"> 15. <declare name="header" type="di_id_header"> 16. <constraint field="id"> 17. <option name="Exposure time"/> 18. </constraint> 19. </declare> 20. </sequence> 21. <enum name="di_exposure"> 22. <options> 23. <option name="0.069ms" value="0"/> 24. <option name="0.082ms" value="1"/> 25. <!-- .. --> 26. <option name="84.10ms" value="41"/> 27. <option name="100.0ms" value="42"/> 28. </options> 29. </enum> 30. </data_types> 31. </device_specific_interface>
NPAL Datasheet | 16/04/2013 | Slide 13
ESA UNCLASSIFIED – For Official Use
Device-specific interface
Command Link speed
Value ID
Command Link speed,
no arguments
Value
single value from enumeration type
Meta data
bivalent – success or failure
1. <device_specific_interface> 2. 3. <interface> 4. <!-- .. --> 5. <command> 6. <value_id type="di_speed_cmd"/> 7. <value type="di_speed"/> 8. <metadata type="di_bivalent"/> 9. </command> 10. </interface> 11. 12. <data_types> 13. <!-- .. --> 14. <sequence name="di_speed_cmd"> 15. <declare name="header" type="di_id_header"> 16. <constraint field="id"> 17. <option name="Set speed"/> 18. </constraint> 19. </declare> 20. </sequence> 21. <enum name="di_speed"> 22. <options> 23. <option name="100 Mbps" value="0"/> 24. <option name="50 Mbps" value="1"/> 25. <option name="25 Mbps" value="2"/> 26. <option name="16.7 Mbps" value="3"/> 27. <option name="12.5 Mbps" value="4"/> 28. <option name="10 Mbps" value="5"/> 29. </options> 30. </enum> 31. </data_types> 32. </device_specific_interface>
NPAL Datasheet | 16/04/2013 | Slide 14
ESA UNCLASSIFIED – For Official Use
PACKET INTERFACE
NPAL Datasheet | 16/04/2013 | Slide 15
ESA UNCLASSIFIED – For Official Use
Packet interface
TC_TRK
1. <packet_interface> 2. 3. <interface> 4. <!-- .. --> 5. <packet> 6. <data type="pi_tc_trk"/> 7. </packet> 8. </interface> 9. 10. <data_types> 11. <!-- .. --> 12. <sequence name="pi_tc_trk"> 13. <declare name="header" type="pi_tc_header"> 14. <constraint field="data_header"> 15. <constraint field="service_type"> 16. <const value="4"/> 17. </constraint> 18. </constraint> 19. </declare> 20. <declare name="window_start_row" type="pi_pixel_coord"
/> 21. <declare name="window_start_column" type="pi_pixel_coo
rd"/>22. <declare name="commanded_exposure_time" 23. type="pi_exposure_time"/> 24. <declare name="tracking_option" type="pi_tracking_opti
on"/>25. <declare name="footer" type="pi_tc_footer"/> 26. </sequence> 27. </data_types> 28. </packet_interface>
Telecommand header
1 Window start row, bits 0-7
2 Window start row, bits 8-15
3 Window start column, bits 0-7
4 Window start column, bits 8-15
5 Commanded exposure time
6 Tracking option
Telecommand footer
NPAL Datasheet | 16/04/2013 | Slide 16
ESA UNCLASSIFIED – For Official Use
Packet interface
TM_REPORT
1. <packet_interface> 2. 3. <interface> 4. <!-- .. --> 5. <packet> 6. <data type="pi_tm_report"/> 7. </packet> 8. </interface> 9. 10. <data_types> 11. <!-- .. --> 12. <sequence name="pi_tm_report"> 13. <declare name="header" type="pi_tm_header"> 14. <constraint field="data_header"> 15. <constraint field="service_type"> 16. <const value="3"/> 17. </constraint> 18. </constraint> 19. </declare> 20. <declare name="event_code" type="pi_event_code"/> 21. <declare name="tc_acceptance" type="pi_tc_acceptance"/
> 22. <declare name="previous_mode" type="pi_mode"/> 23. <declare name="current_mode" type="pi_mode"/> 24. <declare name="cause_of_mode_transition" 25. type="pi_mode_transition_cause"/> 26. <declare name="download_status" type="pi_download_stat
us"/>27. <declare name="not_used" type="pi_fill8"/> 28. <declare name="calibration" type="pi_calibration_statu
s"/>29. <declare name="error_code" type="pi_error_code"/> 30. <declare name="fill1" type="pi_fill8"/> 31. <declare name="fill2" type="pi_fill8"/> 32. <declare name="fill3" type="pi_fill8"/> 33. <declare name="footer" type="pi_tm_footer"/> 34. </sequence> 35. </data_types> 36. </packet_interface>
Telemetry header
1 Event code
2 TC acceptance
3 Mode transition
4 Download status
5 Not used
6 Calibration
7 Error code
8 Fill byte
9 Fill byte
10 Fill byte
Telemetry footer
NPAL Datasheet | 16/04/2013 | Slide 17
ESA UNCLASSIFIED – For Official Use
DEVICE ABSTRACTION CONTROL PROCEDURE
NPAL Datasheet | 16/04/2013 | Slide 18
ESA UNCLASSIFIED – For Official Use
Acquire Temperature
1. <device_abstraction_control_procedure> 2. <!-- .. --> 3. <request_handler> 4. 5. <variables> 6. <declare name="dvs_id" type="fi_temperature_acq"/> 7. <declare name="das_id" type="di_temperature_acq"/> 8. <declare name="temperature_raw" type="di_temperature"/
> 9. <declare name="temperature_kelvin" type="fi_temperatur
e"/>10. <declare name="dvs_meta" type="fi_bivalent"/> 11. <declare name="das_meta" type="di_bicalent"/> 12. </variables> 13. 14. <value_id> 15. <variable name="dvs_id"/> 16. </value_id> 17. 18. <value> 19. <variable name="temperature_kelvin"/> 20. </value> 21. 22. <metadata> 23. <variable name="dvs_meta"/> 24. </metadata> 25. 26. <process> 27. <!-- see next slide --> 28. </process> 29. 30. </request_handler> 31. </device_abstraction_control_procedure>
The following code attaches a process to the functional interface. This process will be executed each time the system receives ACQUIRE_FROM_DEVICE primitive with value_id matching fi_temperature_acq.
NPAL Datasheet | 16/04/2013 | Slide 19
ESA UNCLASSIFIED – For Official Use
Acquire Temperature
dvs_id.unit = APS
dvs_id.unit = OpticsN
das_id.unit := APS das_id.unit := Optics
Y Y
DAS.ACQUIRE_FROM_DEVICE.requestvalue_id <= das_idvalue <= temperature_rawmetadata <= das_metatimeout <= das_timeout
.indication received in time
Y
N
das_meta = success
dvs_meta := failure
dvs_meta := failure
linear_calibrationslope <= 1bias <= -100input <= temperature_rawoutput <= temperature_kelvin
dvs_meta := success
YN
START
NPAL Datasheet | 16/04/2013 | Slide 20
ESA UNCLASSIFIED – For Official Use
Acquire Temperature
1. <compare> 2. <subject> 3. <variable name="dvs_id"> <variable name="unit"/> </variable> 4. <subject> 5. <equal> 6. <reference> 7. <const value="APS"/> 8. </reference> 9. <process> 10. <copy> 11. <destination> 12. <variable name="das_id"/><variable name="unit"/></
variable>13. </destination> 14. <source> 15. <const value="APS"/> 16. </source> 17. </copy> 18. </process> 19. </equal> 20. <equal> 21. <reference> 22. <const value="Optics"/> 23. </reference> 24. <process> 25. <copy> 26. <destination> 27. <variable name="das_id"/><variable name="unit"/></
variable> 28. </destination> 29. <source> 30. <const value="Optics"/> 31. </source> 32. </copy> 33. </process> 34. </equal> 35. </compare>
dvs_id.unit = APS
dvs_id.unit = OpticsN
das_id.unit := APS das_id.unit := Optics
Y Y
NPAL Datasheet | 16/04/2013 | Slide 21
ESA UNCLASSIFIED – For Official Use
Acquire Temperature
1. <das_acquire> 2. 3. <value_id> 4. <variable name="das_id"/> 5. </value_id> 6. 7. <value> 8. <variable name="temperature_raw"/> 9. </value> 10. 11. <metadata> 12. <variable name="das_meta"/> 13. </metadata> 14. 15. <time_limit> 16. <alias name="das_timeout"/> 17. </time_limit> 18. 19. <on_success> 20. <!-- see next slide --> 21. </on_success> 22. 23. <on_timeout> 24. <!-- see next slide --> 25. </on_timeout> 26. 27. </das_acquire>
DAS.ACQUIRE_FROM_DEVICE.requestvalue_id <= das_idvalue <= temperature_rawmetadata <= das_metatimeout <= das_timeout
.indication received in timeY N
NPAL Datasheet | 16/04/2013 | Slide 22
ESA UNCLASSIFIED – For Official Use
Acquire Temperature
1. <compare> 2. <subject> 3. <variable name="das_meta"/> 4. </subject> 5. <reference> 6. <const value="success"/> 7. </reference> 8. <equal> 9. <linear_calibration> 10. <slope> <const value="1"/> </slope> 11. <bias> <const value="-100"/> </bias> 12. <input> <variable name="temperature_raw"/> </input> 13. <output> <variable name="temperature_kelvin"/> </output> 14. </linear_calibration> 15. <copy> 16. <destination> 17. <variable name="dvs_meta"/> 18. </destination> 19. <source> 20. <const value="success"/> 21. </source> 22. </copy> 23. </equal> 24. <not_equal> 25. <copy> 26. <destination> 27. <variable name="dvs_meta"/> 28. </destination> 29. <source> 30. <const value="failure"/> 31. </source> 32. </copy> 33. </not_equal> 34.</compare>
1. <copy> 2. <destination> 3. <variable name="dvs_meta"/> 4. </destination> 5. <source> 6. <const value="failure"/> 7. </source> 8. </copy>
das_meta = success
dvs_meta := failure
dvs_meta := failure
linear_calibrationslope <= 1bias <= -100input <= temperature_rawoutput <= temperature_kelvin
dvs_meta := success
Y N
NPAL Datasheet | 16/04/2013 | Slide 23
ESA UNCLASSIFIED – For Official Use
DEVICE-SPECIFIC ACCESS PROTOCOL
NPAL Datasheet | 16/04/2013 | Slide 24
ESA UNCLASSIFIED – For Official Use
Command Exposure time
1. <device_specific_access_protocol> 2. <!-- .. --> 3. <request_handler> 4. 5. <variables> 6. <declare name="id" type="di_exposure_cmd"/> 7. <declare name="data" type="di_exposure"/> 8. <declare name="meta" type="di_bivalent"/> 9. <declare name="trk_packet" type="pi_tc_trk"/> 10. <declare name="report_packet" type="pi_tm_report"/> 11. </variables> 12. 13. <value_id> 14. <variable name="id"/> 15. </value_id> 16. 17. <value> 18. <variable name="data"/> 19. </value> 20. 21. <metadata> 22. <variable name="meta"/> 23. </metadata> 24. 25. <process> 26. <!-- see next slides --> 27. </process> 28. 29. </request_handler> 30. </device_specific_access_protocol>
The following code attaches a process to the device-specific interface. This process will be executed each time the system receives COMMAND_DEVICE primitive with value_id matching di_exposure_cmd.
NPAL Datasheet | 16/04/2013 | Slide 25
ESA UNCLASSIFIED – For Official Use
Command Exposure time
trk_packet.window_start_row := 0trk_packet.window_start_column := 0trk_packet.tracking_option := normal
data = 0.069ms
data = 0.082ms
data = 84.10ms
data = 100.0ms
PS.PACKET_SEND.requestdestination_address <= npal_addrdata <= trk_packet
wait for PS.PACKET.RECEIVE.indicationsource_address <= npal_addrdata <= report_packettimeout <= npal_timeout
packet received in time
meta := failure
meta := failure
report_packet.tc_acceptance = accepted
meta := success
trk_packet.commanded_exposure_time := 0.069ms
trk_packet.commanded_exposure_time := 0.082ms
trk_packet.commanded_exposure_time := 84.10ms
trk_packet.commanded_exposure_time := 100.0msY
N
Y
N
Y
N
Y
N
NY
NY
START
...
NPAL Datasheet | 16/04/2013 | Slide 26
ESA UNCLASSIFIED – For Official Use
Command Exposure time
1. <copy> 2. <destination> 3. <variable name="trk_packet"/> 4. <variable name="window_start_row"/> 5. </variable> 6. </destination> 7. <source> 8. <const value="0"/> 9. </source> 10. </copy> 11. <copy> 12. <destination> 13. <variable name="trk_packet"/> 14. <variable name="window_start_column"/> 15. </variable> 16. </destination> 17. <source> 18. <const value="0"/> 19. </source> 20. </copy> 21. <copy> 22. <destination> 23. <variable name="trk_packet"/> 24. <variable name="tracking_option"/> 25. </variable> 26. </destination> 27. <source> 28. <const value="normal"/> 29. </source> 30. </copy>
trk_packet.window_start_row := 0
trk_packet.window_start_column := 0
trk_packet.tracking_option := normal
NPAL Datasheet | 16/04/2013 | Slide 27
ESA UNCLASSIFIED – For Official Use
Command Exposure time
1. <compare> 2. <subject> 3. <variable name="data"/> 4. </subject> 5. <equal> 6. <reference> 7. <const value="0.069ms"> 8. </reference> 9. <process> 10. <copy> 11. <destination> 12. <variable name="trk_packet"> 13. <variable name="commanded_exposure_time"/> 14. </variable> 15. </destination> 16. <source> 17. <const value="0.069ms"/> 18. </source> 19. </copy> 20. </process> 21. </equal> 22. <equal> 23. <reference> 24. <const value="0.082ms"> 25. </reference> 26. <process> 27. <copy> 28. <destination> 29. <variable name="trk_packet"> 30. <variable name="commanded_exposure_time"/> 31. </variable> 32. </destination> 33. <source> 34. <const value="0.082ms"/> 35. </source> 36. </copy> 37. </process> 38. </equal>
data = 0.069ms
data = 0.082ms
trk_packet.commanded_exposure_time := 0.069ms
trk_packet.commanded_exposure_time := 0.082ms
Y
N
Y
N
NPAL Datasheet | 16/04/2013 | Slide 28
ESA UNCLASSIFIED – For Official Use
Command Exposure time
1. <equal> 2. <reference> 3. <const value="84.10ms"> 4. </reference> 5. <process> 6. <copy> 7. <destination> 8. <variable name="trk_packet"> 9. <variable name="commanded_exposure_time"/> 10. </variable> 11. </destination> 12. <source> 13. <const value="84.10ms"/> 14. </source> 15. </copy> 16. </process> 17. </equal> 18. <equal> 19. <reference> 20. <const value="100.0ms"> 21. </reference> 22. <process> 23. <copy> 24. <destination> 25. <variable name="trk_packet"> 26. <variable name="commanded_exposure_time"/> 27. </variable> 28. </destination> 29. <source> 30. <const value="100.0ms"/> 31. </source> 32. </copy> 33. </process> 34. </equal> 35. </compare>
data = 84.10ms
data = 100.0ms
trk_packet.commanded_exposure_time := 84.10ms
trk_packet.commanded_exposure_time := 100.0ms
Y
N
Y
N
NPAL Datasheet | 16/04/2013 | Slide 29
ESA UNCLASSIFIED – For Official Use
Command Exposure time
1. <packet_send> 2. <destination_address> 3. <alias name="npal_addr"/> 4. </destination_address> 5. <data> 6. <variable name="trk_packet"/> 7. </data> 8. </packet_send> 9. <wait_for_packets> 10. <scenario> 11. <minterm> 12. <packet_receive> 13. <source_address> 14. <alias name="npal_addr"/> 15. </source_address> 16. <data> 17. <variable name="report_packet"/> 18. </data> 19. </packet_receive> 20. </minterm> 21. <process> 22. <!-- see next slide --> 23. </process> 24. </scenario> 25. <timeout> 26. <time_limit> 27. <alias name="npal_timeout"/> 28. </time_limit> 29. <process> 30. <!-- see next slide --> 31. </process> 32. </timeout> 33. </wait_for_packets>
PS.PACKET_SEND.requestdestination_address <= npal_addrdata <= trk_packet
wait for PS.PACKET.RECEIVE.indicationsource_address <= npal_addrdata <= report_packettimeout <= npal_timeout
NPAL Datasheet | 16/04/2013 | Slide 30
ESA UNCLASSIFIED – For Official Use
Command Exposure time
1. <compare> 2. <subject> 3. <variable name="report_packet"> 4. <variable name="tc_acceptance"/> 5. </variable> 6. </subject> 7. <reference> 8. <const value="accepted"/> 9. </reference> 10. <equal> 11. <copy> 12. <destination> 13. <variable name="meta"/> 14. </destination> 15. <source> 16. <const value="success"/> 17. </source> 18. </copy> 19. </equal> 20. <not_equal> 21. <copy> 22. <destination> 23. <variable name="meta"/> 24. </destination> 25. <source> 26. <const value="failure"/> 27. </source> 28. </copy> 29. </not_equal> 30. </compare>
1. <copy> 2. <destination> 3. <variable name="meta"/
> 4. </destination> 5. <source> 6. <const value="failure"/
> 7. </source> 8. </copy>
packet received in time
meta := failure
meta := failure
Report_packet.tc_acceptance = accepted
meta := success
NY
NY
NPAL Datasheet | 16/04/2013 | Slide 31
ESA UNCLASSIFIED – For Official Use
SUMMARY
NPAL Datasheet | 16/04/2013 | Slide 32
ESA UNCLASSIFIED – For Official Use
Summary
• Described sample SOIS functional interface and device-specific interface
• Described 2 NPAL packets available from SOIS subnetwork
• Implemented one process of the device-specific access protocol
• Implemented one process of the device abstraction control procedure
• The attached XML document contains description of all NPAL packets
and all sample SOIS interfaces
• Attached EDS may not be perfectly cnsistent. Back-propagating all
updates to the EDS schema is very time consuming.