Attribute-based system and method for configuring and controlling a data acquisition task

• US 6,067,584 A
• Filed: 09/09/1996
• Issued: 05/23/2000
• Est. Priority Date: 09/09/1996
• Status: Expired due to Term

• Current Assignee: National Instruments Corporation (Emerson Electric Company)
• Original Assignee: National Instruments Corporation (Emerson Electric Company)
• Inventors: Bednar, James A., Hayles, Tim
• Primary Examiner(s): Lee, Thomas C.
• Assistant Examiner(s): WANG, ALBERT C
• Application Number:
  US08/711,128
• Time in Patent Office: 1,352 Days
• Field of Search: 702/127, 702/187, 709/302, 709/303, 710/10, 710/14
• US Class Current: 710/10
• CPC Class Codes: G06F 9/44 Arrangements for executing specific programs

Abstract

A data acquisition system comprising a computer system, coupled to a data acquisition device, a data acquisition application executing on the computer system, and device interface software with an attribute-based API executing on the computer system. The attribute-based API enables the data acquisition application to perform steps to control the data acquisition device. The steps comprise creating a task for controlling the data acquisition device, setting values of the attributes of the task and device, starting the task acquiring data, and destroying said task. Creating the task comprises allocating an attribute database comprising a plurality of attribute objects corresponding to the attributes of the data acquisition device and an attribute table referencing the plurality of attribute objects. The attribute objects comprise environment data containing values of the attributes and a function for setting the values of the attributes. The attribute table comprises attribute table entries. Each of the attribute table entries references a respective attribute object. The attribute table is indexed by a portion of a unique attribute number associated with each of the attributes. The lookup time associated with invoking the attribute setting function is constant regardless of a number of the attributes. Each attribute has an associated unique number portions of which specifies the datatype and I/O type of the attribute, when the attribute may be set, and the index of the attribute into the appropriate attribute table. A new attribute may be added to the API and existing applications may link to or invoke functions of the new API without modification.

Claims

1. An attribute-based method for performing data acquisition in a data acquisition system comprising a data acquisition device having characteristic attributes, the method comprising:

creating a task for controlling the data acquisition device, wherein said creating comprises allocating an attribute database comprising a plurality of attribute objects corresponding to the attributes of the data acquisition device, wherein each of said attribute objects comprises environment data including values of said attributes and a function for setting said values of said attributes, wherein said attribute database further comprises an attribute table referencing said plurality of attribute objects;

setting said values of said attributes to configure the data acquisition device or the task according to a desired configuration;

controlling said task to perform a data acquisition function, wherein said task operates according to said values of said attributes.

2. The method of claim 1, wherein said attribute table comprises attribute table entries, wherein each of said attribute table entries references a respective attribute object wherein said attribute table is indexed by a portion of a unique attribute number associated with each of said attributes.

3. The method of claim 1, wherein said attribute database comprises a plurality of attribute tables, wherein said attribute database further comprises an I/O type table referencing said plurality of attribute tables, wherein said I/O type table is indexed by a portion of a unique attribute number associated with each of said attributes.

4. The method of claim 3, wherein said attribute database comprises a plurality of I/O type tables, wherein said attribute database further comprises a device table referencing said plurality of I/O type tables, wherein said device table is indexed by a device number associated with the data acquisition device, wherein said task is configured to control one or more of said data acquisition devices.

5. The method of claim 1, wherein said creating said task further comprises device interface software returning to a data acquisition application a task ID associated with said task for referencing said attribute database.

6. The method of claim 1, wherein said setting said attribute values further comprises invoking said function for setting said values of said attributes included by said environment data.

7. The method of claim 6, wherein said invoking said function has an associated lookup time, wherein said lookup time is constant regardless of a number of said attributes.

8. The method of claim 1, wherein said controlling said task comprises one or more of the group comprising starting, pausing, resuming and clearing said task.

9. The method of claim 1, further comprising getting said values of said attributes, wherein said function is also for getting said values of said attributes.

10. The method of claim 1, wherein said creating said task comprises a data acquisition application passing a task string to device interface software, wherein said task string specifies a device number and an I/O type of the data acquisition device.

11. The method of claim 1, wherein a unique attribute number is associated with each of said attributes, wherein a portion of said attribute number specifies a datatype of said attribute.

12. The method of claim 1, wherein a unique attribute number is associated with each of said attributes, wherein a portion of said attribute number specifies when said attribute may be set relative to said controlling said task.

13. The method of claim 1, wherein said destroying said task comprises freeing memory allocated for said attribute database.

14. The method of claim 13, further comprising destroying said task.

15. The method of claim 1, wherein said attributes comprise one or more from the group consisting of:

a range of input values to be acquired by the data acquisition device;

a manner of coupling the data acquisition device to field signals;

an input mode of acquired signals;

one or more acquisition trigger related attributes;

buffer related attributes;

channel clock attributes; and

input value scaling attributes.

16. A data acquisition system, comprising:

a data acquisition device having characteristic attributes;

a system memory configured to store a task for controlling the data acquisition device, wherein said system memory stores an attribute database comprising a plurality of attribute objects corresponding to the attributes of the data acquisition device, wherein each of said attribute objects comprises environment data including values of said attributes and a function for setting said values of said attributes, wherein said attribute database her comprises an attribute table referencing said plurality of attribute objects; and

a processor operably coupled to said data acquisition device and said system memory and configured to set said values of said attributes to configure the data acquisition device or the task according to a desired configuration, and control said task to perform a data acquisition function, wherein said task operates according to said values of said attributes.

17. The system of claim 16, wherein said attribute table comprises attribute table entries, wherein each of said attribute table entries references a respective attribute object, wherein said attribute table is indexed by a portion of a unique attribute number associated with each of said attributes.

18. The system of claim 16, wherein said attribute database comprises a plurality of attribute tables, wherein said attribute database further comprises an I/O type table referencing said plurality of attribute tables, wherein said I/O type table is indexed by a portion of a unique attribute number associated with each of said attributes.

19. The system of claim 18, wherein said attribute database comprises a plurality of I/O type tables, wherein said attribute database further comprises a device table referencing said plurality of I/O type tables, wherein said device table is indexed by a device number associated with said data acquisition device, wherein said task is configured to control one or more of said data acquisition devices.

20. The system of claim 16, wherein said processor executes said function for setting said values of said attributes included by said environment data to set said attribute values.

21. The system of claim 16, wherein said processor further gets said values of said attributes, wherein said function is also for getting said values of said attributes.

22. The system of claim 16, wherein said processor further destroys said task by freeing memory allocated for said attribute database.

23. The system of claim 16, wherein a unique attribute number is associated with each of said attributes, wherein a portion of said attribute number specifies a datatype of said attribute.

24. The system of claim 16 wherein a unique attribute number is associated with each of said attributes, wherein a portion of said attribute number specifies when said attribute may be set relative to said processor controlling said task to perform said data acquisition function.

25. A data acquisition system, comprising:

a data acquisition device having characteristic attributes;

a system memory configured to store instructions; and

a processor operably coupled to said data acquisition device and said system memory and configured to execute said instructions stored in said system memory;

wherein said instructions stored in said memory are operable to execute on said processor to;

create a task for controlling said data acquisition device, wherein said task comprises allocating an attribute database comprising,

a plurality of attribute objects corresponding to said attributes of said data acquisition device, wherein each of said attribute objects comprises environment data including values of said attributes and a function for setting said values of said attributes; and

an attribute table referencing said plurality of attribute objects;

set said values of said attributes;

control said task; and

destroy said task.

26. A data acquisition system, comprising:

a data acquisition device having characteristic attributes;

a system memory configured to store instructions;

means for creating a task for controlling the data acquisition device, wherein said means for creating is operable to allocate an attribute database comprising a plurality of attribute objects corresponding to the attributes of the data acquisition device, wherein each of said attribute objects comprises environment data including values of said attributes and a function for setting said values of said attributes, wherein said attribute database further comprises an attribute table referencing said plurality of attribute objects;

means for setting said values of said attributes to configure the data acquisition device or the task according to a desired configuration; and

means for controlling said task to perform a data acquisition function, wherein said task operates according to said values of said attributes.

27. A computer-readable storage media for operating in a computer system, the computer system including a data acquisition device having characteristic attributes and a processor operably coupled to said data acquisition device, wherein the storage media includes a substrate having a physical configuration representing data, the storage media comprising:

instructions for creating a task for controlling said data acquisition device comprising allocating an attribute database comprising;

a plurality of attribute objects corresponding to said attributes of said data acquisition device, wherein each of said attribute objects comprises environment data containing values of said attributes and a function for setting said values of said attributes; and

an attribute table referencing said plurality of attribute objects;

instructions for setting said values of said attributes;

instructions for controlling said task; and

instructions for destroying said task.

28. The media of claim 27, wherein said attribute table comprises attribute table entries, wherein each of said attribute table entries references a respective attribute object, wherein said attribute table is indexed by a portion of a unique attribute number associated with each of said attributes.

29. The media of claim 27, wherein said attribute database comprises a plurality of attribute tables, wherein said attribute database further comprises an I/O type table referencing said plurality of attribute tables, wherein said I/O type table is indexed by a portion of a unique attribute number associated with each of said attributes.

30. The media of claim 27, wherein said instructions for creating said task further comprises device interface software instructions which return to a data acquisition application a task ID associated with said task for referencing said attribute database.

31. The media of claim 27, wherein said instructions for setting said attribute values further comprise instructions for invoking said function for setting said values of said attributes contained by said environment data.

32. The media of claim 27, wherein said instructions for controlling said task comprises instructions for one or more of the group comprising starting, pausing, resuming and clearing said task.

33. The media of claim 27, further comprising instructions for getting said values of said attributes, wherein said function is also for getting said values of said attributes.

34. The media of claim 27, wherein said instructions for destroying said task comprises instructions for freeing memory allocated for said attribute database.

35. The media of claim 27, wherein said instructions for creating said task comprise data acquisition application instructions for passing a task string to device interface software, wherein said task string specifies a device number and an I/O type of said data acquisition device.

36. The media of claim 27, wherein a unique attribute number is associated with each of said attributes, wherein a portion of said attribute number specifies a datatype of said attribute.

37. The media of claim 27, wherein a unique attribute number is associated with each of said attributes, wherein a portion of said attribute number specifies when said attribute may be set relative to said controlling said task.