System and method for improved transmission of meter data

• US 7,239,250 B2
• Filed: 04/26/2004
• Issued: 07/03/2007
• Est. Priority Date: 04/26/2004
• Status: Active Grant

• Current Assignee: Elster Electricity LLC (Honeywell International Inc.)
• Original Assignee: Elster Electricity LLC (Honeywell International Inc.)
• Inventors: Borleske, Andrew J., Mason, Robert T. Jr., Brian, Brent R.
• Primary Examiner(s): Edwards, Jr.; Timothy
• Application Number:
  US10/832,037
• Publication Number:
  US 20050237221A1
• Time in Patent Office: 1,163 Days
• Field of Search: 340/870.02, 340/870.07, 709/219, 702/56, 702/57
• US Class Current: 340/870.02
• CPC Class Codes: H04L 67/12 specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
• CPC Class Codes: H04Q 9/00 Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom

Abstract

The system includes a number of first meters, which are typically battery powered transmit only devices. The system includes a number of two-way meters, which are operable to both transmit and receive data. The first meters transmit their data to the collector either directly or indirectly via the two-way meters, which serve as intermediaries. Multiple records from each first meter may be stored at each of the two-way meters, thereby ensuring that records from a one-way meter will not be blocked when an attempt is made to forward them to the collector. Furthermore, multiple records from each first meter may be stored at the collector, thereby enabling the transmission and storage of meter records in a number of different formats. Additionally, records from each first meter are marked to reflect a sequence in which they are generated, thereby ensuring that the collector will store the most recent data records available.

Claims

1. A method for collecting a device record generated at a first device, the device record comprising a sequence number identifying a sequence in which the device record is generated, the method comprising:

receiving the device record at a collector;

determining whether the received device record has a same data format as an existing device record from the first device already stored at the collector;

if not, then storing the received device record at the collector;

if so, then;

comparing the sequence number of the received device record with a sequence number of the existing device record;

storing the received device record at the collector if the sequence number of the received device record is greater than the sequence number of the existing device record; and

discarding the received device record if the sequence number of the received device record is less than the sequence number of the existing device record.

2. The method of claim 1, comprising receiving the device record at the collector from the first device, which is a one-way meter device.

3. The method of claim 1, comprising receiving the device record at the collector from the first device, which is a battery powered meter device.

4. The method of claim 1, comprising receiving the device record at the collector from the first device, which is a two-way meter device.

5. The method of claim 1, comprising receiving the device record at the collector directly from the first device.

6. The method of claim 1, further comprising timestamping the device record at the collector.

7. The method of claim 1, wherein storing the received device record at the collector comprises storing the received device record along with previous received device records from the first device.

8. The method of claim 1, comprising receiving the device record at a plurality of collectors.

9. The method of claim 8, further comprising transmitting device data from the plurality of collectors to a server.

10. The method of claim 1, comprising receiving the device record at the collector indirectly from the first device via an intermediate two-way device.

11. The method of claim 10, wherein receiving the device record at the collector indirectly from the first device via an intermediate two-way device comprises:

performing a periodic read of the intermediate two-way device;

detecting that at least one device record from at least one first device is available; and

sending a request for each of the detected device records until all of the detected device records have been retrieved at the collector.

12. The method of claim 10, further comprising timestamping the device record at the intermediate two-way device.

13. The method of claim 11, further comprising:

upon receiving the time stamped device record at the collector, comparing the received timestamped device record to another time stamped device record already stored at the collector;

determining that the other timestamp is invalid; and

overwriting the other timestamped device record with the received timestamped device record.

14. A method for transmitting a device record generated at a first device, the method comprising:

receiving the device record at a two-way device from the first device;

storing the device record at the two-way device in one of a plurality of memory locations implemented as a circular table whereby a number of memory writes to each particular memory location is minimized;

transmitting from the two-way device to the collector an exception message that includes the device record, the exception message being allocated an exception window that is subset of a repeating time interval;

if the exception message is successfully received by the collector, then receiving from the collector an acknowledgement of successful receipt; and

if the exception message is not successfully received by the collector, then the receiving from the collector a request for the device record, the request being issued as part of the collector'"'"'s periodic read of data from both two-way and one-way device records.

15. The method of claim 14, comprising receiving the device record at the two-way device from the first device, which is a one-way meter device.

16. The method of claim 14, comprising receiving the device record at the two-way device from the first device, which is a battery powered meter device.

17. The method of claim 14, comprising receiving the device record at the two-way device from the first device, which is a two-way meter device.

18. The method of claim 14, further comprising timestamping the device record at the two-way device.

19. The method of claim 14, further comprising:

receiving at the two-way device from a collector a first request to read the device record;

transmitting the device record from the two-way device to the collector;

receiving at the two-way device from the collector a second request for a next device record associated with the first device, the second request comprising instructions to clear the previously transmitted device record from its memory location at the two-way device; and

clearing the previously transmitted device record from its memory location at the two-way device.

20. The method of claim 19, further comprising recursively transmitting device records from the two-way device to the collector until all device records associated with the first device are cleared from the memory at the two-way device.

21. An automated device reading system comprising:

a first device that generates and transmits a device record comprising a sequence number identifying a sequence in which the device record is generated; and

a collector that receives the device record from the one way device, compares a data format of the received device record to a data format of an existing device record from the first device already stored at the collector, stores the received device record if it has a different data format than the existing device record, stores the received device record if it has a same data format as the existing device record and its sequence number is greater than a sequence number of the existing device record, and discards the received device record if it has the same data format as the existing device record and its the sequence number is less than the sequence number of the existing device record.

22. The system of claim 21, wherein the first device is a one-way meter device.

23. The system of claim 21, wherein the first device is a battery powered meter device.

24. The system of claim 21, wherein the first device is a two-way meter device.

25. The system of claim 21, wherein the device record further comprises a first data format code identifying a data format of the device record.

26. The system of claim 21, wherein the collector timestamps the device record when the device record is received by the collector.

27. The method of claim 21, wherein the collector is one of a plurality of collectors receiving the device record.

28. The method of claim 27, further comprising a server that receives device data from the plurality of collectors.

29. The system of claim 21, further comprising an intermediate two-way device that relays the device record from the first device to the collector.

30. The system of claim 29, wherein the intermediate two-way device timestamps the device record when the device record is received by the intermediate two-way device.

31. An automated device reading system comprising:

a first device that generates and transmits a device record;

a two-way device that receives the device record from the first device, stores the device record in one of a plurality of memory locations implemented as a circular table whereby a number of memory writes to each particular memory location is minimized, and transmits to a collector an exception message that includes the device record, the exception message being allocated an exception window that is a subset of a repeating time interval; and

the collector configured to communicate with the two-way device whereby, if the collector successfully receives the exception message, then the collector sends to the two-way device an acknowledgement of successful receipt, and, if the collector does not successfully receive the exception message, then the collector issues to the two-way device a request for the device record, the request being issued as part of the collector'"'"'s periodic read of data from both two-way and one-way device records.

32. The system of claim 31, wherein the first device is a one-way meter device.

33. The system of claim 31, wherein the first device is a battery powered meter device.

34. The system of claim 31, wherein the first device is a two-way meter device.

35. The system of claim 31, wherein the two-way device timestamps the device record when the device record is received by the two-way device.

36. A processor-readable medium having stored thereon instructions that, when executed by a processor at a collector, causing the processor at said collector to:

receive a device record generated at a first device, the device record comprising a sequence number identifying a sequence in which the device record is generated;

determine whether the received device record has a same data format as an existing device record from the first device already stored at the collector;

if not, then storing the received device record at the collector;

if so, then;

compare the sequence number of the received device record with a sequence number of the existing device record;

store the received device record at the collector if the sequence number of the received device record is greater than the sequence number of the existing device record; and

discard the received device record if the sequence number of the received device record is less than the sequence number of the existing device record.

37. The processor-readable medium of claim 36, wherein the first device is a one-way meter device.

38. The processor-readable medium of claim 36, wherein the first device is a battery powered meter device.

39. The processor-readable medium of claim 36, wherein the first device is a two-way meter device.

40. The processor-readable medium of claim 36, wherein the device record further comprises a first data format code identifying a data format of the device record.

41. The processor-readable medium of claim 36, wherein the instructions further cause the processor to timestamp the device record when the device record is received by the collector.

42. The processor-readable medium of claim 36, wherein the collector is one of a plurality of collectors receiving the device record.

43. The processor-readable medium of claim 42, further comprising a server that receives device data from the plurality of collectors.

44. The processor-readable medium of claim 36, further comprising an intermediate two-way device that relays the device record from the first device to the collector.

45. The processor-readable medium of claim 44, wherein the intermediate two-way device timestamps the device record when the device record is received by the intermediate two-way device.

46. The processor-readable medium of claim 45, wherein the instructions further cause the processor to

upon receiving the timestamped device record at the collector, compare the received timestamped device record to another timestamped device record already stored at the collector;

determine that the other timestamp is invalid; and

overwrite the other timestamped device record with the received timestamped device record.

47. A processor-readable medium having stored thereon instructions that, when executed by a processor at a two-way device, causing the processor at said two-way device to:

receive a device record generated at a first device;

store the device record in one of a plurality of memory locations implemented as a circular table whereby a number of memory writes to each particular memory location is minimized;

transmitting from the two-way device to the collector an exception message that includes the device record, the exception message being allocated an exception window that is subset of a repeating time interval;

if the exception message is successfully received by the collector, then receiving from the collector an acknowledgement of successful receipt; and

if the exception message is not successfully received by the collector, then receiving from the collector a request for the device record, the request being issued as part of the collector'"'"'s periodic read of data from both two-way and one-way device records.

48. The processor-readable medium of claim 47, wherein the first device is a one-way meter device.

49. The processor-readable medium of claim 47, wherein the first device is a battery powered meter device.

50. The processor-readable medium of claim 47, wherein the first device is a two-way meter device.

51. The processor-readable medium of claim 47, wherein the instructions further cause the processor to timestamp the device record when the device record is received by the two-way device.