Handheld communication tester and method for testing direct serial communication capability of an intelligent electronic device in a power system

• US 20070058320A1
• Filed: 09/14/2005
• Published: 03/15/2007
• Est. Priority Date: 09/14/2005
• Status: Active Grant

• Current Assignee: Schweitzer Engineering Laboratories, Incorporated
• Original Assignee: Schweitzer Engineering Laboratories, Incorporated
• Inventors: Lee, Tony
• Granted Patent: US 7,460,590 B2
• Time in Patent Office: Days
• US Class Current: 361/157
• CPC Class Codes: H02H 1/0061 concerning transmission of signals transmission of measured quantities or switching orders; sectionalised protection involving signal transmission between at least two stations H02H7/261; comparison of the voltage or current values at two spaced portions of a single system H02H3/28; transferring the output of a sensing member to another variable G01D5/00; electrical measuring arrangements using modulation of electromagnetic waves, e.g. light beams G01R15/24, G01R15/26

Abstract

Provided is a handheld communication tester and method for testing direct serial communication capability of an IED. The first IED includes an equal plurality of transmit bit channels and receive bit channels. The handheld communication tester includes a housing sized for single-hand portability, a connector disposed in a wall of the housing and adapted for connection to the IED or a serial communication link to the IED, and a microcontroller disposed inside of the housing and operatively coupled to the connector. The microcontroller is programmed to detect synchronization with the IED, to automatically detect and store a Baud rate of the IED, automatically detect and store a transmit identification of the IED, and automatically detect and store a receive identification of the IED. The transmit identification is used to encode transmissions from the IED, and the receive identification is used to encode transmissions received by the IED.

Claims

1. A handheld communication tester for testing direct serial communication capability of a first intelligent electronic device (IED) in a power system, the first IED including a plurality of transmit bit channels and a plurality of receive bit channels, the handheld communication tester comprising:

a housing including a connector adapted for connection to the first IED; and

a microcontroller disposed inside of the housing and operatively coupled to the connector and a power source, the microcontroller including a microprocessor and a memory operatively coupled to the microprocessor, the microcontroller being programmed to;

detect connection with the first IED,

automatically detect and store a Baud rate of the first IED, and

automatically detect and store at least one identification of the first IED.

2. The handheld communication tester of claim 1, wherein the at least one identification of the first IED is selected from the group consisting of a transmit identification of the first IED and a receive identification of the first IED.

3. The handheld communication tester of claim 2, wherein the transmit identification of the first IED is used to encode transmissions from the first IED, and wherein the receive identification of the first IED is used to decode transmissions received by the first IED.

4. The handheld communication tester of claim 1, wherein the microcontroller is further programmed to cause a visual indication upon detecting synchronization with the first IED.

5. The handheld communication tester of claim 1, wherein the first IED is configured for mirrored bits communication, and wherein the serial communication link is adapted to enable bi-directional mirrored bits communication with a second IED, mirrored bits communication enabling output status bits, digitized analog values and virtual terminal data allocated to the plurality of transmit bit channels to be serially transmitted from the first IED to the second IED for use by the second IED.

6. The handheld communication tester of claim 1, further comprising:

a first plurality of light emitting diodes, one of each of the first plurality of light emitting diodes corresponding to one of each of the plurality of receive bit channels;

a second plurality of light emitting diodes, one of each of the second plurality of light emitting diodes corresponding to one of each of the plurality of transmit bit channels; and

a liquid crystal display,

each of the first plurality of light emitting diodes, the second plurality of light emitting diodes and the liquid crystal display operatively coupled to the microcontroller and disposed on the housing for easy viewing.

7. The handheld communication tester of claim 6, further comprising:

a number of pushbuttons, each of the number of pushbuttons corresponding to one of each of the second plurality of light emitting diodes;

a memory card slot; and

an ON/OFF switch,

each of the number of pushbuttons, the memory card slot and the ON/OFF switch operatively coupled to the microcontroller and disposed on the housing for easy access by an operator.

8. The handheld communication tester of claim 7, wherein the microcontroller is further programmed to illuminate selected light emitting diodes of the second plurality of light emitting diodes in response to actuation of corresponding pushbuttons of the number of pushbuttons, an illuminated light emitting diode of the second plurality of light emitting diodes indicating a binary high value for a bit of a corresponding transmit bit channel.

9. The handheld communication tester of claim 7, wherein the microcontroller is further programmed to illuminate selected light emitting diodes of the first plurality of light emitting diodes, an illuminated light emitting diode of the first plurality of light emitting diodes indicating a binary high value for a bit of a corresponding receive bit channel.

10. The handheld communication tester of claim 1, wherein the microcontroller is further programmed to:

(a) select a pre-programmed Baud rate from a number of pre-programmed Baud rates;

(b) receive an IED transmit stream from the first IED;

(c) compare the received IED transmit stream at the selected pre-programmed Baud rate to a predictable pattern of characters;

(d) store the pre-programmed Baud rate in a first memory location as the Baud rate if the predictable pattern of characters is recognized in the received IED transmit stream at the selected pre-programmed Baud rate; and

(e) repeat steps (a)-(c) if the predictable pattern of characters is not recognized in the received IED transmit stream at the selected pre-programmed Baud rate.

11. The handheld communication tester of claim 10, wherein the microcontroller is further programmed to:

detect the transmit identification of the first IED in the predictable pattern of characters recognized in the received IED transmit stream; and

store the transmit identification in a second memory location.

12. The handheld communication tester of claim 1, wherein the microcontroller is further programmed to:

(a) select a pre-programmed receive identification from a number of pre-programmed receive identifications;

(b) encode a valid code word with the pre-programmed receive identification to form an encoded valid word;

(c) transmit the encoded valid word to the first IED;

(d) store the pre-programmed receive identification in a third memory location as the receive identification if a valid respond code word is received from the first IED; and

(e) repeat steps (a)-(c) if the valid respond code word is not received from the first IED.

13. The handheld communication tester of claim 1, wherein the connector comprises a subminiature 9-pin connector.

14. A handheld communication tester for testing direct serial communication capability of a first intelligent electronic device (IED) in a power system, the first IED including a plurality of transmit bit channels and a plurality of receive bit channels, the handheld communication tester comprising:

a housing sized for single-hand portability;

a connector disposed in a wall of the housing, the connector adapted for connection to the first IED or to a serial communication link to the first IED; and

a microcontroller disposed inside of the housing and operatively coupled to the connector and a power source, the microcontroller including a microprocessor and a memory operatively coupled to the microprocessor, the microcontroller being programmed to;

detect operative connection with the first IED,

automatically detect and store a Baud rate of the first IED,

automatically detect and store a transmit identification of the first IED, the transmit identification used to encode transmissions from the first IED, and

automatically detect and store a receive identification of the first IED, the receive identification used to encode transmissions received by the first IED.

15. The handheld communication tester of claim 14, wherein the microcontroller is further programmed to cause a visual indication upon detecting synchronization with the first IED.

16. The handheld communication tester of claim 14, wherein the first IED is configured for mirrored bits communication, and wherein the serial communication link is adapted to enable bidirectional mirrored bits communication with a second IED, mirrored bits communication enabling output status bits, digitized analog values and virtual terminal data allocated to the plurality of transmit bit channels to be serially transmitted from the first IED to the second IED for use by the second IED.

17. The handheld communication tester of claim 14, further comprising:

a first plurality of light emitting diodes, one of each of the first plurality of light emitting diodes corresponding to one of each of the plurality of receive bit channels;

a second plurality of light emitting diodes, one of each of the second plurality of light emitting diodes corresponding to one of each of the plurality of transmit bit channels; and

a liquid crystal display,

each of the first plurality of light emitting diodes, the second plurality of light emitting diodes and the liquid crystal display operatively coupled to the microcontroller and disposed on the housing for easy viewing.

18. The handheld communication tester of claim 17, further comprising:

a number of pushbuttons, each of the number of pushbuttons corresponding to one of each of the second plurality of light emitting diodes;

a memory card slot; and

an ON/OFF switch,

each of the number of pushbuttons, the memory card slot and the ON/OFF switch operatively coupled to the microcontroller and disposed on the housing for easy access by an operator.

19. The handheld communication tester of claim 18, wherein the microcontroller is further programmed to illuminate selected light emitting diodes of the second plurality of light emitting diodes in response to actuation of corresponding pushbuttons of the number of pushbuttons, an illuminated light emitting diode of the second plurality of light emitting diodes indicating a binary high value for a bit of a corresponding transmit bit channel.

20. The handheld communication tester of claim 18, wherein the microcontroller is further programmed to illuminate selected light emitting diodes of the first plurality of light emitting diodes, an illuminated light emitting diode of the first plurality of light emitting diodes indicating a binary high value for a bit of a corresponding receive bit channel.

21. The handheld communication tester of claim 14, wherein the microcontroller is further programmed to:

(a) select a pre-programmed Baud rate from a number of pre-programmed Baud rates;

(b) receive an IED transmit stream from the first IED;

(c) compare the received IED transmit stream at the selected pre-programmed Baud rate to a predictable pattern of characters;

(d) store the pre-programmed Baud rate in a first memory location as the Baud rate if the predictable pattern of characters is recognized in the received IED transmit stream at the selected pre-programmed Baud rate; and

(e) repeat steps (a)-(c) if the predictable pattern of characters is not recognized in the received IED transmit stream at the selected pre-programmed Baud rate.

22. The handheld communication tester of claim 21, wherein the microcontroller is further programmed to:

detect the transmit identification of the first IED in the predictable pattern of characters recognized in the received IED transmit stream; and

store the transmit identification in a second memory location.

23. The handheld communication tester of claim 14, wherein the microcontroller is further programmed to:

(a) select a pre-programmed receive identification from a number of pre-programmed receive identifications;

(b) encode a valid code word with the pre-programmed receive identification to form an encoded valid word;

(c) transmit the encoded valid word to the first IED;

(d) store the pre-programmed receive identification in a third memory location as the receive identification if a valid respond code word is received from the first IED; and

(e) repeat steps (a)-(c) if the valid respond code word is not received from the first IED.

24. The handheld communication tester of claim 14, wherein the connector comprises a subminiature 9-pin connector.

25. A method for testing direct serial communication capability of a first intelligent electronic device (IED) in a power system, the first IED including a plurality of transmit bit channels and a plurality of receive bit channels, the method comprising:

providing a handheld communication tester having a housing, a connector adapted for connection to the first IED, and a microcontroller disposed inside of the housing and operatively coupled to the connector and a power source, the handheld communication tester sized for single-hand portability;

detecting connection with the first IED;

automatically detecting and storing a Baud rate of the first IED; and

automatically detecting and storing at least one identification of the first IED.

26. The method of claim 25, wherein the at least one identification of the first IED is selected from the group consisting of a transmit identification of the first IED and a receive identification of the first IED.

27. The method of claim 26, wherein the transmit identification of the first IED is used to encode transmissions from the first IED, and wherein the receive identification of the first IED is used to decode transmissions received by the first IED.

28. The method of claim 25, further comprising causing a visual indication upon detecting synchronization with the first IED.

29. The method of claim 25, wherein the first IED is configured for mirrored bits communication, and wherein the serial communication link is adapted to enable bidirectional mirrored bits communication with a second IED, mirrored bits communication enabling output status bits, digitized analog values and virtual terminal data allocated to the plurality of transmit bit channels to be serially transmitted from the first IED to the second IED for use by the second IED.

30. The method of claim 25, wherein the handheld communication tester further includes a first plurality of light emitting diodes, a second plurality of light emitting diodes, a number of pushbuttons, the first and second plurality of light emitting diodes corresponding to the plurality of receive and transmit bit channels, respectively, the method further comprising:

illuminating selected light emitting diodes of the second plurality of light emitting diodes in response to actuation of corresponding pushbuttons of the number of pushbuttons, an illuminated light emitting diode of the second plurality of light emitting diodes indicating a binary high value for a bit of a corresponding transmit bit channel; and

illuminating selected light emitting diodes of the first plurality of light emitting diodes, an illuminated light emitting diode of the first plurality of light emitting diodes indicating a binary high value for a bit of a corresponding receive bit channel.

31. The method of claim 25, further comprising:

(a) selecting a pre-programmed Baud rate from a number of pre-programmed Baud rates;

(b) receiving an IED transmit stream from the first IED;

(c) comparing the received IED transmit stream at the selected pre-programmed Baud rate to a predictable pattern of characters;

(d) storing the pre-programmed Baud rate in a first memory location as the Baud rate if the predictable pattern of characters is recognized in the received IED transmit stream at the selected pre-programmed Baud rate; and

(e) repeating steps (a)-(c) if the predictable pattern of characters is not recognized in the received IED transmit stream at the selected pre-programmed Baud rate.

32. The method of claim 31, further comprising:

detecting the transmit identification rate of the first IED in the predictable pattern of characters recognized in the received IED transmit stream; and

storing the transmit identification rate in a second memory location.

33. The method of claim 25, further comprising:

(a) selecting a pre-programmed receive identification from a number of pre-programmed receive identifications;

(b) encoding a valid code word with the pre-programmed receive identification to form an encoded valid word;

(c) transmitting the encoded valid word to the first IED;

(d) storing the pre-programmed receive identification in a third memory location as the receive identification if a valid respond code word is received from the first IED; and

(e) repeating steps (a)-(c) if the valid respond code word is not received from the first IED.

34. The method of claim 25, wherein the handheld communication tester further includes a display, the method further comprising alternating between displaying the Baud rate and displaying the transmit identification with the receive identification.