Global Patent Index - EP 1031209 A1

EP 1031209 A1 2000-08-30 - BUS LOADING METER USING DIGITAL ENVELOPE DETECTOR

Title (en)

BUS LOADING METER USING DIGITAL ENVELOPE DETECTOR

Title (de)

BUSLEISTUNGSMESSER MIT DIGITALEN HÜLLKURVENDETEKTOR

Title (fr)

APPAREIL DE MESURE DE LA CHARGE DE BUS UTILISANT UN DETECTEUR D'ENVELOPPE NUMERIQUE

Publication

EP 1031209 A1 (EN)

Application

EP 98952859 A

Priority

  • GB 9803316 W
  • GB 9723557 A

Abstract (en)

[origin: WO9925097A1] A bus loading meter for a controller area network (CAN) comprises a CAN transceiver (10) which converts an incoming CAN signal to a standard digital (TTL) signal. A counter (20) is provided for capturing the start-of-frame (SOF) and end-of-frame (EOF) of the signal by calculating the number of recessive bits present before a dominant bit (to determine the SOF) and after a dominant bit (to determine the acknowledgement slot) which is followed by seven successive recessive bits indicating the EOF. The meter further comprises a message frame converter (30) which is triggered by receipt of a start pulse from the counter (20) to start counting. Such counting is subsequently terminated on receipt of an end pulse from the counter (20) which resets the converter (30). A message envelope is formed at the output of the converter (30) which is supplied to a volt meter (40) providing a visual indication of the percentage bus loading. The converter (30) is controlled by a frequency switch (32) supplied by a crystal oscillator.

IPC 1-7 (main, further and additional classification)

H04L 12/26; H04L 12/413; B60R 16/02

IPC 8 full level (invention and additional information)

H04L 12/28 (2006.01); H04L 12/413 (2006.01); B60R 16/02 (2006.01); B60R 16/03 (2006.01)

CPC (invention and additional information)

H04L 12/4135 (2013.01); H04L 43/00 (2013.01); B60R 16/0315 (2013.01); H04L 43/0852 (2013.01); H04L 43/0882 (2013.01); H04L 43/16 (2013.01); H04L 2012/40215 (2013.01)

Designated contracting state (EPC)

DE ES FR GB IT NL

EPO simple patent family

WO 9925097 A1 19990520; AU 1040799 A 19990531; EP 1031209 A1 20000830; GB 9723557 D0 19980107

INPADOC legal status


2003-01-02 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20020601

2002-04-17 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20020305

2000-08-30 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000517

2000-08-30 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE ES FR GB IT NL