EP 1031209 A1 20000830 - 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
Application
Priority
- GB 9803316 W 19981105
- GB 9723557 A 19971108
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
IPC 8 full level
H04L 12/28 (2006.01); H04L 12/413 (2006.01); B60R 16/02 (2006.01); B60R 16/03 (2006.01)
CPC (source: EP)
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)
Citation (search report)
See references of WO 9925097A1
Designated contracting state (EPC)
DE ES FR GB IT NL
DOCDB simple family (publication)
WO 9925097 A1 19990520; AU 1040799 A 19990531; EP 1031209 A1 20000830; GB 9723557 D0 19980107
DOCDB simple family (application)
GB 9803316 W 19981105; AU 1040799 A 19981105; EP 98952859 A 19981105; GB 9723557 A 19971108