Detector for colliding signals in asynchronous communication

Details Detector for colliding signals in asynchronous communication Detector for colliding signals in asynchronous communication

1990-07-06

1991-08-27

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082554, 370 852, 370 853, 328111, 307520, 307234, H04J 302, H04B 110

Patent

active

050437224

ABSTRACT:
A communications system has an active master node which transmits request messages in serial bit fashion on a data bus, and a plurality of responder nodes each of which receives the request messages on the data bus and may respond to a request message with a serial bit answer message. The possiblity exists that a plurality of responder nodes may provide concurrent answer messages forming a composite signal which the active master node may not be able to recognize as containing answer messages. A low pass filter is provided in the active master node which provides as its output only those pulses in the composite signal whose length is within a predetermined interval, typically from approximately a tenth to one half of the interval for each bit in the answer messages. A counter receives the low pass filter output and provides a collision signal to the associated master node if more than a preselected number of pulses within the predetermined interval are present. By providing the collision signal only after detecting a plurality of these pulses in the low pass filter output, it is possible to avoid false detection of concurrent answer messages whose presence is simulated by noise on the line.

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