Northern Telecom Limited

Kenny Y Ng

David P Schenkel

Alastair A Warwick

Fault checking of slave devices. All the slave devices are polled periodically by a master control circuit and their reponse is noted. The master control circuit asserts a control signal for every other poll so as to cause the slave device to invert the bits in its response signal when the control signal is asserted. The non-inversion of the bits during the period of several polls is indicative of either a fault condition or a device not present condition.

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Nepean, Canada

Kenny Y Ng