Flip status line

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1985-12-11

1987-12-08

Atkinson, Charles E.

Excavating

371 67, 371 70, G01R 3128

Patent

active

047122137

ABSTRACT:
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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patent: 4527115 (1985-07-01), Mehrotra et al.
patent: 4553225 (1985-11-01), Ohe

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