Excavating
Patent
1994-12-01
1997-01-07
Beausoliel, Jr., Robert W.
Excavating
371 205, G01R 3128, G06F 1100
Patent
active
055926150
ABSTRACT:
In an apparatus having a main control section and sub-control sections connected to the control section through communication lines for executing desired operations by means of mutual intercommunication with the control section through the communication lines, first and second tri-state buffers are provided between the communication lines and the main control section and between the communication lines and the sub-control section respectively. The tri-state buffers short the communications lines by respective test signals output from the main control sections. When the test signal is not retransmitted to the control section through the communication lines shorted by the second tri-state buffer, anomalous operation of the sub-control section is detected. When the test sinal is not retransmitted to the control section through the communication lines shorted by the first tri-state buffer, anomalous operation of the main control section is detected.
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Beausoliel, Jr. Robert W.
Minolta Co. , Ltd.
Snyder Glenn
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