Busline length recognition system

Details Busline length recognition system Busline length recognition system

1994-11-02

1998-10-27

Harvey, Jack B.

G06F 1300

Patent

active

058288503

ABSTRACT:
A delay gate is provided within a control unit to delay the reset signal by a predetermined period of time to monitor the time at which the reset signal passes through the busline. If the busline length exceeds a prescribed length, then an LED is turned on. Or a resistance proportional to the length of a duplex bus signal line is connected to each connecting portion, a reference resistance is provided internally of the control unit and one of the duplex signal buslines of the connecting portion is grounded while the other is connected through the reference resistance to a reference power supply to compare the potential difference between the reference resistance and the connecting point of the duplex signal busline with a reference signal so that, when the busline length exceeds a prescribed value, the LED is turned on. As a result, when the user daisy-chains the components freely, it becomes possible to inform whether the entire line length has been exceeded or not, and therefore, unstable operation of the system leading to the occurrence of troubles can be prevented. Further, even if the connecting portions or the terminal resistance module is disconnected, it can be informed to the user.

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patent: 5179341 (1993-01-01), Whiteside
patent: 5261060 (1993-11-01), Free
patent: 5321632 (1994-06-01), Otsuji et al.

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