Power on, mated, and activity indicator for electronic devices i

Details Power on, mated, and activity indicator for electronic devices i Power on, mated, and activity indicator for electronic devices i

1995-09-28

1998-05-19

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

Specific condition

340502, 340686, 340687, 340332, 395835, G08B 2100

Patent

active

057541124

ABSTRACT:
The present invention signals the power on, mated, and activity status of storage units in a console rack-mounted memory system. The status is signalled using parallel-coupled LEDs activated by logically combined signals provided by a logic circuit using signals available from SCA connector pins that connect the storage units to the console rack. The SCA connector provides MATED1 (pin 44), MATED2 (pin 74), and LED ACTIVE (pin 77) signals that are logically ANDed by the logic circuits. A logic circuit lights an associated parallel-coupled LED pair for a storage unit when LIT=MATED.multidot.ACTIVE LED, where MATED=0 denotes grounded pins 74 and (optionally) 44, and ACTIVE LED=0 denotes grounded pin 77, and LIT=l denotes lit LEDs. A steadily lit LED pair denotes that a storage unit is mated into the console rack and is inactive. An intermittent LED pair denotes that the storage unit is mated into the console rack and is presently active (and thus should not be removed). If no LEDs are lit on the console-rack, then it is known that operating power is not being provided to the memory system.

REFERENCES:
patent: 3594784 (1971-07-01), Femminella
patent: 5379184 (1995-01-01), Barraza et al.

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