System for detecting the presence in a rack of a portable unit s

Details System for detecting the presence in a rack of a portable unit s System for detecting the presence in a rack of a portable unit s

1991-06-07

1993-03-16

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082544, 340568, 235385, H04B 700

Patent

active

051948567

ABSTRACT:
A system for detecting the presence in a compartment of a rack of a portable transmission unit of a number of portable transmission units, each being capable for transmitting or for receiving a signal containing an identification number assigned to the unit. All compartments of the rack or only compartments receiving or having received the units therein are scanned. The presence of a unit in a compartment is acknowledged by the unit after it has received a scanning signal, being identical for each scanned compartment, by providing a response signal comprising the identification number assigned to the unit. For each unit which is present, or until the actual scanning thereof was present, in a compartment a control circuit updates a datum, indicating the presence of the unit in a compartment, in a memory. Updating of the datum for absence can be carried out if a response signal is not received within a predetermined time or if a detection means, assigned individually to each compartment, detects a removement from a compartment for which a presence datum was set before.

REFERENCES:
patent: 3808538 (1974-04-01), Goransson et al.
patent: 3973200 (1976-08-01), Akerberg
patent: 4595922 (1986-06-01), Cobb et al.
patent: 4636634 (1987-01-01), Harper et al.
patent: 4636950 (1987-01-01), Caswell et al.
patent: 4661806 (1987-04-01), Peters et al.

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