Digitally addressble electronic device with interchanged and inv

Details Digitally addressble electronic device with interchanged and inv Digitally addressble electronic device with interchanged and inv

1989-04-20

1991-11-12

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082507, 34028607, H04Q 514

Patent

active

050651544

ABSTRACT:
In a system comprising a plurality of digitally addressable electronic devices, all devices have the same construction and are designed for being connected in series to a common central monitoring station. The addressing of these devices is accomplished by a plurality of address lines which are connected to input contacts of the respective device. Within each device, a selection gate is connected to the input contacts which provides an enabling signal if the signal on said address lines has a predetermined bit pattern. Each device has output contacts connected to its input contacts to which the input contacts of a next device are connected. The address lines are connected from the input contacts to the output contacts of the device in such a way that the contacts are interchanged, and an inverter is inserted in one of said lines so that the bit pattern forming the address provided at the output contacts is different from the bit pattern received at the input contacts. Thus, along the system of series connected devices a plurality of different bit patterns is produced so that the position of the correct bit pattern to which the device selection means responds, is shifted along the series connected devices in order to address the device which is in a predetermined position. A preferred application of such devices is in medical surveillance systems in which a plurality of racks are connected serially together and to a center monitoring station, each rack being allocated to a different task and including the units which are needed to monitor the vital functions of a patient required for that task.

REFERENCES:
patent: 4016369 (1977-05-01), Petersen
patent: 4679192 (1987-07-01), Vandbrabant
"Basic Electronics Technology", Evans et al., 12/1985, p. 282.

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