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Remote Alarm Signaling Apparatus

IP.com Disclosure Number: IPCOM000076441D
Original Publication Date: 1972-Mar-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Related People

Pinasco, G: AUTHOR

Abstract

This apparatus employs the contact monitoring capability of the IBM 2750 Voice and Data Switching System to display the alarm status in N remote buildings on an alarm board.

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Remote Alarm Signaling Apparatus

This apparatus employs the contact monitoring capability of the IBM 2750 Voice and Data Switching System to display the alarm status in N remote buildings on an alarm board.

Each building signals a general alarm whenever at least one of its K possible particular alarms is present in the building. Therefore, the alarm board includes for each building, a lamp for general alarm and K lamps for the particular alarms.

The contact sensing (CS) and the contact operating (CO) features installed inside the 2750, can be addressed either by an external scanner (off-line operation) or by a remote Data Processing (DP) System connected to the 2750 via a Binary Synchronous Communication Adapter (BSCA).

In the first case, a scanner polls cyclically for a time slot each of the N buildings via one of the N CS lines. At each polling, if the contact of general alarm is sensed closed that means either that no alarm is present or there is no change in the current alarm situation. If the contact is sensed open, the 2750 addresses a combination of two CO, selected one among the X CO and the other among the Y CO (with X x Y > or = N). The matrix emits a command to turn on the corresponding lamp of general alarm in the alarm board for the polled building and to open the associated gate. The K CS lines report the status of the particular alarms of that building to the 2750, which via K CO circuits turns on the interested lamps of particular alarms. The logi...