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Development of a visual display and control system.

Authors
Anonymous
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, Contract J0177020, 1980 Oct; :1-28
NIOSHTIC No.
10002144
Abstract
The object of this program was to extend the capabilities of visual paging systems both in size and functions in mines. The system developed uses the mine pager phone line for communication, monitoring, and remote control. A central station, using a minicomputer, transmits signals by phase inversion modulation of a 16,384-hz carrier to as many as 999 remote units. The remote unit addressed returns an echo to indicate that it is functioning and, in the case of monitor units, to convey the monitor data. Magnetically latched display disks, which can be seen from both sides when posted, are used for visual paging. Lists of the addresses of posted pages, unanswered pages, and nonechoing units are prepared by the central station computer. The system was designed to be intrinsically safe and should operate for 3 months on a 12-volt lantern battery.
Keywords
Mine communicators; Visual paging; Phone line; Mine monitoring and control; Supervisory feedback
Publication Date
19801001
Document Type
CP; Final Contract Report
Fiscal Year
1981
NTIS Accession No.
PB81-222374
NTIS Price
A04
Identifying No.
OFR 78-81; Contract-J0177020
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, Contract J0177020
State
MA; PA
Performing Organization
Arthur D. Little, Inc.
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