Development of a visual display and control system

Details

• Corporate Authors:
  Arthur D. Little, Inc. ; United States. Bureau of Mines. Pittsburgh Mining and Safety Research Center
• Description:
  "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." - NIOSHTIC-2
• Subjects:
  Occupational Health Safety
• Series:
  Mining Publications
• Subseries:
  Open File Report
• Document Type:
  Text
• Funding:
  contract J0177020
• Genre:
  Report
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  28 unnumbered pages
• NIOSHTIC Number:
  nn:10002144
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:5725c456e8e6f9debc4722781bb1b50aa55616d5a9f10654d546c484902a60da9c75ba8a7b8e4c4edf9e4420eb2c30e2c5d34b2eab15a44e2c9efe217dbf03db
• Download URL:
  https://stacks.cdc.gov/view/cdc/9039/cdc_9039_DS1.pdf
• File Type:
  [PDF - 1.34 MB ]