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System for monitoring the movements of goods inwards and/or outwards

  • US 4,588,881 A
  • Filed: 07/11/1983
  • Issued: 05/13/1986
  • Est. Priority Date: 07/12/1982
  • Status: Expired due to Fees
First Claim
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1. System for monitoring the movement of goods inwards and/or outwards using a reading pen for scanning a marking such as a bar code characterizing an item of goods and transmitting first electrical signals corresponding to the bar code, comprising in combinationat least one portable terminal for processing the first electrical signals and also showing data corresponding to the electrical signals in a display for checking purposes, said terminal being positioned descretely from said reading pen and connected to said reading pen by connecting wires,a control centre with a memory,said terminal incorporating an integrated infrared transmitter in which the first electrical signals are modulated onto a carrier wave and transmitted as infrared signals,at least one converter with an infrared receiver adapted for converting the infrared signals into second electrical signals and including means for transmitting said second electrical signals to the control centre via connecting wires,means for returning said second electrical signals via connecting wires to the converter and from there via an infrared beam to the display of the terminal,means for storing said second electrical signals in areas of the memory reserved for the code of said item,keys being provided at the terminal which when pressed give special signals via the infrared beam and the converter to said control centre, so that upon information (e.g. price of the item, storage location, stock level) relating to the last code read, being stored in the memory is transmitted as additional signals via the infrared beam and the converter to the terminal where it is displayed,and means to send from the control centre repeated information retrieval signals to the terminal upon which it is in the receiving mode for the signals sent by the terminal concerned via the infrared beam concerned for a time of a fraction of a second in each case.

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