Programmable interface between remote terminals and a computer
Patent 4481574 Issued on November 6, 1984. Estimated Expiration Date: 
February 18, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 18, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3507997 3516062 3675513 3746793 3746794 3760171 3870821 3896267 Keyboard operated terminal apparatus Telephone communications system for the deaf InventorsAssigneeApplicationNo. 06/350131 filed on 02/18/1982US Classes:379/93.01, Having transmission of a digital message signal over a telephone line379/102.02, Communication device710/11, Protocol selection710/8Peripheral configurationExaminersPrimary: Zache, Raulfe B.Attorney, Agent or FirmInternational ClassesG06F 13/38 (20060101)H04M 11/06 (20060101) AbstractA data receiver providing an intelligent interface for a hand held computerized data entry terminal to communicate over telephone lines with a host computer. The data receiver has multiple microprocessor control receiver line cards connected to telephone lines and interconnected to interface with the host computer. Each line card includes a system program in a nonvolatile area of memory and a customer application program in volatile area of memory. The data receiver answers the telephone, checks for errors and provides progress tones over the telephone line. When connected to a data entry terminal, the data receiver sets the baud rate, determines the line card protocol, reformats the data in accordance with the customer specifications and hands the data off to the host computer. A remote service computer may be connected to each line card to update the customer application program in the data receiver as well as perform diagnostic and testing routines over the telephone line.Other References
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