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Modem with improved handshaking capability

  • US 4,782,498 A
  • Filed: 08/28/1986
  • Issued: 11/01/1988
  • Est. Priority Date: 08/28/1986
  • Status: Expired due to Term
First Claim
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1. In a method of operating a first data communications device to establish communication between said first data communications device and a second data communications device, which includes the step of said first and second data communications devices establishing data communications in a first predetermined communications mode, a method of testing said second data communications device for an ability to communicate in a second predetermined data communications mode, comprising the steps of:

  • (a) causing said first data communications device to transmit a first predetermined set of one or more data words in said first predetermined data communications mode, said data words in said first predetermined set each corresponding to nonprinting characters;

    (b) causing said first data communications device to respond to subsequent receipt of a second predetermined set of data words by switching to operation in said second predetermined data communications mode; and

    (c) alternatively causing said first data communications device to remain in said first predetermined data communications mode in response to subsequent receipt of one or more data words which are not part of said second predetermined set of data words.

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