Data terminal with error checking file transfer mode

Details Data terminal with error checking file transfer mode Data terminal with error checking file transfer mode

1981-05-18

1984-09-04

Gruber, Felix D.

Boots, shoes, and leggings

3645135, G06F 900

Patent

active

044701276

ABSTRACT:
A data terminal having an error checking file transfer mode which tests received data to determine whether it is valid data and transmits an acknowledge or nonacknowledge signal dependent upon the results of the valid data test. This valid data test preferably takes the form of some type of logical redundancy check matching received data signal with a received redundancy signal. Valid received data is stored in an internal random access memory or an external mass memory. The data terminal preferably exchanges hand shaking signals prior to the initiation of data transfer. The data terminal preferably generates a nonacknowledge signal when a predetermined time has elapsed since the last received signal, echoes an end of file signal when an end of file signal is received and transmits a reset signal if the communications are garbled. In the preferred embodiment the data terminal includes a simple processing unit operating under the control of a program stored in a plug-in read only memory.

REFERENCES:
Heathkit Manual for the Video Terminal Model H-19 Copyright 1979, Heath Company, Burton Harbor, Michigan.
Black Box Catalogue-Error Controller for Asynchronous Terminals, p. 11.
"An Answer/Originate Modem", Parson, Jun. 1980, Byte Magazine.
"Computer Dictionary and Handbook", Sippl, 1966, Howard Sams & Co., Inc.

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