Telegraphy – Systems – Automatic
Patent
1976-12-06
1977-10-18
Robinson, Thomas A.
Telegraphy
Systems
Automatic
358267, H04L 700, H04N 132
Patent
active
040547450
ABSTRACT:
A control device is described for linking a motor operated data terminal to a data processor which provides information signals including data characters and data terminal motor-start signals. The motor associated with the data terminal is selectively operable between an on condition and an off condition and is programmed to switch from the on condition to the off condition after a first predetermined interval following the last reception of data characters from the data processor. The data terminal motor switches to the on condition upon receipt of a data terminal motor-start signal and reaches its normal operating speed in at least a second predetermined interval after the receipt of a data terminal motor-start signal. The control device includes means for receiving the information signals from the data processor and for transmitting such signals to the data terminal. A first circuit of the control device is responsive to received information signals from the data processor for providing a motor-on status signal to the data processor and is responsive to the absence of information signals for the first predetermined interval for providing to the data processor a motor-off signal. A second circuit of the control device senses the receipt of a motor-start signal from the data processor for providing the data processor with a data terminal busy condition signal of a second predetermined interval. Following the expiration of the second predetermined interval, a terminal non-busy signal is provided to indicate to the data processor that data characters may be sent. Accordingly, upon interruption of transmission of data characters by the data processor for an interval of time equal to the first predetermined interval, the data processor is provided by the control device with a motor-off signal to indicate that a motor-start signal must be sent prior to further transmission of data characters. Upon transmission of a motor-start signal, the data processor is provided with a motor-on signal and a terminal busy condition signal. The terminal busy condition signal further inhibits transmission of data characters for the second predetermined interval until a terminal non-busy condition signal is provided.
REFERENCES:
patent: 2640874 (1953-06-01), McConnell et al.
patent: 2759043 (1956-08-01), Long
patent: 2944104 (1960-07-01), Neagle, Jr.
patent: 3264406 (1966-08-01), Cohen et al.
patent: 3582798 (1971-06-01), Veale
Black Robert J.
GTE Automatic Electric (Canada) Limited
Robinson Thomas A.
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