Dialing system for teleprinter

Details Dialing system for teleprinter Dialing system for teleprinter

1980-05-14

1982-05-11

Robinson, Thomas A.

Telegraphy

Systems

Automatic

178 2R, 178 17C, 179 90K, H04M 142, H04L 1500

Patent

active

043295410

ABSTRACT:
A dialing system which utilizes a keypad on teleprinters retrofitted into existing teleprinter models through interfacing by voltage biasing and output circuitry with integrated circuit components having inputs to the teleprinter keypad and a pulse driver coupled to the existing dialing circuit through relays. The relays, driver and integrated circuit components are energized under different voltage levels lower than the teleprinter operating voltage through the voltage biasing circuits connected to the teleprinter power supply.

REFERENCES:
patent: 3733440 (1973-05-01), Sipes
patent: 3856982 (1974-12-01), Lawson et al.
patent: 3885108 (1975-05-01), Zock
patent: 3956596 (1976-05-01), Connolly et al.
patent: 4000363 (1976-12-01), Widmaier
patent: 4008380 (1977-02-01), La Borde
patent: 4012601 (1977-03-01), Kehren
patent: 4119810 (1978-10-01), Marin et al.
patent: 4143243 (1979-03-01), Sutton
patent: 4232200 (1980-11-01), Hestad et al.

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