method and device for telex data of public service for the participants

摘要

Teleprinting system, at a telephone user comprising an apparatus formed by a microprocessing unit (12) connected to a telephone line (16) through a modulating-demodulating or modem system (14). Data transmission messages are distinguished from standard telephone messages for example by means of differences in the ring signal. The received data are sent to a printer, (22) to a display (38) or, through an interface circuit (30) to an outer computer, and by which messages are received from an optical reader (34) or from a keyboard (42) for their transmission through the modem unit (14) to the corresponding apparatus of an agency or individual connected in order to embody said interaction. Said teleprinting system is particularly suitable to embody telebilling or teleinvoicing methods from service agencies to an end user.