In-line coupling circuit for a closed-loop communication termina

Details In-line coupling circuit for a closed-loop communication termina In-line coupling circuit for a closed-loop communication termina

1987-12-30

1990-03-06

Fleming, Michael R.

Excavating

371 206, G06F 1110

Patent

active

049072277

ABSTRACT:
An in-line coupling circuit for a POS terminal, includes a coupling section connected in a communication line and electrically connecting the POS terminal to the communication line. The in-line coupling circuit further includes a regeneration error check circuit for monitoring signals transmitted from and received into the POS terminal and generating an abnormal detection signal when a specified character data included in the received signal and indicating the end of a data frame is not generated from the POS terminal and a reporting circuit for generating a defective code inherent to the POS terminal in response to the abnormal detection signal and transmitting the defective code through the communication line.

REFERENCES:
patent: 3449717 (1969-06-01), Smith
patent: 4186380 (1980-01-01), Edwin
patent: 4498082 (1985-02-01), Alridge
patent: 4538264 (1985-08-01), Bahr
patent: 4605921 (1986-08-01), Riddle
patent: 4633468 (1986-12-01), Skatrud
patent: 4692760 (1987-09-01), Unno et al.

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