In-line coupling circuit for a closed-loop communication terminal
AssigneeTokyo Electric Co., Ltd.
InventorShohei Unno
Life of this patent
Estimating the term…
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.
Claims10
An in-line coupling circuit for coupling a closed-looped communication terminal to a communication line, comprising:
- coupling means inserted in said communication line, for electrically coupling said closed-loop communication terminal to said communication line, and including means for transferring to said closed-loop communication terminal a reception signal supplied from an upstream portion of said communication line, and means for transferring to a downstream portion of said communication line a transmission signal generated by said closed-loop communication terminal in response to said reception signal;
- monitoring means, coupled to receive said reception signal and said transmission signal, for monitoring specified character data included in each of said reception and transmission signals for indicating the end of a data frame, and for generating an abnormal detection signal when said monitoring means detects that said communication terminal has not responded to said reception signal within a predetermined period of time;
- and
- reporting means for generating a defective code inherent to said closed-loop communication terminal in response to said abnormal detection signal from said monitoring means, and for transferring said generated defective code to the downstream portion of said communication line.
A closed-loop communication system comprising:
- a communication line;
- a plurality of in-line coupling circuits;
- a plurality of communication terminals electrically coupled to said communication line via respective in-line coupling circuits to form a closed loop;
- and
- a communication control apparatus connected to said communication line, for performing communication control processing operations for giving opportunities to said communication terminals in said closed loop to transmit data;
- and
- wherein each of said in-line coupling circuits includes:
- coupling means inserted in said communication line, for electrically coupling said closed-loop communication terminal to said communication line, and including means for transferring to said closed-loop communication terminal reception signal supplied from an upstream portion of said communication line, and means for transferring to a downstream portion of said communication line a transmission signal generating by said communication terminal in response to said reception signal,
- monitoring means, coupled to receive said reception signal and said transmission signal, for monitoring specified character data included in each of said reception and transmission signals and for indicating the end of a data frame, and for generating an abnormal detection signal when said monitoring means detects that said communication terminal has not responded to said reception signal within a predetermined period of time, and
- reporting means for generating a defective code inherent to said communicating terminal in response to said abnormal detection signal from said monitoring means, and for transferring said generated defective code to the downstream portion of said communication line.
Dependencies are inferred from the claim text.