Method and equipment for bidirectional data transmission (protoc

Details Method and equipment for bidirectional data transmission (protoc Method and equipment for bidirectional data transmission (protoc

1994-01-24

1996-05-07

Horabik, Michael

Communications: electrical

Continuously variable indicating

With meter reading

370 853, 359136, H04J 1408

Patent

active

055150357

ABSTRACT:
With this method, a CSMA/CA protocol can be used for the transmission of data by means of infra-red light or radio (or other non-hard-wired transmission media). For this purpose a communicator that has a transmit requirement and has not yet received a bit identifies itself as an initiating communicator, and one that has no transmit requirement but has received a bit identifies itself as a receiving communicator. At the start of data transmission the initiating communicator sends a double length start bit (D) representing its identity and then waits a defined time (tc), during which the receiving communicator sends back an echo in the form of a single length start bit (B). The initiating communicator waits after each bit transmitted for the echo and compares this on receipt with the transmitted bit, its transmission being interrupted after a mismatch. After the data transmission, and provided there is no further transmit requirement, the identities of initiating and receiving communicators are removed.

REFERENCES:
patent: 5121382 (1992-06-01), Yang et al.
patent: 5164942 (1992-11-01), Kamerman et al.
patent: 5276703 (1994-01-01), Budin et al.
patent: 5295154 (1994-03-01), Meier et al.
patent: 5311114 (1994-05-01), Sambamurthy et al.

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