Data processing protocol system

Details Data processing protocol system Data processing protocol system

1978-06-28

1980-10-07

Robinson, Thomas A.

Telegraphy

Systems

Alternating or pulsating current

340347DD, 375 28, H03K 1324

Patent

active

042270456

ABSTRACT:
A transceiver circuit for connecting a data processing unit to a communication bus, wherein said data processing unit is capable of transmitting, receiving and processing non-return to zero (NRZ) signals having a normally high level and assuming a low level to indicate a data bit and said communication bus is capable of transmitting a pulse-no pulse signal to indicate data bits, is disclosed having an input connected to the data processing unit for receiving the non-return to zero signals, a triggering circuit which is responsive to a leading edge of a non-return to zero signal to supply triggering pulses having a predetermined frequency, a gating circuit for passing through the triggering pulses as long as the non-return to zero signal is at a predetermined level, and a pulse-no pulse circuit responsive to the triggering pulses for supplying the pulse-no pulse signals to the communication bus. In addition, the receive portion of the transceiver circuit is responsive to the pulse-no pulse signals to convert them into non-return to zero signals.

REFERENCES:
patent: 3691553 (1972-09-01), McIntosh
patent: 3705398 (1972-12-01), Kostenbauer et al.
patent: 3744051 (1973-07-01), Sanders et al.

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