Cermetek Microelectronics, Inc.

Stephen J Durham

A device having a universal receiver transmitter, a modem, and a mode selector switch. The mode selector switch is used to switch the serial data side of the universal receiver transmitter between the modem and the host terminal whereby the universal modem receiver transmitter can be substituted into a host terminal where a universal receiver transmitter had been located, and the universal modem receiver transmitter can perform the function of the universal receiver transmitter or can perform as a universal receiver transmitter and modem, facilitating data format conversion between formats appropriate to the host terminals parallel data bus and a format appropriate for telephone line data transmission.

Universal modem receiver transmitter

A remote-telemetry unit for monitoring and reporting to a remote location over a telephone line the condition of an associated piece of equipment at predetermined times, when polled and when the equipment condition dictates, the unit including a direct access arrangement, a switched-frequency Friend Biquad type filter and a detector, the combination for detecting tone signals developed on the line, and a digital-to-analog converter and a controller, in combination with the direct access arrangement for developing on the line tone signals for dialing and for condition reporting.

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Cupertino, CA, United States of America

Stephen J Durham