Importance

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Abstract

Transmission system for digital control of electrical devices, by means of standardized or uniformly releasable pulse combinations corresponding to the desired control operations, which pulse combinations are sent selectively at least from a first and a second of the devices to be controlled to a two-conductor line system, which line system connects all devices in parallel with each other, whereby the connection line is under a constant bias voltage. The bias voltage, depending upon which of the two devices emits signals, is switched or changed over to a low bias voltage, the level of the low bias voltage being selected such that the signals to be transmitted from the first device, which signals are sent, by means of corresponding conversion circuits as voltage intrusions of a certain depth, to the connection line, do not become operative or effective, because the latter signals (the voltage intrustions) are not deeper than the drop to the lower of the two bias voltages, whereby the first device receives the control pulses from a hand-operable control device and the second device receives from a microprocessor which is located in the second device, the signal output of the microprocessor being predetermined to a certain action by adjustment of adjustment means.

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First Claim