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Multiplexer-related

Switching-control-system

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Switching control system

Details

Inventors: Ichiyanagi, Toshikazu;
Assignee: Canon Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Pitts; Harold I.
Assistant Examiner:
Attorney, Agent or Firm: Toren, McGeady & Stanger

The present invention relates to a system in accordance with which switching signal produced in the one piece of equipment is transmitted to another piece of equipment through a digital/analog converter. The transmitted analog signal is further converted into a digital signal by means of an analog/digital converter in the above equipment so as to carry out the switching control of the circuits and so on in the equipment by means of the signal converted into digital form. This is done so that the transmission of the switching signal between a plural number of pieces of equipment comparatively close to each other or under the condition where mixture of noise hardly cannot readily take place might be realized by means of a very small number of wires.

DETAILED DESCRIPTION An object of the present invention is to provide a system in accordance to which the transmission of the switching signals between a plural number of pieces of equipment can be carried out by means of a single transmission line or contact with a simple circuit construction.
Another object of the present invention is to provide a system in accordance with which the transmission of the switching signals between a plural number of the equipments which are, for example, mountable on each other can be carried out by means of a single transmission line or contacts with a small transmission time delay.
A further object of the present invention is to provide a system in accordance with which by decreasing the number of the contacts for transmitting the switching signals between a plural number of pieces of equipment, the switching of a plural number of the circuits in the individual equipment can mutually and remarkably easily be controlled by means of the switches in other pieces of equipment or digital signals from other pieces of equipment.
This is done in such a manner that the electrical functions of the plural number of the equipments are mutually and more closely connected.
A still further object of the present invention is to provide an integrated circuit for signal conversion by means of which the number of the transmission wires of the switching signals between a plural number of pieces of equipment are positioned comparatively close to each other.
In order to fulfil the above mentioned objects in accordance with the present invention, when a system in accordance with which at least one equipment is provided with a digital signal source consisting, for example, of switch groups, while the other equipment is provided with a plural number of circuits and so on connected in such a manner that the switching of the circuits is controlled by means of the digital signal source, the former equipment is provided with a digital/analog converter, while the latter equipment is provided with an analog/digital converter

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