Matsushita Electric Works, Ltd.

Yoshiharu Suzuki

Yoshiyuki Komoda

Hitoshi Fukagawa

Takashi Saeki

Motoharu Terada

Osamu Akiba

Osamu Tanaka

In a time-division multiplex transmission system, a host machine (3) and a plurality of addressable terminals (51 to 56) are connected together by way of a signal line (6). The same address (A) is assigned to a group of the terminals (51 to 54) so that the group of terminals (51 to 54) may be placed under control at the same time upon receipt of a transmission signal (SS) from the host machine (3). Reply signals (RS1 to RS4) from the respective terminals (51 to 54) are adjusted so that they are sent back at different points in time. This enables the host machine (3) to determine which of the terminals sent back the reply signal (RS1 to RS4).

Time-division multiplex transmission system

A data transmission system utilizing a power line comprises a transmitter (1), a receiver (2) and a repeater (5) coupled to a power line (3). Control data including a start code in the form of a high frequency signal is transmitted from the transmitter (1) in superposition on an alternating current of the commercial power supply using the power line. The repeater receives the control data transmitted from the transmitter, thereby to store the control data in a memory responsive to the start code. The control data is then read from the memory after the lapse of a predetermined period of time and is retransmitted to the receiver in a predetermined level. The receiver receives the control data, thereby to control an apparatus being controlled such as a relay, whereupon the same transmits in a return manner the data representing a control state thereof. The repeater receives the data and transmits the same to the transmitter.

Data transmission system utilizing power line

A time division multiplex remote control system controls data transmission between a central controller and a plurality of addressable remote terminals coupled to the central controller through a signal line. The central controller transmits to each of terminals a transmission signal comprising address data addressing a terminal, control data, a reply signal standing-by period defining signal for defining a period for receiving a reply signal from the corresponding terminal, an interruption request signal standing-by period defining signal for defining a period for receiving an interruption request signal from the terminal. Each terminal receives the transmission signal and, when the received address data coincides with an address of the terminal, accepts the control data and sends a reply signal during a reply signal standing-by period. Each terminal further detects a change of a supervisory input which the terminal supervises and sends an interruption request signal at the timing of the interruption request signal standing-by period of the transmission signal.

Interruption handling system in time division multiplex remote control

A data transmission system utilizing a power line comprises a transmitter (1), a receiver (2) and a repeater (5) coupled to a power line (3). Control data including a start code in the form of a high frequency signal is transmitted from the transmitter (1) in superposition on an alternating current of the commerical power supply using the power line. The repeater receives the control data transmitted from the transmitter, thereby to store the control data in a memory responsive to the start code. The control data is then read from the memory after the lapse of a predetermined period of time and is retransmitted to the receiver in a predetermined level. The receiver receives the control data, thereby to control an apparatus being controlled such as a relay, whereupon the same transmits in a return manner the data representing a control state thereof. The repeater receives the data and transmits the same to the transmitter.

A transmitter connected to any phase of a 3-phase alternating current transmits a data subsequent to a lock signal in synchronism with the cycles of the phase. A receiver connected to any phase of the 3-phase alternating current receives a lock signal in synchronism with the cycles of the phase. The receiver receives each data after the receiver is synchronized with the transmitter using the lock signal. The synchronized relation is maintained, that is locked until each data transmission subsequent to a lock signal is terminated. The lock is released upon detection of an end signal added to the last portion of each data or a non-busy signal interval. In the case wherein a data transmission is repeated a plurality of times, a set of signals including a lock signal and a data is repeatedly sent out, interleaved with a non-busy signal interval.

Data transmission system utilizing power line of 3-phase alternating

A data transmission system utilizing a power line transmits a data signal of a plurality of bits in a serial fashion in synchronism with the cycles of the alternating current of a power supply. A start signal, channel section signal, control data signal and end signal are sequentially generated to transmit the control data to a selected receiver to control a desired output. Each cycle is divided into at least two phase sections, the one being used for a busy signal and the other being used for a data signal. The data transmission system includes a plurality of transmitters and a plurality of receivers coupled to the power line. Each of the transmitters comprises a receiving circuit for receiving a busy signal from other transmitters, a transmitting circuit for transmitting a data signal, a key input switch for operation, a selecting switch for selecting a channel which receives the transmitted data signal, and a memory for storing the key input signal. The transmitting circuit generates a data signal in response to the key input signal stored in the memory and to a non-busy signal. One embodiment of the transmission system of the present disclosure enables information to be transmitted over multiple-phase power lines.

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Kadoma, Japan

Yoshiharu Suzuki