JPS62217734A - Power line carrier communication equipment - Google Patents

Abstract

PURPOSE:To improve the reliability by providing a sending terminal equipment sending repetitively the same text at the sending to plural reception terminal equipments so as to receive the text surely by plural reception terminal equipments. CONSTITUTION:The titled equipment system consists of a sending terminal equipment incorporating a power line carrier receiver 5 using a high frequency current superimposed on power of a lighting line 4 for communication and of reception terminal equipments 2, 3 receiving a command from the terminal equipment 1, and they have a function controlling and supervising home appliances in a home. In sending a signal from the terminal equipment 1, the signal is sent repetitively for plural number of times set to expect the case that communication from other than power line carrier is received in the reception terminal. Thus, the reception terminal equipment receives the sent text without mis-reception. Thus, even during infrared-ray communication in the terminal equipment 3, the text is received surely. In the communication with a specific reception terminal equipment 2', a text including the opposite address is sent and the communication is attained by confirming the reply of ACK. Although the terminal equipment 2 receives the same text repetitively, no problem takes place because the same control is applied.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a transmission line carrier communication device, and is particularly applicable to a home control system for home use, and is suitable for communication for controlling and monitoring multiple home appliances. The present invention relates to a transmission line carrier communication device.

[Conventional technology]

Conventional communication devices transmit a message that includes the address of the communication partner, and end the communication by receiving a reply called ACK from the other party, but if this reply is not specified, a retransmission message is sent. There is.

[Problem that the invention seeks to solve]

In the above-mentioned conventional technology, it is usually impossible for the sending side to recognize all the recipient addresses for unspecified plural receiving terminals, and it is usually impossible for the sending side to confirm that all the recipients have received the information. Retransmission cannot ensure sufficient reliability.

In particular, with a partner having a communication means other than power line carrier communication, communication may not always be intercepted, so there is a possibility that reception may be missed.

An object of the present invention is to improve the reliability of communication for multiple receiving terminals.

[Means for solving problems]

The above object is achieved by reducing the number of transmitting terminals that repeatedly transmit the same message when transmitting to a plurality of receiving terminals.

[Effect]

When transmitting to multiple receiving terminals, the transmitting/receiving terminal performs multiple transmissions to the receiving terminals, which are set in anticipation of the case where communication is being received from a source other than the power line carrier.This allows the receiving terminal to: Since the message sent from the sending terminal can be received, there is no missed reception.

A reply called ACK is also unnecessary.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

It consists of a transmitting terminal 1 with a built-in power line carrier receiver 5 that communicates using a high-frequency current superimposed on a power line 4, and receiving terminals 2 and 3 that receive future commands.
It has the ability to control and monitor home appliances.

Therefore, the receiving terminal 3 also includes an infrared receiver 7 for receiving signals from an infrared transmitter 6, for example, in order to perform communication other than power line transmission.

Here, when the transmitting terminal 1 communicates with a specific receiving terminal, that is, with a specific party, a message including the address of the party is transmitted, as described in the conventional example.

Communication is accomplished by confirming a reply called ACK.

Here, if the infrared receiver 7 of the receiving terminal 3 receives the transmission from the transmitting terminal 1 while receiving the signal from the infrared transmitter 6, as shown in FIG. Since the signal transmitted from the ACK signal is not input to the reply section, the ACK signal is not returned. Furthermore, Fig. 3 shows the receiving terminal 2.
2 is a block diagram in which ' is omitted. Therefore, in the receiving terminal 3, even if infrared communication is in progress when transmitting from the transmitting terminal 1, the transmitting terminal 1 repeats transmission using the retransmission function until the ACK signal is confirmed, so that communication can be reliably performed.

However, when communicating not with a specific receiving terminal but with all or multiple receiving terminals in a specific group, if there is a reply called ACK from even one of them, the receiving terminal including other communication means If there is a failure in reception, the communication will be terminated even if there is a missed reception, and it is not reliable. Therefore, at least it is possible to receive at least one complete message even if other communication means are used. By repeatedly transmitting telegrams, highly reliable communication is achieved.

That is, in FIG. 2, the communication time of the power line carrier communication telegram is T, which includes a bus monitor that confirms that there is no transmission from other transmitters and that the path line is empty, and a bus monitor that indicates the start of the telegram. It consists of a start bit S and a telegram message. On the other hand, in infrared communication, if the time required for message DI is TI, then in order to reliably transmit from sending terminal 1 to multiple receiving terminals including receiving terminal 3, add 3 to the integer value of the quotient divided by TIf&T. By repeating the transmission a number of times, it is possible to transmit at least one complete telegram to the receiving terminal 3. At this time, the receiving terminal 2 will receive the same message continuously, but even if it operates in this way, it will perform the same control and there will be no problem. These operations are as shown in FIG.

〔Effect of the invention〕

According to the present invention, it is possible to configure a system including receiving terminals having communication means other than power line carrier communication. It is also possible to connect it with advanced communication methods such as , and remote control methods using telephone lines.

In addition, for repeated messages, the bus monitor and
Since it has a start bit, the beginning of the message can be easily detected at the end of communication other than power line transport or when power line transport is received, and the protocol can be simplified.

[Brief explanation of drawings]

Fig. 1 is a system configuration diagram of the embodiment, Fig. 2 is a diagram showing the message format, Fig. 3 is a block diagram for explaining the operation of the embodiment of the present invention, and Fig. 4 is a flow chart of the embodiment software. be. 1... Sending terminal, 2, 2'... Receiving terminal, 3...
Receiving terminal, 4... Power line, 5... Power line carrier transceiver, 6... Infrared transmitter, 7... Infrared receiver. 'DI of ¥-1:,! :Outside 1 Electric Disaster Ding:i! 11J, Senmae T1 :;lr4Ui4da

Claims (1)

[Claims] 1. In a power line carrier communication device consisting of a transmitting terminal and a plurality of receiving terminals that receive transmission signals from the transmitting terminal, at least one of the plurality of receiving terminals has a receiver that performs reception other than power line transmission. A power line carrier communication device characterized in that the transmission signal is repeatedly transmitted a plurality of times.