JP3430689B2 - Bidirectional repeater device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bidirectional repeater device provided on a transmission line, and more particularly to a response measure for data transfer.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 12, in a data communication system (10), a bipolar AMI code is used as a data code, and various communications are performed by using an AMI signal. There is something.

This data communication system (10) is constructed by connecting a first network (1A) and a second network (1B) through a bidirectional repeater device (20), and the first network (1A). And the second network (1B)
The terminals (12, 12, ...) Are connected to the communication path (11). Then, the terminals (12, 12, ...) Of the first network (1A) and the terminals (12, 12,) of the second network (1B).
12, ...) and data signals are bidirectionally communicated.

The bidirectional repeater device (20) waveform-processes the pulse amplitude of the AMI signal transmitted and received between the first network (1A) and the second network (1B) to a predetermined amplitude, that is, When the number of connected terminals (12, 12, ...) Increases and the communication path (11) becomes long distance, the pulse amplitude of the AMI signal is attenuated. Therefore, this pulse amplitude is restored to a predetermined amplitude, The waveform is shaped so that the AMI signal holds a predetermined amplitude.

The bidirectional repeater device (20) is provided with two repeat circuits having a receiving circuit and a transmitting circuit, as disclosed in Japanese Patent Laid-Open No. 1-93229, and each of the repeat circuits is provided. Some circuits include a comparator and a gate circuit, and are configured to transmit the AMI signal received from one terminal to the other terminal.

[0006]

In the above-described bidirectional repeater device (20), CSMA / CD is used for data transmission.
When the (carrier detection multiple access / collision detection) method is adopted, high speed response is required.

In other words, from the first network (1A) to the second
The transmission time of the data sent to the network (1B) is
Transmission time t (1) of the communication path (11) of the first network (1A)
And the signal processing time t (2) of the bidirectional repeater device (20),
Transmission time t (3) of the communication path (11) of the second network (1B)
Similarly, the transmission time of data transmitted from the second network (1B) to the first network (1A) is
The transmission time t (4) of the communication path (11) of the network (1B),
The signal processing time t (5) of the bidirectional repeater device (20) and the first
The transmission time t (6) of the communication path (11) of the network (1A) is required.

On the other hand, in order for the above CSMA / CD to be performed normally, it is necessary to receive a pulse from another terminal (12) during the allowable delay time td from the beginning of the pulse to the sampling point. .

Specifically, as shown in FIG. 13, for example,
The first terminal (12) of the first network (1A) outputs the start bit ST to synchronize the output of the second terminal (12) of the second network (1B). At this time, since the transmission time t (1) + t (2) + t (3) is required as described above, the start bit ST of the second terminal (12) is transmitted with a slight delay. After that, when the second terminal (12) transmits a negative pulse, the transmission time t (4) + t (5) + t (6) is required as described above, so that the first terminal (12) is slightly This negative pulse will be received after a delay.

Therefore, the total response time t (1) + ... + t (6) + α obtained by adding the minute time α in addition to the transmission time t (1) + ... + t (6) must be smaller than the permissible delay time td. I have to.

However, in the transmission time, the communication path (1
Since the transmission time t (1), t (3), t (4), t (6) of 1) occupies almost all, the signal processing time t (2) of the bidirectional repeater device (20) , T (5) must be made extremely short, and high-speed response of the bidirectional repeater device (20) is required.

Therefore, as the semiconductor elements such as the transmission circuit, the reception circuit and the control circuit of the bidirectional repeater device (20), high-performance elements having higher responsiveness than the applied semiconductor elements of the terminal (12) are used. There is a problem that it becomes expensive.

The present invention has been made in view of the above circumstances, and an object thereof is to ensure reliable transmission without using a high-performance semiconductor element.

[0014]

In order to achieve the above object, the means taken by the present invention is to store one packet of data transmitted from two networks.

Specifically, as shown in FIG. 1, the means taken by the invention according to claim 1 is as follows. First, a first network (1A) and a second network (1B) each of which a terminal (12) is connected. ) Is intended for a bidirectional repeater device that bidirectionally transmits a data signal to and from.

Then, a first transmitting / receiving unit (30) for transmitting / receiving a data signal to / from the first network (1A) and a second transmitting / receiving unit (40) for transmitting / receiving a data signal to / from the second network (1B). ) And a signal control unit (50) for transmitting and receiving a data signal between the first transmission / reception unit (30) and the second transmission / reception unit (40).

The signal control section (50) is provided with a first memory (61) and a second memory (62) for storing data. Further, the signal control unit (50) stores one packet of data in the first memory (61) based on the data signal received by the first transmission / reception unit (30) from the first network (1A).
Writing means (6) for writing one packet of data in the second memory (62) based on the data signal received from the second network (1B) by the second transmitting / receiving unit (40).
3) is provided. In addition, the signal control unit (50)
Indicates that the communication path (11) of the second network (1B) is available.
Reading data of one packet stored in the first memory (61) in the state, the second transceiver unit (40) said second transceiver to transmit is de data signal to the second network (1B) (40)
While outputting the data signal to the first network (1A)
To send one data packet stored in the second memory in the released state (62) of the channel (11) reading, the first transmitting and receiving unit (30) is de data signal to the first network (1A) Further, a reading means (64) for outputting a data signal to the first transmitting / receiving section (30) is provided.

In the invention of claim 1, the means taken by the invention of claim 2 is such that the data signal is an AMI signal, and the means taken by the invention of claim 3 is that the terminal (12) is It is configured as an air conditioning unit.

[0019]

With the above construction, in the invention according to claim 1,
For example, when the first terminal (12) of the first network (1A) transmits a data signal, particularly in the inventions according to claims 2 and 3, when the air conditioning unit outputs the data signal of the AMI signal, the data signal is transmitted. The first transmitting / receiving unit (30) receives the signal. The data signal received by the first transmission / reception unit (30) is input to the signal control unit (50), and the writing unit (63) in the signal control unit (50) writes one packet of data based on the data signal. Is written in the first memory (61), and the data of the one packet is stored in the first memory (61).

On the other hand, when the terminal (12) of the first network (1A) is transmitting a data signal,
When the terminal (12) of the second network (1B) transmits the data signal, the second transceiver unit (40) transmits the data signal of the second network (1B) in the same manner as the data signal of the first network (1A). To receive. Then, the second transceiver (4
The data signal received by (0) is input to the signal control unit (50), and in the signal control unit (50), the writing means (63) stores one packet of data in the second memory (62) based on the data signal. The data of one packet is written and stored in the second memory (62).

After that, when the communication path (11) of the second network (1B) becomes free, the reading means (64) stores the data stored in the first memory (61), that is, the first network (1A). The data transmitted from is read and a data signal is output. This data signal is output to the communication path (11) of the second network (1B) via the second transmitting / receiving unit (40), and the terminal (12) of the second network (1B) receives the data signal. .

On the other hand, the data stored in the second memory (62) is also transmitted in the same manner, and when the communication path (11) of the first network (1A) becomes idle, the reading means (64) causes the second network (64) to operate. The second data B1 transmitted from (1B)
It reads from the memory (62) and outputs a data signal. This data signal is output to the communication path (11) of the first network (1A) via the first transmission / reception unit (30), and the terminal (12) of the first network (1A) receives the data signal. . Then, the above-mentioned operation is repeated.

[0023]

Therefore, according to the first and second aspects of the present invention, one packet of data is stored based on the received data signal, and the data signal is output at a predetermined transmission timing. Since high speed response is not so required, a semiconductor element similar to the terminal (12) can be used without using a high performance semiconductor element. As a result, the device itself can be made inexpensive.

Further, since the data having a higher priority among the stored data can be output, the transmission accuracy can be improved.

Further, since unnecessary data can be deleted from the stored data, the traffic on the communication path (11) can be reduced.

According to the third aspect of the invention, the air conditioning control signal can be accurately transmitted between the plurality of terminals (12, 12, ...) As the air conditioning unit, so that the reliability is high. Air conditioning control can be performed.

[0027]

Embodiments of the present invention will now be described in detail with reference to the drawings.

The data communication system (1
0) is similar to the system described in the related art (see FIG. 12) shown in FIG. 2, and will be described using the same reference numerals.

The data communication system (10) is constructed by connecting a first network (1A) and a second network (1B) via a bidirectional repeater device (20). The first network (1A) and the second network (1
B) means that multiple terminals (12, 12, ...), which are air conditioning units such as outdoor units and indoor units, are connected to the communication path (1
1) is connected and configured.

The terminals (12, 12, ...) Of the first network (1A) and the terminals (1) of the second network (1B).
, 12, etc.), the air conditioning control signal which is a data signal is bidirectionally communicated to control the air conditioning operation, and the AMI signal is used as the data signal of the air conditioning control signal.

The bidirectional repeater device (20) waveform-processes the pulse amplitude of the AMI signal transmitted and received between the first network (1A) and the second network (1B) to a predetermined amplitude, that is, When the number of connected terminals (12, 12, ...) Increases and the communication path (11) becomes long distance, the pulse amplitude of the AMI signal is attenuated. Therefore, restore the pulse amplitude to a predetermined amplitude. There is.

The bidirectional repeater device (20) includes a first transmission / reception unit (30), a second transmission / reception unit (40), and a signal control unit (50).
It is configured as a bidirectional type with and.

The first transmission / reception unit (30) and the second transmission / reception unit (40) include a reception circuit (31, 41) for receiving a data signal transmitted from each network (1A, 1B) and each network (1A). , 1B) to output a data signal to the transmission circuit (32,
42) and a polarity determination circuit (33, 43) for determining the polarity of the communication path (11) of each network (1A, 1B).

The signal control section (50) includes an MPU (60) and two transmission control circuits (51, 52). The MPU (60) of the signal control unit (50) includes receiving circuits (31, 31) of the first transmitting / receiving unit (30) and the second transmitting / receiving unit (40).
The transmission control circuit (5
1, 52), and the polarity determination circuit (33, 4)
While receiving the polarity signal of the communication path (11) output by 3), the data signal received from each of the receiving circuits (31, 41) is received by the second transmitting / receiving unit (40) and the first transmitting / receiving unit (30). It is configured to output to the transmission circuit (42, 32).

Further, as a feature of the present invention, the MPU (60) is provided with a first memory (61) and a second memory (62), as well as a writing means (63) and a reading means (64). ing.

The first memory (61) is configured to store the data transmitted from the first network (1A), and the second memory (62) is the data transmitted from the second network (1B). Is configured to store.

As shown in FIG. 3, the writing means (63) includes one packet of data based on the data signal received by the receiving circuit (31) of the first transmitting / receiving section (30) from the first network (1A). A1 is written in the first memory (61), while the receiving circuit (41) of the second transmitting / receiving unit (40) receives one packet of data B1 based on the data signal received from the second network (1B). It is written in the memory (62).

The reading means (64) stores the data of one packet stored in the first memory (61) as shown in FIG.
While reading A1, the transmission circuit (42) of the second transmission / reception unit (40) outputs the data signal to the transmission circuit (42) so as to transmit the data signal to the second network (1B) at a predetermined transmission timing. , 1 stored in the second memory (62)
The data B1 of the packet is read out, and the transmission circuit (3) of the first transmission / reception unit (30) transmits the data signal to the first network (1A) at a predetermined transmission timing.
It outputs a data signal to 2).

For example, between the first network (1A) and the bidirectional repeater device (20), CSMA / C
When data is transmitted by the D method, the reading means (64)
Is configured to read the data B1 in the second memory (62) and output the data signal to the transmission circuit (32) of the first transmission / reception unit (30) while the communication path (11) is empty.

-Data Transmission Operation- Next, the data transmission operation of the bidirectional repeater device (20) in the data communication system (10) will be described.

First, as shown in FIG. 3, for example, when one terminal (12) of the first network (1A) transmits a data signal, the data signal is received by the receiving circuit (31) of the first transmitting / receiving unit (30). ) To receive. The data signal received by the receiving circuit (31) is transmitted to the MPU via the transmission control circuit (51).
(60), and in the MPU (60), the writing means (63) writes one packet of data A1 in the first memory (61) based on the data signal, and the one packet of data A1 is in the first memory. Stored at (61).

On the other hand, when the terminal (12) of the first network (1A) is transmitting a data signal,
When the terminal (12) of the second network (1B) transmits a data signal, the second transceiver (40) receives the data signal of the second network (1B) as well as the data signal of the first network (1A). The circuit (41) receives it. The data signal received by the receiving circuit (41) is transferred to the transmission control circuit (5
2) is input to the MPU (60), and in the MPU (60), the writing means (63) writes one packet of data B1 to the second memory (62) based on the data signal, The data B1 is stored in the second memory (62).

After that, when the communication path (11) of the second network (1B) becomes free, the reading means (64) causes the data A1 stored in the first memory (61), that is, the first network (1A). The data A1 transmitted from is read and a data signal is output. The data signal is input to the transmission circuit (42) of the second transmission / reception unit (40) via the transmission control circuit (52), and the transmission circuit (42) transmits the data signal to the second network (1B). The data signal is output to the communication path (11), and the terminal (12) of the second network (1B) receives the data signal.

On the other hand, the data B1 stored in the second memory (62) is similarly transmitted, and when the communication path (11) of the first network (1A) becomes idle, the reading means (64) makes the Data transmitted from 2 networks (1B)
B1 is read from the second memory (62) and a data signal is output. The data signal is input to the transmission circuit (32) of the first transmission / reception unit (30) via the transmission control circuit (51), and the transmission circuit (32) transmits the data signal to the first network (1A).
To the communication path (11), and the terminal (12) of the first network (1A) receives the data signal. Then, the above-described operation is repeated, and the waveform of the data signal is shaped by the bidirectional repeater device (20).

-Data Flow- Next, a data flow in a specific data communication system (10) will be described with reference to FIGS.

This data communication system (10) includes a third network as well as a first network (1A) and a second network (1B).
It is configured to transfer data to and from the network (1C) and comprises two bidirectional repeater devices, a first repeater device (20-1) and a second repeater device (20-2). , The first repeater device (20-1) is provided between the first network (1A) and the second network (1B), and the second repeater device (20-2) is the second network (1B).
And the third network (1C).

The first network (1A) includes the first terminal (12-A), the second terminal (12-B) and the third terminal (12-C).
And the second network (1B) is connected to the fourth terminal (12-
The third network (1C) has only the fifth terminal (12-E), the sixth terminal (12-F), and the seventh terminal (12-G). Then, a unique terminal number is given to each of the first terminal (12-A) to the seventh terminal (12-G), and the first terminal (12-A) has the number 1 and the second terminal (12 has the number 12). -B) is 2
However, the third terminal (12-C) has 3 and the fourth terminal (12-D) has 4
However, 5th terminal (12-E) is 5, 6th terminal (12-F) is 6
However, 7 is assigned to the seventh terminal (12-G).

Data transmission between the first terminal (12-A) to the seventh terminal (12-G) will be described.

First, the first network (1A) and the second network
Data transmission between the network (1B) and the third network (1C) adopts the CSMA / CD method, and is prioritized when the bit output from the LSB (least significant bit) of the terminal number is "0".

<Timing 1> As shown in FIG. 4, when data transmission is started, in the first network (1A), the first terminal (12-A), the second terminal (12-B) and the third terminal The terminal (12-C) outputs a data signal and the transmission conflicts. In this case, in the first network (1A), the second terminal (12-B) of the terminal number 2 wins the competition, so that the second terminal (12-
The data of B) is received by the first terminal (12-A) and the third terminal (12-C), and at the same time the first terminal of the first repeater device (20-1)
Stored in the memory (61).

At the same time as the data transmission of the first network (1A), the second network (1B) also starts data transmission. At this time, in the second network (1B),
Since only the fourth terminal (12-D) transmits the data of this fourth terminal (12-D), the second memory (62) of the first repeater apparatus (20-1) and the second repeater apparatus (20- It is stored in the first memory (61) of 2).

Further, at the same time as the data transmission of the first network (1A) and the second network (1B), the third network (1C) also starts data transmission, but in the third network (1C), The terminal (12-E), the sixth terminal (12-F), and the seventh terminal (12-G) output data signals and the transmissions compete with each other. In this case, in the third network (1C), the sixth terminal (12-F) of the terminal number 6 wins the competition, so that the data of the sixth terminal (12-F) becomes the fifth terminal (12-E). The data is taken in by the seventh terminal (12-G) and stored in the second memory (62) of the second repeater device (20-2).

<Timing 2> Next, as shown in FIG. 5, in the first network (1A), since the second terminal (12-B) has completed the data transmission, the first terminal (12- A), the third terminal (12-C), and the first repeater device (20-
1) and and output the data signal and the transmission conflicts. In this case, the data of the fourth terminal (12-D) is stored in the second memory (62).
Since the first repeater device (20-1) stored in the store wins the competition, the data of the fourth terminal (12-D) is transferred to the first terminal (12-A).
And the second terminal (12-B) and the third terminal (12-C).

In the second network (1B), since the fourth terminal (12-D) has finished the data transmission, the first repeater device (20-1) and the second repeater device (20)
-2) and the two output data signals and transmission conflicts. In this case, the data of the second terminal (12-B) is stored in the first memory (61).
Since the first repeater device (20-1) stored in the terminal wins the competition, the data of this second terminal (12-B) is transferred to the fourth terminal (12-D).
And the first of the second repeater device (20-2)
Stored in the memory (61).

On the other hand, in the third network (1C), since the sixth terminal (12-F) has finished the data transmission, the fifth terminal (12-E) and the seventh terminal (12-G) are connected. The second repeater device (20-2) outputs a data signal and the transmissions compete with each other. In this case, the second repeater device (20-2) that has stored the data of the fourth terminal (12-D) in the first memory (61) wins the competition, and thus the data of the fourth terminal (12-D). Are taken in by the fifth terminal (12-E), the sixth terminal (12-F) and the seventh terminal (12-G).

<Timing 3> Subsequently, as shown in FIG. 6, in the first network (1A), the second terminal (12-B) finishes the data transmission, and the first repeater device (20
Since no data is stored in the second memory (62) of (-1), the first terminal (12-A) and the third terminal (12-C) output the data signal and the transmissions compete with each other. In this case, since the first terminal (12-A) wins the competition, the data of the first terminal (12-A) is transferred to the second terminal (12-B) and the third terminal (12-C). At the same time, it is stored in the first memory (61) of the first repeater device (20-1).

In the second network (1B), the fourth terminal (12-D) finishes the data transmission, and the data is stored in the first memory (61) of the first repeater device (20-1). Therefore, only the second repeater device (20-2) outputs the data signal. Then, the second repeater device (20
-2) the 6th terminal (12-
F) data is taken into the 4th terminal (12-D),
It is stored in the second memory (62) of the first repeater device (20-1).

On the other hand, in the third network (1C), since the sixth terminal (12-F) has finished data transmission, the fifth terminal (12-E) and the seventh terminal (12-G) are connected. The second repeater device (20-2) outputs a data signal and the transmissions compete with each other. In this case, the second repeater device (20-2) that has stored the data of the second terminal (12-B) in the first memory (61) wins the competition, and thus the data of the second terminal (12-B). Are taken in by the fifth terminal (12-E), the sixth terminal (12-F) and the seventh terminal (12-G).

<Timing 4> Next, as shown in FIG. 7, in the first network (1A), the second terminal (12-B) and the first terminal (12-A) finish data transmission. Therefore, the third terminal (12-C) and the first repeater device (20-
1) and and output the data signal and the transmission conflicts. In this case, the data of the sixth terminal (12-F) is stored in the second memory (62).
Since the first repeater device (20-1) stored in the store wins the competition, the data of this sixth terminal (12-F) is transferred to the first terminal (12-A).
And the second terminal (12-B) and the third terminal (12-C).

In the second network (1B), the fourth terminal (12-D) finishes the data transmission, and the data is stored in the second memory (62) of the second repeater device (20-2). Therefore, only the first repeater device (20-1) outputs the data signal. Then, the first repeater device (20
-1) first terminal (12-) stored in the first memory (61)
The data of A) is taken into the 4th terminal (12-D),
It is stored in the first memory (61) of the second repeater device (20-2).

On the other hand, in the third network (1C), the sixth terminal (12-F) finishes the data transmission and the data is stored in the first memory (61) of the second repeater device (20-2). No.5 terminal (12-E) and 7th terminal (12-G)
And output a data signal, and transmission conflicts. in this case,
Since the fifth terminal (12-E) wins the competition, the data of this fifth terminal (12-E) is transferred to the sixth terminal (12-F) and the seventh terminal (12-E).
G) and the second repeater device (20-2)
Stored in the second memory (62).

<Timing 5> Next, as shown in FIG. 8, in the first network (1A), the second terminal (12-B) and the first terminal (12-A) finish data transmission,
Since no data is stored in the second memory (62) of the first repeater device (20-1), the third terminal (12-C) outputs a data signal. Then, the data of the third terminal (12-C) is taken in by the first terminal (12-A) and the second terminal (12-B), and the data of the first repeater device (20-1) Stored in the memory (61).

In the second network (1B), the fourth terminal (12-D) ends the data transmission, and the data is stored in the first memory (61) of the first repeater device (20-1). Therefore, only the second repeater device (20-2) outputs the data signal. Then, the second repeater device (20
-2) the fifth terminal (12- stored in the second memory (62)
The data of E) is taken into the 4th terminal (12-D),
It is stored in the second memory (62) of the first repeater device (20-1).

On the other hand, in the third network (1C), since the sixth terminal (12-F) and the fifth terminal (12-E) have finished data transmission, they are called the seventh terminal (12-G). The second repeater device (20-2) outputs a data signal and the transmissions compete with each other. In this case, the second repeater device (20-2) that has stored the data of the first terminal (12-A) in the first memory (61) wins the competition, and thus the data of the first terminal (12-A). Are taken in by the fifth terminal (12-E), the sixth terminal (12-F) and the seventh terminal (12-G).

<Timing 6> Next, as shown in FIG. 9, in the first network (1A), the second terminal (12-B), the first terminal (12-A) and the third terminal (12-). C) has completed data transmission, the first repeater device (20-
Only 1) outputs the data signal. The data of the fifth terminal (12-E) stored in the second memory (62) of the first repeater device (20-1) is transferred to the first terminal (12-A) and the second terminal (12-B). ) And the third terminal (12-C).

In the second network (1B), the fourth terminal (12-D) finishes the data transmission and the data is stored in the second memory (62) of the second repeater device (20-2). Therefore, only the first repeater device (20-1) outputs the data signal. Then, the first repeater device (20
-1) the third terminal (12- stored in the first memory (61)
The data of C) is taken into the 4th terminal (12-D),
It is stored in the first memory (61) of the second repeater device (20-2).

On the other hand, in the third network (1C), the sixth terminal (12-F) and the fifth terminal (12-E) finish data transmission, and the first terminal of the second repeater device (20-2) Since no data is stored in the memory (61), only the seventh terminal (12-G) outputs a data signal. And the seventh
The data of the terminal (12-G) is taken into the fifth terminal (12-E) and the sixth terminal (12-F), and the second repeater device (20-
It is stored in the second memory (62) of 2).

<Timing 7> Next, as shown in FIG. 10, in the first network (1A), the second terminal (12-B), the first terminal (12-A) and the third terminal (12-). Since C) finishes the data transmission and the data is not stored in the second memory (62) of the first repeater device (20-1), the data transmission is not performed.

In the second network (1B), the fourth terminal (12-D) finishes the data transmission and the data is stored in the first memory (61) of the first repeater device (20-1). Therefore, only the second repeater device (20-2) outputs the data signal. Then, the second repeater device (20
-2) second memory (62) stored in the seventh terminal (12-
G) data is taken into the 4th terminal (12-D),
It is stored in the second memory (62) of the first repeater device (20-1). In this state, the fourth terminal (12-D) takes in all the data.

On the other hand, in the third network (1C), since the sixth terminal (12-F), the fifth terminal (12-E) and the seventh terminal (12-G) have finished data transmission, Only the second repeater device (20-2) outputs the data signal. And
The data of the third terminal (12-C) stored in the first memory (61) of the second repeater device (20-2) is the fifth terminal (12-E).
And 6th terminal (12-F) and 7th terminal (12-G). In this state, the fifth terminal (12-E), the sixth terminal (12-F) and the seventh terminal (12-G) take in all the data.

<Timing 8> Next, as shown in FIG. 11, in the first network (1A), the second terminal (12-B), the first terminal (12-A) and the third terminal (12-). C) has completed data transmission, the first repeater device (20-
Only 1) outputs the data signal. The data of the seventh terminal (12-G) stored in the second memory (62) of the first repeater device (20-1) is stored in the first terminal (12-A) and the second terminal (12-B). ) And the third terminal (12-C). In this state, the first terminal (12-A), the second terminal (12-B) and the third terminal
The terminal (12-C) will capture all data.

On the other hand, in the second network (1B) and the third network (1C), the fourth terminal (12-D) to the seventh terminal
Since the reception of the terminal (12-G) is completed, data transmission will not be performed. Then, while the transmission and reception of data between the first terminal (12-A) to the seventh terminal (12-G) are all completed by the above operation, the data transmission is repeated by the above operation.

-Effects peculiar to the embodiment-As described above, according to this embodiment, one packet of data is stored based on the data signal received by the bidirectional repeater device (20), and the predetermined transmission timing is set. Since the high speed response is not so required because the data signal is output in (1), a semiconductor element similar to the terminal (12) can be used without using a high performance semiconductor element. As a result, the device itself can be made inexpensive.

Further, since the data having a higher priority among the stored data can be output, the control accuracy can be improved.

Further, since unnecessary data can be deleted from the stored data, the traffic on the communication path (11) can be reduced.

Further, since the air conditioning control signal can be accurately transmitted between the plurality of terminals (12, 12, ...) As the air conditioning unit, highly reliable air conditioning control can be performed.

-Other Modifications-Although the transmission of the data signal for air conditioning control has been described in the present embodiment, the inventions of claims 1 and 2 can be applied to various data transmissions.

Although the transmission of the AMI signal has been described, the invention of claim 1 can be applied to various signal transmissions.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of the present invention.

FIG. 2 is a circuit block diagram showing a data communication system.

FIG. 3 is a schematic diagram of a bidirectional repeater device showing a data storage state.

FIG. 4 is a data transition diagram of the data communication system in the timing 1 state.

FIG. 5 is a data transition diagram of the data communication system in the timing 2 state.

FIG. 6 is a data transition diagram of the data communication system in the timing 3 state.

FIG. 7 is a data transition diagram of the data communication system in the timing 4 state.

FIG. 8 is a data transition diagram of the data communication system in the timing 5 state.

FIG. 9 is a data transition diagram of the data communication system in the timing 6 state.

FIG. 10 is a data transition diagram of the data communication system in the timing 7 state.

FIG. 11 is a data transition diagram of the data communication system in the timing 8 state.

FIG. 12 is a configuration diagram of a conventional data communication system.

FIG. 13 is a timing diagram showing a conventional data flow.

[Explanation of symbols]

10 Data communication system 1A First Network 1B Second network 11 communication path 12 terminals 20 bidirectional repeater device 30 First transceiver 40 Second transceiver 50 Signal controller 60 MPU 61 First memory 62 Second memory 63 Writing means 64 reading means

Continuation of the front page (56) Reference JP-A-5-268229 (JP, A) JP-A-1-93229 (JP, A) JP-A-2-277331 (JP, A) JP-A-8-139764 (JP , A) JP 7-7497 (JP, A) JP 62-204635 (JP, A) JP 7-58729 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB) Name) H04L 13/08 H04L 12/40 H04L 29/08 H04L 5/14 G06F 13/00

Claims (3)

(57) [Claims] 1. A bidirectional repeater device for bidirectionally transmitting a data signal between a first network (1A) and a second network (1B) to which terminals (12) are connected, respectively. A first transmitting / receiving unit (30) for transmitting / receiving a data signal to / from one network (1A), a second transmitting / receiving unit (40) for transmitting / receiving a data signal to the second network (1B), and the first transmitting / receiving unit A signal control section (50) for transmitting and receiving a data signal between the section (30) and the second transmitting and receiving section (40), and a first memory (61) provided in the signal control section (50) for storing data And a second memory (62) and a first transmitter / receiver (30) provided in the signal controller (50).
Writes one packet of data in the first memory (61) based on the data signal received from the first network (1A), while the second transmission / reception section (40) causes the second network (1)
A writing means (63) for writing one packet of data to the second memory (62) based on the data signal received from B), and the signal control section (50), and the second network.
Transmit the data of one packet stored in the first memory (61) in the released state of the communication path (11) of (1B) reading, the second transceiver (40) is de data signal to the second network (1B) While outputting the data signal to the second transmission / reception unit (40), the communication path (11) of the first network (1A) is vacant.
State by the read data of one packet stored in said second memory (62), the first transmitting and receiving unit (30) is de data signal first
A bidirectional repeater device comprising: a reading means (64) for outputting a data signal to the first transmission / reception unit (30) so as to be transmitted to a network (1A). 2. The bidirectional repeater device according to claim 1, wherein the data signal is an AMI signal. 3. The bidirectional repeater device according to claim 1 or 2, wherein the terminal (12) is an air conditioning unit.