JPH0856391A - Transmitter - Google Patents

Abstract

PURPOSE:To provide a transmitter with which transmission efficiency can be improved. CONSTITUTION:Plural indoor machines as first terminal equipment, plural outdoor machines as second terminal equipment and controller are connected through a bus for signal transmission. Concerning normal packets 1 to 5 to be transmitted from this controller to the indoor machines, the outdoor machines transmit packets for standstill time to the controller within a reception inhibition period T4 after the lapse of a bus idle period T2 and a synchronism recovery monitor period T3 from the end of transmission of the normal packet 1 between the normal packets 1 and 2, for example, in a pause term T1 for the continuous normal packets 1 to 4. Therefore, the packet for pause time can be exchanged during the pause time without affecting the exchange of normal packets.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission device which comprises a plurality of terminals such as an air conditioner and a controller and which transmits and receives data such as commands via a bus.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, a bus system is connected to a bus 20 as an air conditioner transmission system to which HBS (home bus system: EIAJ (Japan Electronic Machinery Manufacturers Association) standard ET-2101) is applied. The plurality of indoor units 11, 11, ...
And the plurality of indoor units 11, which are connected to the bus 20 and
There is a controller 12 for centrally controlling 11, ... The controller 12 transmits a packet such as a command for simultaneous control to all the indoor units 11, 11, ... Through the bus 20 and also transmits a packet such as a command for individual control for each indoor unit 11, 11 ,. Send. Further, each of the indoor units 11, 11, ... Receives a packet such as a command from the controller 12 and performs an operation according to the command, and includes information such as an operation status with respect to the controller 12. Send a packet.

FIG. 7 shows packets from the controller 12 to the indoor units 11, 11, ... And the indoor units 11, 11 ,.
In the state of packet transmission from the controller to the controller 12, the case where the transmission information amount (hereinafter referred to as traffic) on the bus 20 is the largest is shown. In FIG. 7, one packet consists of 10 bytes of information, and the transmission rate is 9600.
With bps, the transmission time for one packet is about 20 ms,
The pause time between each packet is 22.9 ms. According to the HBS standard, the idle time, which is a non-communication period for synchronizing frames and characters, is 10
In the transmission system of the air conditioner, the down time is set to 22.9 ms in consideration of performing the internal processing of each indoor unit 11, 11, ... During the down time. .

[0004]

However, in the transmission system of the air conditioner, the controller 1 does not operate during the downtime.
2 and the indoor units 11, 11, ... Are in a state in which packets are not transmitted (bus idle state), and reception processing is not performed, so the actual bit output period is 50% or less of the whole, and the transmission efficiency is very high. There is a problem of being bad.

Further, as shown in FIG. 8, when the outdoor unit 13 and the controller 14 are connected to the transmission system of the air conditioner of FIG. 7 to perform transmission between the indoor unit 11 and the outdoor unit 13, the bus is used. 30 traffic increases. Furthermore, FIG.
2, the fan coil 15, the ventilation unit 16, the air handling unit 17, etc. are connected, and the heat source device 20 for central air conditioning and the modem 2 are connected to the telephone line.
1 and the building management gateway 22 that is connected to the building management device 23. In this case, in order to perform transmission between a plurality of devices on the same bus, the types of packets are increased, or packets having a long data length are divided and transmitted at short intervals, which increases traffic. Therefore, the packets are likely to be linked together, and the priority of each packet determines the transmission order of the packets, and a packet with a low priority has a long transmission waiting time, resulting in poor responsiveness of the transmission system.

Therefore, an object of the present invention is to provide a transmission apparatus which can effectively utilize the idle time of a normal packet to improve the transmission efficiency.

[0007]

In order to achieve the above object, the transmission device according to the present invention detects packet contention and repeats retransmission of the packet when contention loss occurs until the contention loss is eliminated. And a first transmitting means for transmitting a normal packet to a signal transmission bus with a predetermined pause time or more before and after, and receiving the normal packet from the bus. In addition, in the transmission device to which the first terminal having the first receiving means that does not receive the packet during the pause time can be connected,
Second transmitting means connected to the bus for transmitting the pause time packet to the bus during the pause time or when the normal packet is not transmitted to the bus; and the pause time packet from the bus And a second terminal having a second receiving means for receiving the packet, the second terminal being connected to the second terminal via the bus, transmitting the normal packet to the bus, and the bus during the pause or the bus. A third transmitting means for transmitting the pause time packet to the second terminal when the normal packet is not transmitted to the third terminal; and a third means for receiving the normal packet and the pause time packet from the bus. And a controller having a receiving means.

According to a second aspect of the present invention, in addition to the first aspect of the present invention, the second transmitting means of the second terminal device is:
The normal packet is transmitted to the bus, and the second receiving means of the second terminal receives the normal packet from the bus.

A transmission device according to a third aspect is the transmission device according to the first or second aspect, wherein the controller determines whether the traffic on the bus is less than or equal to a predetermined amount.
When the first traffic determining means determines that the traffic on the bus is less than or equal to the predetermined value, the third transmitting means of the controller includes:
When the packet to be transmitted to the second terminal is the normal packet and the first traffic discriminating means discriminates that the traffic on the bus exceeds the predetermined value,
The third transmitting means of the controller is characterized in that the packet to be transmitted to the second terminal device is the pause time packet.

A transmission device according to a fourth aspect is the transmission device according to the second or third aspect, wherein the second terminal has a second traffic discriminating means for discriminating whether or not the traffic on the bus is less than a predetermined amount. When the second traffic discriminating means discriminates that the traffic on the bus is equal to or less than the predetermined value, the second transmitting means of the second terminal device transmits a packet to the controller or another second terminal device. While the second traffic discriminating means discriminates that the traffic on the bus exceeds the predetermined value, the second transmitting means of the second terminal unit is operated by the controller or the other first packet. It is characterized in that the packet to be transmitted to the two terminals is the pause time packet.

[0011]

According to the transmission device of the first aspect, the first transmission means of the first terminal device connected to the signal transmission bus is normally provided on the bus with a predetermined pause time or more before and after. The third receiving means of the controller, which transmits a packet and is connected to the first terminal via a bus, receives a normal packet from the first terminal. On the other hand, the third transmitting means of the controller transmits normal packets to the bus with a predetermined pause time or more before and after, and the first receiving means of the first terminal unit receives the normal packets from the controller. To receive. Also, the third transmitting means of the controller transmits the packet for pause time during the pause time or when the normal packet is not transmitted to the bus,
The second receiving means of the terminal device receives the pause time packet from the controller. On the other hand, the second transmitting means of the second terminal device transmits the pause time packet during the pause time or when the normal packet is not transmitted to the bus, and the third receiving means of the controller is the second terminal device. Receives a pause time packet from the device. At this time, since the first transmitting means does not receive the packet during the pause time, even if the pause time packet is transmitted and received between the controller and the second terminal device during the pause time, the first transmitting means It does not affect the transmission of normal packets sent and received between the controller and the controller. Therefore, by transmitting the packet for the pause time during the pause time of the normal packet, the packet can be transmitted by effectively utilizing the pause time, and the transmission efficiency can be improved.

Therefore, the above second terminal is newly added to the conventional system, and the communication function of the controller is provided with the communication function by the packet for the down time, or the controller is provided with the communication function by the packet for the down time. It is possible to construct a highly responsive transmission system with improved transmission efficiency simply by replacing it with a controller.

According to the transmission device of the second aspect,
2. The transmission device according to claim 1, wherein the second transmission means of the second terminal device transmits the normal packet of the bus,
The second receiving means of the second terminal receives a normal packet from the bus. Therefore, the second terminal device transmits a normal packet to the first terminal device, the controller and the other second terminal device or a pause time packet to the controller and the other second terminal device as necessary. You can
For example, if the data length of the packet to be transmitted by the second terminal is such that it cannot be transmitted during the pause time, it is transmitted as a normal packet and the data length of the packet can be transmitted during the pause time. When the length is set, the packet for pause time is transmitted. In addition, the above controller similarly performs, according to the data length of the packet to be transmitted,
It is possible to properly use the normal packet and the pause packet for the second terminal.

Therefore, the second terminal device and the controller can efficiently use the normal packet and the pause time packet in accordance with the packet to be transmitted.

According to the transmission device of claim 3,
3. The transmission device according to claim 1, wherein when the first traffic discriminating means discriminates that the traffic on the bus is less than or equal to a predetermined amount, the third transmitting means of the controller transmits a packet to be transmitted to the second terminal device. It is a normal packet. On the other hand, when the first traffic discriminating means determines that the traffic on the bus exceeds the predetermined amount, the third transmitting means of the controller is for the pause time for transmitting the packet to be transmitted to the second terminal during the pause time. Let it be a packet. That is, when the traffic on the bus is less than a predetermined amount, the controller sends normal packets to the first and second terminals, and when the traffic is more than the predetermined amount, the controller sends normal packets to the first terminal. The transmission is performed, and at the same time, the second terminal device is transmitted with a pause time packet during the pause time.

Therefore, the traffic of the bus allows the controller to selectively transmit the normal packet and the pause time packet for efficient transmission.

According to the transmission device of claim 4,
The transmission device according to claim 2 or 3, wherein when the second traffic discriminating means discriminates that the traffic on the bus is less than or equal to a predetermined amount, the second transmitting means of the second terminal unit is the controller or another second terminal. The packet to be sent to the container is a normal packet. On the other hand, when the second traffic discriminating means discriminates that the traffic on the bus exceeds the predetermined amount, the second transmitting means of the second terminal device transmits the packet to be transmitted to the controller or another second terminal device to the down time. It is a packet for pause time to be transmitted during. That is, when the traffic on the bus is less than a predetermined amount,
The second terminal transmits to the first terminal, another second terminal and the controller in a normal packet, and when the traffic is larger than a predetermined amount, the second terminal normally transmits to the first terminal. The packet is transmitted, and at the same time, the packet is transmitted to the other second terminals and the controller during the pause time by the pause time packet.

Therefore, depending on the traffic on the bus, the second terminal can selectively transmit the normal packet and the pause time packet for efficient transmission.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The transmission device of the present invention will be described in detail below with reference to an embodiment.

FIG. 1 is a block diagram of a transmission system of an air conditioner using a transmission device according to an embodiment of the present invention,
Reference numeral 1 denotes a plurality of indoor units (only one is shown in FIG. 1) as an example of a first terminal device connected to a bus 10 for signal transmission.
Is a plurality of outdoor units (only one is shown in FIG. 1) as an example of a second terminal connected to the plurality of indoor units 1 via a bus 10, and 3 is a unit for the indoor unit 1 and the outdoor unit 2. A controller that is connected via a bus 10 and that centrally controls the indoor unit 1 and the outdoor unit 2. The indoor unit 1 has a first transmitting unit 1a as a first transmitting unit that transmits a normal packet at intervals of a predetermined pause period or more, and receives a normal packet and does not receive the packet during the pause time. It has the 1st receiving part 1b as a 1st receiving means. Further, the outdoor unit 2 includes a second transmitting unit 2a as a second transmitting unit that transmits the packet for the down time during the down time, and a second transmitting unit 2a as the second receiving unit that receives the packet for the down time.
It has a receiver 2b. In addition, the controller 3
Includes a third transmitting unit 3a as a third transmitting unit for transmitting the normal packet and the pause time packet, and a third receiving unit 3b as a third receiving unit for receiving the normal packet and the pause time packet. There is.

In the above configuration, as shown in FIG. 2 (a), for example, when the controller 3 transmits the normal packets A and B to the indoor unit 1 with a pause time in this order, the normal packet B is suspended. After the lapse of time, the bus idle period is set until the next normal packet is transmitted. At this time, as shown in FIG. 2B, when the downtime packets C and D are transmitted from the outdoor unit 2 to the controller 3, the time Ta
When there is a transmission request for the pause time packet C, there is a transmission request for the normal packet A, the normal packet A and the pause time packet C compete, and the pause time packet C loses. Then, the pause time packet C is transmitted within the next pause time that the normal packet A has transmitted. Note that the normal packet and the pause time packet will be described later in P so that the normal packet always wins the pause time packet.
The priority is set by R (priority code).
Further, when there is a transmission request for the pause time packet C at the time Tb during transmission of the normal packet A, the pause time packet C is similarly transmitted within the next pause time transmitted by the normal packet A.

Next, when there is a transmission request for the pause time packet D at time Tc within the pause time after transmitting the normal packet B, the pause time packet is sent at the same timing as the normal packet in the next bus idle period. Send a D and then take a rest period. That is, if there is no contention with the normal packet, the above-mentioned packet for pause time D is completed as it is. Note that contention detection is also performed in the pause time packet during the pause time.

Further, for example, as shown in FIGS. 3 (a) and 3 (b), normal packets 1 to 4 are consecutive, and normal packets 1, 2,
The pause time from the end of transmission of 3 to the next normal packet is 2
In the case of 2.9 ms, as shown in FIG. 3C, the pause time T1 is a bus idle period T2 (about 4.5 ms) for recognizing a packet end, a reception prohibition period T4 (about 18 ms) and The synchronization recovery monitoring period T5. A packet is inserted after the synchronization recovery monitoring period T3 within the reception inhibition period T4 (about 18 ms). The transmission speed in this case is 9600 bps
Then, approximately 16 bytes of data can be transmitted in one packet within the reception prohibition period T4. In addition, the structure of the packet is PR (priority code), SA (self address),
DA (destination address), CC (control code), BC (telegram length code), data, FCC (frame check code), D
MY (dummy data), ACK / NAK (affirmative response / negative response), and since there are 8 characters other than data, the maximum data portion is 8 characters.

FIG. 4 shows the transmission timing of the pause time packet inserted in the pause time T1. After sending the normal packet 1, the idle time packet is sent after the bus idle time T2 (about 4.5 ms) and the synchronization recovery monitoring period T3 (about 0.2 ms) required to correctly recognize the packet end are passed. To do. Then, after the pause time T1 has elapsed, the next normal packet B is transmitted. In order to secure the synchronization recovery monitoring period T5 before the transmission of the normal packet B, the pause time packet has a data length that is not longer than the reception prohibition period T4. In addition, FIG. 4 shows a structure of a packet to be individually transmitted and a packet to be broadcast (a packet to be simultaneously transmitted to all terminals) so as to correspond to the normal packets 1 and 2 and the idle period packet, respectively. ing.

The operation of transmitting the packet for the down time will be described below with reference to the flowchart of FIG.

First, when the transmission / reception of the normal packet is completed in step S1, the process proceeds to step S2 to clear and start the pause time timer. Next, in step S3, it is determined whether or not the bus is in the idle state, that is, whether or not a bit is received from the bus 10. If it is determined that the bit is not in the bus idle state, the process proceeds to step S4. On the other hand, if it is determined in step S3 that the bus is not idle, the process returns to step S2.

Next, in step S4, it is determined whether or not the pause time timer value is T2 or less. If it is determined that the pause time timer value is T2 or less, the process returns to step S3 while the pause time timer value exceeds T2. If it is determined that the result is yes, the process proceeds to step S5. Then, in step S5, it is determined whether or not a start bit is received. If it is determined that the start bit is received, the process proceeds to step S6. If it is determined that the start bit is not received, the process proceeds to step S10. . Next, in step S10, the pause time timer value is (T2 +
It is determined whether or not T3) or more, and the pause time timer value is (T2 +
If it is determined that T3) or more, the process proceeds to step S6, while if it is determined that the pause time timer value is less than (T2 + T3), the process returns to step S5.

Next, in step S6, it is determined whether or not there is a transmission request for the pause time packet. If it is determined that there is a transmission request for the pause time packet, the process proceeds to step S7, and the pause time packet is stored. On the other hand, if it is determined that there is no request for transmission of the pause time packet while transmitting, step S7
Skip.

Next, at step S8, the pause time timer value is set.
It is determined whether (T1-T5) or less, and the pause time timer value is
If it is determined to be (T1-T5) or less, step S8 is repeated, while if the pause time timer value exceeds (T1-T5), the process proceeds to step S9. Then, in step S9, the processing of the normal packet synchronization recovery monitoring period T5 is performed. After that,
Normal packet transmission / reception processing continues.

As described above, the pause time packet is transmitted during the pause time T1 of the normal packet, and in the bus idle state, the pause time packet is transmitted at the same timing as the normal packet, so that the packet is efficiently transmitted. Can be transmitted. In addition, a device as a second terminal is newly added to the conventional transmission system, and the communication function of the controller 3 is changed so as to be able to transmit the packet for the down time, or the controller 3 is changed to the packet for the down time. By replacing the controller with a transmission function, the transmission efficiency can be improved and the transmission system with good response can be expanded.

Further, for example, when the data length of the packet to be transmitted is such that it cannot be transmitted during the pause time, it is transmitted as a normal packet, and when it is such that it can be transmitted during the pause time, the pause time packet is used. Send with. Therefore,
It is possible to perform efficient transmission according to the packet to be transmitted.

Further, the controller 3 is provided with a traffic discriminating section 3c as a first traffic discriminating means, and the traffic discriminating section 3c discriminates whether or not the traffic on the bus 10 is below a predetermined amount, and the traffic is detected. In the case of a fixed amount or less, the normal packet is used for transmission to the outdoor unit 2, while when the traffic of the bus 10 exceeds a predetermined amount, the outdoor unit 2 may be used for transmission using the pause time packet. In addition, the outdoor unit 2 has a second
Traffic discriminating section 2c as traffic discriminating means
The traffic discriminating unit 2c discriminates whether or not the traffic of the bus 10 is less than or equal to a predetermined amount, and when the traffic is less than or equal to the predetermined amount, the indoor unit 1 and the other outdoor units 2
While the normal packet is transmitted to the controller 3, when the traffic of the bus 10 exceeds a predetermined amount, the packet may be transmitted to the other outdoor unit 2 and the controller 3 using the packet for the down time. In this case, the normal packet and the pause time packet can be selectively used depending on the traffic state of the bus to enable efficient transmission.

The traffic discriminating section 3c of the controller 3 and the traffic discriminating section 2c of the outdoor unit 2 discriminate whether or not the transmitted normal packet has a predetermined number of competition losses or more, and a predetermined number of competition losses. In the following cases, it is assumed that the traffic is less than or equal to a predetermined amount, and when the competition loss exceeds a predetermined number of times, the traffic exceeds the predetermined amount. Further, the above-mentioned traffic discrimination is performed by accumulating the idle time per unit time, determining whether or not the total is less than or equal to a predetermined time, and if the total time exceeds the predetermined time,
It may be determined that the traffic exceeds the predetermined amount while the traffic is less than or equal to the predetermined amount while the traffic is less than or equal to the predetermined amount.

In the above embodiment, the indoor unit 1 was used as the first terminal to transmit the packet, but the packet may be transmitted only by the first terminal and the controller without using the first terminal. Good.

Further, although the outdoor unit 2 as the second terminal device transmits the packet for the down time to the controller 3,
A pause time packet may be transmitted from the controller to the second terminal. Further, the packet for the down time may be mutually transmitted between the second terminals.

Although the HBS transmits the packet, the packet transmission is not limited to the HBS, and the packet transmission is performed by detecting the packet competition and repeating the packet retransmission when the competition loses until the competition loses. The transmission device of the present invention may be used in a transmission system to be used.

Although one controller is used, two or more controllers may be connected to the bus and used.

Also, 9600 bps via the bus 10
Although the packet was transmitted at the transmission rate of, the transmission rate is not limited to this.

Although the first terminal is the indoor unit 1 and the second terminal is the outdoor unit 2, the invention is not limited to this, and the first and second terminals include a fan coil, a ventilation unit, and an air handling unit. Needless to say, it may be a heat source device for central air conditioning, a modem, a building management gateway, or the like.

Although the packet is transmitted by wire via the bus 10, a wireless transmission medium may be used.

[0041]

As is apparent from the above, the transmission device according to the first aspect of the present invention detects packet contention, and when contention is lost, repeats retransmission of the packet until contention is eliminated. A transmitting device for transmitting a signal, the first transmitting means transmitting a normal packet to a signal transmission bus with a predetermined pause time or more before and after, and receiving the normal packet from the bus In the transmission device to which the first terminal having the first receiving means that does not receive the packet during the pause time can be connected, the second transmitting means of the second terminal connected to the bus is paused on the bus. The packet for the down time is transmitted during the time or when the normal packet is not transmitted to the bus, and the second packet of the second terminal device is transmitted.
The receiving means receives the pause time packet from the bus, and the third transmitting means of the controller connected to the second terminal device via the bus transmits the normal packet to the bus during the pause time or While the normal packet is not being transmitted to the bus, the pause time packet is transmitted to the bus, while the third receiving means of the controller receives the normal packet and the pause time packet from the bus.

Therefore, according to the transmission device of the present invention, since the first transmitting means does not receive the packet during the pause time, the controller and the second terminal device do not receive the packet during the pause time. Even if the pause time packet is transmitted / received between them, it does not affect the transmission of the normal packet transmitted / received between the first transmission means and the controller. Therefore, it is possible to improve the transmission efficiency by transmitting the packet during the idle time which has been the non-communication period in the past. Further, a second terminal is newly added to the conventional transmission system, and the communication function of the controller is changed to support the packet for the down time, or the controller is replaced with the controller having the communication function for the down time packet. In addition, the transmission efficiency can be improved and the transmission system can be expanded with good response.

The transmission apparatus of the invention of claim 2 is the transmission apparatus of claim 1, wherein the second transmitting means of the second terminal device has substantially the same timing as the first transmitting means of the first terminal device. In addition to transmitting the normal packet to the bus, the second receiving means of the second terminal receives the normal packet from the bus.

Therefore, according to the transmission device of the second aspect of the present invention, the second terminal is provided with the first terminal, if necessary.
A normal packet can be transmitted to the controller and other second terminals, or a pause time packet can be transmitted to the controller and other second terminals. For example, if the data length of the packet to be transmitted by the second terminal is such that it cannot be transmitted during the pause time, it is transmitted as a normal packet and the data length of the packet can be transmitted during the pause time. When the length is set, the packet for pause time is transmitted.
In addition, by adding the function of receiving a normal packet to the second terminal device, the controller can also transmit the normal packet and the pause time packet separately to the second terminal device in the same manner. is there. Therefore,
The second terminal device and the controller can effectively use the normal packet and the pause time packet properly according to the packet to be transmitted, and can efficiently perform the transmission.

The transmission apparatus according to a third aspect of the present invention is the transmission apparatus according to the first or second aspect, wherein the controller includes first traffic discriminating means for discriminating whether or not the traffic on the bus is below a predetermined amount. When the first traffic discriminating means discriminates that the traffic on the bus is less than or equal to the predetermined value, the third transmitting means of the controller makes the packet to be transmitted to the second terminal device a normal packet, while
When the traffic discriminating means discriminates that the traffic on the bus exceeds the predetermined value, the third transmitting means of the controller makes the packet to be transmitted to the second terminal device a pause time packet.

Therefore, according to the transmission device of the third aspect of the present invention, when the traffic on the bus is less than a predetermined amount, the controller transmits the normal packet to the first and second terminals, while the traffic is transmitted to the first and second terminals. When the number is larger than the fixed amount, the normal packet is transmitted to the first terminal device and the second terminal device is transmitted with the pause time packet during the pause time. Therefore, the controller can effectively use the normal packet and the pause time packet properly according to the state of the traffic on the bus to enable transmission with high transmission efficiency.

The transmission device of the invention of claim 4 is the transmission device of claim 2 or 3, wherein the second terminal is
A second traffic discriminating means for discriminating whether or not the traffic on the bus is below a predetermined amount, and when the second traffic discriminating means judges that the traffic on the bus is below the predetermined value, the second transmitting means of the second terminal device. While it is a normal packet to be sent to the controller or other second terminal,
When the second traffic discriminating means discriminates that the traffic on the bus exceeds the predetermined value, the packet transmitted by the second transmitting means of the second terminal to the controller or another second terminal is regarded as a pause time packet. Is.

Therefore, according to the transmission device of the fourth aspect of the present invention, the second terminal is provided to the first terminal, another second terminal and the controller when the traffic on the bus is less than a predetermined amount. While sending in normal packets,
When the traffic is larger than a predetermined amount, the normal packet is transmitted to the first terminal device, and the second terminal device and the controller are transmitted with the pause time packet during the pause time. Therefore, depending on the traffic state of the bus, the second terminal device can effectively use the normal packet and the pause time packet to perform transmission with good transmission efficiency.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a transmission system of an air conditioner using a transmission device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a state in which a pause time packet is inserted during the pause time.

FIG. 3 is a diagram showing a timing at which a packet for a pause time is inserted.

FIG. 4 is a diagram showing a non-communication period and a synchronization recovery monitoring period before and after a pause time packet during the pause time.

FIG. 5 is a flowchart showing an operation of transmitting a pause time packet.

FIG. 6 is a diagram showing a configuration of a conventional air conditioner transmission system.

FIG. 7 is a diagram showing a transmission state in the transmission system of the air conditioner.

FIG. 8 is a diagram showing a configuration in which an outdoor unit and a centralized control device are added to the transmission system of the air conditioner of FIG. 7.

FIG. 9 is a diagram showing a configuration of a transmission system in which heat source devices other than an air conditioner, devices such as a modem are connected.

[Explanation of symbols]

1 ... Indoor unit, 1a ... 1st transmission part, 1b ... 1st reception part, 2 ...
Outdoor unit 2a ... 2nd transmission part, 2b ... 2nd reception part, 2c ... 2nd traffic discrimination part 3 ... Controller, 3a ... 3rd transmission part, 3b ... 3rd reception part, 3c ... 1st traffic discrimination part, 10 ... bus.

Claims (4)

[Claims] 1. A transmission device which detects a packet conflict and repeats the above-mentioned packet retransmission when the conflict is lost until the competitive loss disappears, thereby transmitting a signal.
First transmitting means (1) for transmitting normal packets to the signal transmission bus (10) with a predetermined pause time or more before and after.
A transmission device to which a first terminal device (1) having a) and a first receiving means (1b) that receives the normal packet from the bus (10) and does not receive the packet during the pause time can be connected. A second transmitting means connected to the bus (10) and transmitting the pause time packet to the bus (10) during the pause time or when the normal packet is not transmitted to the bus (10) A second terminal device (2) having (2a) and second receiving means (2b) for receiving the packet for downtime from the bus (10), and the second terminal device (2) to the bus. Connected via (10) to send the normal packet to the bus (10) and to the bus (10) during the down time or the bus (1).
0) the normal packet from the bus (10), and the third transmitting means (3a) for transmitting the pause time packet to the second terminal (2) when the normal packet is not transmitted. And a controller (3) having a third receiving means (3b) for receiving the packet for pause time. 2. The transmission device according to claim 1, wherein the second transmitting means (2a) of the second terminal (2) is the bus (1).
0) to the normal packet, and the second receiving means (2b) of the second terminal (2) receives the normal packet from the bus (10). 3. The transmission device according to claim 1, wherein the controller (3) includes a first traffic discriminating means (3c) for discriminating whether or not the traffic of the bus (10) is less than a predetermined amount. If the first traffic discriminating means (3c) discriminates that the traffic on the bus (10) is less than or equal to the predetermined value, the third traffic of the controller (3) is provided.
The transmitting means (3a) makes the packet to be transmitted to the second terminal (2) the normal packet, while the first traffic discriminating means (3c) causes the traffic of the bus (10) to exceed the predetermined value. If it is determined that
The third transmitting means (3a) of (3) is the second terminal device (2).
A transmission device, wherein the packet to be transmitted to the packet is the packet for the pause time. 4. The transmission device according to claim 2 or 3, wherein the second terminal (2) determines whether or not the traffic of the bus (10) is less than or equal to a predetermined amount. 2c), and the second traffic discriminating means
When (2c) determines that the traffic on the bus (10) is less than or equal to the predetermined value, the second transmitting means (2a) of the second terminal device (2) causes the controller (3) or the other first When the second traffic discriminating means (2c) discriminates that the traffic on the bus (10) exceeds the predetermined value while the packet to be transmitted to the second terminal device (2) is the normal packet, the second terminal The second transmitting means (2) of the container (2)
a) is the controller (3) or the other second terminal device
A transmission device characterized in that the packet to be transmitted in (2) is the above-mentioned packet for pause time.