JP2003279111A - Ventilation adjusting device and ventilation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem in a communication between a ventilation device having either a unidirectional mode transmitting means or a half-duplex mode transmitting means and a ventilation adjusting device for controlling the ventilation device, that installation work is increased as an address is required to be set to each respective terminal for recognition, and the flexibility in future design of the device is restricted by requiring all terminals of low to high cost to have a communication system having the same specification so as to improve compatibility and facilitate system maintenance. <P>SOLUTION: The ventilation adjusting device for communicating with the ventilation device waits unidirectional mode transmittance from the ventilation device for a predetermined time period after establishing a connection with the ventilation device. If the unidirectional mode transmittance is not detected for the predetermined time, the ventilation adjusting device transmits the ventilation device in the half-duplex mode. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system and a system configuration for constructing a system capable of centrally managing a plurality of housing equipment such as an air conditioner, a ventilation and a lighting installed in a house represented by a ventilation system. is there.

[0002]

2. Description of the Related Art FIG. 9 is a block diagram of a system for monitoring and controlling the operating conditions of a plurality of ventilation devices, lights, etc. installed in a building such as a house at one location. In the figure, a ventilation system 101 includes a plurality of ventilation devices 102 arranged in each room or the like in a building, a power supply line 103 from which drive power for the ventilation devices 102 is drawn, and a power supply line 103 thereof.
And a centralized control device 104 having a function of operating a switch to monitor the energized state.

By doing so, it is possible to monitor the operating conditions of a plurality of ventilation devices and control them.

Further, in Japanese Patent Laid-Open No. 62-125249 and Japanese Patent Laid-Open No. 9-55984, the wiring used in such a ventilation system becomes thick due to the concentration of driving power supply wiring, so that it is widely installed. Space is required, construction is difficult, and although it is simple, considering that the number of ventilation devices that make up the system increases, it becomes expensive, It uses the control by the data exchange by the communication means.

[0005]

However, since it is necessary to provide an address for recognizing each terminal in communication, the time and effort required for construction increase, and in consideration of equipment renewal, only one communication method can be fixed. Therefore, if compatibility is ensured, the specifications will be the same from an inexpensive terminal to an expensive terminal, and there is a problem that the degree of freedom in design in the future will be restricted.

The present invention has been made to solve such a problem, and is inexpensive, easy to construct and highly reliable.
It is an object of the present invention to provide a communication type ventilation volume adjusting device and a ventilation system that facilitate the maintenance of compatibility in the future.

[0007]

[Means for Solving the Problems]

A ventilation adjusting device for communicating with a ventilator, which waits for transmission of a unidirectional mode from the ventilator until an arbitrary time elapses after a line with the ventilator is connected, and then elapses an arbitrary time. If there is no transmission in unidirectional mode by the time of transmission, the transmission in half-duplex mode is sent to the ventilation device.

Also, the ventilation amount adjusting device is a half of the ventilation device.
If there is no response within an arbitrary time after performing the heavy mode transmission, it is determined that the ventilation device is stopped.

The ventilation amount adjusting device includes a plurality of ventilation devices having either one of the unidirectional mode transmitting device and the half-duplex mode transmitting device, and a ventilation amount adjusting device communicating with the ventilation device. A ventilation system for controlling the sum of the intake air volume and the exhaust volume of a plurality of ventilation devices by means of a ventilation control device that transmits a unidirectional mode from the ventilation device between the ventilation control device and the ventilation device. Wait until an arbitrary time elapses after the line is connected, and if there is no transmission in the unidirectional mode before the arbitrary time elapses, perform half-duplex mode transmission to the ventilation device.

If there is no response from the ventilation device that has transmitted the half-duplex mode within an arbitrary time, the ventilation amount control device determines that the ventilation device is stopped.

Further, the ventilation function of the ventilation device having the unidirectional mode transmission means is only the exhaust function or the air supply function, and the ventilation function of the ventilation device having the half-duplex mode transmission means is the air supply function and the exhaust function. Is both.

[0013] A plurality of ventilation devices, a repeater for receiving the information of the air supply amount and the information of the exhaust amount of each ventilation device from the plurality of ventilation devices, and calculating the sum of the air supply amount and the exhaust amount, If the sum total is not within a predetermined range, the ventilation amount command device instructs the repeater to stay within the range, and the repeater has multiple ventilations. At least one of the air supply and exhaust of the equipment is changed.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. 1 is a configuration diagram of a ventilation system according to Embodiment 1 of the present invention.
In the figure, a ventilation system 1 is set in advance to adjust the ventilation amount (supply / exhaust amount) of the entire house according to the operating condition of the ventilation device 2 installed in a living room, washroom, toilet, etc. The ventilation device (hereinafter, ventilation amount adjusting device) 3 and a communication line 4 that connects each of the plurality of ventilation devices 2 to the ventilation amount adjusting device 3. In this ventilation system 1, the ventilation amount adjusting device 3 controls the air supply amount and the exhaust amount of the five ventilation devices by the four ventilation devices 2 and the one ventilation amount adjusting value device 3 so as to be equal. Although not shown, the driving power source and the operating unit of the ventilation device 2 and the ventilation amount adjusting device 3 are provided in each.

FIG. 2 is a circuit diagram showing a basic configuration of a transmission circuit for performing communication. In the figure, the part with the base unit is shown in FIG.
The configuration of the ventilation amount adjusting device 3 is the configuration of the ventilation device 2, and the child device is the configuration of the ventilation device 2. In such a transmission circuit 5, a voltage is generated in the communication line 4 by activating the transistor 6 on the master side. On the slave side, the photocoupler 7 detects whether or not a potential is generated on the communication line 4. On / off of the transistor 6 on the master side can be grasped as a logic signal by the photo coupler 7 on the slave side, and the transmission from the master to the slave is established. In addition, the transistor 6 on the base unit side
A potential difference between the communication lines can be generated by starting and stopping the photocoupler 8 when the power is on, and the potential on the communication line 4 is detected by the master unit side, so that It becomes possible to transmit to the side. The diode bridge 9 provided on the slave side is provided to make the communication line 4 non-polar. There are a plurality of such child devices (ventilation device 2), and the parent device side has corresponding transmission circuits, so that the ventilation device 2 is wired in a star shape as shown in FIG.

FIG. 3 is a flow chart of the communication procedure of the master unit (ventilation rate adjusting device) in this ventilation system, and FIG.
Is a flow chart of a monitor output type communication procedure of a slave unit (ventilation device) in this ventilation system, FIG. 5 is a flow chart of a baseband type communication procedure of a slave unit (ventilation device) in this ventilation system, and FIG. 6 is a monitor It is an example of a specification of an output signal. The monitor output type referred to in the present invention is communication having a unidirectional transmission mode that unilaterally outputs only its own state, and the baseband method is a half-duplex that enables bidirectional communication. A communication having a mode transmission mode.

The four ventilation devices 2 in FIG. 1 need only have one of the transmission modes of the unidirectional mode and the half-duplex mode, and the ventilation devices 2 are unified to either transmission mode. It does not have to be.

Next, the ventilation system communication control will be described. In FIG. 3, the ventilation volume adjusting device 3 which is the master unit
First, No. The communication is performed with the ventilation device 2 of No. 1, but at this time, the operation of the transmission circuit 5 in FIG. 2 will be described. The transistor 6 is turned on, a potential is generated in the communication line 4, and the transmission line is in the active state. And A communication line can be connected by the operation of the transmission circuit 5 by the ventilation amount adjusting device 3 (S1).

When the communication line is connected by the master unit, as shown in FIG. 4, in the ventilation device 2 which is the slave unit, the connection of the line is monitored by monitoring the potential generation of the communication line 4 (S1).
1) It is determined whether or not the line is connected (S12), and if not connected, the line connection is monitored again in S11. If the line is connected, a monitor output (single output) according to the operation state for an arbitrary period is performed. (Direction transmission mode) is transmitted (S1)
3). At this time, as shown in FIG. 6, the modulation for setting the start / stop frequency of the photocoupler 8 according to the ventilation air volume is performed. On the other hand, when it is not recognized that the line is connected in s12, the process returns to S11 and is performed again. Also, monitor output for any period in S13 (unidirectional mode transmission mode)
After that, returning to S11, the line state is confirmed again, and if the line state is the connected state, this fixed operation of transmission is repeated a preset number of times.

On the other hand, the master unit, as shown in FIG.
It is determined whether or not the monitor output (transmission mode in the unidirectional mode) from the slave can be received (S2). If it cannot be received, an arbitrary time after the line is connected (the "arbitrary time" in the present invention means that the setter may set the length to some extent when setting the time. Good,
After once setting, it is determined whether or not a certain time has passed until the resetting (S3), and the process of S2 is repeated until an arbitrary time has passed. Arbitrary time elapses in S3,
In other words, if the base unit determines that the monitor output (transmission mode in the unidirectional mode) is not being transmitted within an arbitrary period after the line is connected, the base unit (transmission mode in the half-duplex mode) is used to detect the output of the slave unit. A request command for confirming the state is transmitted (S4).

When the request command is transmitted by the master unit, the ventilator 2 as a slave unit monitors the connection of the lines by monitoring the potential generation of the communication line 4 as shown in FIG. 5 (S21). , It is determined whether the line is connected (S2
2) If it is not connected, the line connection is monitored again in S21, and if it is connected, the baseband system (half-duplex mode transmission mode) communication is transmitted by the process of S4 in FIG. Is received (S23), and if not received, it is determined whether an arbitrary time has elapsed since the line was connected (S24), and the process of S23 is repeated until the arbitrary time has elapsed. . If it is determined in S24 that an arbitrary time has elapsed, that is, the slave unit has not received the communication of the baseband method (transmission mode of the half-duplex mode) within an arbitrary period after the line connection, the line is set by the master unit. It is judged whether or not it has been blocked (S25), and if it is not blocked,
The process of S25 is repeated until it is cut off, and if it is cut off, the process returns to the process of S21 again to monitor the connection of the line.
In addition, in the process of S23, when the transmission of the baseband method (transmission mode of the half-duplex mode) from the master unit can be received, the slave unit transmits a response (S26) and performs the process of S25.

On the other hand, the master unit, as shown in FIG.
It is determined whether or not the response of the baseband method (transmission mode of the half-duplex mode) from this slave unit has been received (S5),
If it cannot be received, it is determined whether or not an arbitrary time has elapsed from the transmission of the request command for confirming the state of the handset by the baseband method (transmission mode of the half-duplex mode) (S
6), the process of S5 is repeated until an arbitrary time has elapsed.
If any time elapses in S6, that is, if the communication of the baseband system (transmission mode of the half-duplex mode) from the slave is not received, the communication with the slave is cut off, and this cutoff is, for example, 3 When the child machine continues for a number of times, it is judged that the child machine is stopped (S7), and it is judged that the other states are the same as before, and the child machine shown in FIG. 2) and the base unit, the transistor 6 in the transmission circuit 5 is turned off, and the communication is terminated by disconnecting the line.
o. 2 goes to the communication process with the line of the ventilation device 2 (S
8).

The slave unit (ventilator 2 of No. 1) is a ventilator having a monitor output (transmission mode of unidirectional mode) type transmission mode, and the monitor output (unidirectional mode) is processed in S2. When the slave unit (ventilator 2 of No. 1) has a baseband method (transmission mode of half-duplex mode) type transmission mode, Even if the baseband method (transmission mode of the half-duplex mode) type response can be received in the process of S5, the process proceeds to the process of S8 and the communication is terminated by disconnecting the line. The communication processing with the line of the ventilation device 2 of No. 2 is started.

Various types of ventilation devices are used in the ventilation system 1 as described above. For example, as the ventilation device 2 having the transmission means of the unidirectional mode, a ventilation fan installed in a kitchen or a bathhouse used in a general home corresponds. This is a ventilation fan that has only an exhaust function as a ventilation function (hereinafter,
Since it is an exhaust ventilation system), when controlling so as to maintain the balance between the air supply amount and the exhaust amount of the entire building, even if the exhaust gas is in an excessive exhaust state, it is not possible to switch to the air supply. Further, when this exhaust ventilation device is operated, there is a possibility that a part of the building may have a bad odor or smoke, and it may be urgently used for safety. Therefore, it is not appropriate to forcibly stop the exhaust under the control of the overall ventilation control of the building. For this reason, the exhaust ventilation system sends the operation information in one way by means of the unidirectional mode transmission means, and the ventilation volume adjustment means grasps this information so that the total supply / exhaust volume in the whole building ventilation can be calculated. Not only to grasp
It is important in terms of safety.

In addition to this, in the constant ventilation system for the entire building, exhaust air is constantly emitted from the sanitary or corridor called the dirty zone. Therefore, the ventilation function is used to ensure the air supply to the living room. A ventilation fan having only the air function (hereinafter, a ventilation device for air supply) may be installed. Especially in a room with a certain height above the ground,
If it is separated from the ventilation device that supplies and exhausts air due to the temperature difference in the building, the supplied air is less likely to flow, and a mechanism for forcibly taking in outside air is required. In addition, as the performance of the outside air cleaning filter used for ventilation systems with both ventilation and exhaust functions (hereinafter referred to as ventilation systems for air supply and exhaust) has increased, the pressure has dropped to a high level, and a ventilation system dedicated to supply air is used. It is also necessary to compensate for the pressure loss. Therefore, even in such an air supply exclusive ventilation device, there is a need for forcibly stopping air supply or changing settings because it is necessary to ensure air supply in the living room as described above. .

In addition, a small amount of air is constantly supplied to the living room so that dirty air due to smoking or the like can be rapidly discharged, or ventilation can be performed to remove hot air from inside the room to perform ventilation operation according to the situation. A ventilation fan for air supply and exhaust may be installed. Since such a supply / exhaust ventilation device can change different ventilation states of supply air and exhaust air and the air volumes thereof, it is desirable that the supply / exhaust ventilation device has a large amount of operation information and has a half-duplex mode transmission means. Also, in order to use this air supply / exhaust ventilation device as one of the ventilation devices for adjusting the supply / exhaust air volume balance of the entire house, it is necessary to receive a command to change the air supply amount. In order to realize various functions, it is necessary to have a half-duplex mode transmission means.

By performing such communication, the ventilation amount adjusting device 3, which is the parent device, grasps the operating state of each ventilation device 2 and calculates the sum of the supply and exhaust amounts of the four ventilation devices. By adding the total supply / exhaust amount to the self supply / exhaust amount, the self-operation is determined and operated so that the supply amount and the exhaust amount are equal.

By doing so, the ventilation volume adjusting device 3 as the master unit actually transmits / receives whether the transmission mode of the ventilation device 2 as the slave unit is the half-duplex mode or the unidirectional mode. It is possible to distinguish by the transmission mode, and it is possible to send and receive according to each transmission mode. Therefore, it is not necessary to store the individual transmission modes of multiple slave units in the master unit in advance. Even if a system can be configured and a ventilation device 2 is newly added, if any of these transmission modes is used, it is not necessary to allocate an address for the expansion, and the construction is simple.

Since inexpensive terminals and expensive terminals can be attached according to their individual specifications, there is no constraint on the degree of freedom in design in the future. That is, the monitor output type is
Since a specific pulse signal is output according to the operation, it can be configured with a simple oscillator circuit without installing a microcomputer and can be realized at low cost and in a small size. Here, after checking the line connection,
Since the monitor output procedure is used, the transmission is performed only when necessary, so that it is possible to provide power-saving and highly reliable transmission by eliminating interference with other lines. It should be noted that if the method of monitor output is adopted regardless of the line connection, the features of the present invention cannot be obtained, but it goes without saying that the device can be realized with a simpler configuration and the child device can be made inexpensive. In this way, the monitor output type makes it easy to perform monotonous operation such as toilets and washrooms, easily installs it in a ventilation device that is required to be inexpensive, does not become obsolete in the future, and continues as a facility system for a long time in the market It is possible to provide a highly reliable system.

On the other hand, the baseband system type has a format capable of two-way communication with the base unit, and therefore has abundant driving functions on the handset side and can transmit a larger amount of information, which is more advanced. Control and system can be realized. For example, it becomes possible to control the operation of each ventilation device from the ventilation amount adjustment device as needed, and it is also possible to transmit the temperature and humidity of the ventilated room and occupancy information, etc., and adjust the ventilation amount according to the air quality condition. It becomes possible to control, and it is possible to provide a high-quality ventilation system that forms a comfortable ventilation state.

Further, since it becomes easy to confirm whether or not communication is established for each communication line, high reliability can be obtained, and by treating communication interruption as a stop, it can be used like a ventilation device. This makes it easy to configure a device as a slave unit in which the location where the operation is performed and the location where the power supply is turned on / off are the same. Further, since the connection information of the child device is stopped, that is, initialized when the communication is cut off, it is possible to easily add the child device simply by connecting the wiring.

In this embodiment, the monitor output type pulse signal is modulated by frequency, but the same effect can be obtained by phase modulation or pulse width modulation. In addition, the communication procedure of the master unit was set to perform communication with the four slave units in order. However, the communication processing capacity of the master unit causes a plurality of units to simultaneously perform communication processing for each line, which increases the transmission amount. It is possible to provide a highly responsive advanced system.

Although described as a ventilation system, this communication system can be applied to a system such as a lighting system and an air conditioner, or a combined system, and similar effects can be obtained.

Embodiment 2. In the ventilation system of the first embodiment, when the number of ventilation devices 2 that are slaves is increased,
Since the number of lines corresponding to the number increases, the master needs to have transmission circuits for that amount, resulting in an increase in cost. In other words, it is desirable to provide a master unit with specifications that satisfy the maximum number of slave units, but the number that is actually connected and used is often less than the maximum number. As a result, the parent device tends to be over-specified and may be more expensive than necessary. This embodiment provides a ventilation system that solves such a problem.

FIG. 7 is a block diagram of the ventilation system according to the second embodiment. The components having the same functions as those of the ventilation system according to the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 7, the ventilation system 10 is similar to that of the first embodiment in that it has a plurality of ventilation devices 2, a ventilation amount adjusting device 3 and a communication line 4, but these ventilation devices 2 are The ventilation line adjusting device 3 is not directly connected by the communication line 4 but is connected to the ventilation amount adjusting device 3 via the relay 11.

Repeater 11 in this ventilation system 10
Includes a transmission circuit 5 (not shown, but similar to FIG. 2) to which fifteen ventilation devices 2 can be connected. This relay device 11 is different from the ventilation device 2 as a slave device in the first embodiment.
The information of the 15 ventilation devices 2 is collected by performing the same communication process as that of the ventilation amount adjustment device 3 as the parent device.
On the other hand, the repeater 11 is connected to the ventilation amount adjusting device 3 via a communication line 4, and communicates with the ventilation amount adjusting device 3 as a slave unit. At this time, the relay device 11 calculates the sum of the air supply amount and the air exhaust amount from the information of the air supply amount and the information of the air exhaust amount from all the connected ventilation devices 2. From this total, for example, when the air supply amount is larger than the exhaust amount, it can be regarded as one ventilation device performing air supply operation corresponding to the difference, and the operation information of this virtual ventilation device The information such as the sum total processed as is transmitted to the ventilation amount adjusting device 3, which is the parent device.

On the other hand, the ventilation device 2 and the ventilation amount adjusting device 3 do not manage the repeater 11 which is a connection partner of the ventilation device 2 as a special device. That is, the ventilation volume adjusting device 3
Recognizes the repeater 11 as one ventilation device, and adjusts its own supply / exhaust amount so as to be a predetermined total supply / exhaust amount according to the supply / exhaust amount. The ventilator 2 does not recognize the repeater 11 or the ventilation amount adjuster 3, and returns a response to an inquirer about the state. If there is a command, it will follow it. In some cases, the ventilation amount adjusting device 3 adjusts the total supply / exhaust amount if the ventilation device 2 managed by itself has a device having a function of changing modes of ventilation amount, air supply, and exhaust operation. I sometimes give instructions to drive. At this time, if the repeater 11 has a performance capable of coping with this function, the repeater 11 having received this command transfers the command to the ventilation device having the above-mentioned performance in the ventilation device 2. Then
It can be adjusted to achieve the desired ventilation.

Therefore, the ventilation device 2 and the ventilation amount adjusting device 3 can be operated without recognizing that the system has been expanded, and the system expansion can be facilitated while maintaining compatibility.

The ventilation system of the maximum number of units that can be assumed in this way can be handled by this repeater 11, and the ventilation rate adjusting device 3 can be designed to have the optimum number of system units, so that the price can be set according to the specifications. It can be realized and an inexpensive and simple system can be provided.

FIG. 8 is a block diagram of the ventilation system. The ventilation system 12 includes, in addition to the configuration of the ventilation system 10 described above, a central control remote controller 13 having a function of monitoring the operation of each ventilation device 2 and remote control, and a function of adjusting the ventilation volume of the ventilation system 12 as a whole. It has a dedicated transmission line 14 that connects the management remote controller 13 and the repeater 11.

The central control remote controller 13 instructs the repeater 11 to transmit information calculated from the information of the ventilation device 2 connected to the repeater device 11 to the target ventilation amount set to the ventilation amount adjusting device 3. To do. In addition, the central control remote controller 13
The remote driving operation is enabled by a transmission command from the device to each ventilation device 2 during baseband communication.

By doing so, the centralized control remote controller 13 can easily carry out the processing of processing the information from the ventilation device 2 in the repeater 11 and the setting of the transmission command for the ventilation device 2, and the centralization of the ventilation system 12 can be performed. Since the operating function itself of the ventilation system 12 including the management function and the ventilation volume adjusting device 3 can be changed by the centralized control remote controller 13, it is easy to provide various systems, and the function can be updated simply by updating the centralized remote control. Therefore, it is possible to provide a system that is highly expandable in the future.

[0044]

As described above, since it is not necessary to previously set the address and the like for each device when transmitting and receiving with a plurality of devices having different transmission modes, it is easy to add and expand in the future. A high system can be provided.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a ventilation system according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram of a transmission circuit according to the first embodiment of the present invention.

FIG. 3 is a flowchart of a communication method of a master unit according to Embodiment 1 of the present invention.

FIG. 4 is a flowchart of a communication method of a monitor output type child device according to the first embodiment of the present invention.

FIG. 5 is a flowchart of the communication method of the baseband type child device according to the first embodiment of the present invention.

FIG. 6 is a diagram showing specifications of monitor output signals.

FIG. 7 is a configuration diagram of a ventilation system according to Embodiment 2 of the present invention.

FIG. 8 is a configuration diagram of a ventilation system according to Embodiment 2 of the present invention.

[Fig. 9] Configuration diagram of a conventional ventilation system

[Explanation of symbols]

1 ventilation system, 2 ventilation device, 3 ventilation amount adjusting device, 4 communication line, 5 transmission circuit, 6 transistor, 7 photo coupler, 8 photo coupler, 9
Diode bridge, 10 ventilation system, 11
Repeater, 12 ventilation system, 13 centralized control remote control, 14 dedicated transmission line.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kaneyoshi Oshima             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. (72) Inventor Naoto Minamikawa             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. (72) Inventor Makino Ara             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. (72) Inventor Takuya Saeki             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. (72) Inventor Koji Kumagai             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. F-term (reference) 3L061 BA05 BA06

Claims (6)

[Claims] 1. A ventilation volume adjusting device that communicates with a ventilation device, wherein transmission of a unidirectional mode from the ventilation device waits until an arbitrary time elapses after a line is connected to the ventilation device, The ventilation amount adjusting device, wherein if there is no transmission in the unidirectional mode before the lapse of the arbitrary time, transmission in a half-duplex mode is performed to the ventilation device. 2. The ventilation adjusting device, if there is no response within an arbitrary time after transmitting the half-duplex mode to the ventilation device,
The ventilation system according to claim 1, wherein it is determined that the ventilation device is stopped. 3. A plurality of ventilation devices having either one of a unidirectional mode transmission device and a half-duplex mode transmission device, and a ventilation volume adjusting device communicating with the ventilation device, A ventilation system for controlling the sum of the air supply volume and the exhaust volume of the plurality of ventilation devices by a ventilation volume adjusting device, wherein the ventilation volume adjusting device transmits the unidirectional mode from the ventilation device to the ventilation volume. Wait until an arbitrary time elapses after the line between the adjusting device and the ventilation device is connected, and if there is no transmission of the unidirectional mode by the elapse of the arbitrary time, the ventilation device is in a half-duplex mode. Ventilation system characterized by transmitting. 4. The ventilation amount adjusting device determines that the ventilation device is stopped if there is no response from the ventilation device that has transmitted the half-duplex mode within an arbitrary time. The ventilation system according to Item 3. 5. A ventilation device having a unidirectional mode transmission means has only an exhaust function or an air supply function, and a ventilation device having a half-duplex mode transmission means has an air supply function and an exhaust function. 3. Both of the above
And the ventilation system according to claim 4. 6. A plurality of ventilation devices, and information on the supply air amount and the exhaust amount of each ventilation device from the plurality of ventilation devices is received, and the sum of the supply air amount and the exhaust amount is calculated. A repeater and a ventilation amount adjusting device for receiving the sum total from the repeater, the ventilation amount adjusting device, if the sum total is not within a predetermined range, the repeater within the range. A ventilation system, characterized in that the relay device changes at least one of an air supply amount and an air discharge amount of the plurality of ventilation devices.