JP2000163681A - Terminal equipment and receiver used for multiplex transmission system, multiplex transmission system using them, and method for preparing correspondence table of terminal equipment used for the system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide terminal equipment etc. used for a multiplex transmission system which has no redundancy for abnormal display, can reduce the traffic of polling responses, and can recognize terminal equipment and a transmission terminal connected to the equipment as one control unit of the system. SOLUTION: Terminal equipment 2 is provided with plural transmission terminals 3 having different addresses assigned. Each transmission terminal 3 can set a peculiar address (terminals 1-) for terminal equipment assigned to the terminal equipment 2 of the terminal 3 and, when a receiver 1 makes polling to the terminal 3 by designating the address of the terminal 3, it returns a preset peculiar address (terminals 1-4) to the receiver 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is installed in an apartment house or a building, and is connected to a fire receiver as a receiver by a multiplex transmission line, using a fire detector as a transmission terminal and a fire relay as a terminal device. The present invention relates to a multiplex transmission system typified by an automatic fire alarm system and the like for improving the address setting of terminal equipment.

[0002]

2. Description of the Related Art Conventionally, in apartment buildings and other apartment buildings, fire detectors have been installed in each dwelling unit, each room, floor, corridor, shared room, etc. An automatic fire alarm system connected to a fire receiver via a multiplex transmission line via a repeater is installed. This automatic fire alarm system can be considered as an example of a multiplex transmission system when a fire detector is a transmission terminal, a fire relay is a terminal device, and a fire receiver is a receiver.

FIGS. 8A and 8B are block diagrams showing an example of such a conventional multiplex transmission system. The multiplex transmission system 50 includes a receiver 5 serving as a core of the system.
1, a terminal device 52 connected to the terminal device 52 by a multiplex transmission line L, and a plurality of transmission terminals 53 connected to the terminal device 52 and having different addresses.

[0004] Usually, as shown in FIG.
1 performs polling by designating an address to the transmission terminal 53, and detects the state of the transmission terminal 53 having that address by reply. At this time, the terminal device 52
Compared with the case where all transmission terminals and receivers are directly connected, in consideration of the improvement of wiring efficiency, the reduction of use control means, the efficiency of interrupt processing, and the like by the distributed installation of the system using the terminal device 52 as a relay point. In this case, the terminal device 52 itself has no address, and has conventionally functioned as a signal relay processing point.

Therefore, in this system, for example, as shown in FIG. 8B, when the wiring of the multiplex transmission line L from the address 21 to the terminal equipment 2 connected to the transmission terminal 3 of the address 30 is shifted, For the polling of the receiver 51, all the addresses 21 to 30
No response was sent from the transmission terminal 3 and the receiver displayed a transmission error for all the transmission terminals 3.

However, in this case, the abnormal display becomes redundant, and the multiplex transmission line L is occupied at the time of reply by the number of addresses, and there is a problem in terms of traffic efficiency. That is, in this system, although one control unit is formed with each terminal device 2 as a relay point, this control unit cannot be grasped as one unit.

[0007]

SUMMARY OF THE INVENTION The present invention solves such a problem and eliminates the redundancy of abnormal display, reduces the traffic of polling replies, and allows a terminal device and a transmission terminal connected thereto to be connected to a system. It is an object of the present invention to provide a terminal device and a receiver used in a multiplex transmission system that can be grasped as one of the control units, a multiplex transmission system using the same, and a method of creating a correspondence table for terminal devices used in this system.

[0008]

According to a first aspect of the present invention, there is provided a terminal device for use in a multiplex transmission system, the terminal device comprising a plurality of transmission terminals each having a different address assigned thereto. In each of the transmission terminals, a unique terminal device address assigned to the terminal device to which each belongs can be set, and when the receiver specifies the address of each transmission terminal and is polled, it is set in advance. And a unique terminal device address.

[0009] Here, the term "terminal equipment" refers to a device having a plurality of transmission terminals, each of which is assigned a different address, such as a relay point of a multiplex transmission system.
This applies to fire relays in automatic fire alarm systems. Transmission terminals are those that have different addresses and constitute the terminal of this system, for example, those that are provided corresponding to a fire monitoring line to which a fire detector or the like of an automatic fire alarm system is connected. Is applicable.

[0010] This terminal device is characterized in that a unique terminal device address assigned to the terminal device to which the terminal belongs can be set for each of the transmission terminals, and the terminal device address is returned in response to polling. ing. By doing so, the receiver that has received this reply can determine that the transmission terminal that has sent the reply with the terminal device address belongs to that terminal device, so that the reply information can be determined for each terminal device. Can be processed. Therefore, for common reply information, for example, abnormality information, abnormality display can be performed for each terminal device, and the display redundancy can be eliminated.

According to a second aspect of the present invention, there is provided a terminal device for use in a multiplex transmission system, wherein the terminal device includes a plurality of transmission terminals each assigned a different address. And a multiplex transmission control unit for transmitting and receiving multiplex transmissions to and from an associated transmission terminal, and a unique terminal device address can be set. The receiver specifies the address of the associated transmission terminal from the receiver. When the polling is performed, the unique terminal device address is added to the reply signal to be returned.

In this terminal device, the unique terminal device address is automatically added to the reply signal from the transmission terminal on the terminal device side. Also in this case, as in claim 1, the reply information can be processed on a terminal device basis, so that for common reply information, for example, abnormal information, an abnormal display can be performed on a terminal device basis. Can be eliminated.

Further, since it is not necessary to provide a means for adding a terminal device address to each of the transmission terminals, it is possible to easily cope with the problem and to reduce the cost. A receiver used in the multiplex transmission system according to the third aspect is characterized in that when a reply is received from the terminal device according to any one of the first and second aspects, an abnormality is displayed on a terminal device basis.

This receiver grasps the reply information for each terminal device in correspondence with the terminal device according to claim 1 or 2,
An error display can be made. Therefore,
For common reply information, for example, abnormality information, abnormality display can be performed for each terminal device, and display redundancy can be eliminated. A multiplex transmission system according to a fourth aspect is a multiplex transmission system in which the terminal device according to any one of the first and second aspects and the receiver according to the third aspect are connected by a multiplex transmission line. In the above receiver, when polling each transmission terminal, the unique address of the terminal device returned is received, and a correspondence table relating the terminal device and the transmission terminal can be automatically created. It is characterized by the following.

In this system, since the terminal device according to the first and second aspects and the receiver according to the third aspect are combined, the respective effects are synergistically exhibited, and the terminal device is associated with the transmission terminal. Since the correspondence table is automatically created, the correspondence table allows the system of each terminal device to be grasped more smoothly. By creating such a correspondence table in advance, for example,
It is possible to reduce the trouble when creating the interlocking table of the automatic fire alarm system.

According to a fifth aspect of the present invention, there is provided a terminal device for use in a multiplex transmission system, wherein the terminal device comprises a plurality of transmission terminals each having a different address. And a multiplex transmission control unit for transmitting and receiving multiplex transmissions to and from the transmission terminal to which the multiplex transmission control unit belongs. Therefore, when an abnormality common to all the transmission terminals is detected, only the transmission terminal to which the head code is added is returned to the receiver.

This terminal device includes a multiplex transmission control unit,
For errors that are common within the same terminal device, such as a power supply error, a reply is made with a head code added only to the reply from the head transmission terminal, so only the reply signal is returned to the receiver, and the reply The traffic is reduced, and the receiver judges the abnormalities of each terminal device by the return signal,
The display can be performed, and the redundancy of the display can be reduced.

[0018] In addition, since the head code only needs to increase the data returned to identify the terminal device by one bit, the amount of information does not increase. The receiver used in the multiplex transmission system according to claim 6, when receiving a reply from the terminal device according to claim 5, uses the address of the transmission terminal added with the leading code as the address of the terminal device. It is characterized in that abnormal display is performed for each terminal device.

When the receiver receives a reply from the transmission terminal to which the leading code is added, the receiver determines the terminal device to which the transmission terminal is connected based on the address of the transmission terminal, and displays an abnormality display for each terminal device. Is performed, the display redundancy can be reduced. The multiplex transmission system according to claim 7,
A multiplex transmission system in which the terminal device according to claim 5 and the receiver according to claim 6 are connected by a multiplex transmission line,
In the receiver, when polling each transmission terminal, the address of the transmission terminal returned is received, and a correspondence table that associates the terminal device with the transmission terminal can be automatically created. Features.

This system combines the terminal device of claim 5 and the receiver of claim 6 in the same manner as in claim 4, so that the respective effects are synergistically exhibited.
Since the correspondence table in which the terminal devices and the transmission terminals are associated with each other is automatically created, the correspondence table allows the system of the terminal device to be grasped more smoothly.

In the multiplex transmission system according to the present invention, the terminal equipment is a fire relay, and each transmission terminal is connected to a fire monitoring line to which a fire detector is connected. It is characterized by being provided correspondingly. In this system, the multiplex transmission system of claim 4 or 7 is specifically applied to an automatic fire alarm system.
The effect of claim 4 or 7 is exhibited.

According to a ninth aspect of the present invention, there is provided a terminal device correspondence table creating method comprising connecting a terminal device having a plurality of transmission terminals, each of which is assigned a different sequential number address, to a receiver through a multiplex transmission line. A method of automatically assigning a unique address to a terminal device and creating a correspondence table by using the multiplexed transmission system, wherein when the transmission terminal is sequentially polled by designating the address from the receiver, The terminal device assigns the first code only to the reply from the first transmission terminal and sends the reply.On the other hand, the receiver changes the address to be assigned to the terminal device in ascending or descending order each time the first code is received. Thus, a unique address is automatically assigned to the terminal device, and a correspondence table is created.

According to this table creation method, the correspondence table between the terminal device and the transmission terminal connected to the terminal device is created based on the leading code as a criterion. It can be grasped for each device, and system resources can be used effectively. At this time, a method of increasing a certain numerical value from 0 or 1 is possible as an ascending order, and a method of decreasing a certain numerical value from a predetermined value is possible as a descending order.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an example of a multiplex transmission system according to the present invention. The multiplex transmission system 10 includes a receiver 1 at the core of the system.
And a plurality of terminal devices 2 connected to the receiver 1 via a multiplex transmission line L, and a plurality of transmission terminals 3 connected to the terminal device 2 and having different addresses, addresses 1 to 30, respectively. .

The transmission terminals 3 have addresses 1 to 1, respectively.
Group of transmission terminals 3 having up to 0, addresses 11 to
20, transmission terminals 3 each having an address 21-25 and an address 25-30,
Each is connected to the terminal device 2 in a group unit.
Note that such grouping is similar to the following:
It is shown as an example, and is not limited to this.

The multiplex transmission system 10 is characterized in that each of the transmission terminals 3 is further provided with an address of a terminal device to which it is connected and terminals 1 to 4 as shown in the figure. 3 is configured to return this terminal device address when polling is received from the receiver 1. When receiving such a reply signal, the receiver 1 polls the transmission terminal 3 by designating the address.
Can be determined to belong to the terminal device 2 having the terminal device address, and the terminal device 2 and the transmission terminal 3 connected thereto are determined as one unit or group to determine, process, and display reply information. And so on.

For example, assuming that a line shift as described with reference to FIG. 8B of the prior art has occurred in a group of transmission terminals having addresses 26 to 30, a terminal address “terminal 4” is obtained from a correspondence table described later. It is determined that a transmission error has occurred in the group, and the transmission error is displayed only for the terminal device having the terminal address “terminal 4”. Therefore, the redundancy of the abnormal display can be eliminated.

FIGS. 2A and 2B are block diagrams of another example of the multiplex transmission system according to the present invention. Therefore, the same portions are denoted by the same reference numerals, and redundant description will be omitted. In this multiplex transmission system 10A, individual transmission terminals 3 are compared with the multiplex transmission system 10 of FIG.
Is the address unique to the transmission terminal 3 and the address 1
The terminal device 2 includes a multiplex transmission control unit 21 for performing transmission and reception of multiplex transmission between the receiver 1 and the transmission terminal 3 to which the terminal device 2 belongs, and can set a unique terminal device address. The points are different.

The multiplex transmission control unit 21 adds the unique terminal device address to the reply signal from the transmission terminal 3 when polling is performed from the receiver 1 by specifying the address of the transmission terminal 3 to which the receiver 1 belongs. To the receiver 1. For example, when the receiver 1 polls the transmission terminals at the addresses 9, 10, and 11, the terminal device 1 with the terminal device address “terminal 1” receives a reply from the transmission terminal 3 at the addresses 9 and 10, A “terminal 1” is added, and a reply signal is returned to the receiver 1. Terminal device address "Terminal 2"
The terminal device 1 of “1” returns the reply from the transmission terminal 3 of the address 11 with “terminal 2” added.

As a result, as a result, the receiver 1 receives a return signal similar to that of the multiplex transmission system 10, and can exert the same effect. Further, in this case, unlike the multiplex transmission system 10, the transmission terminal 3
In addition, since it is not necessary to provide a means for adding a terminal device address, it is easy to cope with the problem and cost can be reduced.

FIG. 3 is a block diagram showing an example in which the multiplex transmission system according to the present invention is applied to an automatic fire alarm system. The creation of the correspondence table will be described with reference to FIG. The automatic fire alarm system 11 is obtained by applying the multiplex transmission system described above to a fire alarm system.

The automatic fire alarm system 11 sends various types of transmission terminals 3a to 3e to a fire receiver 1A serving as a receiver via a multiplex transmission line L via a fire relay 2A serving as a terminal device. Are connected. here,
The transmission terminal 3a includes a fire monitoring line to which a fire detector is connected,
The transmission terminal 3b is connected to a gas detector, and the transmission terminal 3
c is a device connected to various alarm devices for detecting a drop in the water level of the fire prevention water tank, etc., the transmission terminal 3d is a device connected to a smoke prevention device such as a fire door or a damper, and the transmission terminal 3e is a device such as a district bell. A disaster prevention terminal is connected.

The fire receiver 1A is constituted by a CPU and the like, a signal processing unit 11 for controlling the fire receiver 1A, an operation unit 12 constituted by various switches such as various fire recovery buttons and line selection switches, and an address. The display unit 13 includes a display unit 13 for displaying an attached abnormality, a storage unit 14 for storing and storing the created correspondence table, and a transmission control unit 15 for controlling multiplex transmission through the multiplex transmission line L.

The fire relay system 2 of the fire alarm system 11
A and the transmission terminals 3a to 3e are configured by any of the multiplex transmission systems 10 and 10A described above. Therefore, in any case, when the fire receiver 1A performs polling by designating the address of each of the transmission terminals 3a to 3e, the terminal device address of the fire relay 2A to which it is connected is added. , A reply signal is returned.

Therefore, in the fire receiver 11, the terminal device address and the transmission terminals 3a-3
The correspondence between the address e and the address is determined by the signal processing unit 11.
It can be created as a correspondence table, and the result can be stored and stored in the storage unit 14 for use. FIG. 4A,
(B) is a diagram showing an example of the correspondence table created in this way.

FIG. 4 (a) shows each of the fire relay 2A and the transmission terminals 3a to 3e of the fire alarm system 11 as shown in FIG.
A correspondence table in the case where addresses such as
FIG. 4B is an example of a correspondence table in a case where addresses as shown in FIG. 2A are assigned to the respective fire relays 2A and the transmission terminals 3a to 3e of the fire alarm system 11.

As described above, the correspondence table is automatically created, which is convenient. If such a correspondence table is created, it is possible to smoothly grasp the system for each terminal device by using the correspondence table. . By creating such a correspondence table in advance, for example, the transmission terminal 3d of the automatic fire alarm system 11
Interlocking with smoke prevention equipment such as fire doors and dampers, transmission terminals 3
The effort and the like at the time of creating an interlock table for interlocking the disaster prevention terminals such as the district bell in e can be reduced.

FIGS. 5A and 5B are block diagrams showing still another example of the multiplex transmission system according to the present invention. The multiplex transmission system 10B shown in FIG.
Similarly to the above, the terminal device 2 includes a multiplex transmission control unit 21A that performs transmission and reception of multiplex transmission between the receiver and the transmission terminal to which the terminal device 2 belongs, and the head code A can be set in the head transmission terminal 3. It has been.

The multiplex transmission control unit 21 A
When an abnormality common to all the transmission terminals 3, for example, power interruption is detected, only the transmission terminal 2 to which the leading code A is added is returned to the receiver 1. Therefore, only the reply signal is returned to the receiver 1 and the traffic of the reply is reduced, and the receiver 1 can determine and display an abnormality of the terminal device 2 unit by the reply signal, Redundancy of display can be reduced.

In addition, since the head code A has only to be increased by 1 bit in the data returned to identify the terminal device, the amount of information does not increase. FIG. 6 is a flowchart showing an example of creating a correspondence table in such a multiplex transmission system according to the present invention. The configuration of the receiver in this case is the same as that of the fire receiver 1A described with reference to FIG. Therefore, description will be made using the same terms as those in FIG. 3 as necessary with reference to FIG.

When creating the correspondence table, first, the receiver 1
Then, the transmission terminal address and the terminal device address are set to predetermined initial values, for example, 0, respectively (Step S)
1). Next, the receiver 1 sets the transmission terminal address to “1”.
(Step S2), and polls the transmission terminal 3 (step S3). When the transmission terminal 3 having the address 1 sends a reply signal, the transmission signal is transmitted to the terminal equipment 2 connected thereto.
(Step S4).

In response to this, the terminal equipment 2 determines whether or not the transmission terminal 3 is the first one (step S5), and attaches a 1-bit head code only when the transmission terminal 3 is the first one (step S6). Otherwise, a reply signal from the transmission terminal 3 is returned to the receiver 1 without adding a head code (step S7). The receiver 1 receiving this reply signal determines whether or not the reply signal has a head code (step S8). If there is, the terminal device address is counted up (in this case, the terminal device address = 1). Step S9) If not, the terminal device address in this state and the transmission terminal address are written to the correspondence table without counting up (step S10).
In the case of FIG. 5B, the terminal device address = 1 and the transmission terminal address = 1 are written.

This is repeated in order, and it is determined whether or not the transmission terminal address is the address of the last transmission terminal connected to the system (in this case, transmission terminal address = 30, step S11). Then, the correspondence table creation ends. FIG. 7 is a diagram showing the correspondence table created in this way. Looking at this correspondence table, it can be seen that the relationship between the terminal device 2 and the transmission terminal 3 in FIG. 5B is reproduced.

[0044]

According to the terminal device used in the multiplex transmission system according to the first aspect, a unique terminal device address assigned to the terminal device to which the terminal belongs can be set for each of the transmission terminals. Since the terminal device address is returned, the receiver that has received the reply can determine that the transmission terminal that has returned with the terminal device address attached thereto belongs to the terminal device. Reply information can be processed on a terminal device basis. Therefore, for common reply information, for example, abnormal information,
Abnormal display can be performed for each terminal device, and display redundancy can be eliminated.

According to the terminal device used in the multiplex transmission system according to the second aspect, the terminal device address is automatically added to the reply signal from the transmission terminal on the terminal device side. As in the case of item 1, the reply information can be processed on a terminal device basis, so that common reply information, for example, abnormal information, can be displayed on a terminal device basis, thereby eliminating display redundancy. can do.

Further, since it is not necessary to provide a means for adding a terminal device address to each of the transmission terminals, it is easy to cope with the problem and the cost can be reduced. According to the receiver for use in the multiplex transmission system according to the third aspect, the reply information can be grasped and an abnormal display can be made for each terminal device corresponding to the terminal device according to the first or second aspect. For common reply information, for example, abnormality information, abnormality display can be performed for each terminal device, and display redundancy can be eliminated.

According to the multiplex transmission system of the fourth aspect, since the terminal equipment of the first and second aspects and the receiver of the third aspect are combined, the respective effects are synergistically exhibited. Since the correspondence table in which the terminal devices and the transmission terminals are associated with each other is automatically created, the correspondence table allows the system of the terminal device to be grasped more smoothly.

Further, by preparing such a correspondence table in advance, for example, it is possible to reduce the trouble and the like when creating the interlocking table of the automatic fire alarm system. According to the terminal device used in the multiplex transmission system according to claim 5, a multiplex transmission control unit is provided, and for a common abnormality in the same terminal device such as a power supply abnormality, only a reply from the first transmission terminal is returned. Since the reply is made with the leading code added, only the reply signal is returned to the receiver, and the reply traffic is reduced. At the same time, the receiver judges and displays abnormalities for each terminal device based on the reply signal. And the redundancy of the display can be reduced.

In addition, the head code only needs to increase the data returned for identifying the terminal device by one bit, so that the information amount does not increase. According to the receiver for use in the multiplex transmission system according to claim 6, when a reply from the transmission terminal added with the leading code is received, the terminal device to which it is connected is determined based on the address of the transmission terminal. Since the abnormal display is performed for each terminal device, the display redundancy can be reduced.

According to the multiplex transmission system of the seventh aspect, since the terminal equipment of the fifth aspect and the receiver of the sixth aspect are combined, the respective effects are exhibited synergistically, and A correspondence table that automatically associates the transmission terminal with the transmission terminal is automatically created, so that the correspondence table allows the system of each terminal device to be grasped more smoothly.

According to the multiplex transmission system of the eighth aspect, the multiplex transmission system of the fourth or seventh aspect is specifically applied to an automatic fire alarm system.
Or the effect of 7 is exhibited. According to the terminal device correspondence table creation method according to the ninth aspect, the correspondence table between the terminal device and the transmission terminal connected thereto is created based on the leading code as a criterion, so that a specific code is assigned to the terminal device. Instead, the correspondence table allows the system to be grasped for each terminal device, and system resources can be used effectively.

[Brief description of the drawings]

FIG. 1 is a block diagram of an example of a multiplex transmission system according to the present invention.

FIGS. 2A and 2B are block diagrams of another example of the multiplex transmission system according to the present invention.

FIG. 3 is a block diagram showing an example in which the multiplex transmission system according to the present invention is applied to an automatic fire alarm system.

FIGS. 4A and 4B are diagrams showing examples of a correspondence table; FIGS.

FIGS. 5A and 5B are block diagrams of still another example of the multiplex transmission system according to the present invention.

FIG. 6 is a flowchart showing an example of creating a correspondence table in the multiplex transmission system according to the present invention.

FIG. 7 is a diagram showing another example of the correspondence table.

FIG. 8 is a block diagram of an example of a conventional multiplex transmission system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Receiver 2 Terminal equipment 21, 21A Multiplex transmission control part 3 Transmission terminal 10-10B Multiplex transmission system 11 Automatic fire alarm system

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)

Claims (9)

[Claims] 1. A terminal device used in a multiplex transmission system and provided with a plurality of transmission terminals each assigned a different address, wherein each of said transmission terminals is a unique terminal device assigned to a terminal device to which each belongs. A terminal device used in a multiplex transmission system configured to be able to set a terminal address and to return a preset unique terminal device address when polling is performed by designating the address of each transmission terminal from a receiver. 2. A terminal device used in a multiplex transmission system and provided with a plurality of transmission terminals to which different addresses are assigned, wherein the terminal device transmits and receives multiplex transmission between a receiver and a transmission terminal to which the receiver belongs. And a unique terminal device address can be set.When polling is performed from the receiver by specifying the address of the transmission terminal to which the receiver belongs, the unique terminal device address can be set. A terminal device used in a multiplex transmission system, wherein an address is added to a reply signal to cause a reply. 3. A receiver for use in a multiplex transmission system, wherein when a reply is received from the terminal device according to any one of claims 1 and 2, an error is displayed on a terminal device basis. 4. A multiplex transmission system in which the terminal device according to claim 1 and the receiver according to claim 3 are connected by a multiplex transmission line, wherein the receiver comprises: Multiplexing characterized by receiving a unique address of a terminal device returned when polling each transmission terminal and automatically creating a correspondence table relating terminal devices and transmission terminals. Transmission system. 5. A terminal device used in a multiplex transmission system and provided with a plurality of transmission terminals each having a different address, wherein the terminal device transmits and receives multiplex transmission between a receiver and a transmission terminal belonging thereto. And a multiplex transmission control unit that performs the following functions.The first transmission terminal is configured to be able to set the first code.The multiplex transmission control unit detects an error common to all transmission terminals in the terminal equipment. A terminal device for use in a multiplex transmission system, characterized in that, when a head code is added, only a transmission terminal to which a head code is added is returned to a receiver. 6. When a reply is received from the terminal device according to claim 5, an abnormality display is performed for each terminal device using the address of the transmission terminal added with the leading code as the address of the terminal device. A receiver used for the multiplex transmission system that is the feature. 7. A multiplex transmission system in which the terminal device according to claim 5 and the receiver according to claim 6 are connected by a multiplex transmission line, wherein the receiver polls each transmission terminal. Receiving an address of the transmission terminal returned, and automatically creating a correspondence table in which terminal devices and transmission terminals are associated with each other. 8. The apparatus according to claim 4, wherein said terminal equipment is a fire relay, and each transmission terminal is provided corresponding to a fire monitoring line to which a fire detector is connected. Characteristic multiplex transmission system. 9. A multiplex transmission system configured by connecting a plurality of transmission terminals each assigned a different sequential number address to a receiver through a multiplex transmission line, and using a multiplex transmission system constituted by the multiplex transmission system. This is a method of automatically assigning addresses and creating a correspondence table, in which when an address is specified from a receiver and transmission terminals are sequentially polled, each terminal device only responds from the first transmission terminal. Each time the receiver receives the head code, the receiver changes the address to be assigned to the terminal equipment in ascending or descending order, thereby automatically assigning a unique address to the terminal equipment. And creating a correspondence table for the terminal device.