JP3173959B2 - Local area network device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a local area network (Local Area Network) in which a plurality of terminals are connected to a monitoring device via a transmission line by a multi-drop method.
Area Network (LAN) devices, and in particular, CSMA / CD (Carrier Sense) as an access control method.
Multiple Access with Collision Detection) L
The present invention is preferably applied to an AN and relates to an address setting technique of a terminal in the LAN.

[0002]

2. Description of the Related Art FIG. 5 shows an L which is composed of a plurality of terminals connected to a monitoring apparatus by a multi-drop system via a transmission line.
FIG. 2 is a configuration diagram illustrating an AN device. In FIG. 5, reference numeral 1 denotes a monitoring device, 2 denotes a transmission line, and 3 denotes a plurality of terminals connected to the monitoring device 1 via the transmission line 2 in a multi-drop manner to obtain sensor information such as crime prevention and disaster prevention. , FIG.
As shown in (a), the address is “1” from the monitoring device 1 side.
Terminal devices 3 of “01”, “102”, “201”, and “202” are sequentially connected via the transmission line 2.

Conventionally, in such a LAN device, when an additional terminal 3 is added, the address setting of the additional terminal is as follows.
For example, as shown in Japanese Patent Application Laid-Open No. 6-195582, the address of the terminal 3 to be added to the monitoring device 1 is set and registered in advance, and when the terminal 3 is added, the terminal 3 The address is transmitted from the monitoring device 1 to the added terminal 3 based on the address request.

[0004]

However, in such an address setting method, the address cannot be set freely when the terminal 3 is added, and the monitoring device 1
It is necessary to set and register the address of the additional terminal in advance, and it is necessary to transmit the address from the monitoring device 1 to the terminal 3 when the terminal 3 is added. For this reason, the address of the extension terminal 3 can be set only in the address set and registered in advance in the monitoring device 1, so that the CSMA /
In a multi-drop type local network such as a CD, the degree of freedom in adding and relocating the terminal 3 is high, and the addition and relocation of the terminal 3 are frequently performed. It's getting harder to manage.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is not necessary to set an address in a monitoring device in advance, and it is possible to cope with free extension and relocation of terminals. It is an object of the present invention to provide a local area network device capable of setting an address that can easily manage the connection status of a terminal.

[0006]

According to the present invention, there is provided a local area network apparatus comprising a plurality of terminals connected to a monitoring apparatus by a multi-drop system via a transmission line. And control means for inquiring the address of each adjacent terminal to each of the adjacent terminals and notifying the address of the adjacent terminal returned to the monitoring device, and corresponding to the serial number indicating the position of the storage area of the address in the monitoring device. Then each
A terminal address data table that stores an address indicating the location of the terminal, and the address of the inserted terminal based on the address of the adjacent terminal notified from the terminal inserted between the terminals. Control means for notifying the assignment insertion terminal and storing the address in the terminal address data table.

A local area network device according to another invention is a local area network device in which a plurality of terminals are connected to a monitoring device via a transmission line by a multi-drop method.
The serial number indicating the location of the storage area of the address itself in the monitoring device
A terminal address data table storing the addresses of the terminals at the positions of the serial numbers so as to indicate the positions at which the terminals are sequentially arranged, and a terminal inserted between the terminals. In response to an address setting inquiry from the terminal, the address of the insertion terminal is set with reference to the address stored in the terminal address data table, the address is notified to the insertion terminal, and the address is stored in the terminal address data table. And control means.

When a new terminal is inserted between the terminals, the control means of the monitoring device updates the serial number, which is a storage area of the terminal following the inserted terminal, in the terminal address data table. Then, the addresses of all subsequent terminals are transferred to and stored in the updated serial number position.

Further, the control means of each terminal notifies the monitoring device of its own station address before the transfer at the time of relocation, and the control means of the monitoring device receives the notification from the relocation terminal before the relocation. Updating the serial numbers of all the terminals following the terminal before the relocation in the terminal address data table based on the address and transferring and storing the addresses of all the subsequent terminals at the updated serial number position. It is a feature.

[0010]

In the local area network device according to the present invention, each terminal is provided with control means for inquiring the address of each adjacent terminal and notifying the monitoring device of the address of the adjacent terminal returned, In the above monitoring device, a serial number indicating the location of the address storage area
Corresponding to the terminal address data table storing the address indicating the arrangement position of each terminal and the address of the adjacent terminal notified from the terminal inserted between the terminals. Control means for allocating the address of the insertion terminal based on the notification and notifying the insertion terminal and storing the address in the terminal address data table. Address setting according to the connection status of the terminal can be automatically performed in response to the free extension and relocation of the terminal, and the accuracy of address management is improved.

In the local area network device according to another invention, the monitoring device stores the address.
Terminals are ordered from the monitoring device to the serial number itself indicating the location of the area.
A terminal address data table in which the addresses of the respective terminals are stored at the positions of the serial numbers so as to indicate the positions to be arranged next, and an address setting inquiry from a terminal inserted between the terminals is performed. Control means for setting the address of the insertion terminal by referring to the address stored in the terminal address data table, notifying the insertion terminal, and storing the address in the terminal address data table. In the terminal address data table, the serial number indicating the address storage position indicates the position where the terminal is sequentially arranged from the monitoring device side, so that the connection status of the terminal is determined by the serial number regardless of the addition and relocation of the terminal. The address can be easily obtained, the address can be set freely, and the accuracy of address management is improved.

When a new terminal is inserted between the terminals, the control means of the monitoring device updates the serial number in the storage area of the terminal following the inserted terminal in the terminal address data table. By transferring and storing the addresses of all subsequent terminals to the updated serial number position, address management corresponding to the addition of terminals can be performed.

Further, the control means of each of the terminals notifies the monitoring device of the own station address before the transfer at the time of relocation, and the control means of the monitoring device notifies the control unit of the monitoring device from the relocation terminal before the relocation. By updating the serial numbers of all the terminals subsequent to the terminal before the relocation in the terminal address data table based on the address and transferring and storing the addresses of all the subsequent terminals at the updated serial number position, Address management corresponding to the relocation of a terminal can be performed.

[0014]

【Example】

Embodiment 1 FIG. FIG. 1 is a conceptual diagram illustrating a local area network device according to the first embodiment. In FIG. 1, reference numeral 1 denotes a monitoring device, 2 denotes a transmission line, and 3 denotes a terminal connected to the transmission line 2 of the monitoring device 1 in a multi-drop manner. The monitoring device 1 includes a CPU 10, various data and a control program. A storage unit 11 having a terminal address data table to be described later, a display unit 12 for displaying a control calculation result by the CPU 10, an input / output unit 13 for an external device, and the terminal 3 via the transmission line 2. A communication control device 14 is provided for performing communication control by being connected.

The terminal 3 includes a CPU 30, a storage unit 31 storing various data and a control program, and a display unit 3 for displaying a control calculation result by the CPU 30.
2. A sensor interface 33 for obtaining sensor information, a communication control device 34 connected to the transmission line 2 via a switching unit to be described later to perform communication control, and the CPU
A switching unit 35 controlled by the CPU 30 to switch and connect the communication control unit 34 to the left-side transmission line 2a or the right-side transmission line 2b is provided. In the state, both the left-side transmission line 2a and the right-side transmission line 2b are connected to the communication control unit 34. When a new terminal 3 is inserted between terminals, the left-side transmission line 3a and the right-side The transmission line 3b is cut off and turned ON / OFF when the address of the extension terminal is set, so that the left adjacent transmission line 2a or right adjacent transmission line 2b is alternately connected to the communication control unit 34. The other terminals have the same configuration as the configuration shown in FIG.

Here, in the connection configuration of a plurality of terminals 3 to which addresses shown in FIG. 5A are set, FIG.
As shown in (1), the address setting of an additional terminal when a new terminal 3 is added between terminals 3 having addresses "102" and "201" will be described. Now, in the state before the addition of the terminal 3 shown in FIG. 5A, the contents are stored in the terminal address data table provided in the storage unit 11 of the monitoring device 1 as shown in FIG. Have been. That is, in the terminal address data table, the serial numbers “1, 2, 3, 4,.
Of the terminal device 3 corresponding to “101, 10
, 2, 201, 202,... ", And the connection status of the terminal 3 can be managed by this address. In this case, of the three-digit address, for example, the highest digit is a floor, and the last two digits are a serial number for each floor, so that the location of the terminal can be identified by the address.

In such a connection state of the terminal 3, FIG.
As shown in (b), the addresses are “102” and “20”.
In the case where a new terminal 3 is added between the terminal 3 and “1”, the address setting of the additional terminal 3 is performed by the CPU 3 in the terminal 3.
The control by the CPU 0 in the monitoring apparatus 1 and the control by the CPU 10 in the monitoring apparatus 1 will be described with reference to a flowchart shown in FIG.
In FIG. 3, steps S101 to S101 are executed.
Steps up to 105 indicate control by the CPU 30 in the extension terminal 3, and steps S106 and S107 indicate control by the CPU 10 in the monitoring device 1. Also, the reference sign and its control contents of step S shown in FIG. 3 and the reference sign of step S and its control contents shown in FIG.

First, the CPU 30 of the extension terminal 3 controls the switching unit 35 to connect the left-side transmission line 3a and disconnect the right-side transmission line 3b, and to disconnect the left-side transmission line 3b from the left-side transmission line 3b having the address "102". The terminal 3 is inquired about the address (step S101). Based on this, the terminal 3 on the left
Returns the own station address (# 102), so that the extension terminal 3 stores the address of the terminal on the left side to which the reply has been made to the storage unit 31.
(Step S102).

Next, on the contrary, the CP of the extension terminal 3 is
U30 controls the switching unit 35 to disconnect the left side transmission line 3a side and connect the right side transmission line 3b side, and the address is “20”.
An address inquiry is made to the terminal 3 on the right, which is "1" (step S103). On the basis of this, the terminal 3 on the right side replies its own station address (# 201), so the extension terminal 3 stores the returned address of the terminal on the right side in the storage unit 31 (step S104). .

In this way, the extension terminal 3 can know the addresses of the left and right neighbor terminals, and the CPU 30 of the extension terminal 3 next controls the switching unit 15 to The transmission line 3a and the right transmission line 3b are connected. Then, it notifies the monitoring device 1 via the communication control unit 34 and the switching unit 35 that the address of the terminal on the left is “102” and the address of the terminal on the right is “201” (step S105).

On the other hand, the CPU 10 of the monitoring device 1 assigns an address to the extension terminal 3 based on the notification of the address of the left terminal and the right terminal from the extension terminal 3.
In this case, the extension terminal 3 is disposed next to the left terminal having the address “102” and is disposed before the right terminal having the address “201”. "103" is assigned as the address of the third terminal 3 and the address is notified to the extension terminal 3 (step S10).
6). The extension terminal 3 sends the notified own station address “10
3 ”is stored in the storage unit 31.

Next, the CPU 10 of the monitoring device 1 updates the contents of the terminal address data table provided in the storage unit 10 as shown in FIG. 2B (step S107).
That is, the extension terminal 3 to which "103" is assigned as the address is shown in FIG.
In (a), the address “1” is assigned to the area with the serial number “2”.
2 (b) is located next to the terminal on the left side, which is set at “02”, and is located before the terminal on the right side having the address “201” in the area with the serial number “3”. ), The address “103” of the extension terminal 3 is stored in the area with the serial number “3”, and the addresses “201”, “202”,. The serial numbers are transferred so that they are stored in areas of serial numbers “4”, “5”,.

As described above, according to the above embodiment, the location of the terminal is indicated in the address itself, and the extension is performed by referring to the addresses set in the left and right adjacent terminals at the time of extension. Since the address of the terminal 3 is automatically assigned, there is no need to set the address in the monitoring device 1 in advance, and the address setting according to the connection status of the terminal is automatically performed in response to the free extension of the terminal. In addition to this, the management of the connection status of the terminal can be easily performed, the terminal can be freely added and relocated, and the accuracy of address management is improved.

Embodiment 2 FIG. Next, FIG. 4 is a flowchart showing the control by the CPU 30 in the terminal 3 and the control by the CPU 10 in the monitoring device 1 relating to the address setting when the terminal 3 is relocated. When the terminal 3 is relocated, the own station address before the relocation is notified to the monitoring device 1 (step S2).
01), based on this, the CPU 10 of the monitoring device 1
The serial numbers of all the terminals 3 subsequent to the terminal before the relocation in the terminal address data table are updated, and the addresses of all the subsequent terminals are transferred and stored at the updated positions of the serial numbers (step S202). After these steps, a step S10 similar to the flowchart shown in FIG.
The address management corresponding to the relocation of the terminal can be performed by performing the address setting of the relocation terminal and the updating of the terminal address data table by the transfer of the serial number and the address of the subsequent terminal through 1 to S107.
When the terminal is relocated, in FIG. 4, after step S202, in the flowchart shown in FIG. 3, the notation of the extension terminal is simply replaced with the relocation terminal, and the same processing is performed.

Embodiment 3 FIG. In each of the above embodiments,
The serial number indicating the address storage position of the terminal address data table indicates the position where the terminal 3 is sequentially arranged from the monitoring device 1 side, so that the terminal can be serially numbered regardless of the extension or relocation of the terminal 3. This makes it possible to easily know the connection status of the device, to perform free address setting, and to improve the accuracy of address management. In particular, in this case, when a terminal is added or relocated, the address of the terminal is set to an address not set in the terminal address data table without referring to the address of the adjacent terminal. Free setting of the address can be performed.

[0026]

As described above, according to the present invention, each terminal is provided with control means for inquiring the address of the adjacent terminal and informing the monitoring device of the address of the returned adjacent terminal, to the monitoring apparatus, the address
Location of each terminal according to the serial number indicating the location of the storage area
And a terminal address data table storing an address indicating the position of the terminal, and allocating the address of the insertion terminal based on the address of the adjacent terminal notified from the terminal inserted between the terminals. And the control means for notifying the address and storing the address in the terminal address data table eliminates the need to set an address in the monitoring device in advance. There is an effect that the address setting according to the connection status of the device can be automatically performed and the accuracy of the address management is improved.

Further, according to another aspect of the present invention, the monitoring device, A
The serial number indicating the location of the storage area of the dress itself
A terminal address data table in which the addresses of the terminals are respectively stored at the positions of the serial numbers so as to indicate the positions where the terminals are sequentially arranged, and a terminal inserted between the terminals. In response to an address setting inquiry from the terminal, the address of the insertion terminal is set by referring to the address stored in the terminal address data table, the address is notified to the insertion terminal, and the address is stored in the terminal address data table. Control means for causing the monitoring device to sequentially indicate the position at which the terminal is sequentially arranged from the monitoring device side, so that the serial number indicating the address storage position of the terminal address data table can be used regardless of extension and relocation of the terminal. The connection status of the terminal can be easily known by the serial number, the address can be set freely, and the accuracy of address management is improved. There is an effect of.

When a new terminal is inserted between the terminals, the control means of the monitoring device updates the serial number which is a storage area of the terminal following the inserted terminal in the terminal address data table. By transferring and storing the addresses of all subsequent terminals to the updated serial number position, there is an effect that address management corresponding to the addition of terminals can be performed.

Further, at the time of relocation, the control means of each terminal notifies the monitoring device of its own address before the relocation, and the control means of the monitoring device notifies the address of the self-station before the relocation from the relocation terminal. By updating the serial numbers of all the terminals subsequent to the terminal before the relocation in the terminal address data table based on the address and transferring and storing the addresses of all the subsequent terminals at the updated serial number position, This has the effect that address management corresponding to the relocation of the terminal can be performed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a monitoring device and a terminal explaining a local area network device according to the present invention.

FIG. 2 is an explanatory diagram showing contents of a terminal address data table provided in a storage unit 11 in the monitoring device 1 of FIG.

FIG. 3 is a control flowchart of CPUs 10 and 30 when a terminal is added according to the first embodiment of the present invention.

FIG. 4 is a control flowchart of CPUs 10 and 30 when a terminal is relocated according to a second embodiment of the present invention.

FIG. 5 is an operation conceptual diagram showing a state before and after addition of a terminal.

[Explanation of symbols]

1 monitoring device, 10 CPUs, 11 storage units, 2 transmission lines, 3 terminals, 30 CPUs.

Claims (4)

(57) [Claims] 1. In a local area network device in which a plurality of terminals are connected to a monitoring device via a transmission line by a multi-drop method, each terminal is queried for an address to an adjacent terminal, and a reply is made. the the address of the adjacent terminal has provided with a control means for notifying the monitoring device, to the monitoring device, the address
Location of each terminal according to the serial number indicating the location of the storage area
And a terminal address data table storing an address indicating the position of the terminal, and allocating the address of the insertion terminal based on the address of the adjacent terminal notified from the terminal inserted between the terminals. And a control means for notifying the terminal and storing the address in the terminal address data table. 2. A local area network system in which a plurality of terminals which are connected by a multi-drop scheme through the transmission line to the monitoring device, to the monitoring device, A
The serial number indicating the location of the storage area of the dress itself
A terminal address data table in which the addresses of the terminals are respectively stored at the positions of the serial numbers so as to indicate the positions where the terminals are sequentially arranged, and a terminal inserted between the terminals. In response to an address setting inquiry from the terminal, the address of the insertion terminal is set by referring to the address stored in the terminal address data table, the address is notified to the insertion terminal, and the address is stored in the terminal address data table. A local area network device comprising: 3. The control means of the monitoring device updates a serial number which is a storage area of a terminal following the inserted terminal in the terminal address data table when a new terminal is inserted between the terminals. 3. The local area network device according to claim 1, wherein the addresses of all subsequent terminals are transferred and stored in the updated serial number position. 4. The control means of each terminal described above, at the time of relocation,
Notifying the monitoring device of the own station address before the relocation, the control means of the monitoring device transmits the terminal before the relocation in the terminal address data table based on the address notified from the relocation terminal before the relocation. 4. The local area network device according to claim 3, wherein the serial numbers of all subsequent terminals are updated, and the addresses of all subsequent terminals are transferred and stored in the updated serial number position.