JP3216894B2 - Automatic address number setting method of communication control device in communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for automatically setting an address number of a communication control device in a communication system.
The present invention is useful when applied to a communication system that realizes two-way communication using the optical fiber communication path.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram showing a recently developed communication system for realizing bidirectional communication with one optical fiber communication path. As shown in FIG. 1, the communication system includes a communication control device (hereinafter simply referred to as a host) 1 serving as a host, and a number of communication control devices 2-1, 2-2, and 2 serving as terminal devices of the host 1. -3,..., 2-n.
−n are connected in cascade with one optical fiber communication path 3. At this time, couplers 4-0, 4-1, 4-2, 4-3,.
-N is provided corresponding to the host 1 and the communication control devices 2-1 to 2-n.

The host 1 and the communication control devices 2-1 to 2-n
Are optical signal transmitters 1a, 2a-1, and 2a-, respectively.
, 2a-3, ..., 2a-n, receiving units 1b, 2b-1,
2b-2, 2b-3,..., 2b-n, CPUs 1c, 2c-1,
2c-2, 2c-3, ..., 2c-n,
Address numbers # 0, # 1, # 5, # 10,..., # 3 of natural numbers that increase with distance from the host
0 is assigned. The memory of the CPU 1c of the host 1 stores all address numbers # 0 to # 30 as a list. CPU 2c- of each communication control device 2-1 to 2-n
The memories 1 to 2c-n have their own address numbers # 1 to # 3.
0 is stored.

FIG. 6 is an explanatory view conceptually showing a format of communication information used in the communication system.
As shown in the figure, in this format, a source α, a destination β, and a relay unit γ are provided in the header, and a message δ is recorded in an area following the header.

In the communication system, the same information processing is performed in all the communication control devices 2-1 to 2-n. For example, when the communication control device 2-2 of the address number # 5 receives the communication information, The following processing is performed based on the information of the header of the communication information.

Α ≦ γ <# 5 <β and α ≧ γ># 5
> Β, the address number of the relay unit γ of the received communication information is rewritten to # 5, and the adjacent communication control devices 2-1 and 2-2 are rewritten.
-3. When β = # 5, the message δ is fetched and processed. Do nothing other than,.

Therefore, when the communication control device 2-2 receives, for example, the communication information of α = # 0, β = # 30, and γ = # 1, the communication information is rewritten to γ = # 5 to perform the communication. It is sent to the control devices 2-1 and 2-3. As a result, the communication control device 2-1 determines that the above condition is satisfied, and does not perform any further transmission. On the other hand, the communication control device 2-3 determines that the above condition is satisfied, and performs the predetermined processing as described above.

Thus, by sequentially transmitting communication information to the adjacent host 1 and the communication control devices 2-1 to 2-n in a bucket brigade manner, the host 1 and the communication control device 2-1 are transmitted.
To 2-n is realized by one optical fiber communication path 3.

[0009]

According to the communication system as described above, there is an advantage that bidirectional communication can be realized by one optical fiber communication path 3, but with the addition of a communication control device of a terminal, There remains a problem in the work of assigning and changing address numbers. That is, in the similar communication system according to the related art, the assignment / change of the address number is performed by manually rewriting the storage contents of the memory of the host 1 and the communication control devices 2-1 to 2-n by a worker. Although a new address number is written in the memory of the communication control device to be added, such a work requires not only human labor but also erroneous input. Therefore, in the communication system, when assigning or changing the address number, if this is manually performed, the above-described problem remains as it is.

SUMMARY OF THE INVENTION In view of the above prior art, the present invention provides a method for setting an address number of a communication control device in a communication system capable of automatically adding or changing an address number accompanying the addition of a communication control device of a terminal. The purpose is to provide.

[0011]

The structure of the present invention to achieve the above object is as follows.

A communication control device serving as a host including a communication unit and a reception unit for an optical signal and a CPU serving as a signal processing unit, and a transmission unit and a reception unit for an optical signal and a CPU serving as a signal processing unit. A large number of communication control devices, which are terminal devices of the communication control device, are connected in cascade with one optical fiber communication path in which a coupler for splitting an optical signal is provided corresponding to each communication control device, and a host. And assigning a natural number address number to each communication control device that increases or decreases as the distance from the communication control device increases and the difference between adjacent communication control devices is 2 or more,
In the header of the communication information, the source, the destination and the address number of the relay unit are added, and the address number recorded in the relay unit and the destination is greater than the address number of the communication control device that has received the communication information, Or, when the address number recorded in the transmission destination is smaller than the address number of the communication control device that has received the communication information, the address number of the relay unit is rewritten to its own address number. In a communication system in which bidirectional communication between communication control devices is performed by one optical fiber communication path by sequentially transmitting rewritten communication information to an adjacent communication control device, a communication control device of a terminal is used. Is added to or connected to an optical fiber communication path via a coupler between existing communication control devices, the CPU of the communication control device to be added is
The largest address number that can be assigned, or the smallest address number that can be assigned, is written to the memory of the communication control device to be added, and is recorded in the relay unit of the communication information received at the time of polling from the communication control device of the host. Based on the address number, an address number obtained by adding or subtracting 1 to or from this address number is rewritten as a new address number of the communication control device itself to be added to the content recorded in the memory of its own CPU. To the new address number in a message,
In the communication control device of the host, each communication from the communication control device having the largest or smallest address number to the communication control device to be added so that the difference between the address numbers of adjacent communication control devices is 2 or more. Whether at least the communication information including a message for rewriting the own address number by adding at least one to the own address number of the control device or subtracting at least one from the own address number to determine whether the control information is the largest at present. Or, in order from the communication control device having the smallest address number,
Rewrite the address number of each communication control device recorded in the memory of its own CPU, and in each communication control device,
The number is rewritten to each address recorded in the memory of its own CPU based on the communication information transmitted by the communication control device of the host.

[0013]

According to the present invention having the above structure, after a new communication control device is added to an optical fiber communication path, when the added communication control device receives polling communication information from the communication control device of the host, After transmitting this communication information from the added communication control device, no further communication is performed when the communication control device adjacent to the communication control device receives the communication information.

At this time, since the new address number is notified from the added communication control device to the communication control device of the host, the address number of the communication control device of the host increases as the distance from the communication control device of the host increases. A communication message for rewriting the address number of the communication control device of the terminal is transmitted so as to increase or decrease, and each of the predetermined communication control devices rewrites its own address number.

As a result, the difference between the address numbers of the adjacent communication control devices becomes two or more in preparation for the addition of the next communication control device, and the address number maintaining the predetermined regularity as described above is used. Granted.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

As shown in the figure, in the present embodiment, the communication control unit 2- (n + 1) of the terminal is added to the communication system shown in FIG.
Is added / connected to the optical fiber communication path 3 via the coupler 4- (n + 1) at a position adjacent to the communication control device 2-3 on the side opposite to the host 1. Therefore, in FIG. 1, the same parts as those in FIG. 5 are denoted by the same reference numerals, and duplicate description will be omitted. Further, the communication control device 2- (n + 1), like the communication control devices 2-1 to 2-n, includes the transmission units 2a- (n + 1),
It has a receiving unit 2b- (n + 1) and a CPU 2c- (n + 1). The format used in the communication system shown in FIG. 1 is the same as that shown in FIG.

A communication control device 2- (n + 1) to be added
The largest address number among the address numbers allowed as device numbers in the memory of the CPU 2c- (n + 1).
Writes the N _{ma x.}

In the communication control device 2- (n + 1), the address number recorded in the relay unit γ of the communication information received at the time of polling from the host 1 (# in this embodiment)
Based on 5), the address number # 6 obtained by adding 1 to the address number # 5 is used as the address number # 6 of the communication control device 2- (n + 1) itself, and its own CPU 2c- (n + 1)
And the host 1 is notified of the new address number # 6 by the message δ.

In the host 1, address numbers # 0 to # 3 of the adjacent communication control devices 2-1 to 2- (n + 1)
From the rightmost communication control device 2-n of the currently highest address number (# 30 in this embodiment) in the figure, the communication control device 2-n is directed leftward so that the difference of 0 is 2 or more. 2-n,..., 2- (n + 1)
3, 2- (n + 1) own address number # 30,.
The communication information including the communication message δ for rewriting # 10 and # 6 is sequentially transmitted from the communication control device 2-n having the largest address number # 30 at present. Message δ at this time
Is at least 1 for each address number # 30 to # 6.
This is a command to add (in this embodiment, 1). At the same time, the contents of the memory of the CPU 1c are rewritten to address numbers # 31,..., # 11, # 7 after adding 1, and the address numbers are updated.

Each communication control device 2-n,..., 2-3,
2- (n + 1), based on the communication information sent by the host, its own CPU 2c-n,..., 2c-3, 2c-
Each of the address numbers # 30,..., # 10, and # 6 recorded in the memory (n + 1) is rewritten to the address numbers # 31,.

According to the above embodiment, the optical fiber communication path 3
When a communication control device 2- (n + 1) receives polling communication information from the host 1 after adding a new communication control device 2- (n + 1) to the communication control device 2- (n + 1), the communication information is transmitted to the communication control device 2- (n + 1). n + 1), the communication control device 2- (n + 1) and the adjacent communication control devices 2-2 and 2-
No further transmission takes place when 3 is received.

On the other hand, the communication control device 2- (n + 1) refers to the address number of the relay section γ of the communication information at the time of polling to find the nearest sender, and adds an address number obtained by adding 1 to this address number to a new address. Address number,
The host 1 is notified of the new address number.

In the host 1, based on the new address number, a predetermined communication control device 2-n, a predetermined communication control device 2-n, so that the difference between the address numbers between the adjacent communication control devices 2-1 to 2- (n + 1) becomes 2 or more. .., The address number of 2- (n + 1) is rewritten. At this time, rewriting is performed in order from the communication control device 2-n furthest to the host 1, that is, the communication control device 2-n having the largest address number, in the leftward direction in FIG. 1 so that the rewritten address numbers do not overlap. Thus, the address numbers of the changed communication control devices 2-n,..., 2- (n + 1) increase as the distance from the host 1 increases, and the adjacent communication control devices 2-n,. The difference between the address numbers of the control devices is 2 or more.

FIG. 2 is a flowchart of the algorithm for automatically setting the address number as described above for each of the communication control device 2- (n + 1), the host 1, and each of the communication control devices 2-1 to 2-n. 3 and FIG.

In the communication system to which the above-described embodiment is applied, an address number that increases as the distance from the host 1 increases is assigned. Applicable. In this case, the smallest address number that can be assigned is first written into the communication control device to be added, and 1 is subtracted from the initially assigned address number during polling. At least 1 should be subtracted from the address number.

[0027]

As described above in detail with the embodiments, according to the present invention, a new communication control device is added to a communication system in which a large number of communication control devices are cascaded by one optical fiber communication path. In this case, the address number of each communication control device can be automatically updated without manual operation.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram for explaining an embodiment of the present invention.

FIG. 2 is a flowchart showing an embodiment of the present invention in a communication control device to be added.

FIG. 3 is a flowchart showing an embodiment of the present invention in the communication control device of the host.

FIG. 4 is a flowchart showing an embodiment of the present invention in an existing communication control device.

FIG. 5 is a block diagram showing a communication system to which the present invention is applied.

6 is an explanatory diagram conceptually showing a format of communication information used in the communication system shown in FIG.

[Explanation of symbols]

1,2-1 to 2- (n + 1) Communication control device (host and terminal equipment) 1a, 2a-1,2a- (n + 1) Transmission unit 1b, 2b-1,2b- (n + 1) Reception unit 1c, 2c- 1,2c- (n + 1) CPU 3 Optical fiber communication path 4-0-4-n Coupler

──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazuo Watanabe, 1-chome, Taya-cho, Sakae-ku, Yokohama-shi, Kanagawa Prefecture Inside the Yokohama Works, Sumitomo Electric Industries, Ltd. (72) Katsuya Yamashita 1-6-1, Uchisaiwaicho, Chiyoda-ku, Tokyo Japan Telegraph and Telephone Co., Ltd. (58) Fields surveyed (Int. Cl. ⁷ , DB name) H04L 12/403

Claims (1)

(57) [Claims] A communication control device serving as a host having a communication unit and a reception unit for optical signals, and a CPU serving as a signal processing unit;
Similarly, a plurality of communication control devices serving as terminal devices of the communication control device having a transmission unit and a reception unit of an optical signal and a CPU serving as a signal processing unit are connected to each communication control device by a coupler for branching an optical signal. Is a natural number that increases or decreases as the distance from the communication control device acting as the host increases and decreases, and that the difference between adjacent communication control devices is 2 or more. And the address numbers of the transmission source, the transmission destination and the relay unit are added to the header of the communication information, and the address numbers recorded in the relay unit and the transmission destination are the communication information. Is greater than or less than the address number of the communication control device that received the communication information, and the address number recorded in the transmission destination is the communication control device that received the communication information. In the case other than when the address numbers match, the address number of the relay unit is rewritten to its own address number, and the rewritten communication information is sequentially transmitted to the adjacent communication control devices, thereby enabling communication between the respective communication control devices. In a communication system in which two-way communication is performed by one optical fiber communication path, a communication control device of a terminal is added to and connected to an optical fiber communication path via a coupler between existing communication control devices. In this case, the largest address number that can be assigned or the smallest address number that can be assigned is written in the memory of the CPU of the communication control device to be added, and the added communication control device receives the polling from the communication control device of the host. Based on the address number recorded in the relay section of the communication information, the address obtained by adding or subtracting 1 to this address number Self CPU to issue, as a new address number of the communication control apparatus itself to be added
Rewrites the recorded contents of the memory, and notifies the host communication control device of a new address number in a communication message. In the host communication control device, the difference between the address numbers of adjacent communication control devices becomes 2 or more. As described above, at least one is added to the own address number of each communication control device from the communication control device having the largest or smallest address number to the communication control device to be added, or at least While the communication information including the communication message for rewriting the own address number by subtracting 1 is currently sent out from the communication control device having the largest or the smallest address number in order,
Rewrite the address number of each communication control device recorded in the memory of its own CPU, and in each communication control device, record it in the memory of its own CPU based on the communication information sent by the communication control device of the host. A method for automatically setting an address number of a communication control device in a communication system, wherein a number is rewritten to each set address.