JPH03135132A - Station address setting circuit for data communication network - Google Patents

Abstract

PURPOSE:To avoid an address from being set in duplicate by sending a transmission data when the instruction of address setting is issued from a master station and receiving the transmission data sent from other station and storing the address to an address storage section. CONSTITUTION:When a master station sends an initial address setting start command, the network monitoring section 9 of a station A receives the command and sends it to a data processing section 7. The processing section 7 extracts the command from the received packed and gives it to a command monitoring section 8. An address constitution section 10 integrates an address #1 stored in advance in an address storage section 11 with a header packet for address documentation resulting in being an address documentation packet of a prescribed frame structure and sends the packet to a transmission line 1. In this case, the address documentation packet sent from the station A is also fetched by stations B, C and the address #1 is stored in a respective storage section 11. Thus, the stations B, C recognize that the address #1 is already given to other station.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a circuit for setting an address to each station in a data communication network in which a plurality of stations are connected to a data transmission path.

[Conventional technology]

In a so-called packet communication network, multiple stations (computers) are connected on the same transmission path, and each station is assigned a station number (
address) to exchange data in a frame structure called a bucket between each other.

In such a data communication network, each station has an address set, and by including the address of the transmitting station and the address of the receiving station in the packet, the address of the own station is transmitted to the receiving station. Each station takes in and processes a packet containing the station's address. In this way, any stations can communicate with each other.

Therefore, it is necessary to assign addresses to each station without duplication, but conventionally, for example, addresses were set individually by manually operating the depth inch provided at each station, or addresses were assigned using a software switch, etc. It was set.

However, with this address setting method, when the number of stations increases, it is necessary to allocate new addresses and set them individually. For this reason, various difficulties arise in very large-scale communication networks.

Due to these circumstances, for example, Japanese Patent Application Laid-Open No. 61-41246
The invention of No. 1 is proposed.

In the invention disclosed in Japanese Unexamined Patent Publication No. 61-41246, each station connected to the transmission line is configured as shown in the block diagram of FIG. Note that in a data communication network, there is usually a station called the master station that controls the entire system, and other stations controlled by the master station (
The block diagram in FIG. 3 shows the configuration of the slave station.

In FIG. 3, reference numeral 1 is a transmission line, and each slave station is connected to this transmission line 1 via a transmitting/receiving separation unit 2. The packet input to the transmission/reception separation section 2 is sent to the data processing section 7 via the reception section 3, and the command portion included in the packet is passed to the command monitoring section 8.

When transmitting data, from the data processing section 7 to the transmitting section 4
The packet is then sent to the transmission path 1 via the transmission/reception separation section 2.

By the way, in the invention of JP-A No. 61-41246, when an initialization setting start packet is sent from the master station, each slave station receives the initialization setting start packet via the transmission path 1 and the transmission/reception separation section 2, The data processing unit 7 accepts the initialization setting start command included therein. In response to this command, the data processing section 7 sends a predetermined response packet to the transmission line 1 via the transmitting section 4 and the transmission/reception separation section 2.

Further, the command monitoring unit 8 recognizes the initialization setting start command and resets the bucket counter 13, that is, sets the count value to "0". Thereafter, the network monitoring unit 9 detects the number of packets transmitted on the transmission path 1 without collision, and increments the bucket counter 13 each time.

Now, if each slave station sends a response packet to the master station after the initialization setting start packet is sent from the master station, a collision will occur on the transmission ItsI, but the slave station that first succeeded in communicating with the master station , the current bucket counter 1 in your own station
3 (count value + 1) is set as the address.

In other words, the address of the slave station that first succeeded in communicating with the master station is
At that point, the count value of the packet counter 13 is "0", so it is set to '1'.

When this slave station successfully communicates with the master station,
The network monitoring unit 9 of each slave station detects that the packet is transmitted on the transmission path 1 and increments the bucket counter 13. That is, at this point, the count value of the bucket counter 13 of each slave station becomes "1".

Next, each slave station tries to communicate with the master station again, and when a slave station succeeds in communication, the bucket counter 1 at that time
The "count value + 1" of 3, ie, "2" is set as the address of the slave station. Then, as the slave station successfully communicates with the master station, the bucket counter 13 of each slave station is incremented and its count value becomes "21".

Thereafter, addresses are automatically set sequentially for each slave station in the same manner.

FIG. 4 (bl) is a schematic diagram showing the address setting procedure according to the invention of Japanese Patent Laid-Open No. 61-41246 along the time axis.

[Problem to be solved by the invention] By the way, in packet communication, when a certain station tries to communicate, if the transmission path I is empty, it immediately starts communication, but if there is a collision with communication of another station, the dn Communication is temporarily stopped and retransmission is attempted after a waiting time determined according to a predetermined algorithm has elapsed. Of course, if there is a collision again during this retransmission, the transmission will be attempted again after the waiting time has elapsed. Since transmission is performed in this manner, in the invention of Japanese Patent Laid-Open No. 61-41246 mentioned above, in a communication network where many stations are connected to transmission path 1, it takes a long time to determine the addresses of all stations. The problem is that it requires a considerable amount of time.

The present invention was made in view of these circumstances, and
The purpose of the present invention is to provide a station address setting circuit for a data communication network that can automatically set addresses for each station in a shorter time without duplication.

[Means to solve the problem]

The station address setting circuit of the data communication network of the present invention includes an address storage section in which each station stores addresses that have already been confirmed to be assigned to other stations, and an address that is not yet stored in this address storage section. and an address configuration section for setting as .

The present invention provides a circuit for setting an address for each slave station in a data communication network in which a master station that controls the entire system and a plurality of slave stations are connected to a transmission line, in which the transmission line is connected to each slave station for communication by other stations. a network monitoring unit that monitors whether or not the transmission path is being used and performs transmission when the transmission path is idle; and another slave station that delays transmission for a predetermined period of time when the transmission path is not idle. A delay circuit in which a delay time different from the above is set, an address storage unit that stores the addresses set in each station, and an address other than that stored in the address storage unit, and this address and the address storage unit are set. and an address configuration unit that assembles a stored address into one transmission data, and transmits the transmission data assembled by the address configuration unit to the transmission path when an address setting instruction is received from the main station. , and is characterized in that it is configured to receive transmission data transmitted by another station and store it in the address storage section.

[Effect]

In the station address setting circuit of the data communication network of the present invention, when an instruction to start address setting is issued from the master station, each slave station refers to its own address storage unit and automatically determines an address that has not yet been set for another station. Set as the address of the station, send out transmission information that combines the address of the other station that has already been determined and the address of the own station, and this transmission information is received by the other station and determined in the address storage section of each. Since the address is stored as a previously used address, no duplicate address will be set.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on drawings showing embodiments thereof.

FIG. 1 is a block diagram showing the configuration of each slave station including a station address setting circuit in a data communication network according to the present invention.

In FIG. 1, reference numeral 1 is a transmission line connected to a main station (not shown). Each slave station is connected to this transmission path 1 via a network monitoring section 9.

A transmission/reception separation unit 2 is connected to the network monitoring unit 9, and this transmission/reception separation unit 2 sends the received packet to the data processing unit 7 via the reception unit 3 during reception, and also sends the received packet to the data processing unit 7 during transmission. It receives packets from the transmitter 4 via the transmitter 4 and sends them to the transmission path 1 via the network monitor 9.

A command monitoring section 8 is connected to the data processing section 7 for detecting a command from the main station included in a received packet, such as an address setting start command.

Between the network monitoring section 9 and the data processing section 7, an address configuration section 10. Address storage unit 1). Packet configuration units 5 are connected in series.

The address storage unit 1) stores addresses that have already been determined as addresses of other stations.

When an address setting start command is output from the main station, the address configuration unit 10 selects an address other than the address stored in the address storage unit 1), that is, the address that has already been determined as the address of another station, from the own station. 7) is selected as the address of , and the combined information of both is added to the header to create a packet, which is then output to the network 7) work monitoring section 9.

During normal data transmission, the packet constructing section 5 constructs a packet by referring to the address stored in the address storage section 1) and provides it to the data processing section 7.

Further, a delay circuit 12 is connected to the network monitoring section 9. This delay circuit 12 is configured to delay the transmission by the delay time set for each station and retransmit it when each station tries to transmit for address setting and it collides with the communication of another station on the transmission path 1. It is set up for the purpose of

The operation of the data communication (8wA) station address setting circuit of the present invention will be explained with reference to the system flowchart shown in FIG. , C are connected.

The main station sends an address setting start command to transmission line 1 at predetermined intervals.

It is assumed that address 1) is unconditionally assigned to station A. This allows some new slave stations to be added to the transmission line from a state where addresses have already been set for some slave stations.
This is to avoid duplication with a previously set address by unconditionally allocating an address to a specific slave station in advance when connecting to and setting an address.

When the master station sends the first address setting start command,
The network monitoring unit 9 of station A receives this address setting start command and sends it to the data processing unit 7. The data processing unit 7 extracts a command from the received packet and provides it to the command monitoring unit 8.

As a result, the A station starts processing for setting an address. That is, the address configuration section 10 is the address storage section 1.
) is combined with a header packet for address declaration, and the address configuration unit 10 configures the address declaration packet in a predetermined frame structure and sends it to the transmission path 1.

At this time, the address declaration packet sent from the A station is also taken in by the B station and the 0 station, and the address 1) is stored in each address storage section 1).

As a result, stations B and 0 recognize that address 1) has already been assigned to another station.

Next, a second address setting start command is sent from the main station. Upon receiving this, the address configuration unit 10 of the B station starts processing for setting an address in the same manner as in the case of the A station described above. That is, the address configuration section 10 reads out the address 1 stored in the address storage section 1), creates a packet of "header+address #1+address #2", and sends it to the transmission path 1. Similarly, address configuration part 1 of station 0
0 also creates a packet of "Hefda+address 1)+address 13J" and sends it to the transmission path l.

At this time, the packets sent from the B station and the 0 station collide on the transmission path 1. However, the delay circuit 1 of B station and 0 station
If the delay time set for each of the two stations is, for example, 10m5ec for station B and 15m5ec for station 0, and that station B is shorter, then station B will succeed in communicating with the main station first. Therefore, the address I2 of station B is determined.

The message sent from this B station to the main station is “He7da+Addressllll”
+Address #2'' is also taken in by the 0 and B stations and stored in their address storage units 1), in the same way as when the address of the A station was determined as described above. As a result, stations A and B
The station recognizes that addresses 1) and #2 have already been determined.

Therefore, next time the master station sends an address setting start command, the 0th station will receive this and its address configuration section 1 will be sent.
0 reads addresses l1) and 12 from address storage unit 1) to create a packet of "header + address If + address I2 + address #3" and sends it to transmission line 1.

As a result, the assignment of address 13 to station 0 is confirmed.

FIG. 4 fat is a schematic diagram showing the address setting procedure according to the present invention along the time axis.

〔Effect of the invention〕

As described above, according to the data communication (Km) station address setting circuit of the present invention, the time required for address determination is shorter than that of the conventional method, and the address storage section of each station is updated to the latest data set in other stations. Since we always remember the address information of
Duplicate addresses are avoided.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a configuration example of a station address setting circuit of a data communication network according to the present invention, FIG. 2 is a system flowchart showing the procedure for setting the address, and FIG. 3 is a conventional data communication network. FIG. 4 is a block diagram showing an example of the structure of the station address setting circuit of FIG. 1... Transmission path 9... Network monitoring section 10.
... Address configuration section 1) ... Address storage section 12
...Delay circuit patent Applicant: SANYO Electric Co., Ltd.

Claims (1)

[Claims] (1) In a circuit for setting an address for each slave station in a data communication network in which a master station that controls the entire system and a plurality of slave stations are connected to a transmission line, the transmission line for each slave station is used for communication by other stations. a network monitoring unit that monitors whether or not the transmission line is in an idle state and transmits when the transmission line is idle; A delay circuit in which different delay times are set; an address storage unit that stores addresses already set for each station; and an address other than that stored in the address storage unit, and this address and the address stored in the address storage unit. and an address configuration unit that assembles the specified address into one transmission data, and transmits the transmission data assembled by the address configuration unit to the transmission path when an address setting instruction is received from the main station, Further, a station address setting circuit for a data communication network, characterized in that the circuit is configured to receive transmission data transmitted by another station and store it in the address storage section.