JPS59126348A - Relay controller - Google Patents

Abstract

PURPOSE:To cope optionally with the request of change of relay registration at each subsystem on a transmission line by providing a content code registrating table storage memory as to all terminal devices at two transmission lines each and revising the contents of the memory in response to the request from each terminal device. CONSTITUTION:When a command for registering a relay content code FC is received, a processing operating device 43 reads a transmitted address SA in the data, a change start FC and a changed FC number and selects the arrangement of an area corresponding in an FC table 480 by host. Then, the data requiring or not requiring registration in the received data is converted into a registration format of the FC table. This converted data is compared with the registered data of the area in the FC table obtained before, and after the presence of change is confirmed, then the FC registration data of the area is rewritten. If there exists no change, the processing is finished. Further, when a change is produced, the registered data of the corresponding area sequentially to the range of the corresponding FC and to all the SA other than the SA of the received data is extracted and whether the change of the total DC table 481 is required or not is checked.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a relay control device, and particularly to a relay control device provided between transmission lines of a transmission system consisting of a plurality of transmission lines.

[Conventional wave #i] In a multi-loop transmission system in which a plurality of loops are connected, only necessary messages must be selected from among the messages transmitted within each loop, and messages must be exchanged between the loops.

For this reason, conventionally, in order to connect a plurality of transmission loops, a dedicated connection transmission control device is provided for each loop, and connections are made via these control devices.

The following two methods are used to determine whether a sent message can be relayed.

(1) A method in which the connection transmission control device stores in advance the receiving address, loop number, code for content determination, etc. of the message to be relayed as fixed information, and relays the message to the corresponding loop; (II> By issuing an instruction from the processing device connected to the transmission control device for M-connection or the central processing unit connected on the loop, the same judgment element as in (1) above is stored in the memory and its contents are Therefore, this is a method of relaying to the corresponding loop.

However, in the method (1) above, it is difficult to change the judgment elements and there is no scalability, and in the method (11) above, the processing device changes all the judgment elements and the connection configuration between the loops. subsystems connected to Roopuhi cannot change these at their own discretion.

Therefore, a transmission control method has been proposed in which messages are discriminated only by content codes (hereinafter referred to as FC) and relayed selectively between loops (see Japanese Patent Application No. 51,786/1986).

In this method, the transmission control device identifies messages by FC, selectively receives messages using an FC register that can be registered and updated from the processing device, and also receives FC log change messages from each subsystem. Messages are selectively relayed by changing the registration of the FC register of the transmission control device of the corresponding loop. According to this method, there is no need for a special transmission control device for relaying, and all transmission control devices can use the necessary Only relevant data can be relayed, and the content of the relay data can be independently selected from each subsystem.

However, with this method, relaying is no longer necessary for a certain FC in a certain subsystem, so if a registration change message is sent to the relay control device, there is another subsystem within that loop that requires relaying for that FC. The latter subsystem will then no longer be able to obtain the necessary relay data. In order to prevent this, it is not possible to cancel the relay registration, which would eliminate the advantage of being able to dynamically change the contents of the relay, and would also result in an increase in transmission traffic due to unnecessary relay data.

[Object of the Invention] The purpose of the present invention is to improve the above-mentioned problems, and when messages are discriminated by registered FC and selective relaying between transmission paths is performed, an arbitrary method is set for each subsystem on the transmission path. An object of the present invention is to provide a relay control device that can respond to requests for changing relay registration.

[Summary of the Invention] A relay control device of the present invention is connected between two transmission paths each connecting a plurality of terminal devices, and transmits only messages whose content code in the transmitted message matches a registered hood to the transmission path. In the relay control device that relays between them, a content code registration table storage memory for all terminal devices is provided for each of the two transmission paths, and the contents of the memory are updated according to requests from each terminal device. The feature is that the relay of the transmitted message is determined according to the content of the transmitted message.

[Embodiments of the Invention] FIG. 1 is an overall configuration diagram of a multi-loop transmission system to which the present invention is applied.

In FIG. 1, 1.2 is a loop transmission path, 12 is a relay control device, 10□ to 10U and 20□ to 20m are transmission control devices (hereinafter referred to as NCP), 100. ~1OOr1
and 200. ~200m is a processing device (hereinafter referred to as host).

Loop transmission line l and n N CPs 10. ~lOn is 1
A host is connected via each NCP. The loop transmission line 2 also has the same configuration. These two transmission systems are coupled by a relay control device 12 to form a multi-loop transmission system. N CP 10□~10rL.

20□ to 20ffl all have the same structure and the same function, and the connection of the relay control device 12 to the transmission system is exactly the same as the connection of other hosts to the NCP.

host 100. ~100rl, 2002~200. rn
When transmitting data from one of the following, add FC to the data and write it as NCPlo, ~10n, 20. ~20rn to the connected one. NC that received this data
P+-1, a unique source address (hereinafter referred to as SA) for each NCP is added to this, and then transmitted to the loop transmission path I:.

In order to receive data, the host must perform FC registration with the NCP. When the NCP receives data on the loop transmission path, it reads the FC and transmits the data to its own NCP.
If the FC is registered in the CP, the data is transferred to the connected post, and if the FC is not registered, the data is passed directly onto the loop transmission path. Also,
The NCP reads the SA of the received data, and if it is self-originated data, it centralizes it without sending it anywhere.

On the other hand, data selective relay between loops is also performed using the selective reception function of the NCP. In other words, the relay control device] 2 controls the FC of data required on the loop transmission path l side.
Register on P20□. As a result, data on the loop transmission path 2 that requires relaying is taken in from the N CP 20□ and sent to the loop transmission path 1 via the N CP 10°. At this time, data SA, NC
Since it is rewritten by P IQl, loop transmission line 1
When viewed from the side, the relay control device 12 and its two-digit loop transmission line are regarded as one post, and the uniformity of the system is not lost. The above explanation also applies to the relay from the loop transmission line] to the loop transmission line 2.

In the present invention, in the memory in the relay control device ff12,
An individual relay content code table is stored in all transmission control devices 10 and 20 of both connected loops-F, and the relay control device t],
2 collects each content code table, registers the content code of the data that requires relaying in the transmission control device ]o1゜20□, performs relaying, and also sends the above content code table by command from each post 100.200. Update, cancel unnecessary data relay, and start new data relay.

21.DELTA. is a format diagram of a message transmitted through the loop transmission path of FIG.

201 is a start flag (F), 202 is FC, 203 is SA, 2044:1 serial number necessary for transmission control, 20
5 is a data section (Data, ), 2Of'3 is an error detection hood, and 207 end flags CF).

Messages having such a format are transmitted and received between the NCPIo and 20 within each loop transmission line 1 and 2, and are relayed between loops via the relay control device 12.

Figure 3 shows the FC sent from each host in Figure 1.
FIG. 3 is a diagram showing a data format of a registration command.

The format of the message other than the data part is the same as that of the message shown in FIG. 2, and the registered contents are stored in the data part and sent out. 301 is the number of changed FCs (N), 302
is the change start FC (FCo), and 303 is various FC data (D, ~DN) that is set to "1" if registration is necessary starting from FCo, and "°°0" if registration is unnecessary.This format is used for NCP. The FC registration and the relay request registration command to the relay control device 12 described later are common, and the two are distinguished by the FC.

FIG. 4 is a functional block diagram of the NCP in FIG. 1.

In FIG. 4, 30 is a loop reception interface;
31 is a reception buffer, 32 is a processing unit, 33 is a host transmission buffer, 34 is a host interface, 3
5 is a post reception buffer, 36 is a loop transmission buffer,
37 is a loop transmission interface, and 38 is a memory for storing an FC table.

In this case, the NCP connects the relay control device 12,
CP IQ□, and the host is relay control device]2.

NCP 10. is activated and receives FC registration data from the host 12 via the interface 34, and stores this FC registration data in the table of the FC table storage memory 38 via the host reception buffer 35 and processing arithmetic unit 32. Thereafter, if the data received from the host 12 is PC registration data, it is stored in the memory 38 and stored in the FC.
If the data is other than that, it is set in the transmission buffer 36 and transmitted onto the loop transmission line 1 via the interface 37.

On the other hand, the received data from the loop transmission path 1 is stored in the reception buffer 31 via the interface 30. The processing arithmetic unit 32 takes out this data and first checks SA,
If it is self-transmitted data, it is data that has been circulated, so it is deleted.

If it is transmission data from another NCP, it is set in the transmission buffer 36 and transmitted onto the loop transmission line l via the interface 37. However, before that, the processing arithmetic unit 32 refers to the FC table storage memory 38 and records the received data. If the FC is registered in the FC table, this data is copied to the host transmission buffer 33 and transmitted to the host 12 as well. Of course,
Since there is a possibility that it is also registered in the FC table of the other NCP, the data is sent to the loop transmission path 1 and circulated.

5 and 6 are flowcharts showing the processing of the NCP shown in FIG. 4, respectively, in which FIG. 5 shows the processing of data received from the host, and FIG. 6 shows the processing of data received from the loop transmission path. show.

In FIG. 5, when the NCPIO receives data from the host 12 (step 51), it reads the FC of the data, and if it is FC registered data, it writes it in the FC table and updates it (steps 52 and 56). Furthermore, if the data is not FC registered data, the own NCP is set as the SA of the received data, and the data is transmitted from the transmission buffer onto the loop transmission path l (steps 52 to 55).

In FIG. 6, when the N CP 10□ receives data from the loop transmission path 1, it first reads out the SA part of the data (steps 71 and 72). And SA department is own NCP,
In other words, when the data is self-transmitted data, data C and C are erased (steps 73 and 79).

Also, if it is not self-transmitted data, the FC of that data is
Check against table C (steps 73 and 74).

Then, when the FC matches the data in the FC table, that is, when it is an FC that requires reception, a copy is set in the host transmission buffer, transmitted to the host 12, and then the received data is transmitted onto the loop transmission line 1. (Step 75~
78). On the other hand, when F(does not match the data in the JFC table,
In other words, when there is no need to receive the data, the received data is directly transmitted onto the loop transmission line l (steps 75 and 78).

FIG. 7 is a functional block diagram of a relay control device illustrating an example of an implementation of the present invention.

In Figure 7, 41.45 is N CP 101.20
A transmission/reception interface with □, 42.46 is a reception buffer, 44.47 is a transmission buffer, 43 is a processing arithmetic unit,
48 and 49 are FC table storage memories.

When the relay control device 12 is started, the processing arithmetic device 43 performs the following on the FC initialized in the FC table storage memory 48.
NCP 20. Create FC registration data for N, set it in the transmission buffer 44, and send it to
CP 20. Send to. In the same way, for the FC initially set in the FC table storage memory 49, N CP
Create and send FC registration data to 101. As a result, both N CP 10□.

20, register the FC. From now on, the NCP of both loops
When data having an FC matching the registered FC is received from the loop transmission paths 1 and 2, the data receiving devices 10 and 201 transfer the data to the relay control device 12.

Now, NCPlo transfers received data (02), and this data is stored in the reception buffer 42 through the interface 41. The processing arithmetic unit 43 reads this, checks the FC, and selects the PC that indicates the command for relay registration.
(hereinafter referred to as FC), performs FCWC processing, and if it is an outside FC, it is set as is in the transmission buffer 44 and transmitted to the NCP2O□. N CP 20□ is
Since it adds its own SA to the data received from the relay control device 12 and sends it out onto the loop transmission line 2, there is no need to treat the relay data specially in the loop system on the receiving side, and it is different from data sent from a general host. They can be treated the same. −
On the contrary, the operation described in F is N CP 20. received from and NC
It is exactly the same when relaying to Plo.

Next, FC management processing will be explained.

Figure 8 is a configuration diagram of the FC table storage memory in Figure 7.

In FIG. 8, 480 is an FC table array by host, 48
] is the comprehensive FC table.

The FC table is in the form of a two-dimensional array with SA and FC as subscripts, and the corresponding loop (that is, the loop on the NCP IQ□ side for the FC table storage memory 48, and the NCP 20. For each SA of each NCP on the side loop), whether relaying is necessary or unnecessary for each FC is recorded as a value of II l +","OII.

When the medium #FC registration command is received, the processing arithmetic unit 43 registers the SA and change start FC (FCo) in this data.
) and the number of changed FCs (N), and read the FC number (N) by host.
Fetch the array of the corresponding area in table 480.

Next, data necessary for registration and unnecessary data in the received data is converted into the registration format of the FC table. This converted data is compared with the previously obtained registration data of the area in the FC table, and after checking whether there is any change, the FC registration data of this area is rewritten. If there is no change, the process ends.

Next, when a change occurs, for the corresponding FC range, for all SAs other than the SA of the received data, the registered data of the corresponding area is sequentially retrieved, and it is checked whether or not the comprehensive FC table 481 needs to be changed. .

The comprehensive FC table 481 sets the value obtained by calculating the logical OR of all FCCs for each SA, and indicates that relaying is not necessary for FCs that do not require relaying for all SAs, and o'' for FCs that require relaying for even one SA.゛l'' are recorded respectively.

- The method for checking the notes is as follows.

First, the registered data of the FC in the target range for one SA is read. This and the previous changed data are logically summed in FC units to create new changed data. This data is compared with the registration data of the corresponding FC area in the Kasiri FC table 481. If they match, it is assumed that there is no relay FC to newly register or cancel the auction, and the process ends; if they do not match, the same process is repeated for the next SA. If all SAs have been checked and there are changes, the comprehensive FC table 481 is rewritten with the changed data. Then, from this data, registration data for the N CP 20° and relay FC change command data 0υ for another relay control device in the destination loop are created and sequentially sent to the transmission buffer 44.

The above is the operation of FC management processing for data input from NCPIO and side loop, but relaying in the reverse direction, that is, NCP 20. The operation of FC management processing for data input from the side loop is also exactly the same.

FIG. 9 is a free chart showing the processing of the relay control device in FIG. 7.

When the relay control device 12 receives data from the connected NCP, it checks the FC of the received data (
Step 81.82). If the FC is not a relay PC registration command, it is sent as is to the NCP connected in the opposite direction (step 83.95). If FC is a relay FC registration command, a host notification number is calculated from SA, FC table data corresponding to the host number is read out, and the contents are compared to determine whether they match (steps 83 to 86).

As a result of the comparison, if there is a discrepancy or a change, the corresponding FC table is updated, the logical sum (or for each host) of all FC tables is taken, and the result is compared with the comprehensive FC table (α6) (steps 86 to 8).・89).

As a result of the comparison, if there is a discrepancy or a change, the overall F
After updating the C table, create NCP registration data and
P and register it in the memory of that NCP (step 9
0-93). Also, relay FC for another relay control device
Create a registration command and send it to the NCP (Step 9)
4.95).

In the initial setting of the medium gFC, the values of the FC table and the general FC table are set by loading data set in advance in the ROM or by manually inputting the data. At this time, as long as at least the FC (FCo) of the midline FC change command is set, remote registration of other FCs from any subsystem on the loop is possible.

In this way, in the present invention, the relay control device is
Since it is possible to connect to P under exactly the same conditions as other hosts, there is no need to use a special NCP for relaying, and it is possible to connect to any NCP, and even if another loop is connected beyond that, There is no need to recognize and perform special processing on individual loops. Note that the present invention is not limited to loop transmission lines, but can also be applied to Nakanodenmaze.

According to the present invention, in a transmission system in which a number of transmission lines are combined, an independent FC table is created in the relay control device to indicate the installation status of the relay FC for each post. In order to save these FC tables and register the PC in NCP, each subsystem of transmission line-L is one of the subsystems of
1- Requests for relaying and canceling relaying can be sent arbitrarily regardless of the situation, and the registration of the relay will not be automatically canceled due to the tab system of the relay. Therefore, if applied to a multi-transmission system, it will increase the independence of individual subsystems, change the data to be relayed depending on the situation, improve transmission efficiency, and increase the complexity of the system structure. Expandability can be improved.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram of a multi-loop transmission system to which the present invention is applied, and Fig. 2 is a diagram of the loop diagram in Fig. 1.
: Format diagram of the network that transmits the network, fσ3 diagram Lt T”C sent from each post connected to the PA1 diagram
Noppa 1)] Command data format diagram, No. 4-
The diagram is a functional block diagram of the NCP in Figure 1, whistle 51'
4. Figure 6 shows the NCP part in Figure 4] A flow chart showing J11; Figures 1 and 2 are explanatory diagrams of the contents of the C table storage memory, and Figures 2 and 9 are flowcharts showing the processing of the relay control device in Figure 17. ]12; Loop transmission line, ]O engineering~]Oゎ, 20, ~20
: NCP (transmission; 1, 1 111 equipment '8), 12: Relay control device, 100. ~100, 2002~200
1rl: Host (prostitution device), 32.43: Processing calculation device, 38.4-8°4-9! 1” C table storage memory, 30.34.37.4-1゜45: Interface,
3'3.36.44-, 4-7: Transmission buffer, 31
．． 35.42.4, 6: Receive buffer. 09) (20) Figure 5 Figure 6 Figure 8 FC□ 0 1234567

Claims (3)

[Claims] (1) In a relay control device that is connected between two transmission lines each connected to a plurality of terminal devices, and relays only messages between the transmission lines whose content code in the transmitted message matches a registered code, A content code registration table storage memory for all terminal devices is provided for each of the two transmission paths, and the contents of the memory are individually updated in response to requests from each terminal device, and transmission messages are updated according to the updated contents. A relay control device characterized by determining relay. (2) The content food entry table storage memory stores an individual content code table corresponding to each terminal device and a comprehensive content code table that holds a value obtained by taking the logical sum of the content codes for all terminal P4 devices. A relay control device according to claim 1, characterized in that: (3) The relay of the transmitted message is determined by creating registration data from the updated contents after the content code registration table storage memory is updated, and requesting registration to the adjacent terminal equipment for each transmission path. 3. The relay control device according to claim 1 or 2, wherein