JPH0158704B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data way system having a plurality of master station devices.

[Conventional technology]

Generally, in a data way system configured by connecting a plurality of station devices via a circular transmission path, a master station device is often coupled to a computer or similar device. Computers are often required to be duplexed or combined in order to achieve high reliability, and in response to this, it is often necessary to install multiple master station devices. In this case, a configuration is required that allows a terminal device belonging to a general data station device to easily access an appropriate master station device.

FIG. 1 is a block diagram showing the general configuration of a data way system having a plurality of master station devices as described above, in which 10 is a compound computer;
21, 22...2n are master station devices, 3
0 is a data way monitoring device, 41, 42...4n are general station devices, 51, 52...5n are terminal devices belonging to the corresponding general station device, 60
is a circular transmission line.

Each master station device has a unique address within this dataway system, and when a general station device transmits a signal to each master station device, it can specify a unique address and perform the transmission. is necessary. In this case, in order to deal with a failure of the master station device, there are two methods: (1) to give intelligence to the terminal device connected to the general station device and give it a function that always sends a signal to the normal master station device; , (2) A method can be considered in which the multifunction computer side notifies the terminal device side of the address information of a normal master station device and switches the destination.

[Problem to be solved by the invention]

Either of the above methods requires advanced functions from the terminal device connected to the general station device, which has the disadvantage that the entire complex system becomes expensive.

The present invention has been made in view of the above-mentioned conventional drawbacks, and its purpose is to always access an appropriate master station without providing any advanced functions to the terminal device connected to the general station device. The objective is to realize a data way system that is as simple and inexpensive as possible and has high transmission efficiency.

[Means to solve the problem]

In a data way system in which a plurality of master station devices and a plurality of general station devices are connected by a ring transmission path, the ring transmission path is used for information transmission between each of the master station devices and each of the general station devices. In the line frame sent to each of the master station devices, reception capability information of the master station device, station address information of the general station device communicating with the master station device, and transmission request of the general station device are provided in correspondence with each master station device. Provide at least each column of information.

[Effect]

Based on the information in these columns, each general station device detects an idle master station device and connects the line, and each of the master station devices detects a general station device in communication and starts oscillation. Make regulations.

〔Example〕

The details of the present invention will be explained below with reference to Examples.

Figure 2 shows the master station device 2 in Figure 1.
1 is a block diagram of an embodiment of the present invention showing the configuration of a station device 1 and a general station device 41. FIG. In the master station device 21, 71 is a computer interface section, 72 is a signal analysis/control section, 73 is a signal/dataway transmitting/receiving section, 74 is a used station address storage section, and 75 is a transmission restriction station address storage diagram. Further, in the general station device 41, 81 is a terminal interface section, 82 is a signal analysis/control section, and 83 is a signal/data transmission/reception section.

FIG. 3 is a line frame configuration diagram of information transmitted on the circular transmission path 60 under the control and monitoring of the data way monitoring device 30 in one embodiment of the present invention, where FF is a frame synchronization pattern, SND is a column for writing communication information, and devices DATA1, DATA2, . The operation of the apparatus of the embodiment shown in FIG. 2 will be described below with reference to the frame structure shown in FIG.

When the general station device 41 receives a data transmission request from the terminal device 51 to the multifunction computer 10 via the terminal interface unit 81, the general station device 41 performs signal analysis and
The control unit 82 analyzes the communication information SND within the entire frame shown in FIG. As shown in the enlarged view below, this communication information corresponds to each master station device 21 to 2n, and has columns MST1STS, MST2STS, etc. that display whether or not the master station device 21 to 2n can perform reception operations.
MSTnSTS, general station equipment 41 to 4
Columns RQS1, RQS2...RQSn, where transmission request information between n and the master station devices 21 to 2n is written.
It consists of columns ADRS1, ADRS2, . . . ADRSn, in which station address information of general station devices using the master station device is written.

If there is no display in either the RQSi column or the ADRSi column following the MSTiSTS column (i=1, 2, . . . n), the i-th master station device is in an empty state. On the other hand, if there is a display in the RQSi column following the MSTiSTS column, and any general station device other than the local station is displayed in the ADRSi column, the i-th master station device is in use.

Assume that the master station device 21 is currently in an idle state, and that the general station device 41 has detected this by analyzing the SND column. The general station device 41 writes transmission request information in the RQS1 column of the SND column exclusively owned by the master station device 21, and also writes its own station device address in the ADRS1 column, and sends the frame signal/data transmitter/receiver 83 to the transmission line 60. Send to. The master station devices 21 to 23 are
The entire frame is received via the signal/data transmitting/receiving section 73. The signal control/analysis section 72 of each master station device is assigned to its own station.
If transmission request information is written in the RQSi column of the SND column, the address of the general station device written in the corresponding ADRSi column is stored in the used station address storage section 74.

Now, assuming that there is only a transmission request from the above-mentioned general station device 41 to the master station device 21, the master station device 21 stores its used station address storage unit 74.
The address of the general station device 41 is stored in . The master station device 21 stores the address of the general station device 41 in the used station address storage unit as described above, and
If it is not impossible to send or receive due to a malfunction, etc., write the receivable information in the MSTiSTS field in the SND field.
This line frame is sent from the signal/data transmitting/receiving section 73 to the transmission line 60.

The master station devices 22 to 2n transmit ADRSi in the SND column of transmission frames other than those owned by the master station devices 22 to 2n.
The station address of the general station device written in the column is detected by the signal analysis/control unit 72,
This is the transmission restriction station address storage device 7.
Store in 5. In the above case, the address of the general station device 41 is newly written to the transmission restriction station address storage device 75 of the master station devices 22 to 2n.

In this case, if the master station device is configured to always analyze the SND field of the line frame when a transmission is necessary, the transmission restriction station address storage device 75 is not necessarily required.

When the general station device 41 detects the ADRS1 column in which the own station address is written in the SND column, it determines whether receivable information is written in the MST1STS column immediately before it. From the above, this judgment result is positive, and as a result,
A line connection is established between the terminal device 51 and the multifunction computer 10. If the master station device 21 is unable to transmit or receive due to a malfunction, etc., the above MST1STS
Receivable information is written in the field, so the above determination result is negative. In this case, the line connection is interrupted using the same procedure as the disconnection operation described later.

As described above, when a line connection is established between the terminal device 51 and the multifunction computer 10 via the general station device 41 and the station device 21, the terminal device 51 sends data, which is sent to the transmission path as DATA1 of the MST1 frame. 60. The address of the general station device 41 to which the terminal device 51 in communication is connected uses the information stored in the outgoing restriction station address storage device 75 of all the other master station devices 22 to 2n, as described above. Or, by analyzing the SND column each time, these master station devices restrict outgoing calls to the general station device 41. That is, when the master station devices 22 to 2n receive a transmission request from the multifunction computer 10 to the general station device, they check the incoming station address with the contents of the outgoing restriction station address storage section 75, or check the address in the ADRS field in the SND field. address, and if there is a match, reject the transmission request. Therefore, signals are not sent redundantly from a plurality of master station devices to the terminal device 51 during communication.

Next, line disconnection will be explained. When the general station device 41 receives a communication end signal from the terminal device 51 via the terminal interface 81,
In the signal analysis/control unit 82, the corresponding SND column is
The information in the RQS1 column and ADRS1 column is deleted and sent from the signal/data transmitting/receiving section 83 to the transmitting section 60. Master station device 21 is SND
When receiving the information in which the RQS1 column of the column has been erased, the storage contents of the used station address storage section 74 are erased, the information in the MST1STS column of the SND column is also erased, and the line with the general station device 41 is disconnected. Meanwhile, the other master station device 2
2 to 2n are RQS1 column of SND column and MST1
When information with the STS column cleared is detected, one of the general station device addresses stored in the outbound calling restriction station address storage device 75 is detected.
The address of the general station device 41 corresponding to the MST1STS column is deleted. As a result, the restriction on outgoing calls from these master station devices to the general station device 41 is lifted.

Line connection, data transmission, and line disconnection from the master station device 21 to the general station device 41 are also performed in substantially the same manner as described above. That is, when the master station device 21 receives a transmission request from the multifunction computer 10 to the general station device 41, it analyzes the contents of the outgoing restriction station address storage device 75, and if the outgoing call to the general station device 41 is not restricted. , the receivable information and the station address of the general station device 41 are written in the MST1STS column of the SND column and the subsequent ADRS1 column in FIG. General station equipment 41
When it detects its own address in the ADRS1 column of the SND column, it knows that there is a transmission request because receivable information is written in the immediately preceding MST1STS column, and if it is receivable, it indicates that it can receive in the RQS1 column. It responds to the write master station device 21 by writing transmission request information to indicate that there is a request. When the master station device 21 learns that the transmission request information is written in the RQS1 column, a line connection is established and transmission is started.

The master station device 21 is a compound computer 1
When receiving a communication end signal from 0, MST in the SND column
1 Delete the information in the STS column and transfer this to the transmission line 60.
Send to. At general station 41, MST
When receiving information with the 1STS column cleared, RQS1
column, delete the information in the ADRS1 column. As a result, the line is disconnected, and when the other master station devices 22 to 2n receive information that the MST1STS column in the SND column has been deleted, the station of the general station device 41 stored in the outgoing restriction station address storage device 75 Erase address.

Although the data transmission between the general station device 41 and the master station device 21 has been described above, data transmission between other master station devices and the general station device can be performed using exactly the same procedure. Furthermore, the same effect can be obtained by dividing the SND column into each MSTi frame and arranging it.

〔Effect of the invention〕

As described above in detail, the present invention allows each of the plurality of master station devices to exclusively use a different transmission frame and transmits communication information indicating the communication partner, and each of the general station devices determines whether the master station is free or not based on this communication information. The terminal device connected to the general station device is connected to the master station device located at , you can communicate with master station devices without being aware of their addresses. Therefore, there is no need to add any sophisticated functions to the terminal device, and a data way system that is simple, inexpensive, and has high transmission efficiency can be realized.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the general configuration of a data way system having a plurality of master station devices, FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 is a block diagram of an embodiment of the present invention. FIG. 3 is a line frame configuration diagram. 10...Compound computer, 21 to 2n...Master station device, 30...Dataway monitoring device, 4
1 to 4n...General station equipment, 51 to 5
n...Terminal device, 60...Annular transmission line, 71...Computer interface unit, 72, 82...Signal analysis/control unit, 73, 83...Signal/dataway transmission/reception unit,
74... Use station storage section, 75... Call restriction station address storage section.

Claims (1)

[Claims] 1. In a data way system in which a plurality of master station devices and a plurality of general station devices are connected by a ring transmission path, the ring transmission is used for information transmission between each master station device and each general station device. In correspondence with each of the master station devices, the line frame transmitted to the network includes information on whether or not the master station device can receive data, station address information of a general station device communicating with the master station device, and transmission information of the general station device. At least each field of request information is provided, and based on the information in each of these fields, each of the general station devices detects a master station device that is in an idle state and connects the line, and each of the master station devices detects a master station device that is in an idle state and connects the master station device to a master station device that is currently in communication. 1. A data way system having a plurality of master station devices, which detects general station devices and restricts outgoing calls.