JPH0273741A - Data communication monitor processing device - Google Patents

Abstract

PURPOSE:To allow each station under token passing to detect the state of other stations by providing a means storing an address of a token frame transmission station (active station) and a means replying the inquiry of the active station from an optional station. CONSTITUTION:A modulation/demodulation section 111 to a token passing path medium, a serial data transmission/reception section 112, a data processing section 113 applying data processing such as token frame detection, address storage processing, inquiry frame detection, comparison of storage address and reply frame transmission, a current memory 114 storing tentatively the address and a basic memory 115 storing the address are provided to the unit. When an address of a designated station is coincident with an address stored in the memories 114, 115, a reply data frame representing an active state and when the address is dissident, the reply data frame representing an inactive state are sent respectively with respect to an inquiry frame from an optional station inquiring whether the designation station is active or not. Thus, an optional station can detect the state of other station by sending an inquiry frame on the occurrence of a fault or the like.

Description

Detailed Description of the Invention (Industrial Application Field) This invention relates to a local area network (hereinafter referred to as LAN) using token passing as an access control method.
The present invention relates to a data communication monitoring and processing device in a computer.

(Prior art) Conventionally, in a token-passing LAN, there is no special LAN medium monitoring station, which monitors the joining status of stations to the logical ring configured on the token bashing bus and responds to inquiries from arbitrary stations. There was no device to notify the active status of other stations.

Figure 2 is a diagram showing the configuration of a LAN based on this conventional token bashing bus method, in which (1) is a token bashing bus, (2) is a logical ring configured on the token bashing bus, and (11) is a LAN configuration based on this conventional token bashing bus method. ~(14) are stations 1, 2 . . . that have joined the logical ring. n-1,n, (15) indicates station m that has not joined the logical ring.

Based on the token passing method with such a configuration
In LAN, token bashing bus (
1) the stations activated on constitute a logical ring (2);
The token frame is circulated from station to station, and the station with the token frame obtains the transmission right, making it possible to transmit the frame to any station.

However, each station can know the addresses and status of other stations by only knowing its own address, the address of the preceding station from which it receives token frames, and the address of its own station to which it sends token frames. There wasn't.

Therefore, when a frame is transmitted to another station, the layer that processes the token passing method cannot know whether the frame has correctly arrived at the other station or whether the other station is active.

(Problem to be solved by the invention) As mentioned above, based on the conventional token passing method,
In a LAN, it is not possible to determine whether a partner node is active or inactive below the token passing layer, so various protocols had to be set up in the upper layer to monitor the status of the partner node. . Therefore, in addition to placing a burden on upper layer protocol processing,
When the failure occurred, did an abnormality occur at the physical layer level?
There was no way to check whether an abnormality had occurred in the upper layer protocol.

The present invention has been made to solve the above-mentioned problems, and provides a data communication monitoring and processing device capable of detecting whether a partner node notebook during communication is in an active state or an inactive state. With the goal.

[Means to solve the problem]

A data communication monitoring processing device according to the present invention receives frames of all addresses sent on a bus in a local area network using a token bashing bus method as an access control method, and also receives frames of all addresses sent out on a bus, and also receives a predetermined number of frames for inquiry frames. A data transmitting/receiving unit that transmits a response data frame after data processing to the station with the source address, a memory that stores the address of the station that sent the token frame, and an inquiry frame from any station that inquires whether the designated station is active or not. A data processing unit is provided to perform data processing for transmitting a response data frame with content indicating activation when the designated station matches the address stored in the memory, and deactivation when the address does not match. It is something that

[Effect]

The data communication monitoring processing device according to the present invention stores in the memory the address of the station that transmitted the token frame while the token frame goes around an arbitrary station as a reference,
The data processing unit responds to the inquiry frame from any station by comparing it with the stored address, so when a failure occurs, any station can detect the status of other stations by sending the inquiry frame. becomes.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. Second
In Fig. 1, parts that are the same as those in the figure are designated by the same reference numerals.
(101) is a data communication monitoring and processing device according to the present invention, which includes a modulation/demodulation unit (111) for a token bashing bus medium of the data communication monitoring and processing device, a serial data transmission/reception unit (112), token frame detection, address storage processing, and inquiry frame detection. , data that performs data processing such as comparing stored addresses and sending response frames!
Part A31 (113) has a current memory (114) for temporarily storing addresses and a basic memory (115) for storing addresses, and responds to inquiry frames from any station inquiring whether a designated station is active or not. When the designated station matches the address stored in the memories (114) and (115), a response data frame is sent out indicating activation, and when they do not match, it is inactive.

Next, the data processing operation in the above configuration will be explained in detail. First, by physically connecting this data communication monitoring processing device to the token bashing bus (1) and then starting it, frames being transmitted by other stations are transferred to the modulation/demodulation section (111).
The data is received via the data transmitting/receiving section (112). The data processing unit (113) extracts only the token frame and arbitrarily set inquiry frame from these frames, and discards the others. Next, the processing when two frames are received will be described.

Once a token frame is received, its source address is saved in a register and stored in the current memory (114).
Accumulate in. After that, until a token frame with the same address is received again, when a token frame is received, it is stored in the current memory in the same way. When a token frame with the same address is received again, the basic memory (115)
Accumulate in. After that, the token frame wait is started again.

Therefore, a query frame (request with
response data format), it compares the data in this data unit with the addresses stored in the current memory and basic memory, and if they match, it responds to the station with the source address with a data frame indicating that fact. , if they do not match, a data frame indicating that fact is sent as a response to the station of the source address.

Therefore, when a failure occurs, any station can transmit an inquiry frame to this station and detect the status of the other station.

(Effects of the Invention) As described above, according to the present invention, by providing a means for storing the address of a token frame sending station, that is, an active station, and a means for responding to an inquiry about the active station from any station, Each station in token passing can detect the status of other stations, and there is no need to configure various protocols in the upper layer to monitor the status of the other station.This reduces the burden of protocol processing on the upper layer, and eliminates problems at low cost. This has the effect of providing a reliable data communication system.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the positioning of a data communication monitoring processing device according to an embodiment of the present invention and a token bashing bus, and FIG. 2 is a block diagram of a conventional token bashing bus. In the figure, (1) is a token bashing bus, (11) to (
14) is a station, (101) is a data communication monitoring processing device, (
112) is a serial data transmitting/receiving section, (113) is a data processing section, (114) is a current memory, and (115) is a basic memory. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In a local area network that uses a token bashing bus method as an access control method, frames for all addresses sent on the bus are received, and for inquiry frames, response data frames are sent to the source address after predetermined data processing. A data transmitting/receiving unit that transmits to a station, a memory that stores the address of the station that sent the token frame, and a designated station that stores the address of the station that sent the token frame in the memory in response to an inquiry frame from an arbitrary station that inquires whether the designated station is active. 1. A data communication monitoring processing device comprising: a data processing unit that performs data processing to send a response data frame with contents indicating activation when the address matches the address, and deactivation when the address does not match.