JPS62120141A - Token transmission system - Google Patents

Abstract

PURPOSE:To allow a station to take part in the token bus of a new station by allowing the station already participated in the token bus to give a new participation instruction by manual input or a keyboard input of a terminal equipment. CONSTITUTION:When a token is given in the order of a route such as station 2a station 2b station 2c - station 2a and a station 2d is participated newly, a new participation instruction 33 is written in a token frame 31A from an optional station among the stations 2a, 2b, 2c, 2d, 2e and 2f. A station receiving the said new participation instruction 33 gives the token to the next station and also given the new participation instruction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a token transmission system that allows a new transmitting/receiving station to enter a token bus of a transmission system in which a plurality of transmitting/receiving stations are connected.

[Conventional technology]

FIG. 3 is a format diagram of a token frame used to make an inquiry to each transmitting/receiving station (hereinafter referred to as station 5) in order to newly enter a conventional token transmission system. To receive a token as a transmission right, a token frame is used for passing the token, and 32 is a window display for permitting new entry.Next, the operation will be explained according to the processing flow diagram of FIG.

First, tokens are passed between each transmitting/receiving station one after another in a fixed order.

When one station receives the token (step IS), this station executes internal processing (step 2S) and sends out a token frame (step 3S). And the number of times this token frame is sent is n
A window is displayed once per session, and permission for new entry is granted.

Here, the station desiring to enter detects a token frame 31 from a higher-ranking station to a lower-ranking station, and furthermore, if a window display 32 is being performed, following the passing of the token, the station is notified of its joining. Send a frame for

If there is no window display 32, entry is not possible and the user is forced to wait until the window display 32 detects the token.

Immediately after the station that sent the token detects a frame to notify entry (step 4S)
, the destination to bus the token to is the new station (
Step 5S). The above completes the entry of the new station.

[Problem that the invention seeks to solve]

The conventional token transmission method is as described above, so a newly joining round station must join by monitoring the window display once every n times, and if n is small, Although it is easy to enter, there are problems such as the transmission throughput (transmission processing capacity) is reduced due to the window display, and the processing is complicated.

This invention was made to solve the above-mentioned problems, and it not only increases the throughput during normal times (from the time of entry), but also facilitates the procedure for newly performing station shadowing. The purpose is to obtain a token transmission method that can

[Means for solving problems]

The token transmission method according to the present invention allows a station that has already joined the token bus to issue a new entry command K by manual switch input or keyboard input from a terminal device connected to the station. It was designed to participate in the token bus.

[For production]

The new entry command in this invention can be issued by any station that has already entered tokens, and the station that receives this command is connected to the bus and is sending and receiving tokens. By passing a token to a station that does not exist, the station is forced to make a new entry.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 is a token bus that transmits burst data, 2a + 2b + 2c + 2c t2f is a station that has already joined this token bus l and is currently transmitting and receiving tokens, 2d is a station that is about to join, and 2g is a station that is about to join. This is a station with no plans to participate. Further, 5 indicates a route through which the tokens are delivered to each of the stations 2a to 2f in the pre-allocated order.

Further, FIG. 2 is a format diagram of a token frame 31A for new entry in the token transmission of the present invention, in which a new entry command 33 is written.

The operation will be explained below.

As shown in Fig. 1, when the tokens are passed in the order of stationum → station 2b → station 2C → station 2e → station 2f → stationum, if station 3d is to newly join, station 2a + 2b + 2c +2a Write new entry command 33 into token frame 31A from any station in s2f. This new entry order 3
The station that received 3 passes the token to the next station, and at the same time passes the new entry command again.

For example, if the new entry command 33 is sent from the station 2a, the token frame 31 will be sent to the next station 2b4 which received the token, and the station 2c.
A new entry command 33 is written in A, and this token 7 frame 31A is sent out. Station 2c transmits this token frame 31A to station 3dl'lj. Since station 3d is a station that makes a new entry, after receiving the token, it passes the token and new entry command 33 to station 2e.

Similarly, station 2f sends a new entry command 33 to station 2g, but since station 4g does not make new entry, it does not receive the token. At this time, due to some error procedure, station 2f sends the token and new entry command 33' to station 2a again. After that, station 2f does not send any tokens to station 2g. Also, the station 2a that received the token and new entry command 33
sends only the token to station 2b.

The above procedure enables the new entry of System 3c.

In the above embodiment, the new entry command 33 is sequentially passed to the stations, and the new entry command sending station,
In the above embodiment, the station 2a erases the new entry command 33 at the end, but the new entry command 33 may be sent to all stations at once using broadcast communication.

〔Effect of the invention〕

As described above, according to the present invention, when a specific station wants to newly join the token bus, it can be done by issuing an entry command from any station that has already joined. So,
In addition to being able to transmit data without reducing throughput at all, except when new entries are made as described above, the process for new entries is simple and reliable entry can be achieved. effective.

[Brief explanation of drawings]

FIG. 1 is a block connection diagram of a token transmission system according to an embodiment of the present invention, FIG. 2 is a format diagram of a token frame, FIG. 3 is a format diagram of a conventional token frame, and FIG. 4 is a diagram of a conventional token processing system. 70-FIG. 1 is a token bus, 2a t2b +2c +2c p
2! is the station that is participating, 2d is the station that is about to participate, 2g is the station that is not participating, 31A
is a token frame, and 33 is a new entry command.

Claims (1)

[Claims] In a token transmission method in which a plurality of transmitting/receiving stations are connected to a token bus and tokens are passed to each of the transmitting/receiving stations in a pre-allocated order, a token is transferred from a transmitting/receiving station that has already joined the token bus. A token transmission method characterized in that an entry command is written in a token frame, and a transmitting/receiving station that receives this entry command is newly entered into the token bus.