JPS61156943A - Network communication system - Google Patents

Abstract

PURPOSE:To improve the efficiency of expansion by transmitting the data of the last terminal unit to the intermediate and the first stations by a manner that the right-side switch of the intermediate unit is converted in the receiving status and left-side switch of the last unit is in transmitting status. CONSTITUTION:The system consists of the n-pieces of terminal units TE1, TE2,...TEn which are loop-connected. All the units less the first one TE1 are of identical constitution. the difference between the first unit TE1 and the rest is that the former does not have the left-side switch. Of the unit TE2, the left- side switch SWL2 is connected to the input-side coupling transistor T<2>1, and the right-side switch SWR2 is to the output-side coupling transistor T<2>0. Between these two transistors T<2>1 and T<2>0, a receiving circuit RV2, a reception processing circuit RC2, a transmission processing circuit SC2, and a driving circuit DR2 are connected. Accordingly, any dedicated transmission line is not necessary between the first and the last terminal units. Additionally, in case of expansion of the system, what is needed is only to connect another unit to the last one, and therefore the expansion work becomes of improved efficiency.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention aims to eliminate waste by excluding the transmission path connecting the first terminal and the last terminal in a network in which scattered terminals are connected to each other in a loop. Regarding network communication methods.

[Conventional technology]

FIG. 6 is a block diagram of a conventional communication system, and FIG. 7 is a time chart of data in each part of FIG.

In the loop network shown in Fig. 6, each terminal te1
, te2, ...te all have the same configuration.

For example, for terminal te, input coupling transformer t
, l and the output side coupling transformer t. Receiving circuit rv during 1
1, a reception processing circuit rcI, a transmission processing circuit SC, and a drive circuit dr are connected to each other.

First, the terminal te creates transmission bucket data a1 by its transmission processing circuit SC, and sets an end flag E at the end.
It is sent to tez with ND added (FIG. 7(A)).

The terminal te2 receives the above a through its reception circuit rVg (α in FIG. 7(B)), and if this al is data addressed to itself, it is taken in and processed by the reception processing circuit rCz. Then, this al and its own data b1 are attached with an end flag END, created as transmission packet data by the transmission processing circuit SCz, and sent to te via the drive circuit drz (FIG. 7(B)).

At the terminal te, the above a1 and bl are transmitted by the receiving circuit rv.
(β1 and β2 in FIG. 7(C)), and if these are addressed to itself, they are taken in and processed by the reception processing circuit rCn. Then, the transmission processing circuit SC1 inserts its own data C8 between al+bl and END, and the drive circuit dr
, and then sends it to the first terminal te (Fig. 7(C)).
.

This is transmitted to the first terminal t received by the receiving circuit rvl.
e, uses the reception processing circuit rcl to delete its own data a, and processes bl+cl if it is addressed to itself.

Then, in the transmission processing circuit SC1, the arrow γ in FIG. 4 leaves this bl and 01, and 12) If there is new data, it is inserted as β2, END is attached, and the next stage's te is
z (FIG. 7(A)).

In the prior art, each terminal inserts its own data in this way, causing the transmitted packet data to go around once, and deletes the previously inserted data when it returns, thereby forming a loop-like network.

[Problem that the invention aims to solve]

However, in the above-mentioned conventional technology, data transmission between the final terminal ten and the first terminal teI requires only one transmission path! ,.

β2 is required. Therefore, in the prior art, when constructing a loop network, the transmission line connecting the teI and teI is used! There was a problem in that 0.12 also had to be installed.

Furthermore, when adding a new terminal, this transmission path f,
, N2 must be removed once and then the additional terminal and the first terminal must be reconnected, resulting in a problem that the expansion efficiency is extremely poor.

[Means for solving problems]

According to the present invention, each terminal is provided with a left switch and a right switch for switching data input/output operations, and first, the right switch of the first terminal is set to the transmitting state, the left switch of the intermediate terminal is set to the receiving state, and the right switch is set to the receiving state. By switching the left switch of the last terminal to the transmitting state and the receiving state, the data of the first terminal is sent to the last terminal,
Next, the data of the intermediate terminal is transmitted to the first and last terminal by switching the right switch of the first terminal to the receiving state and the left switch of the intermediate terminal to the transmitting state, and then the right switch of the intermediate terminal is switched to the receiving state. A network communication system is provided, characterized in that data from the last terminal is transmitted to the intermediate and final terminals by switching the left switch of the last terminal to the transmitting state.

[For production]

In the method of the present invention, data can be transmitted in a loop by simply switching the transmission/reception status of each switch by providing a left switch and a right switch that can switch data input/output operations on each terminal. There is no need for a dedicated transmission line between the terminal and the last terminal, and therefore, when expanding the number of terminals, a new terminal can simply be connected to the last terminal, which improves the efficiency of expansion.

〔Example〕

Hereinafter, the present invention will be explained by way of examples with reference to the accompanying drawings.

FIG. 1 is a configuration diagram of a network communication system according to the present invention,
FIG. 2 is a time chart of the data shown in FIG. 1 and a connection state diagram of the switches.

The apparatus of FIG. 1 consists of n terminals TE loop-coupled to each other.
, , TEX, ... TE, and each terminal has the same configuration except for the first terminal TB. The difference between the first terminal TE and the other terminals is that the first terminal TE+ does not have a left-hand switch.

Alternatively, the left switch of TE may be fixed in the open state. In addition, in order to simplify the following operation explanation, n=
Case 3 is shown.

Taking the second terminal TE2 as an example, its device configuration will be explained as follows.

The terminal TE2 has a left switch 5WLz connected to the input side coupling transistors T, z, and a right side switch 5WRz connected to the output side coupling transistor T02, and a receiving circuit is connected between the input and output side coupling transistors TI "ITO". R'V2, reception processing circuit RC2, transmission processing circuit S
C2 and drive circuit DR2 are connected.

When the left switch 5WLz is connected to the input side coupling transistor TI'' on the lower side, that is, as shown by the solid line, it inputs data from the previous stage terminal TE, and the left side switch 5WLz inputs data from the previous stage terminal TE, as shown on the upper side, that is, the broken line. ', it outputs data from its own terminal TE and subsequent stage TEI...TEn to the previous stage TE.

On the other hand, when the right switch SWR2 is connected to the lower side, that is, the output side coupling transistor T (1") as shown by the solid line, it cooperates with the lower side connection 5WLz to transfer data from the previous stage TE to the subsequent stage TE3. Output and own terminal TE2
The data is outputted to the front stage TE in cooperation with the above-mentioned upper connection coupling transformer SWL, and further outputted to the rear stage TEA.

In addition, when the right switch 5WRz is connected to the upper side, that is, to the input side coupling transformer TI'' as shown by the broken line,
It cooperates with the upper connections sht and z to send data from the subsequent stage TEff to the previous stage TE.

The reception circuit RV2 receives data from the previous stage TE, and the reception processing circuit RC is a circuit that takes in and processes the received data if it is addressed to itself.

The transmission processing circuit SC2 creates its own data, and the drive circuit DR2 is a drive circuit for sending it to the line to the next stage.

Next, the operation of the apparatus shown in FIG. 1 having the above configuration will be explained based on FIG. 2 and FIGS. 3 to 5.

Figure 2 (A) (B) shows each part of Figure 1 (A) (B)
2 is a time chart of data, and the connection states of each switch SWR, etc. when each data is transmitted to each of the above-mentioned parts are shown corresponding to the time chart.

Unlike in the past, there is no direct transmission from TE3 to TE+, so the time chart in (C) does not exist.

First, the time. , turn the right switch SWR of the first terminal TE downward. Transmission processing circuit SC.

At this point, transmission packet data a1 is created and an end flag END indicating the end of the data is attached (FIG. 3). In this case, the right switch SWR is previously pushed down until time τ, as shown by the solid line (Figures 2 and 3).
Since it is connected to the output side coupling transistor T(1')
(Fig. 3), the data D1 consisting of the above a, and END (Fig. 2 (8)) is sent to the subsequent stage terminal TE2 via the drive circuit DR and the transformer T01 (Fig. 3).

Also, τ. to τ1, the left switch 5W of TE2
Since L2 is connected to the input side transformer TI2, it is connected to the input side transformer TI2, so it receives the signal from the receiving circuit RV, and if it is addressed to itself, it is taken in and processed by the reception processing circuit RC2. This a is τ. The signal from τ to τ is input to TE3 via the right switch SWR, which is tilted downward (FIG. 3).

At this time τ1, the first terminal T that has completed transmission
The right switch SWR of E, and the left switch 5WL2 of the terminal TEz, which received the above a, both fall upward (FIG. 2). Therefore, the line connecting TE and TEz, □
is connected to the input side coupling transformer TI' of TE and the output side coupling transformer To2 of TE2 (Fig. 4).
. For this reason, the data D2, which consists of S, +END, created by the transmission processing circuit SC2 of TE2 is sent to the line LI2 (Fig. 4), and is also sent to L23 via the 5WR2 lying downward (Fig. 4). Figure 4).

Therefore, this D2 = bl + END is received and processed by TE, , TE3 via input quadrant TI' of TE, via quadrant TI3 of TE3, respectively (FIG. 4).

On the other hand, at τ2 when transmitting data D2 of TE, TE2
Right switch 5WR2 and left switch 5 of TE3
WL3 falls upward (Figures 2 and 5).

Therefore, all the switches have fallen upward,
The data D3 consisting of the data CI created by the transmission processing circuit SC3 of the TE3 and the end flag ENDs is shown in FIG.
A) (B)) ,'r,3 is sent to L113 through switch 5WL3, and further sent to TE2 via TI''.
Processed within and then outputted from Kadrance T. ' (Figure 5) and enters the input transformer TI' via SWL2, L1□ and SWR.

During this time, TE2. has received an end flag END indicating that it has exited from the last terminal TIE. TE resets the switch to the initial state shown in FIG.

Therefore, the right switch of TE3! All switches except VR3 are in the down position (Figure 1).

The next τ3 to τ6 (Figure 2) are the above τ.

By performing the switching operations from to τ3, each terminal data is transmitted in a loop.

Note that the transformer and switch in the method of the present invention may be a photo coupler or a transistor, and the target data can be widely applied to audio, images, etc.

Furthermore, although the present invention has been described in the case where n=3, it is of course possible to realize a system with more terminals than n=3 using the same principle.

〔Effect of the invention〕

As described above, according to the present invention, by providing each terminal with a left switch and a right switch that can switch data input/output operations, data can be transmitted in a loop by simply switching the transmission/reception status of each switch. Therefore, there is no need for a dedicated transmission path between the first and last terminals, and therefore, when expanding the number of terminals, a new terminal can simply be connected to the last terminal, which improves the efficiency of expansion.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of the system of the present invention, Fig. 2 is a data time chart and a connection state diagram of the switches shown in Fig. 1, Figs. 3 to 5 are explanatory diagrams of the operation of Fig. 1, and Fig. 6 and FIG. 7 are explanatory diagrams of the prior art. TE+, TEz,...TE,...Terminal, SW
R+, 5WRz,...S A R11...Right switch, 籏L2. SWL:t, ...SWL,...
・Left switch, TI', TI'',...T
,''...Input side coupling transformer, TO', T'.',
...'ro 1... Output side coupling transformer, RV, ,
RV2,...RV,...receiving circuit, R
CI, RCz,..., RC,...reception processing circuit, SC+, SCz,...SC,...transmission processing circuit, OR. OR,...OR,...drive circuit, LZ2,
LZ:l...Connection line.

Claims (1)

[Claims] Each terminal is equipped with a left switch and a right switch to switch data input/output operations. First, the right switch of the first terminal is set to the transmitting state, the left switch of the intermediate terminal is set to the receiving state, the right switch is set to the transmitting state, and the last switch is set to the transmitting state. The data from the first terminal is transmitted to the last terminal by switching the left switch of the terminal to the receiving state, respectively, and then the right switch of the first terminal to the receiving state and the left switch of the intermediate terminal to the transmitting state. By switching, the data of the intermediate terminal is transmitted to the first and last terminal, and furthermore, by switching the right switch of the intermediate terminal to the receiving state and the left switch of the last terminal to the transmitting state, the data of the last terminal is transmitted to the intermediate terminal. A network communication method characterized by transmitting information to the first terminal.