JPS61258547A - Data transmission system - Google Patents

Abstract

PURPOSE:To apply the titled system to a hierarchical data transmission system by providing the 1st step sending data from a data processor to a gate way, the 2nd step sending data from a gate way to another gate way and the 3rd step sending data from the gate way to the data processor. CONSTITUTION:A data transmission request is issued to a low-hierarchy terminal station Ski making a call from a data processor Hki of a step 1, block data is sent to a low-hierarchy terminal station Sko and the 1st reception data is sent to a gate way GWk. In the 2nd step, the 1st reception data subjected to protocol conversion is sent from the gate way GWk to a calling high-hierarchy terminal station MSk and the 2nd reception data sent to the high-hierarchy terminal station MSL is supplied to a gate way GWL. In the 3rd step, the 2nd reception data subjected to protocol conversion from the data way GWL is supplied to the low-hierarchy terminal station SLO, sent to the reception low- hierarchy terminal station SLj, and the 3rd reception data is supplied to the data processor HSLj. Thus, the data is sent from the data processor HSLi to the data processor HSki.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to data transmission in which block transmission is performed in a hierarchical data transmission system in which a plurality of lower layer circular data transmission paths and one upper layer circular data transmission path are connected by a gateway. It is related to the method.

BACKGROUND OF THE INVENTION FIG. 11 is a diagram showing a well-known annular data transmission system. Each data processing device H8°~H8,,
are connected via a circular data transmission line DW via terminal stations T1 to T in order to mutually exchange data. Block transmission is common in such data transmission systems. Block data is transmitted in a frame structure as shown in FIG. F is a flag sequence, DA is an address field, C is a control field, ■ is an information field, and FC3 is a frame check sequence.

Here, the information field I is composed of an address section A and a data section. Address part A consists of the destination (original) address. The destination address is created by the transmitting terminal station T, ~T, which transmits data, and is created by the terminal station T, ~T that should receive the data.
The source address is the address of the transmitting terminal station T, ~T, , created by the receiving terminal station T, ~T, . Block data having the frame structure shown in FIG. 2 is transmitted between the terminal stations T, -T7, and the data processing bags W HS + -H8, respectively.

Information in information field I is exchanged between them.

Next, as an example, the operation when transmitting data from the data processing device H3 to the data processing device H34 will be described. The data processing device H3 provides the terminal station TI with the address of the terminal station T4 and information on the data to be transmitted, and issues a transmission request.

The terminal station T completes the address field DA and the information field (2) using the received information, and sends block data having the frame structure shown in FIG. 2 to the data transmission line DW. When the terminal station T4 receives the block data, it gives the address and data of the terminal station T+ to the data processing device H34.

Problems to be Solved by the Invention In the data transmission system as described above, as the number of connectable data processing devices H3,-)Is increases, the data transmission speed becomes slower. Connected data processing device H3,-
As the number of H3,1 increases, the amount of data transmitted increases, so
In order to prevent the transmission speed from decreasing in this system, a data transmission line DW with a high transmission speed must be used. If a high-speed data transmission path DW is used, the entire system becomes very expensive. Furthermore, in such a system, the entire system depends on one data transmission path DW, so if an abnormality occurs here, the entire system will be affected.

A layered data transmission system solves this problem. In other words, the system includes a plurality of lower-layer annular transmission lines and connects them with an upper-layer annular transmission line. In this system, the amount of data transmitted in the lower layer and the amount of data transmitted in the upper layer are reduced compared to the above-mentioned system. Furthermore, in this system, one data transmission system is constructed for each data transmission path, so even if an abnormality occurs in one data transmission path, the effect on the entire system is small.

However, conventionally, a data transmission method in a hierarchical data transmission system has not yet been established.

An object of the present invention is to provide a data transmission method that can be applied to a layered data transmission system.

Means for Solving the Problems The data transmission system of the present invention provides a data transmission system for a plurality of lower layer terminal stations S, 0
A plurality of lower layer annular data transmission paths SWI to SW connecting between the lower layer terminal stations S, and a plurality of upper layer annular data transmission paths MDW connecting the plurality of upper layer terminal stations H5 to H3 are connected to the lower layer terminal station S. A gateway GW, -GW that connects ~S, o and the upper layer terminal stations H3+~H5.

lower layer terminal station 3 in a layered data transmission system connected with
H5 between data processing devices connected to 11~Sff1n
A method for performing block transmission of 1 to H,,11,
From the data processing device Hki, which is the transmission source, to the gateway GW via the lower layer circular data transmission path SW.

a first step of transmitting data to the gateway GW via the upper layer circular data transmission path MDW, a second step of transmitting data from the gateway GW to the gateway GW, and a second step of transmitting data from the gateway GW to the lower layer circular data transmission path SW. and a third step of transmitting the data to the data processing device HLJ which is the transmission destination, and in the first step, the lower layer terminal connected to the gateway GW from the data processing device Hki which is the transmission source to the lower layer terminal station Ski. Station S. address and gateway GW
Upper layer terminal station MS connected to I.

and the address of the lower layer terminal station SLj, and transmit data from the lower layer terminal station Sk□ to the lower layer terminal station SkQ.
The block data is transmitted to the lower layer terminal station SkO using the address as the destination address, and the first reception data received at the lower layer terminal station Sk0 is given to the gateway GW11, and in the second step, the gateway GW receives the first reception data. The data is protocol-converted, the block data is transmitted from the upper layer terminal station M S k to the upper layer terminal station MSL using the address of the upper layer terminal station MSL as the destination address, and the second received data received at the upper layer terminal station 1vi S t is In the third step, the gateway GW performs protocol conversion on the second received data, and transmits the second received data to the lower layer terminal station S. The block data is sent from the lower layer terminal station S1. to the lower layer terminal station SLj using the address of the lower layer terminal station SLj as the destination address. The third reception data received by the lower layer terminal station SLJ is provided to the destination data processing device HLJ.

By providing transmission data including the addresses of the lower layer terminal station and upper layer terminal station on the data transmission path and the address of the lower layer terminal station to be received, to the lower layer terminal station making the call from the destination data processing device, Block data is transmitted from the originating lower layer terminal station to the lower layer terminal station via the lower layer circular data transmission path, the first gateway performs protocol conversion on the first received data given from the lower layer terminal station, and the upper layer circular data Block data is transmitted from the upper layer terminal station that makes the call to the upper layer terminal station that is to be received via the transmission path, and the second gateway performs protocol conversion on the second received data given from the upper layer terminal station.
Block data is transmitted from the lower layer terminal station to the receiving lower layer terminal station via the lower layer circular data transmission path, and the third received data is provided from the receiving lower layer terminal station to the destination data processing device.

In this way, data transmission in a hierarchical data transmission system becomes possible.

Embodiment FIG. 1 is a diagram showing the configuration of an embodiment of a hierarchical data transmission system in which the present invention can be implemented. The data processing devices H1l to H1n are connected to the lower ring data transmission path S.
It is connected to lower layer terminal stations 311 to Sln connected to W,. Other data processing devices H21 to H, ll, H
3,~H,,l,...,H□1~Hin+...
・、H、.

~Hj n + . ~ S3
A...+ S i I ” S i n +...
+Sjl~Sjm+...+Sll+ ""
' S n n respectively. Each lower N circular data transmission path SW I''-3W.

are the lower layer terminal stations Sl+1 to Sm1 connected to each
1 to one end of gateways GW, GW, and I, respectively. The other end of each gateway GW, ~GW is connected to the upper layer terminal station MS, ~MS, which is connected to the upper layer circular data transmission path MDW. The gateways GW, ~GW perform protocol conversion between the lower layer and the upper layer, and connect the two layers.

In a hierarchical data transmission system with such a configuration, data transmission within the lower layer annular data transmission path SW+'' SW, and data transmission between the lower layer annular data transmission path SW, to SWi via the upper layer annular data transmission path MDW. In data transmission between the lower layer annular data transmission paths SW, ~SW1, generally, the lower layer annular data transmission path SW, ~5W1
Since the amount of data to be transmitted is larger than that within 1, the upper layer annular data transmission path MDW is used to have a high transmission speed.

In the data transmission path of this system, block transmission is performed with a frame structure as shown in FIG. Flag sequence F indicates the beginning and end of this frame.

Address field DA indicates the address of the destination terminal station. Control field C contains a command or response, and link control is performed based on the information in control field C. Information field I consists of an address part A and a data part, and indicates the information to be transmitted.

Frame check sequence FC3 is used for bit error detection using a CRC check code.

In this embodiment, the above-mentioned information field I has the structure shown in FIGS. 3 and 4. FIG. 3 shows the structure of the lower layer block data transmitted on the lower layer circular data transmission path SW, -SW, and FIG. 4 shows the structure of the upper layer block data transmitted on the upper layer circular data transmission path MDW. The address part A of the information field I in the lower layer block data includes the destination (original) address S, and the data part includes the destination (original) addresses G, , GS. The destination (original) address S is the lower layer circular data transmission path S W +~S
These are the addresses of the lower layer terminal stations Sll to 8□, which are valid only for W. Destination (original) address GM is all data transmission path S
W, ~SW,, upper layer terminal station M S +~ valid in MDW
The MS11 address is the destination (original) address G, which is the lower layer terminal station Sll~Sln+321~S2n+ that is valid on all data transmission paths SW, ~SW,, MDW.
・This is the address of +5llI~S-.

The address A of the information field I in the upper layer block data includes the destination (original) address M, and the data D
source address GM, Gs and destination address G
Includes M and GS. The destination (original) address M is the upper layer terminal station MS, which is valid only on the upper layer circular data transmission path MDW, ~
Indicates the address of MS.

Next, the operation of this embodiment according to the present invention will be explained with reference to FIGS. 5 to 9. Here, it is assumed that transmission data is transmitted from the data processing bag ff1H, . to the data processing device HL, as indicated by the arrow in FIG.

First, the operation in step 1 will be explained. data processing equipment)
(The lower layer terminal station Ski, which makes calls from +11, has a 5th
Destination address S (Sk.) shown in Figure (a).

Information consisting of GM (MSk), cs (SLj) and data is given, and a data transmission request is issued. The originating lower layer terminal station Ski completes the block data frame as shown in FIG. 5(b), and sends the block data to the lower layer terminal station S6 based on the destination address 5 (Sko) in the address field DA. do. The lower layer terminal station S6゜ that received the block data is shown in Fig. 5(C).
The first received data of information field I of the block data is transmitted to the gateway GWk as shown in FIG.

In the second step, the gateway GW performs protocol conversion as shown in Figure 6, and generates the address of the upper layer terminal station MSL, which is the destination address M on the lower layer circular data transmission path MDW, from the destination address GM. do.

Then, a source address G is generated from the source address S, which is the address of the three originating lower layer terminal stations. Also, the source address G1. which is the address of the upper layer terminal station MSk that makes the call. I is generated. The first received data whose protocol has been converted in this way is sent from the gateway GWK to the originating upper layer terminal stations MS and K. At the originating upper layer terminal station MSK, as shown in FIG. 7, an address field DA of block data is generated with the destination address M, and the source address GM, Gs, the destination address G, .
An information field I is generated with GS and data. When a frame is generated, the block data is sent to the upper layer terminal station MSL. The upper layer terminal station M S t transmits the second received data shown in FIG. 7(C) to the gateway GWL.
give to

Moving on to the third step, the gateway GWL performs protocol conversion in order to send the second received data to the upper layer circular data transmission path SWL. Here, as shown in FIG. 8, the destination address S is generated from the destination address G5, and the destination address G, which becomes unnecessary,
4. Gs is deleted.

Then, as shown in FIG. 9, the second received data subjected to protocol conversion from the dataway GW is given to the lower layer terminal stations S, o, and the lower layer terminal stations S, o. The program data is transmitted from the receiving lower layer terminal station SL to the receiving lower layer terminal station SLj.
The third received data received by the data processing device H3tJ
given to.

In this way, data is transmitted from the data processing devices HSa to the data processing device H3Lj.

The contents transmitted to the data processing devices H5, , include the source address G. , Gs, and it is possible to determine from which data processing device the information just received was transmitted. Therefore, for example, if the received data is a request message for some data, it is possible to send response data to the data processing device H3ki that is the source of the request via the reverse route.

In addition, in this embodiment, the lower layer circular data transmission lines SWI~S
Data transmission within Wi and upper layer circular data transmission line MDW
There is data transmission via
At ffi,l, a transmission operation is performed according to the flow shown in FIG. In step n1, the lower layer annular data transmission path SW, ~SW lower layer terminal station Sll~51 with the same transmission destination
1l+ SKI~S2i+ . . . , it is determined whether the data processing bags H1l~H0 are connected to S□1~S□. If they are within the same lower layer circular data transmission paths sw and -sw, the process moves to step n2 and the destination address GM,
Address "00" is set in GS. In the next step n3, the destination address S is set. step n
If the data transmission is via the upper layer circular data transmission path MDW in step n4, the destination address S is set in step n4, and the destination address GM is set in step n5.

G is set. Step n3 and step n5
Next, the process moves to step n6, where the data to be transmitted is set, and in step n7, the lower layer terminal stations Sll to S'll'l
+ S21~52Il+ ...+ S m I
” A data transmission request is issued to S m n.

As described above, in this embodiment, the data processing device HI I" Hff1n, which is the transmission source, connects all data transmission paths SW
+~SW,, Destination address valid in MDW GM+G,
This is a system in which the above-mentioned protocol conversion is performed at the gateways GW to GW by simply adding and transmitting the data to the data to be transmitted, and data transmission is performed in a simple manner.

Furthermore, in order to improve the data transmission efficiency on the data transmission path SW, ~5Wll, and MDW, multiple information fields (■) containing data to be sent to the same destination address are combined into one.
When sending out one block of data, only the address of the first information field I may be converted, but
Since each information field I contains a source address G)l+Gs, there is no need to rely on the first source address M.

Effects of the Invention According to the data transmission method of the present invention, data transmission in a hierarchical data transmission system is possible, and many data processing devices can be connected with an inexpensive configuration without reducing the data transmission speed.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a hierarchical data transmission system according to an embodiment of the present invention, FIG. 2 is a diagram showing the frame configuration of block data, and FIG. 3 is a diagram showing a lower layer circular data transmission path. FIG. 4 is a diagram showing the configuration of the information field of block data to be transmitted. FIG. 4 is a diagram showing the configuration of the information field of block data transmitted on the upper layer circular data transmission path. FIG. 5 is from the data processing device H3ki to the gateway GW. FIG. 6 is a diagram for explaining the protocol conversion at gateway GW, and FIG. 7 is a diagram for explaining the transmission information from gateway GW to gateway GWL.
FIG. 8 is a diagram for explaining the protogol conversion at the gateway GW, and FIG. 9 is a diagram for explaining the transmission information from the gateway GWt to the data processing device H8.
FIG. 10 is a flowchart for explaining the data transmission operation of the data processing device, and FIG. 11 is a diagram showing the configuration of a conventional data transmission system.

Claims (1)

[Claims] A plurality of lower layer circular data transmission paths (SW_1 to SW_m) connecting a plurality of lower layer terminal stations (S_1_0 to S_m_n)
) and a plurality of upper layer terminal stations (HS_1 to HS_m).
S_1_0 to S_m_0) and the upper layer terminal station (HS_1
~HS_m) and the gateway (GW_1~G
A method for performing block transmission between data processing devices (H_1_1 to H_m_n) connected to lower layer terminal stations (S_1_1 to S_m_n) in a hierarchical data transmission system connected by W_m), in which the data processing device serving as the transmission source (H_k_i) via the lower layer circular data transmission path (SW_k) to the gateway (G
The first step is to transmit data to the gateway (GW_k) via the upper circular data transmission path (MDW).
a second step of transmitting data from the gateway (GW_L) to the gateway (GW_L); and a third step of transmitting data from the gateway (GW_L) to the destination data processing device (H_L_j) via the lower layer circular data transmission path (SW_L). In the first step, the transmission source data processing device (H_k
The lower layer terminal station (S_k_0) connected to the gateway (GW_k) from the lower layer terminal station (S_k_i) to the lower layer terminal station (S_k_i)
) and the address of the upper layer terminal station (MS_L) connected to the gateway (GW_L) and the lower layer terminal station (S_
The block data is transmitted from the lower layer terminal station (S_k_i) to the lower layer terminal station (S_k_0) using the address of the lower layer terminal station (S_k_0) as the destination address.
) The first reception data received at the gateway (GW_
k), and in the second step, the gateway (GW_k) converts the protocol of the first received data and sends it to the upper layer terminal station (MS).
The block data is sent from the upper layer terminal station (MS_L) to the upper layer terminal station (MS_L) using the address of the upper layer terminal station (MS_L) as the destination address.
) and received by the upper layer terminal station (MS_L).
The received data is given to the gateway (GW_L), and in the third step, the gateway (GW_L) converts the protocol of the second received data and sends it to the lower layer terminal station (S_L).
The block data is sent from the lower layer terminal station (S_L_0) to the lower layer terminal station (S_L_j) using the address of the lower layer terminal station (S_L_j) as the destination address.
L_j) and the third reception data received by the lower layer terminal station (S_L_j) is transmitted to the destination data processing device (H_L
_j). However, here, i and j are any integers from 1 to n, and k
, l is an arbitrary integer from 1 to m.