JPH0478249A - Communication control method - Google Patents

Abstract

PURPOSE:To reduce a response time without enforcing the load of the hardware by storing only a header part at first when a communication text is once stored in a memory, taking preceding its analysis over other processing, starting the transmission preparation and executing the storage of the information part. CONSTITUTION:A transmission command means 32 of a communication control processor 13 starts a DMAC 20 to raise a transmission command to the DMAC 20 so that a text stored in a local memory 14 is divided into a header part 25a and an information part 25b and they are to be transferred to a local memory 18, then a transmission command means 33 gives a transmission command to a communication control processor 17. The DMAC 20 receiving the transfer command executes the transfer of data corresponding to the header part 25a of the text, and a transfer end notice means 35 gives a transfer end notice to the processor 17. Moreover, the local memory 14 reads the information part 25b and transfers it to the memory 18. A text 25 stored in the memory 18 is sent to a public network 6 via a line adaptor section 15.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a communication control method for a communication control device that relays messages consisting of a header section and an information section.

(Prior Art) In recent years, with the development of various communication networks, systems have been constructed that perform various processing while transmitting data between a host device and a plurality of terminal devices. In such a system, a communication control device is used to control data (telegram) transmission between the host device and each terminal device. When it is desired to transmit data, the terminal device first transmits the data to this communication control device without directly accessing the host device. When the communication control device receives the data, it transmits the data to the host device. The terminal device and the communication control device are usually connected by a dedicated line, and a dedicated buffer (local memory) for storing data is provided in the communication control device, so it is not possible to directly access the host device. This eliminates the situation of waiting for a line to become available, which can occur when using a network, and allows for more efficient operation. Similarly, when transmitting data from the host device to the terminal device, the data is once transmitted via the communication control device.

FIG. 2 shows a block diagram of a conventional computer system.

In the figure, a communication control device 1 transmits information between a terminal device 2 and a host device 3, and is connected to the terminal device 2 via a communication line 5 and to the host device 3 via a communication network 6. There is.

In the communication control device 1 , a first line corresponding section 11 is connected to the communication line 5 . A first communication control processor 13 and a first local memory 14 are connected to the first line correspondence section 11 via an internal data bus 12.

On the other hand, a second line support section 15 is connected to the communication network 6. A second communication control processor 17 and a second local memory 18 are connected to the second line correspondence section 15 via an internal bus 16.

A memory data transfer mechanism (DMAC: Direct Memory Access Controller) 20 is connected to the first and second local memories 14 , 18 via a data bus 19 .

The first and second line correspondence sections 11.15 are input terminals that perform signal matching (serial/parallel conversion, etc.) and information transmission/reception control between the communication line 5, the communication network 6, and the internal bus 12.16, respectively. It is an output interface. 1st and 2nd
The communication control processor 13.17 performs transmission and reception protocol processing between the terminal device 2 and the host device 3. First and second local memories 14.
18 are first and second communication control processors 1, respectively;
3.18 instructions and information transmitted between the terminal device 2 and the host device 3, such as a RAM.

The DMAC 20 includes first and second local memories 14.
This is to transfer information between 18 devices at high speed.

A communication control method in the communication control device 1 having the above configuration,
That is, data transmission between the terminal device 2 and the host device 3 will be explained with reference to FIG.

FIG. 3 is a time chart of a conventional communication control method.

Here, information (
An example of transmitting a message (telegram) will be explained below.

Here, before going into the explanation of FIG. 3, the structure of the message will be explained using FIG. 4.

FIG. 4 is a diagram showing the structure of a message sent by boat.

As shown in the figure, the message 25 is composed of a header section 25a and an information section 25b.

The header section 25a is a section consisting of communication control information, such as protocol information such as information transmission destination and data amount. By analyzing the contents of this header section 25a, it is possible to understand how this message is handled. The information section 25b is a section containing information to be sent to the other party.

Now, returning to FIG. 3, first, when the terminal device 2 intends to transmit information to the host device 3, it activates the first communication control processor 13.

The first communication control block, processor 13, which has been activated,
Set the first line support unit 11 to a state where it can receive messages,
It waits for a message to be transmitted from the terminal device 2 (step Sl). When the message is transmitted from the terminal device 2, the first line correspondence section 11 stores this message in the first local memory 14 (step S2). When this storage is completed, the first line correspondence section 11 issues a reception end notification to the first communication control processor 13 (step S3). 1st
When the communication control processor 13 receives this notification of completion of reception, the communication control processor 13 transmits the message 25 stored in the first local memory 14.
After performing reception setting processing such as analysis of the header section 25a (step S4), the DMAC 20 is activated, that is, the first
A transfer instruction is issued to transfer the message 25 stored in the local memory 14 of the second local memory 18 to the second local memory 18 (step S5). Upon receiving the transfer instruction, the DMAC 20 reads the message 25 from the first local memory 14 and writes it into the second local memory 18, that is, performs DMA transfer (step S6).

When the DMA transfer is completed, the DMAC 20 issues a transfer completion notification to the first communication control processor (step S
7). Upon receiving this transfer completion notification, the first communication control processor 13 issues a transmission instruction to the second communication control processor 17 (step S8). The second communication control processor 17 that receives this transmission instruction executes a so-called transmission setting process, such as analyzing the header part 25a of the message 25 stored in the second local memory 18 (step S9). When the transmission setting process is completed, the second communication control processor 17 sets the second line correspondence section 15 to a transmittable state (step 5IO), and transfers the message 25 stored in the second local memory 18 to the second communication control processor 17. The data is transmitted (transmitted) to the public network 6 via the line support unit 15 (step 511).

The message 25 transmitted to the public network 6 is received by the host device 3.

A message is transmitted from the terminal device 2 to the host device 3 through the procedure described above. Note that similar processing is performed when the message 25 is transmitted from the host device 3 to the terminal device 2.

(Problem to be Solved by the Invention) Now, in the case of the communication control method explained in FIG. ), the processing capacity of the first and second communication control processors should be increased to execute reception processing and transmission processing at high speed, or the data transfer capacity of the DMAC should be increased and data transferred from the first local memory 14 to Only hardware measures such as shortening the transfer time to the second local memory 18 could be taken.

This has caused problems such as hardware development costs and increased costs.

The present invention has been made with attention to the above points, and an object of the present invention is to provide a communication control method that can shorten response time without imposing a burden on hardware.

(Means for Solving the Problems) The communication control method of the present invention stores a series of communication messages composed of a header section consisting of communication control information and an information section consisting of transfer information in a memory, and then In the case of transmitting the information to the memory, before storing the information part in the memory, only the header part is stored and the header part is analyzed first, and before storing the information part in the memory, the information part is This is to start preparations for transmitting the copy to the other party.

(Operation) The above method sends a series of communication messages consisting of a header section consisting of communication control information and an information section consisting of transfer information.
Once stored in memory, only the header part is stored first, analysis of the header part is preceded, and preparations for transmission to the other party are started. On the other hand, the information section is stored following the header section. Therefore, at the same time as storing the information part, the analysis of the header part is completed, and the message stored in the memory can be immediately transmitted.

(Embodiment) FIG. 1 shows a block diagram of a computer system according to the present invention.

In the figure, a communication control device 1 transmits information between a terminal device 2 and a host device 3, and is connected to the terminal device 2 via a communication line 5 and to the host device 3 via a communication network 6. There is.

In the communication control device 1 , a first line corresponding section 11 is connected to the communication line 5 . A first communication control processor 13 and a first local memory 14 are connected to the first line correspondence section 11 via an internal data bus 12.

On the other hand, a second line correspondence section 15 is connected to the communication line 6. A second communication control processor 17 and a second local memory 18 are connected to the second line correspondence section 15 via an internal bus 16.

A memory data transfer mechanism (DMAC: Direct Memory Access Controller) 20 is connected to the first and second local memories 14 , 18 via a data bus 19 .

The above configuration is the same as the conventional communication control device 1 previously described in FIG. 2. Therefore, duplicate explanations will be omitted as appropriate.

In FIG. 1, the first communication control processor 13 includes:
A transmission/reception control section 31 is provided.

The transmission/reception control unit 31 is provided with a transfer instruction means 32 and a transmission instruction means 33.

The transmission/reception control unit 31 executes processing related to message transmission between the terminal device 2 and the host device 3. The transfer instruction means 32 instructs the DMAC 20 to read out the message 25 stored in the first local memory 14 into two parts, a header part 25a and an information part 25b, and to transfer them to the second local memory 18. This is to issue a transfer instruction. The transmission instruction means 33 issues a transfer instruction to the DMAC 20 and, at the same time, issues a transmission instruction to the second communication control processor 17 to transmit the message 25.

On the other hand, the DMAC 20 is provided with a transfer end notification means 35. When the transfer end notification means 35 reads data corresponding to the header part 25a of the message 25 from the first local memory 14 and writes it to the second local memory 18, it directs the data to the second communication control processor 17. Telegram 2
A completion notification indicating that the transfer of No. 5 has been completed is issued.

Note that, like the first communication control processor 13, the second communication control processor 17 is also provided with a transmission/reception control section 36, a transfer instruction means 38, and a transmission instruction means 39.

Here, a communication control method in the communication control device I having the above configuration will be explained with reference to FIG.

FIG. 5 is a time chart of the communication control method of the present invention.

Here, a case where information (telegram) is transmitted from the terminal device 2 to the host device 3 will be explained as an example.

In the figure, the processes from step 321 to step S25 are the same as steps 81 to S5 previously explained in FIG. Therefore, here, the processing after step S26 will be explained.

As previously explained in step S5 of FIG.
Transfer instruction means 32 of communication control processor 13 of
AC20 (7) activation, that is, the message 25 stored in the first (7) 0-cal memory 14 is transferred to the header section 25a and the information section 2.
5b and issues a transfer instruction to divide the data into two parts and transfer them to the second local memory 18 (step 525), then the transmission instruction means 33 issues a transmission instruction to the second communication control processor 17 (step 525). step 526). The second communication control processor 17 that has received this transmission instruction waits for notification of the completion of transfer of the message 25.

On the other hand, upon receiving the transfer instruction, the DMAC 20 first transfers data corresponding to the header section 25a of the message 25 (step 527). When this transfer is completed, the transfer completion notification means 35 is activated and issues a transfer and transfer completion 1 notification to the second communication control processor 17 (step 528).
. The second communication control processor 17 that receives this transfer completion notification executes a so-called transmission setting process, such as analyzing the header part 25a stored in the second local memory 18 (step 529).

Now, upon issuing the transfer end notification, the DMAC 20 further reads out the information part 25b from the first local memory 14 and executes the transfer to the second local memory 18 (step 530).

During this period, the transmission setting process in the second communication control processor 17 is completed, and the second communication control processor 17
Set the line support unit 15 of the line to a transmittable state (step 531), and send the message 25 stored in the second local memory 18 to the public network 6 via the second line support unit 15 (step 531).
transmission) (step 532). This transmission is already in the second
The contents that have been transferred to the local memory 18 are sequentially transmitted.

While the contents of the second local memory 18 are being transmitted to the host device 3, the transfer in the DMAC 20 continues and eventually ends. Once this transfer is complete, the DMA
The transfer end notification means 35 of the C20 issues a transfer end notification to the second communication control processor 17 again (step 533).
), the transfer operation ends. Then, the second communication control processor 17 also completes the transmission of the contents of the second local memory 18, that is, the message 25.

A message is transmitted from the terminal device 2 to the host device 3 through the procedure described above. Note that similar processing is performed when the message 25 is transmitted from the host device 3 to the terminal device 2.

In this way, the second communication control processor 17
DM in parallel with communication setting processing such as analysis of 5a.
Since the transfer is performed by the AC 20, the overall processing time can be shortened by the time required for communication setting processing by the second communication control processor 17. Note that similar processing is performed when the message 25 is transmitted from the host device 3 to the terminal device 2.

The present invention is not limited to the above embodiments.

In the embodiment, the message 25 is divided into a header section 25a and an information section 25b.
Although the description has been made using a pair of header sections and information sections, the same processing can be applied, for example, when a plurality of header sections and information sections are provided and connected. In this case, the transfer instruction to the DMAC 20 is such that each header section and information section are read individually.

(Effects of the Invention) The communication control method of the present invention described above executes message transfer and processing by the communication control processor in parallel without imposing a burden on eight-doware, so that the communication control device receives the message. The time from input to output can be shortened.

[Brief explanation of drawings]

Figure 1 is a block diagram of a computer system according to the present invention, Figure 2 is a block diagram of a conventional computer system, Figure 3 is a time chart of a conventional communication control method, and Figure 4 is a configuration diagram of a general message. , FIG. 5 is a time chart of the communication control method of the present invention. DESCRIPTION OF SYMBOLS 1... Communication control device, 11... 1st line corresponding part,
13...first communication control processor, 14...first
local memory, 15... second line corresponding section, 17... second communication control processor, 18... second
20...Memory data transfer mechanism, 31.36...Transmission/reception control unit, 32.37...Transfer instruction means, 33.38...Transmission instruction means, 35...Transfer completion notification means. Patent applicant: Oki Electric Industry Co., Ltd. (Sakurai's communication! Il purchase f5 method Q time chart Figure 3 To Figure 4 Uninvented communication control method 0 Guimuchi type Figure 5 To

Claims (1)

[Scope of Claims] In the case where a series of communication messages consisting of a header section consisting of communication control information and an information section consisting of transfer information is once stored in a memory and then transmitted to the other party, the information section is Before storing the information part in the memory, only the header part is stored and the header part is analyzed first, and before the information part is stored in the memory, preparations for transmitting the information part to the other party are started. A communication control method characterized by: