JPH04192835A - Data exchange system - Google Patents

Abstract

PURPOSE:To prevent the double investment for development by using an existing no-procedure support program as it is even in the group environment. CONSTITUTION:In a server 1, an RS232C port 11 and a pass-through device 12 exist, and a work station 2 is constituted of an RS232C redirector 21, a communication buffer 22, and a no-procedure support program 23. In such a state, when a personal computer for supporting a no-procedure terminal is utilized under the group environment, an existing program contained in the personal computer can be utilized as it is without altering it. In such a way, a useless development investment becomes unnecessary.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a data exchange system suitable for use when personal computers supporting non-procedural terminals are used in a group environment.

(Prior Art) Conventionally, to use a non-procedural terminal on a personal computer, a program supporting a non-procedural protocol is created, and it is connected to a serial input/output port, such as R323.
Communicating with other non-procedural terminals via the 2C port is
It was always. This can be set up in a group computing environment (
R5 when applied to group environment, groupware environment)
The 232C port exists in the server, and it is conceivable that each workstation can use this server in common.

The above-mentioned method usually requires interaction between a workstation and a server, so it has the disadvantage that programs for supporting non-procedural protocols, conventionally prepared on personal computers, cannot be used as is.

(Issue [1i] to be solved by the invention) As mentioned above, according to the conventional example, when using a non-procedural support program existing on a personal computer in a group environment, there are problems such as not being able to use it as is. there were.

This invention has been made in view of the above circumstances, and allows existing programs built into the personal computer to be used as they are without modification when using a personal computer that supports non-procedural terminals in a group environment. The purpose is to provide a data exchange system for

[Structure of the Invention] (Means for Solving the Problems) The data exchange system of the present invention includes a serial input/output port, a plurality of workstations connected via the serial input/output port, and a server for sending the generated data to another workstation; redirection means for redirecting an input/output request to a serial input/output port according to a non-procedural terminal program to the workstation; and redirection by the redirection means. buffer means for buffering an appropriate number of input/output requests received and data received through the serial input/output port; The present invention is characterized by providing a pass-through means for exchanging data with the buffer means (Function) The present invention provides a serial input/output interface, such as an R5232C interface, on the workstation side in a group environment of personal computers. By providing a redirecting means for redirecting, a buffering means for buffering data between the redirecting means and the server, and further providing a pass-through means for transmitting and receiving data between the R5232C port on the server side.

This allows existing non-procedure terminal support programs to run as they are on the workstation side.

This has the advantage that existing non-procedural support programs can be used as is in a group environment, and unnecessary development investment is not required.

(Example) Embodiments of the present invention will be described below using the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, numeral 1 is a server, numeral 2 is a workstation, and numeral 3 is a LAN (local area network) line connecting these. Workstation 2 is
Although only one is shown in FIG. 1, it is assumed that there are multiple in the system.

The server 1 includes an R3232C port 11 and a pass-through device 12, to which requests to use the R3232C port 11 arrive from a plurality of workstations 2.

The pass-through device 12 sends and receives data to and from the R5232C port 11, and sends and receives the sent and received data to and from a communication buffer 22 in the workstation 2, which will be described later. The workstation 2 includes an R5232C redirector 21, a communication buffer 22, and a non-procedural support program 23. The R8232C redirector 21 has a function of redirecting input/output requests (I10 requests) to the R5232C port 11 issued by the non-procedural support program 23. Further, the communication buffer 22 has a function of storing input/output requests redirected by the R8232C redirector 21, and also storing data (received data) from the pass-through device 12 of the server 1 and passing it to the R3232C redirector 21.

FIG. 2 is a flowchart showing the operation of the embodiment of the present invention. In the figure, reference numeral A is a step for issuing an input/output request to the R5232C port 11, and processes an input/output request from the non-procedural support program 23. Reference numeral B is a step that redirects this input/output request, and performs the role of stealing the request and passing the data to the next step C (to the communication buffer 22 that controls it). Reference numeral C represents a step of storing (buffering) transmitted and received data in the communication buffer 22 up to a certain unit (delimiter).

The code is a step for data communication, and the server 1 (
pass-through equipment fIt12) and workstation 2 (
Data communication is performed with the communication buffer 22).

Reference numeral E is a step for transmitting and receiving data to and from the R8232C port 11, and data is transmitted and received on the server 1 in full duplex.

The operation of the embodiment of the present invention will be described below.

First, in the workstation 2, an input/output request (I10 request) to the R5232C port 11 is issued by the existing non-procedural support program 23 (step A).

This input/output request is received by the R8232C redirector 21 and redirected (step B). Here, from the non-procedure support program 23, R3232C
It appears that an input/output request was issued to port 11.

The request received by the R3232C redirector 21 is
The information is stored in the communication buffer 22 up to a certain unit (delimiter unit here) (step C).

This buffering in the communication buffer 22 is performed in order to increase the line efficiency of the LAN line 3.

Now, if the request stored in the communication buffer 22 is an output request (transmission request) from the non-procedural support program 23, the request is sent to the pass-through device 12 of the server 1 in units of delimiters (step D). In contrast, the request stored in the communication buffer 22 is the input request (
If the request is a reception request), the data received up to a certain unit is passed to the non-procedural support program 23 one byte at a time (up to the delimiter), for example. The pass-through device 12 issues an actual input/output request to the R3232C port 11,
The transmitted and received data is exchanged with the communication buffer 22 (step E).

Although the present invention has only been described as an embodiment without a procedure,
This includes, but is not limited to, basic procedures, ES
The same method can be applied to the C procedure (bi-sync procedure) and the like.

[Effects of the Invention] As detailed above, according to the present invention, an existing non-procedural support program can be used as is even in a group environment, thereby preventing double investment in development.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a flow chart showing the operation of the embodiment of the present invention. 1... Server, 2... Workstation, 3...
・LAN line, 11...R3232C port (serial input/output port), 12...pass-through device, 21.
...R5232C redirector, 22...communication buffer, 23...non-procedural support program. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 2

Claims (1)

[Claims] The computer includes a serial input/output port, a plurality of workstations connected via the serial input/output port, and a server that sends data generated at one workstation to other workstations. and redirecting means for redirecting input/output requests to said serial input/output port according to a non-procedural terminal program to said workstation, and input/output requests redirected by said redirecting means and received through said serial input/output port. In addition to providing buffer means for buffering an appropriate number of data, the server is provided with pass-through means for transmitting and receiving data to and from the serial input/output port, and for transmitting and receiving data to and from the buffer means of the workstation. A data exchange system characterized by the following.