JPS6249746A - Method for controlling transmission control procedure - Google Patents

Abstract

PURPOSE:To lighten the load of a host computer, by performing data communication control by using a procedure controlling table by a table managing program. CONSTITUTION:A table managing program 21 starts from an idle state (line 0/row A) as an initial status. When a transmission request is produced from a CPU, the program 21 processes the sequence defined by line 0/row B and the status is set to a response waiting status after data transmission. When the phenomenon of data reception takes place under this condition, the program 21 performs the process of line 1/row C and returns to the initial status. When abnormal time monitoring is detected under the status of response waiting after data transmission, the program 21 performs the process of line 1/row D and returns to the initial status.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for controlling transmission control procedures in a data communication control device.

[Technical background of the invention]

A conventional data communication control system was configured as shown in FIG. 4, for example. In the same figure, ■ is the host computer (C
PU), ■ is a data communication control unit.

■ is a transmission line, and 2) is a channel input/output line. The data communication control device ■ includes a channel control section ■ and a transmission control section 0.
, a communication control section (2), and an internal memory that stores a procedure control program (2) and line information (3). The procedure control was mainly performed by the procedure control program (2) while referring to the line information (9).

[Problems with background technology]

With the conventional procedural control described above, lower-level computers (microcomputers) that have various procedures and upper-level computers (minicomputers) that are often connected often have to modify programs on their own side to make connections, and the modification specifications must be managed.

The drawback was that it required a large load when updating the version of the operating system (OS).

[Purpose of the invention]

It is an object of the present invention to eliminate the above-mentioned drawbacks of the conventional system, to facilitate connection and correspondence with lower-level computers having various procedures, and to reduce the load on the host computer.

[Summary of the invention]

The object of the present invention is achieved by providing a communication control unit of a communication control device with a procedure control table that defines various necessary control sequences and its management program, and performing control using this table.

[Embodiments of the invention]

FIG. 1 is a block diagram showing a data communication system including one embodiment of the present invention. In the same figure, 0) is the host computer (CPU), (3) is the transmission line, (A) is the channel input/output line, ■ is the channel control unit, 0 is the transmission control unit, and (12) is the invention of the present invention. Data communication control equipment in (
17) is a communication control unit, (19) and (20).

(21) is each part constituting the communication control unit, (19) is line information, (20) is a procedure control table, and (21) is a table management program, which are stored in the internal memory. Of these, the transmission control unit (6) is a part that transmits/receives data to/from the transmission line
C, LRC, CRC) and communication control code management. The channel control unit (2) performs management between the communication control device (12) and the CPU via the channel output line (A).

Line information (19) defines information (diagnosis time value, trial number value, communication control code) necessary for executing procedures for each line.

The procedure control table (20) is a table of transmission control procedures, and has a structure in which the procedures can be executed by the CPU line information (19). The table management program (21) refers to the procedure control table (20) according to the transmission/reception request from the CPU (2) and the state of the transmission control procedure, and performs the processing instructed by the table. The procedure control table (20) is arranged as illustrated in FIG. 2, and is controlled by a status (22) indicating the current state of the procedure and a factor (23) indicating an occurring event.

The table determined by the status and factors contains data (
That is, commands, command auxiliary information, new status) are defined. The command defines data output/data input/input data investigation/command output to the transmission control device/transmission control device status investigation/diagnosis, etc., and the command auxiliary information includes output data information/
W inspection data/output commands/investigation status/diagnosis values are defined, and in the new status, the procedure control table (20
) defines the following statuses:

Figure 3 shows a simple example of a procedure control table.
The status indicating the current state of the procedure is idle and the state of waiting for a response after data transmission, and the factors indicating the occurrence event are idle, transmission request, data reception, and time monitoring over, and these statuses and factors are This shows an example of the contents of the table specified by .

An example of the operation of the table management program (21) using the procedure control table as described above is as follows. The table management program (21) first starts from an idle state (row 0-column A) as an initial status. When a transmission request is generated from the CPU, the sequence defined in row 0 and column B is processed, that is, command: data transmission, command auxiliary information: transmission data from the CPU, command: time monitoring,
Status: Processes status 1, and the status becomes Waiting for a response after sending data. When a data reception event occurs in this state, the table management program (21) processes the 1st row and C column, that is, command: hexagonal data investigation, command auxiliary information: acknowledgment data, command: input data investigation, command auxiliary information. :Negative response data, Command: Notification of completion of transmission to CPU, Command auxiliary information: Processing result, Status: Processes status O and returns to initial status. If an abnormality is detected in the time monitoring while the status is waiting for a response after sending data, processing of one matrix is performed, that is,
Command: Notification of completion of transmission to CPU, command auxiliary information: Abnormal termination Status: Processes status 0 and returns to initial status.

〔Effect of the invention〕

The present invention is as described above, and data communication control is performed by a table management program using a procedure control table. Therefore, even in a post computer that needs to support various procedures, the procedure control table only needs to be created. This has the effect of making it possible to support new methods and apply existing procedures to systems that incorrectly identify them, making management easier.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a system including an embodiment of the present invention, FIG. 2 is a diagram showing some details of FIG. 1, FIG. 3 is a diagram showing a specific example of FIG. 2, and FIG. This figure is a block diagram showing a conventional example in contrast to FIG. 1. 1: Computer, 3: Transmission line, 5: Channel control unit, 6: Transmission control unit, 12: Data communication control device, 17: Communication control unit, 20: Procedure control table, 21: Table management program.

Claims (1)

[Claims] In a data communication control device that has a channel control unit, a communication control unit, and a transmission control unit and is set between a computer and a transmission line, the communication control unit includes a procedure control table that defines various necessary control sequences, and a procedure control table that defines various necessary control sequences. 1. A method for controlling a transmission control procedure, comprising: providing a management program, and performing control using the procedure control table using the management program.