JPS6238640A - Terminal equipment for data communication - Google Patents

Abstract

PURPOSE:To prevent setting error and to reduce installation man-hour of a terminal equipment by providing a setting means setting optionally plural predetermined communication speeds, a discrimination means discriminating the communication speed and a nonvolatile storage means storing the communication speed so as to set automatically the communication speed of the data communication terminal equipment CONSTITUTION:A processor 2 extracts a communication speed from a memory 5 at the initial setting after power is applied and a communication speed is set to a sample timing generating section 3. When a communication data informed from a S/P conversion section 1 is coincident with a transmission data sequence for polling, the set communication speed is discriminated to be a communication speed set by the primary station side, an infinite time is set to a time supervisory section 4 and the discriminated communication speed data is stored in the memory 5. The succeeding data communication is executed in the discriminated communication speed at the same time. An automatic communication speed discriminating function is acted at the new installation or replacement of the data communication terminal equipment in this way and the discriminated communication speed data is stored in the nonvolatile memory 5.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a data communication terminal device in a data communication system using a polling/selecting system.
This invention relates to a data communication terminal device in which the secondary station automatically determines and sets the communication speed set by the secondary station (control station).

(Prior Art) As a data communication method, a polling/selecting method is widely used as a method for controlling a plurality of terminal devices connected to one line. The polling/selecting method has a primary station and a secondary station, and the primary station has the initiative in controlling transmission.

That is, the primary station issues polling to the secondary station at regular intervals and constantly monitors the status of the secondary station.

On the other hand, in order for the primary station and the secondary station to perform data transmission normally, the control procedure and synchronization method 9 communication speed must be the same for the primary station and the secondary station. Among these, the control procedure and synchronization method are fixed for each system, and the communication speed is determined by system throughput, line usage fees, etc., so even within the same system, the optimum value is set for each line or for each primary station. It is common to do so. For example, with a modem,
The line for data communication between A branch and B branch is 1200B/
S, within the same store as the primary station, use 480 as an internal line.
Set the communication speed as 0B/S.

Here, the primary station, for example, the terminal controller, generally has a speed setting switch for each line.
Communication speed can be set relatively easily by operating a switch for each line.

On the other hand, in systems with various online data communication terminals such as secondary stations, such as financial systems and securities systems, due to the large number of types of terminal devices and the diversification of networks, the communication speed setting depends on the type of terminal device. There are various types, and each communication speed is set to suit the line each time a new installation is performed, a terminal device is replaced due to a failure, and the communication speed is changed.

(Problems to be Solved by the Invention) However, the data communication terminal device having the above configuration has the following problems when setting communication speeds individually.

A person is required to set the communication speed. This is normally done by the manufacturer's maintenance personnel or an operator, but since this requires knowledge of how to set each terminal device, there is a possibility that the settings may be made incorrectly. Furthermore, depending on the terminal device and how it is used, setting the communication speed may not necessarily be possible with a simple operation. For example, many terminal devices require removing the device cover, removing the control board, and setting the communication speed using a switch inside the board, making it difficult to set up.

The present invention eliminates the above-mentioned problems and provides a data communication terminal device that automatically determines and sets the communication speed set at the primary station when the terminal device is newly installed or maintained or replaced. be.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a data communication terminal device that performs data communication with a control station using a polling/selecting method. a setting means that can arbitrarily set a plurality of communication speeds;
) determining means for determining the communication speed set by the control station by comparing the input communication data obtained by the communication speed set by the setting means with a predetermined code; and (C) determining the communication speed set by the control station; and non-volatile storage means for storing the communication speed.

(Function) According to the present invention, since the data communication terminal device is configured as described above, the technical means works as follows.

The setting means operates to arbitrarily set a predetermined communication speed in the system. The determination means compares the communication data obtained from the control station at the set communication speed with a predetermined code, such as a polling transmission code, to determine whether the communication speed is the one set at the control station. to work. That is, the determining means repeatedly sets the communication speed by the setting means until the communication data and the transmission code match, and when they match (that is, when polling has been correctly received), the determined communication speed is stored in the memory. The data is stored in the file and used for subsequent data communication. In this way, the communication speed can be easily set by automatically determining and setting the communication speed when installing a new device or maintaining or replacing the device, and at the time of startup, the communication speed data can be read out from the storage means and set. Therefore, there is no need for automatic determination processing, and the device can be put into operation quickly. Therefore, the problems of the prior art described above can be solved.

(Embodiment) FIG. 1 is a block diagram of a communication control section of a data communication terminal device showing an embodiment of the present invention. In the same figure, l is 1
Serial/parallel converter (hereinafter referred to as S/P converter) that converts serial communication data from the next station into parallel data; 2 is a processor that controls the entire device; 3 is a communication speed setting from processor 2; S/P converter 1
a sample timing generator that generates a sampling timing signal for sampling communication data;
4 is a time monitoring unit that notifies the processor 2 that a predetermined time has elapsed at predetermined intervals according to the time setting from the processor 2; 5 is a nonvolatile memory that stores communication speed setting data under the control of the processor 2; .

In this embodiment, it is assumed that the following matters are predetermined between the primary station and the data communication terminal device prior to data communication with the primary station.

(a) Communication speed variable range is 1200B/8.2400B
/34800 B/S.

(b) The polling transmission time is 3 seconds.

(c) The transmission data for polling is, for example, a HEX code of 20.20.20.20.05.

Next, the operation will be explained with reference to the flowchart shown in FIG.

1. At the time of initial setup when the power is turned on, the processor 2fd
The communication speed data is taken out from the memory 5 and the communication speed is set in the sample timing generator 3 (S1, S2). Note that a predetermined value of communication speed data is written in the memory 5 in advance. In addition, the processor 2 creates a time value for polling reception based on the time interval for polling transmission in section (b) above, and sets the time value in the time monitoring unit 4 (S3).
. S/P Hen N8 Evil 1 samples the communication data using the sampling timing signal from the sample timing generator 3 and processes it. 2 (S4). The processor 2 determines whether or not this communication data matches the transmission data sequence in section (c) above (S5).
. As a result, if they do not match, the processor 2 determines whether there is a notification from the time monitoring unit 4 indicating that the set time has elapsed (s6).

As a result, if there is no notification, the processor waits for a notification (communication data) from the S/P'& switching unit 1 and a notification from the time monitoring unit 4. If the processor 2 receives a notification of the passage of time from the time monitoring section 4, it determines that the current communication speed setting is not the communication speed set at the primary station, and then sends a different communication speed to the sample timing generation section 3. Set (37-510).

This operation is repeated within the communication speed range determined in the top of (a) until the communication data notified from the S/P converter 1 matches the transmission data sequence in the above (c). As a result, if the communication data notified from the S/P converter 1 matches the data sequence in section (c) above, the processor 1 determines that the set communication speed is the communication speed set on the primary station side. , sets an infinite time to the time monitoring unit 4, and stores the determined communication speed data in the memory 5 (Sl
l, S12). At the same time, subsequent data communication is performed at the determined communication speed.

In this manner, when a data communication terminal device is newly installed or replaced, the automatic communication speed determination function is activated, and the determined communication speed data is stored in the nonvolatile memory 5. After the power is turned on thereafter, the communication speed data f is retrieved from the memory 5 and the communication speed is set, so the communication speed is determined without the automatic communication speed determination function working.

(Effects of the Invention) As explained above, according to the present invention, by automatically setting the communication speed of a data communication terminal device, it is possible to prevent setting errors and reduce the number of steps required to install the terminal device. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a flowchart explaining the operation of the embodiment of FIG. ■...Serial/parallel converter (S/P converter) 2
...Processor 3...Sample timing generation section 4...Time monitoring section 5...Memory

Claims (1)

[Scope of Claims] A data communication terminal device that performs data communication with a control station using a polling/selecting method, comprising: (a) a setting means that can arbitrarily set a plurality of predetermined communication speeds; (b) ) a determination means for determining the communication speed set by the control station by comparing input communication data obtained by the communication speed set by the setting means with a predetermined code; (c) communication determined by the determination means; A data communication terminal device comprising: non-volatile storage means for storing speed.