JPH0618329B2 - Terminal control method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a terminal control system capable of switching a data communication line connecting a plurality of devices in a multipoint system at an arbitrary position.

With the progress of socio-economic activities and widespread area, the weight of data communication in the field of information processing is increasing year by year. Generally, in Japan, this data communication is generally regarded as "a method in which a communication line is connected to a computer and data processing and data transmission are performed integrally".

Further, normally, this data communication system is composed of a center computer, a communication network and a data terminal device. A data terminal device in this data communication system is a device that is connected to a center computer through a data communication line, a terminal control device, and a communication line network and inputs / outputs data. For example, a financial terminal device is an example of these. can give.

The data line system between the data terminal unit and the terminal control unit has a point-to-point system in which two terminal units are always connected by a dedicated data line, or some terminals with a small amount of data. Equipment 1
There is a multipoint system that connects to a book line.

In particular, financial terminal devices, which are expected to be installed more and more in the future, are generally connected by the multipoint method.

However, in the case of this method, for example, if a failure occurs in one line, all the connected terminal devices become unusable. Therefore, there is a particular demand for the development of a method of relieving them.

[Problems to be solved by conventional technology and invention]

As a conventional technique, a data communication system connecting financial terminal devices will be described as an example.

FIG. 3 shows a system diagram for connecting financial terminal devices by the multipoint method.

The flow of information at each branch point of the financial terminal device group 3 (hereinafter, a plurality of terminal devices is referred to as a financial terminal device group in this example) shown in FIG. 3 is represented by a terminal control device (hereinafter referred to as TC) 1 ， 1
Only the communication with a and 1b is possible, and the direct communication between the financial terminal device groups 3 is impossible.

There are roughly two types of connection modes of the multi-point method, a mode shown in Fig. 3 (1) and a mode shown in Fig. 3 (2), and Fig. 3 (3) is shown in Fig. 3 (2). It is one of the variants.

The form of FIG. 3 (1) is a form in which the line b ′ from one TC1 and the two lines b and c are switched and used by the switching device 2. For example, one of the lines b and c is a failure. If so, it is possible to switch to another one for use.

In the configurations of (2) and (3) of FIG. 3, one line b is connected to two TC1s.
It is a mode that is used by switching and connecting to a, 1b or TC1 and adapter 5 (hereinafter referred to as MA5). For example, TC1a or TC
If 1 is a failure, it can be used by switching to TC1b or MA5.

The communication lines a, a ', and d are lines connected to the center computer (not shown) side, which are mainly provided by the Electric Power Corporation, and the lines b and c are dedicated lines.

Also, TC1,1a, 1b is a device for controlling and monitoring the financial terminal group 3, and the terminating resistor 4 is for adjusting the characteristic impedance of the lines b, c seen from TC1,1a, 1b and MA5 side to be constant. It has a value such as 100 ohms.

MA5 is a part that controls the interface conversion between the communication line d and the line b, and is connected to a spare TC (not shown) installed on the side of the center computer (not shown) to the financial terminal group 3
Connect.

In the financial terminal device group 3 connected in each of the above-mentioned forms, for example, when a failure occurs in the middle of the line b connecting the financial terminal device group 3 in the form of FIG. The entire group 3 becomes unusable, which causes great inconvenience to users of the financial terminal group 3.

This is because the line system configuration cannot be configured flexibly.

[Means for solving problems]

An object of the present invention is to realize a new terminal control system that solves the above problems, and the problem is that a plurality of terminal control devices are connected to a host computer and a line is connected to each terminal control device. In a system in which a plurality of terminal devices are connected through the multi-point system via a multi-point system, and a line termination has a terminating resistor, when a failure occurs, the terminal device connected downstream from the failure occurrence point of the failure occurrence line A switching means is provided for switching connection to a line that does not operate, and when a failure occurs, disconnects the terminating resistor that is connected to the line that has not failed, and replaces the terminating resistor with the failure location of the failed line. A terminal control method is characterized in that a terminal device connected to a further downstream is connected and a terminal control device that controls the terminal device is switched and operated.

[Action]

For example, a switching means having a terminating resistor is installed between a more important terminal device and another terminal device in a group of terminal devices connected to one line by the multipoint method, and a failure occurs in the middle of the line. If it occurs, the terminating resistor connection route is switched at the same time as the line is switched.

That is, the line can be switched in the middle of the line, and a flexible line system configuration can be provided to rescue an important terminal device in case of emergency.

〔Example〕

The gist of the present invention will be specifically described below with reference to the embodiments shown in FIGS.

FIG. 1 shows an embodiment of a line system configuration according to the present invention, and FIG. 2 shows an embodiment of a line switching device according to the present invention. In addition, the same symbol indicates the same object throughout the drawings.

In the present embodiment, when the terminal device group 3b becomes unusable, the terminal device group 3a is set to have a greater social impact (for example, cash dispenser), and the terminal device group 3a is relatively more social than the terminal device group 3b. It is assumed that the terminal device has a small influence degree (for example, a device capable of relatively easily performing business processing by another method).

The terminal device group 3a of this embodiment is connected to the line e and the line f, and is normally connected to the center computer (not shown) via TC1a, 1b and the communication lines a, a '. It is assumed that the communication is performed with the terminal device group 3b.

Further, 6 is a line switching device for performing switching connection as a switching means, and as shown in FIG. 2, normally, terminals A1 and A2 (connection terminals to the line e) and terminals C1 and C2 (connection to the line g) are connected. Connecting terminal)
Are connected to each other, and terminals B1 and B2 (connection terminals to the line f) are connected to a resistor R2 (100 ohms in this embodiment, which corresponds to the terminating resistor 4).

In the above system configuration, when exchanging data with the center computer (not shown) under the control and monitoring of TC1a, a failure such as disconnection of the line occurs at point h, and lines e and g When it is confirmed that the data cannot be transferred, SW1 to SW
6 (assuming that this forms one interlocked SW) is connected to terminals B1 and B2, and line g and line f are connected.
By switching to the control / monitoring of TC1b, the terminal device group
Rescue 3b.

Needless to say, even if the TC 1a becomes inoperable for some reason, the important terminal device group 3b can be rescued by the same switching.

〔The invention's effect〕

According to the present invention as described above, it is possible to provide a flexible system configuration in which an important terminal device can be rescued even if a line failure occurs.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an embodiment of a line system configuration according to the present invention, FIG. 2 is an embodiment of a line switching device according to the present invention, and FIG. 3 is a multipoint financial terminal device. A system diagram for connecting and is shown. In the figure, 1,1a, 1b are TCs, 2 is a switch, 3,3a, 3b are terminal devices, 4 is a terminating resistor, 5 is an MA, and 6 is a line switching device.

Claims (1)

[Claims] 1. A system in which a plurality of terminal control units are connected to a host computer, a plurality of terminal units are connected to each terminal control unit through a line in a multipoint system, and a termination resistor is provided at the line termination, When a failure occurs, a switching means is provided to connect the terminal device connected downstream of the failure occurrence point to the failure-free line, and when a failure occurs, connect to the failure-free line The terminal resistor connected to the terminal device connected downstream from the fault occurrence point of the faulty line is connected in place of the terminating resistor, and the terminal control device for controlling the terminal device is switched and operated. Characteristic terminal control method.