JP2002281049A - Information terminal system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically switch the line of a signal by receiving a control signal from an information terminal. SOLUTION: Information terminals 2,... which are respectively provided with input and output connectors 2a and 2b and an internal circuit 20 for receiving/transmitting a signal from a server 3 are connected by connecting wiring through an LAN cable 1, and branching devices 4 which are respectively provided with input and output connectors 4a and 4b connected to the LAN cable L1, input and output connectors 4c and 4d connected to the information terminal 2, and a relay 5 to be controlled by the internal circuit 20 of the information terminal 2 for disconnecting the information terminal 2 and for transmitting/receiving a signal to/from the next information terminal when any trouble is generated in one information terminal 2 or when the power of the information terminal 2 is not turned on.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information terminal system for connecting information terminals by wiring, and more particularly to an information terminal system that automatically switches signal lines by receiving a control signal from the information terminal.

[0002]

2. Description of the Related Art Conventionally, an information terminal system is shown in FIG.
As shown in (a), a plurality of information terminals 200,.
Is a LAN cable L100 connected to the server 300.
And are connected by wiring. Information terminal 2
00 denotes an input / output connector 200 as shown in FIG.
a, 200b, and an internal circuit 210 that sends out control signals and sends and receives signals from the server 300.

In the information terminal system configured as described above, when a signal is transmitted from the server 300, it is sequentially received from the information terminals 200,... Further, when a signal is transmitted from the information terminal 200 far from the server 300, the signal is received by the server 300 via the information terminal 200 arranged between the information terminal 200 and the server 300.

[0004]

However, in such a conventional information terminal system, any of the information terminals 200 arranged in the middle of the information terminals 200,. If a trouble occurs, signal transmission / reception becomes impossible, the power is not turned on, or the device is removed for device replacement, etc. There was a problem that the information terminal could not transmit and receive signals to and from the server.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide an information terminal system which automatically switches signal lines by receiving a control signal from an information terminal. And

[0006]

According to the present invention, there is provided an information terminal system comprising: an information terminal having an input / output connector and an internal circuit for transmitting a control signal and transmitting / receiving a signal from a server; An information terminal system connected by wiring over a cable, comprising an input / output connector connected to the LAN cable, an input / output connector connected to the information terminal, and an internal circuit of the information terminal, between the LAN cable and the information terminal. When a trouble occurs in one information terminal which is controlled or when the power of the information terminal is not turned on, the information terminal is separated from the next information terminal and a switch having a switching means for transmitting and receiving a signal is interposed. is there.

[0007] According to such an information terminal system, when one of a plurality of information terminals connected by crossover wiring is not functioning properly, a LAN cable is required. Even if a signal is input to the input / output connector connected to the terminal, the switching means of the branching device disconnects the information terminal and switches so as to transmit and receive a signal to and from the next information terminal. Can send and receive signals to and from the server.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an information terminal system according to the present invention will be described below in detail with reference to the drawings.

In the preferred embodiment of the information terminal system of the present invention, as shown in FIG. 1 (a), a plurality of information terminals 2,.
Are connected by wiring over a LAN cable L1 connected to the LAN. As shown in FIG. 1B, the information terminal 2 has input / output connectors 2a and 2b, and an internal circuit 20 for transmitting control signals and transmitting and receiving signals from the server 3. Further, between the LAN cable L1 and the information terminal 2, the input / output connectors 4a, 4b connected to the LAN cable L1 and the input / output connectors 2a,
2b, input / output connectors 4c and 4d connected by connection LAN cables L2 and L3, and an information terminal 2 controlled by an internal circuit 20 of the information terminal 2 when one information terminal 2 has a trouble or the information terminal 2 is turned on. When not in operation, the information terminal 2 is separated and a branching device 4 having a relay 5 which is a switching means for transmitting and receiving signals to and from the next information terminal 2
Intervening.

The relay 5 of the branching device 4 includes, for example, a switching contact 5c at the input / output connector 4a, a switching contact 5c 'at the input / output connector 4b, a contact 5m at the input / output connector 4c, and a contact 5m' at the input / output connector 4d. Are connected, the contacts 5b, 5b 'are connected to each other, and when a control signal is sent from the internal circuit 20 to the relay control circuit 50 connected to the internal circuit 20 of the information terminal 2 and the control line L4, The switching contacts 5c, 5c 'are connected to the contacts 5m, 5m', and if no control signal is transmitted, the switching contacts 5c, 5c '
′ Are connected to the contacts 5b, 5b ′.

In the information terminal system configured as described above, when a signal is transmitted from the server 3, first, the signal is input to the input / output connector 4 a of the branching device 4 closest to the server 3. The input signal is transmitted to the information terminal 2 via the switching contact 5c of the relay 5, the contact 5m of the relay 5, the input / output connector 4c of the branching device 4, the connection LAN cable L2, and the input / output connector 2a of the information terminal 2. Internal circuit 2
Sent to 0. When the information terminal 2 is functioning normally, the internal circuit 20 sends a control signal to the relay control circuit 50 of the relay 5 included in the branching device 4, so that the relay 5 connects the switching contacts 5c and 5c 'to the contacts. 5m, 5m '. Therefore, the internal circuit 20 sends the signal transmitted from the server 3 to the input / output connector 2b, and this signal is transmitted from the connection LAN cable L3 to the input / output connector 4b.
d → contact 5m ′ of relay 5 → switching contact 5c ′ of relay 5
→ The data is transmitted to the LAN cable L1 connected to the next branching device 4 via the input / output connector 4b. By such a relay operation of the branching device 4, signals transmitted from the server 3 are sequentially received from the information terminals 2,.

On the other hand, one of the information terminals 2,..., Which is connected by crossover wiring, is unable to transmit or receive a signal due to a trouble. When the power is not turned on or when the device is removed for device replacement or the like, the control signal is not sent from the internal circuit 20 of the information terminal 2 to the relay control circuit 50 of the relay 5 included in the branching device 4. The relay control circuit 50 connects the switching contacts 5c and 5c 'of the relay 5 to the contacts 5b and 5b'. Therefore, the server 3 input to the input / output connector 4a of the branching device 4
From the switching contact 5c of the relay 5 → the contact 5b of the relay 5 → the contact 5b ′ of the relay 5 → the switching contact 5 of the relay 5.
c ′ → Send to the LAN cable L1 connected to the next branch unit 4 via the input / output connector 4b of the branch unit 4.
As a result, a signal from the server 3 can be transmitted from the previous information terminal 2 (or the server 3) to the next information terminal 2 without passing through the information terminal 2 that has stopped functioning normally.

The same applies to the case where a signal is transmitted from the information terminal 2 to the server 3. The internal circuit 20 of the information terminal 2 sends a control signal to the relay control circuit 50 of the relay 5 of the branching device 4. For example, the switching contacts 5c, 5c of the relay 5
c ′ is connected to the contact points 5m, 5m ′, and when the information terminal 2 arranged in the middle of any of the information terminals 2,... Since no control signal is sent from the internal circuit 20 of the information terminal 2 to the relay control circuit 50 of the relay 5 of the branching device 4, the relay control circuit 50
Are connected to the contacts 5b, 5b '. As a result, a signal can be transmitted from the previous information terminal 2 to the next information terminal 2 (or the server 3) without passing through the information terminal 2 that has stopped functioning normally.

[0014]

As is apparent from the above description, according to the information terminal system of the present invention, a signal line is automatically switched between a LAN cable and an information terminal by receiving a control signal from the information terminal. In the case where an information terminal arranged in the middle of any of a plurality of information terminals connected by wiring is not functioning normally, it is connected to a LAN cable. Even if a signal is input to the input / output connector, the switching means of the branching device disconnects the information terminal and switches so as to transmit and receive a signal to and from the next information terminal, so that the next information terminal can be connected without changing the connection. Signals can be sent and received with the server.

[Brief description of the drawings]

FIG. 1 is a diagram showing a preferred embodiment of an information terminal system according to the present invention, wherein FIG.
(B) is a partial detailed view.

FIGS. 2A and 2B are diagrams showing a conventional information terminal system, wherein FIG. 2A is an overall block diagram, and FIG.

[Explanation of symbols]

 2 Information terminals 2a, 2b Input / output connectors 20 Internal circuits 3 Servers 4 Branch devices 4a, 4b, 4c, 4d ..... I / O connector 5 ......... Relay (switching means)

Claims (1)

[Claims] An information terminal (2,...) Having an input / output connector (2a, 2b) and an internal circuit (20) for transmitting a control signal and transmitting / receiving a signal from a server (3). LA
An information terminal system connected by wiring over an N cable (L1), wherein the LA cable is connected between the LAN cable and the information terminal.
Input / output connector (4a, 4b) connected to N cable
And an input / output connector (4c,
4d), when one information terminal is controlled by the internal circuit of the information terminal and a trouble occurs or when the power of the information terminal is not turned on, the information terminal is disconnected and a signal is transmitted to and received from the next information terminal. An information terminal system comprising a switch (4) having switching means (5).