JPH04133118A - Connection switching device for input/output device - Google Patents

Abstract

PURPOSE:To eliminate the need of a person's help and to prevent the malfunction caused at the time of connecting devices by energizing a circuit operating device for switching a contact of a connection switching circuit for constituting a connection switching device by only a power source from one sub-input/output device. CONSTITUTION:The device is constituted so that a main input/output device 11 having one port, and plural sub-input/output devices 15, 16 are connected and switched by a connection switching device 17 connected like an interface. The connection switching device 17 has two I/Os, and when the main input/ output device 11 and the sub-input/output device 16 are connected through the connection switching device 17, the power source does not go into the connection switching device 17. In such a state, when the sub-input/output device 15 is connected by the connector 13, the power source goes into the connection switching device 17, a connection switching circuit 19 operates, the input/output devices 11, 15 are connected, and the input/output device 11 and 16 are not connected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a connection device for input/output devices. The present invention also relates to a connection switching device for input/output devices that performs the switching.

[Prior Art] Conventionally, for example, the input/output device of a computer main body (commonly called an I10 device) and the input/output device of a peripheral device are connected, or the input/output devices of multiple peripheral devices are connected to one another with a connector. When connecting one input/output device to another input/output device, the switching method or switching device is shown in Figures 2 to 4. Figure 2 shows the most basic conventional input/output device. FIG. 2 is a block diagram illustrating a connection switching method. In this method, the connectors 3 and 3a that can be connected to the connector 2 are connected to the connector 2 of the input/output device A1, respectively, to the connection cables 4 taken out from the input/output device B5 and the input/output device C6, and the user By inserting the connector 3a and reconnecting the input/output device B5 and the input/output device C6, the input/output device A1
This is used to switch the connection with the FIG. 3 is a block diagram illustrating a connection switching device for input/output devices using a conventional switching device. This device connects the switching device 7 to an input/output device A1, an input/output device B5, and an input/output device C.
It was connected between 6 and 6. The switching device 7 is provided with a manual switch 8 consisting of a manual switching contact, and the user switches the connection by switching the manual switch 8. FIG. 4 is a block diagram of another conventional switching device for connecting input/output devices. In this device, a switching circuit 9 is installed in the switching device 7, and the switching circuit 9 is operated by a switching signal from the input/output device A1 to switch the connection between the input/output device B5 and the input/output device C6. I have to. The connection switching device shown in FIG. 4 automatically performs switching, and is technically the most advanced device.

[Problems to be Solved by the Invention] In the conventional connection switching methods and devices as described above, especially those shown in the conventional examples shown in FIGS. 2 and 3, the user has to decide and implement them. This requires additional effort, and furthermore, it is unavoidable that malfunctions may occur due to carelessness. Further, in the conventional example shown in FIG. 4, a circuit for determining the switching signal and issuing a command is required in the switching circuit, which poses a problem of complication of the circuit.

The present invention was made to solve the above-mentioned problems,
The object of the present invention is to provide a connection device for input/output devices that is free from malfunctions and is cost-effective by improving the switching circuit.

[Means for Solving the Problems] The input/output device connection switching device according to the present invention connects the main input/output device and two switches corresponding to the multiple switching contacts via a connection switching circuit composed of multiple switching contacts. A connection switching device that switches the connection with the open-type output device, in which a power terminal is led to the connection terminal with one of the open-type output devices of the two sub-input/output devices, and the power supply terminal is connected to the open-type output device It has a circuit operating means that is energized by mounting to switch the contacts of the multiple switching circuit.

[Function] In the present invention, the switching contact of the connection switching circuit is switched only for one of the two open output devices to be used by switching the connection with the main input/output device. A power supply terminal for the circuit operation means is provided and connected. Therefore, if only the other open type output device that is not equipped with this power supply terminal is connected to the connector, the circuit actuating means provided in the connection switching circuit will not operate. The expression output device is connected to the main input/output device. Therefore, if one of the above open type output devices is connected to the connection switching circuit in this state, the circuit operating means will be energized by the power from the power terminal, so this open type output device will become the main input/output device. At the same time as the connected state is established, the other open type output device is automatically disconnected while remaining connected to the connector. That is, in this state, the connection with the main input/output device is automatically switched from the other open type output device to one open type output device. Moreover, if the connector connection of one open type 8-force device is removed from this state, the connection of the other open type output device is returned to the beginning. Note that the terms (main) and (sub) added to the input/output devices, such as the above-mentioned main input/output device and open type output device, are named for convenience of explanation, and may not be particularly limited.

[Embodiment] FIG. 1 is a block diagram illustrating a connection switching device for input/output devices showing an embodiment of the present invention. Also, Figure 5 shows the first
FIG. 3 is a detailed circuit diagram of the connection switching circuit shown in the figure. As seen in FIG. 1, the main input/output device 11 has one port.
The connection and switching between the output device 15 and a plurality of (two in this case) open type output devices 15, 18 is performed by a connection switching device 17 that connects the output device 15, 18 in an interfine manner. Note that the main input/output device 11. Sub-generation output device 15. The sub-input/output device 16 and the connection switching device 17 are connected through connectors 12. Connector 1
3. This is done using the connector 13a. The connection switching device 17 has two l10 (input/output devices m>), and the main input/output device 11
When the open type output device WI6 is connected via the connection switching device I7, the connection switching device 17 is not powered on. When the open type output device 15 is connected with the connector 13 in this state, the connection switching device 17 is powered on, the connection switching circuit 19 that constitutes this operates, and the main input/output device 11 and the open type output device 15 are connected. At the same time,
The main input/output device A and the sub-generation/output device 16 are no longer connected.

This situation will be explained in detail using FIG. The connection switching circuit 19 is specifically composed of a relay circuit. That is, this relay circuit consists of multiple switching contacts, and is provided with a circuit operating device 20 as means for operating the relay circuit by being energized by an external power source to drive the switching contacts. FIG. 5 shows a case where connection switching of R5-232C is performed as an example. Note that R5-232C is known as an international standard, and many personal computers and communication devices have built-in interfaces made based on this standard. Therefore, the character codes such as SG, SD, RD, etc. of the terminals written on the connectors 12, 13.13a are R5 above.
-232C compliant name. The relay circuit is energized by the power supply, that is, when no current flows, the contact becomes the secondary output device 1.
It is falling towards the connection with 6.

However, when the secondary output device 15 is connected via the connector 13 in this state, the circuit operating device 20 is activated by the current from the power terminal (OV, 5V) of the secondary output device 15 provided in the connector 13. When energized, the sub-generation/output device 15 falls toward the connection with the main input/output device 11 . In this way, even if only the sub-generation/output device 16 is attached to the connection switching device 17 and remains connected to the main input/output device 11, the sub-generation/output device 15 to be connected next can be attached. For example, the sub-generation/output device 15 is automatically connected to the main input/output device 11. Therefore, even if the auxiliary output devices 15 and 18 are both attached, the connections of the auxiliary output devices can be easily switched by, for example, turning on and off the power supply circuit (not shown) provided in the open type output device 15. There are also secondary operational benefits, such as improved performance.

Note that the circuit operating device used as the circuit operating means for automatically switching the contacts shown in the above embodiments is not specifically limited.

[Effects of the Invention] As described above, according to the present invention, the circuit operating device that switches the contacts of the connection switching circuit constituting the connection switching device can be energized only by the power from one of the sub-product output devices. Therefore, connection switching between input and output devices can be performed without human intervention, which has the effect of preventing connection malfunctions. Furthermore, a connection switching device for input/output devices having a simple circuit and low cost can be obtained.

[Brief Description of the Drawings] Fig. 1 is a block diagram illustrating a connection switching device for input/output devices according to an embodiment of the present invention, and Fig. 2 illustrates a basic connection switching method for conventional input/output devices. FIG. 3 is a block diagram showing a connection switching device using a conventional switching device, FIG. 4 is a block diagram showing a connection switching device using another conventional switching device, and FIG. 5 is a block diagram showing a connection switching device using another conventional switching device. FIG. 2 is a detailed explanatory diagram of the connection switching circuit shown in the embodiment. In the figure, 11 is the main input/output device, 12.13.13a
15 is a connector, 15 is a sub-product output device, 1B is a sub-product output device, 17 is a connection switching device, 19 is a connection switching circuit, and 2o is a circuit operating device. Patent applicant: Oki Electric Industry Co., Ltd. Representative: Patent attorney: Muneharu Sasaki yl Tosencho Kinyaku block D diagram 1 sugar refinery #E accent #j! Around the mouth t1 and ya, the fifth factor of the customer's mouth is Taguchi.

Claims (1)

[Claims] Connection switching of an input/output device that switches connections between a main input/output device and two sub-input/output devices corresponding to the multiple switching contacts via a connection switching circuit consisting of multiple switching contacts. In the device, a power supply terminal is led to a connection terminal with one of the two sub-input/output devices, and is energized by attachment of the one sub-input/output device to connect the contacts of the multiple switching circuit. A connection switching device for an input/output device, characterized in that it has a circuit operation means for switching.