JPH07245639A - Interface equipment - Google Patents

Abstract

PURPOSE:To select a driver/receiver automatically by discriminating automatically a type of an interface used for a data terminal equipment. CONSTITUTION:The user connects a data terminal equipment 17 to a 50-pin common connector 11 via a cable 16. At the application of power to the data terminal equipment 17 and the interface equipment, a CPU 14 controls a resistance measurement section 18 to measure a resistance between each pin and ground. The CPU 14 discriminates a type of the interface used for the data terminal equipment 17 connecting to the common connector 11 and applies changeover control to a switch 15 based on the result of discrimination thereby selecting a proper driver/receiver 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interface device for accommodating various data terminals.

[0002]

2. Description of the Related Art FIG. 2 shows the configuration of a conventional interface device.

In FIG. 2, the interface device is 50
Pin common connector 21, multiple drivers / receivers 2
2, an interface control unit 23, a CPU 24 that controls and manages the entire apparatus, and a driver / receiver changeover switch 25 that selectively connects one of the driver / receiver 22 between the common connector 21 and the interface control unit 23.
A and 25B are provided, and the common connector 21 has a cable 26.
The data terminal 27 is connected via.

Next, the operation of the above embodiment will be described.
In FIG. 2, the user connects the data terminal 27 to the cable 26.
To the 50-pin common connector 21 via the
The receiver changeover switch 25 is set and the appropriate driver / receiver 22 is selected.

As described above, even in the above-mentioned conventional interface device, various data terminals can be connected by manually setting the changeover switches 25A and 25B.

[0006]

However, in the above-mentioned conventional interface device, there is the trouble that the interface must be manually set.
There is a problem that connection cannot be made unless the user recognizes the interface of the data terminal 27.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide an interface device in which the interface of a data terminal is automatically discriminated and the driver / receiver selection is automated. .

[0008]

In order to achieve the above object, the present invention provides a common connector to which various data terminals are connected, a plurality of drivers / receivers of various interfaces corresponding to the various data terminals, and the driver. Based on the measurement result of the resistance value measuring unit for measuring the resistance value between each pin and the grant of the common connector Then, the interface of the data terminal connected to the common connector is discriminated, and the control means for controlling the driver / receiver changeover switch to select an appropriate driver / receiver according to the discrimination result.

[0009]

According to the present invention having the above structure, the user can automatically determine the interface of the data terminal by simply connecting the data terminal to the common connector and selectively connect the appropriate driver / receiver to the data terminal. .

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configuration of an embodiment of the present invention.

In FIG. 1, the interface device is 50.
Pin common connector 11, multiple drivers / receivers 1
2, an interface control unit 13, a CPU 14 that controls and manages the entire apparatus, a driver / receiver changeover switch 15 that selectively connects one of the driver / receiver 12 between the common connector 11 and the interface control unit 13, and the common connector 11. A resistance value measuring unit 18 for measuring the resistance value between the pin and the ground is provided, and a data terminal 17 is connected to the common connector 11 via a cable 16.

Next, the operation of the above embodiment will be described.
In the above embodiment, the user connects the data terminal 17 via the cable 16 and turns on the data terminal 17 and the interface device. After that, the CPU 14 controls the resistance value measuring unit 18 to measure the resistance value between each pin of the 50-pin common connector 11 and the ground. Based on this measurement result, the interface of the connected data terminal 17 is discriminated and the changeover switches 15A and 15B are controlled to select an appropriate driver / receiver 12.

As described above, according to the above-described embodiment, when the data terminal 17 is connected to the common connector 11, the appropriate driver / receiver 12 is automatically selected, so that the user can select the interface of the data terminal 17. It has an advantage that it can be connected without being aware of it.

[0014]

As is apparent from the above embodiment, the present invention measures the resistance value between each pin of the common connector and the ground by the resistance value measuring section, and based on this measurement result, the common connector is connected. Since the interface of the data terminal can be automatically discriminated, the troublesome setting is eliminated, and the interface of the data terminal can be connected without the user being aware.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of an interface device according to an embodiment of the present invention.

FIG. 2 is a schematic block diagram of a conventional interface device.

[Explanation of symbols]

 11 50-pin common connector 12 driver / receiver 13 interface control unit 14 CPU 15 driver / receiver changeover switch 16 cable 17 data terminal 18 resistance value measurement unit

Claims (1)

[Claims] 1. A common connector to which various data terminals are connected, a plurality of drivers / receivers of various interfaces corresponding to the various data terminals, and a driver / switch for switching the driver / receiver corresponding to the interface of the data terminal. A receiver changeover switch, a resistance value measuring unit for measuring the resistance value between each pin of the common connector and the grant, and an interface of the data terminal connected to the common connector based on the measurement result of the resistance value measuring unit. Then, the interface device comprising a control unit that controls the driver / receiver changeover switch according to the determination result and selects an appropriate driver / receiver.