JPH07129291A - Connecting device for bus - Google Patents

Abstract

PURPOSE:To accurately detect a bus not being connected by devising the arrangement of connecting lines of a connecting device for buses which connects plural components to a computer body in series and providing a terminating resistor which short-circuits two signal lines of components. CONSTITUTION:A computer connection part 2 and intermediate connection parts 3 and 4 are each provided with two signal lines 9 and 10, which are connected to signal lines of the components 6-8. The terminating resistor module 5 is provided with a signal line 5a and its terminal part is connected to signal lines 9a and 10a of the component 6. The other-end sides of the signal lines 9 and 10 of the computer connection part 2 are connected to a receiver 11 and a driver 13 in the computer main body 1. Therefore, when those connection parts are correctly connected to the components 6-8, the receiver 11 is corrected to the driver 13, so a low-level signal is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bus connecting device for connecting a plurality of components in series to a computer body, and more particularly to a bus connecting device capable of detecting a bus disconnection.

[0002]

2. Description of the Related Art In recent years, a bus connection method such as a SCSI bus has been proposed as a connection method for connecting a plurality of peripheral devices (components) to a computer body.

In this system, a bus signal is connected from a computer main body to a first component by a connecting means such as a cable, the bus signal is used in the component, and the bus signal can be directly sent to the next component. The bus signal is transmitted to the next component by the next connection means. In this way, a plurality of components are sequentially connected in series, and a termination resistor module is connected to the end of the bus to perform termination processing.

[0004]

In the bus connection method as described above, in order for the computer main body and the plurality of components to operate normally, all the components including the terminating resistor module are properly connected by the connecting means. However, the conventional bus connection method has a means for the computer main body to detect components even if the components are not properly connected by the connecting means or the terminating resistor module is not connected. It has a drawback that it cannot confirm that the connection is correct. Especially when the termination resistor module is not properly connected,
Since all the components often operate in an unstable state, it is difficult to judge from the operating state of the components that the terminating resistor module is not properly connected.

[0005]

SUMMARY OF THE INVENTION A bus connecting device of the present invention includes a computer connecting portion having two signal lines for connecting a receiver and a driver of a computer body to each of two signal lines of a component; A plurality of intermediate connection parts having two signal lines respectively independently connecting the two signal lines of the component, and a termination having one signal line for short-circuiting the two signal lines of the component And a resistance module.

[0006]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing a case where one of the intermediate connecting portions is not connected in the embodiment of FIG. 1, and FIG. 3 is an implementation of FIG. In the example, the terminating resistor module is not connected, and FIG. 4 is a block diagram showing that one of the components is not connected in the embodiment of FIG.

In FIG. 1, the component 8 is connected to the computer main body 1 by the computer connecting portion 2 and is connected to the component 7 by the intermediate connecting portion 3. The component 7 is connected to the component 8 by the intermediate connection portion 3 and is connected to the component 6 by the intermediate connection portion 4. Component 6 is
It is connected to the component 7 by means of an intermediate connection 4 and also to the termination resistor module 5 to form a termination. Therefore, the components 8 and 7 and 6 are connected in series with the computer body 1.

Computer connection 2 and intermediate connection 3
2 and 4 are respectively provided with two signal lines 9 and 10, which respectively lead to the components 6 ...
8 signal lines 9a and 10a. Further, the terminating resistor module 5 is provided with a signal line 5a, and its end is connected to the signal lines 9a and 10a of the component 6. Signal lines 9 and 1 of computer connection 2
The other end of 0 is connected to the receiver 11 and the driver 13 in the computer body 1, respectively. Therefore, when the computer connection 2 and the intermediate connections 3 and 4 as well as the terminating resistor module 5 are properly connected with the components 6 to 8, the receiver 11 is connected to the signal lines 9 and 10 and the signal lines 9a and 10a and the signal line 5a. Since it is connected to the driver 13, it detects a "low" level signal.

As shown in FIG. 2, if the intermediate connection 4 is not properly connected to the component 7, the signal line 9
Since and 10 are not connected to the signal lines 9a and 10a, respectively, the receiver 11 is not connected to the driver 13 and detects the "high" level signal by the action of the pull-up resistor 12.

As shown in FIG. 3, the terminating resistor module 5
Is not properly connected to component 7,
Since the signal line 5a is disconnected from the signal lines 9a and 10a, the receiver 11 is not connected to the driver 13 and the pull-up resistor 12 works to detect a "high" level signal.

As shown in FIG. 4, even when the component 7 is not connected, the signal lines 9 and 10 are respectively connected to the signal line 9.
The receiver 11 detects a "high" level signal because it is not connected to a and 10a.

[0013]

As described above, the bus connecting device of the present invention is connected to a computer connecting portion for connecting a computer body and components, an intermediate connecting portion for connecting two components, and a terminal component. Terminating resistor module is provided, and two signal lines are provided at the computer connecting portion and the intermediate connecting portion to connect with each of the two signal lines provided at each component, and one signal is provided to the terminating resistor module. By providing a line and connecting both ends to each of the two signal lines of the component, and connecting the two signal lines of the computer connection part to the receiver and driver of the computer main body respectively, the computer main body, the component and the computer connection 1 of the connection points between the connection part, the intermediate connection part and the terminating resistor module
Even if there is a connection point where the connection is insufficient, there is an effect that it can be detected in the computer main body.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a case where one of the intermediate connecting portions is not connected in the embodiment of FIG.

FIG. 3 is a block diagram showing a case where the terminating resistor module is not connected in the embodiment of FIG.

FIG. 4 is a block diagram showing a case where one of the components is not connected in the embodiment of FIG.

[Explanation of symbols]

 1 Computer Main Body 2 Computer Connection Section 3.4 Intermediate Connection Section 5 Termination Resistor Module 6/7/8 Component 5a / 9/10 / 9a / 10a Signal Line 11 Receiver 12 Pull-up Resistor 13 Driver

Claims (1)

[Claims] 1. A computer connection section having two signal lines for connecting a receiver and a driver of a computer main body to each of two signal lines of a component, and two signal lines of each of the two components. A bus connection comprising a plurality of intermediate connection parts each having two signal lines independently connected to each other, and a terminating resistor module having one signal line for short-circuiting the two signal lines of the component. apparatus.