JPS6326024A - Connector - Google Patents

Abstract

PURPOSE:To faciliate the section of pull up/down of a signal line connecting selectively at least one signal line having digital signal transmitted to either of a power supply having two kinds of potentials via a resistor and a switch. CONSTITUTION:A low potential supply terminal 9 and a high potential supply terminal 8 are provided to a main body 7 and a voltage is supplied to them by an external power supply. In throwing a slide type switch 10, either voltage is applied to one terminal 11 of a resistor mount section. A voltage applied to the main body 7 is applied to the other terminal of the resistor mount section via a resistor 2. Further, this voltage is applied to a signal line 5 and a connector 5 and also a target board. Even with a signal supplied in one wire of a flat cable 14 from a main body 6 in the floating state, a correct voltage is supplied to the target board. The similar effect is attained by employing a variable resistor 12 so as to vary the voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a connector, and particularly to a connector used between devices that input and output digital signals.

[Conventional technology]

Generally, in information processing systems and the like, a connector is used to connect a plurality of devices that input and output digital signals and to propagate the digital signals. however,
When a signal propagates between the devices, noise is added to the signal due to external factors, and the end of the signal line does not hold the same potential as when the signal was output, or the end of the signal line In this case, it is necessary to consider the case where the signal line becomes a floating state (intermediate potential) or the case where reflection occurs at the end of the signal line.

Therefore, in order to eliminate the above-mentioned problems and accurately propagate the signal when functioning the above-mentioned signal, it is necessary to
The pull-down resistor 3 in FIG. 4 or the pull-amp resistor 4 in FIG. 4(b) is placed within the device.

Device 2 operates normally only when signal 5 output from device 1 is at a low level. However, for example, assume that device 1 is a device under development and signal 5 is floating (intermediate potential). In this case, device 2 will not operate correctly.

In the above case, in the prior art, it was necessary to add a pull-down resistor 3 within the device 2 to make it appear as if the signal 5 were at the mouth level.

Further, the signal 5 output from the device 1 is at high level 2.
I feel refreshed. The reading device 2 is constant. When the purpose of use changes, such as when the signal 5 is used as a device, the device 2 In order for the device to work properly, a pull-up resistor 4 is added in the device 2, as if the signal 5 holds the same potential as that output by the device 1 and propagates to the device 2. It is necessary to

When changing the purpose of use of the device, the resistor 3 inside the device 2 must be removed and a new resistor 4 must be installed inside the device 2. This requires a great deal of effort when using the device for multiple purposes.

On the other hand, it is necessary to register a mounting location for the resistor 3 or 4 on the inside of the device, and in many cases, it is very difficult to provide that location when considering the board area of the device 2 and the like.

[Problems to be Solved by the Invention] When using a conventional connector, there are disadvantages in that a resistor must be installed in the connected device in order to accurately propagate the signal, and the problem with installing the resistor. This has the disadvantage of limiting the area of the board that can be freely used, and the disadvantage of requiring one end of the attached resistor to be connected to a power source or a ground ring.

[Means for solving problems]

The connector of the present invention is configured such that at least one signal line for transmitting a digital signal is selectively connected to one of two types of potential power sources via a resistor and a switch.

〔Example〕

The details of the present invention will be described above with reference to the drawings.

FIG. 1, FIG. 2(a), and FIG. 2(b) are a circuit diagram, a plan view, and a sectional view taken along line A-A', respectively, of an embodiment of the present invention. The connector main body 7 is attached in direction B to a header provided on a target board as a device for inputting and outputting digital signals. On the other hand, the connector body 7.6 is flat.
They are connected by a cable 14, which provides the same functionality as a conventional connector.

In this embodiment, a low potential supply terminal 9 and a high potential supply terminal 8 are provided on the main body 7, and respective voltages are supplied to these from an external power supply. By switching the slide switch 10, one of the voltages can be applied to one end 11 of the resistor mounting part.
given to. The voltage applied to the main body 7 is applied to the other end 13 of the resistor attachment part via the resistor 12. Furthermore, this voltage is applied to the signal line 5 and to the connector 15, and the target substrate is applied as before.

Even if the signal applied from the main body 6 to one line of the flat cable 14 is floating (at an intermediate potential), the correct voltage is supplied to the target substrate. A similar effect can be obtained by making the resistor 12 variable and changing the voltage value using the variable resistor.

〔Effect of the invention〕

As explained above, the present invention has the effect of increasing the freely usable board area of the connected device by installing a resistor in the connector, and the power supply device and the switching device are installed in the connector. By installing it, you can easily select pull-up or pull-down of the signal line.

[Brief explanation of the drawing]

1, 2(a), and 2(b) are a circuit diagram, a plan view, and a sectional view taken along the line AA' of an embodiment of the present invention, and FIG. 3 is a circuit diagram of a conventional example. 7... Connector body, 8... High potential supply terminal, 9...
・・Low potential supply terminal, 10 ・・Slide type switch, 1
1.13...Resistor mounting part, 12...Resistor, 14...
Flat cable, 15... Contact point with the header on the target board. Dragon 1 Figure ♀ 2 Figure

Claims (1)

[Claims] In a connector that connects multiple devices that input and output digital signals, at least one signal line is selectively connected to one of two potential power sources via a resistor and a switch. A connector characterized by: