JPH10172699A - Connection apparatus for transmitting cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and reliably confirm whether each terminal resistance is connected with the corresponding terminal end of a transmitting cable or not. SOLUTION: This connection apparatus carries out multipoint connection of transmission cable 10, which is constituted of two signal wires and one earth wire and comprises one connector 3 for connection, and a transmission cable 11, which is constituted of two transmission wires and one earth wire and comprises one connector 6 for branching, by connecting a counterpart connector 2 for connection and a counterpart connector 5 for branching, respectively, through an electric cable 14. In this case, a resistance circuit 7, the former connector 6 for branching, and a connector case 1 are installed: in the circuit 7, a terminal resistance 8 and a switching contact point 9 are connected in series between two signal wires 14a, 14b which connect the counterpart connector 2 for connection and the former connector 5 for branching: in the former connector 6, a circuit opening mechanism 12 to open the switching contact point 9 of the resistance circuit 7 when the circuit 7 is connected with the counterpart connector 5 for branching is installed: and the connector case 1 houses the counterpart connector 2 for connection, the counterpart connector 5 for branching, and the resistance circuit 7 and is made transparent in a part where these connectors 2, 5 and the circuit 7 exist as to make these members observable from the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission line connecting device for branch-connecting a transmission line.

[0002]

2. Description of the Related Art A conventional transmission line connection device is configured as shown in FIG. In the figure, a connector such as a storage device is provided with a connector connector 31, and the connector connector 31 is provided with a first connector 24 and a second connector 25. The connector 22 of the input / output bus 20 is connected to the first connector 24, and the connector 23 of the input / output bus 21 is connected to the second connector 25. The corresponding terminals of the first connector 24 and the second connector 25 are connected to each other and are connected to the internal circuit 32 by a signal line 31. 27 is a contact piece connected to the signal line 30;
Reference numeral 28 denotes a contact piece that contacts the contact piece 27. A series circuit composed of the resistors R1 and R2 constituting the terminating resistor is a power supply Vc.
c, and the connection point of the resistors R1 and R2 is a spring 2
9 is connected to the contact piece 28. A push button 26 is provided adjacent to the first connector 24. When the connector 22 is attached to the first connector 24, the push button 26 is pressed by the connector 22, and as a result, the push button 26 presses the contact piece 28 to release the contact of the contact pieces 27, 28. Thus, the terminating resistors R1 and R2 are disconnected from the signal line 30. on the other hand,
In the last storage device, the first connector 24 and the connector 2
2 is not connected, the contact of the contact pieces 27 and 28 is not released, and the terminating resistors R1 and R2 are connected to the signal line 30 (Japanese Patent Laid-Open No. 5-89656).

[0003]

However, the conventional transmission line connection device has a mechanism for disconnecting the terminating resistors R1 and R2 and the terminating resistor in the device, and the input and output are connected to the first connector 24 attached to the device. Connector 22 attached to bus 20
Is connected, the contact pieces 27 and 28 connected to the terminating resistors R1 and R2 are activated to cancel the contact of the contact pieces 27 and 28, thereby separating the terminating resistors R1 and R2 from the signal line 30. For this reason, whether or not the device has a built-in terminating resistor must be checked with the device manual or the like, and the handling is complicated. It is an object of the present invention to be able to easily confirm whether or not a terminating resistor is connected to the terminating end of a transmission line.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a transmission line comprising two signal lines having one connection connector and one ground line, and a transmission line comprising the other branch line. In a transmission line connection device, two transmission lines each having a connector and one transmission line composed of one ground line are connected to the other connection connector and one branch connector, respectively, whereby the connection is branched and connected via electric wires. A resistor circuit in which a terminating resistor and an open / close contact are connected in series between two signal lines connecting the other connection connector and one branch connector, and the resistance circuit when the one branch connector is connected. The other branching connector provided with an opening mechanism for opening the on-off contact, the other connecting connector, the one branching connector and the resistance circuit are housed so that the resistance circuit can be seen from the outside. It is provided and a connector case which was transparent parts.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. FIG. 1 is a circuit diagram of a transmission line connection device according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a connector case made of a transparent insulating material, in which a connector 2 for connection to one connector 3 connected to a transmission line 10 is provided. 4
Is a terminal attached to the connector case 1 and is configured to be connectable to another transmission line (not shown). 5 is one branching connector attached to the connector case 1;
The other connector 2 is connected to the other connector 2 by an electric wire 14 composed of signal lines 14a and 14b. Reference numeral 6 denotes the other branching connector, which includes an opening mechanism 12 for opening the switching contact of the resistance circuit when the other branching connector 6 is fitted to the one branching connector 5. A transmission line 11 is connected to the other branching connector 6, and the transmission line 11 is branched from the other connecting connector 2 via one branching connector 5. 7 is a terminating resistor 8
And a switching circuit 9 connected in series, and is connected between the lines of the connection circuit between the other connector 2 and one branching connector 5. Reference numeral 13 denotes a transparent window provided on the upper surface of the connector case. In the transmission line connection device configured as described above, when the other connection connector 2 is fitted to the one connection connector 3 attached to the transmission line 10, the other branch connector 6 is connected to the one branch connector 5. Since they are not fitted, the switching contact 9 is closed, and the terminating resistor 8 of the resistor circuit 7 is connected to the other connector 2.
Therefore, electricity flows from one terminal of the other connector 2 to the circuit flowing through the terminating resistor 8 of the resistor circuit 7 to the other terminal of the one branch connector 5 via the switching contact 9 and the transmission line. The resistor 8 is connected. Next, when the other branch connector 6 is connected to the one branch connector 5 of the same connector case 1 from this state, the opening mechanism 12 of the other branch connector 6 opens and closes the switching contact 9 of the resistance circuit 7. However, the terminating resistor 8 is not connected to the connection circuit between the other connection connector 2 and one branch connector 5. As described above, when the other branching connector 6 is inserted into one branching connector 5 of the connector case 1, the rod (not shown) provided on the other branching connector 6 is schematically illustrated in FIG. The operating piece (not shown) provided on the branching connector 5 is operated to open / close the switching contact 9 of the resistor circuit 7 to disconnect the terminating resistor 8 from the transmission line circuit.
The other connector 2, one branching connector 5, and the resistor circuit 7 are housed in the connector case 1, and a transparent window 13 provided in the connector case 1 allows the terminal resistor 8 to be housed in the connector case 1 or the open / close contact. 9 can easily confirm the open / closed state, and the handling becomes simple.

[0006]

As described above, according to the present invention, the other connecting connector, one branching connector, and the resistor circuit are housed in the connector case, and the presence or absence of the resistor is detected through the transparent window provided in the connector case. In addition, the open / close state of the open / close contact can be easily checked, and the handling is simplified.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a transmission line connection device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of a conventional transmission line connection device.

[Explanation of symbols]

1 connector case, 2 connector for one connection,
3 Connector for the other, 4 terminals, 5 Connector for one branch, 6 Connector for the other branch, 7 Resistor circuit, 8 Terminating resistor, 9 Opening / closing contact, 10, 11
Transmission line, 12 opening mechanism, 13 transparent window, 14
Electric wires, 14a, 14b signal wires

Claims (4)

[Claims] 1. A connector having one connecting connector (3).
Transmission line (10) consisting of one signal line and one ground line
And two transmission lines having the other branching connector (6) and a transmission line (11) composed of one grounding wire are connected to the other connector (2) and one branching connector (5), respectively. The connection device for a transmission line that branches and connects via an electric wire (14) by connecting to the other connector (2) and one branch connector (5). 14b) a resistor circuit (7) in which a terminating resistor (8) and an open / close contact (9) are connected in series, and opening and closing of the resistor circuit (7) when connected to the one branch connector (5) Opening mechanism (1) for opening the contact (9)
The other branching connector (6) provided with 2), the other connecting connector (2), one branching connector (5), and the resistance circuit (7) are housed therein and the resistance circuit (7) is housed therein. And a connector case (1) having a transparent portion so that the portion can be seen from the outside. 2. The transmission line connection device according to claim 1, wherein the portion visible from outside the resistance circuit is a terminating resistor. 3. The transmission line connection device according to claim 1, wherein the portion visible from outside the resistance circuit is a switching contact. 4. The transmission line connection device according to claim 1, wherein the portions visible from outside the resistance circuit are a terminating resistor and a switching contact.