JPH09130310A - Communication wiring inspection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily detect all abnormality such as disconnection, erroneous wiring and short-circuit, etc., of communication wiring in a short time. SOLUTION: For this communication wiring inspection device for inspecting the communication wiring of eight wires, a transmitter 100 is used on the transmission side of the wiring for confirmation, a receiver 200 is used on the reception side of the wiring for the confirmation and the transmitter 100 is provided with a constant current source G1. The wiring from the constant current source G1 is separated into two wires, the wiring for the confirmation is paired by two wires each and a constant current is made to flow from the constant current source G1 so as to generate a potential difference at the current merging point of the transmission side and reception side of the paired wiring for the confirmation. A resistance diode light emitting element is connected so as to make half each of the current flow to the paired two wires and the light emitting element is set only on the side of the receiver 200.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication wiring inspection device for detecting an abnormality in communication wiring.

[0002]

2. Description of the Related Art Conventionally, in this type of inspection device circuit, a power supply BAT1 and a protection resistor R1 shown in FIG. 5 and a folded piecing method using light emitting diodes LED1 to LED7 and a power supply BAT1 shown in FIG. A switching method using a resistor R1, a changeover switch SW1 and a light emitting diode has been proposed.

However, in the method of FIG. 5, the wiring confirmation light emitting diode emits light by the four-wire miswiring as shown in FIG. 6, and the miswiring cannot be found.

Further, when the distance between both ends of the line to be checked is usually long, it is necessary to check the light emission of the light emitting diodes of both the LEDs 1 to 3 of the transmitter and the LEDs 4 to 7 of the receiver. However, if the other light emitting diode is not emitting light due to a short circuit, it is not enough to check only one light emitting diode, and the quality cannot be confirmed without checking the light emitting diodes of both the transmitter and the receiver. is there.

Further, in this method, when any one of the confirmation wirings is broken, none of the light emitting diodes emit light, so that the measurement connectors A1 to A8 and B1 to B8 are used.
You have to check again if it is wrong.

In the system shown in FIG. 7, a switch or a semiconductor switch is used to switch from the contact P1 of the switch SW1 to the contact P.
2, P3, P4, P5, P6, P7 are sequentially switched, and light emitting diodes LED1, LED2, LED3, L
This is a method for confirming that ED4, LED5, LED6, and LED7 sequentially emit light.

In this system, if the change-over switch is an automatic system, the wiring is confirmed by disconnecting the confirmation wiring by confirming that the light emitting diodes sequentially emit light one by one.
Although miswiring and short circuits can be found, there is a drawback that the confirmation test takes time because the lights must be emitted in order.

The present invention has been made in order to solve the above-mentioned conventional drawbacks. An object of the present invention is to provide a communication wiring inspection device that can easily detect all abnormalities such as disconnection, erroneous wiring, and short circuit of communication wiring in a short time.

[0009]

The gist of the present invention will be described with reference to the accompanying drawings.

A communication wiring inspecting apparatus for inspecting communication wiring of eight wirings, wherein a transmitter 10 is provided on the transmitting side of the confirmation wiring.
0, the receiving device 200 is used on the receiving side of the confirmation wiring, the constant current source G1 is provided in the transmission device 100, the wiring from the constant current source G1 is separated into two wirings, and the first confirmation wiring W1 One of the separated wirings is directly connected to the transmission side, and at least one resistor R1 and at least one resistor R1 are connected to the other wiring of the separated wirings on the transmission side of the second confirmation wiring W2. The connected diode D1 is connected in series, and at least one resistor R21 and at least one diode D21 connected in the forward direction are connected in series on the receiving side of the first confirmation wiring W1. The LEDs 11 are connected in series, the light emitting element LED12 is connected to the reception side of the second confirmation wiring W2, and this is connected at the confluence point X2 on the reception side of the first confirmation wiring W1. Divide the merged wiring into two wirings And, one of the wirings of wirings said separated to the receiving side of the third check wiring W3, the light emitting element LE
The other wiring of the separated wirings is connected to the receiving side of the fourth confirmation wiring W4 by the light emitting element LE.
D14, at least one diode D23 connected in the forward direction, and at least one resistor R22 are connected in series, respectively, and at least one diode D3 connected in the forward direction is provided on the transmission side of the third confirmation wiring W3. , At least one resistor R2 is connected in series, and the fourth confirmation wiring W4 and the transmission side of the resistor R2 are joined together, and the joined wiring is separated into two wirings. One of the separated wirings is connected through at least one diode D5 connected in the forward direction, and the other wiring separated in the sixth confirmation wiring W6 is connected to at least one resistor R3 and at least one forward direction. The connected diode D7 is connected in series, and on the receiving side of the fifth confirmation wiring W5,
At least one resistor R23 and at least one diode D26 connected in the forward direction are connected in series, and further the light emitting element LED15 is connected in series, and a sixth confirmation wiring W is provided.
The light emitting element LED16 is connected to the receiving side of No. 6, and this is connected at the junction point X4 on the receiving side of the fifth confirmation wiring W5, and the merged wiring is separated into two wirings. On the receiving side of the confirmation wiring W7, one of the separated wirings is connected via the light emitting element LED17, and on the receiving side of the eighth confirmation wiring W8, the other separated wiring is connected to the light emitting element LED1.
8. At least one forward-connected diode D2
8. Connect at least one resistor R24 in series, and connect at least one diode D11 connected in the forward direction and at least one resistor R4 in series to the transmission side of the seventh confirmation wiring W7. , The eighth confirmation wiring W8 is connected to the transmission side, the two wirings are joined, the constant current source G1 is connected, and the third confirmation wiring W3 and the fourth confirmation wiring W4 are received. According to the communication wiring inspection device, the diode D25 is connected in the reverse direction from the junction point X2 on the side to the junction point X4 on the reception side of the fifth confirmation wiring W5 and the sixth confirmation wiring W6. It is a thing.

A communication wiring inspecting apparatus for inspecting communication wiring of four wirings, wherein the transmitting side of the confirming wiring uses the transmitting device 100 and the receiving side of the confirming wiring uses the receiving device 200. Is provided with a constant current source G1, and the wiring from the constant current source G1 is separated into two wirings.
1 is directly connected to the first wiring from the constant current source G1, and the second confirmation wiring W2 is connected to the second wiring from the constant current source G1 with at least one resistor R1 and at least one forward direction. The connected diode D1 is connected in series, and at least one resistor R2 is provided on the receiving side of the first confirmation wiring W1.
1 and at least one diode D2 connected in the forward direction
1 is connected in series, the light emitting element LED11 is connected in series, the light emitting element LED12 is connected to the receiving side of the second confirmation wiring W2, and the receiving side of the first confirmation wiring W1 is connected. At the junction point X2, the merged wiring is separated into two wirings, and one of the separated wirings is connected to the reception side of the third confirmation wiring W3 through the light emitting element LED13. Then, the other wiring of the separated wiring is connected in series with the light-emitting element LED 14, at least one diode D23 connected in the forward direction, and at least one resistor R22 to the receiving side of the fourth confirmation wiring W4. At the transmission side of the third confirmation wiring W3, at least one diode D3 connected in the forward direction and at least one resistor R2 are connected in series, and the transmission side of the fourth confirmation wiring W4 is connected to the transmission side of the third confirmation wiring W3. Connect and Those related to the communication line inspection system being characterized in that connected to the current sources G1.

A light emitting element L provided in the receiving device 200
Constant current diode CRD in parallel with ED11 to LED18
The communication wiring inspection apparatus according to any one of claims 1 and 2, wherein 1 to CRD8 are connected in a forward direction.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the present invention (how to implement the invention), which is considered to be the best, will be briefly described with reference to the drawings, showing its operational effects.

According to the present invention, the confirmation wirings W1 to W8 are paired every two wirings so that a potential difference is generated between the branching point X1 and the confluence point X2 of the paired confirmation wirings W1 and W2 on the transmitting side and the receiving side. A constant current is made to flow from the constant current source G1 to the resistors R1 and R2 so that half the current flows in the paired two wirings.
1, diode D1, D21, light emitting element LED11, L
Connect the ED12.

The confirmation wirings W3 and W4, W5 and W
6, W7 and W8 are also paired with two wirings, and half of the current flows through the paired wirings in the same manner as in the case of the confirmation wirings W1 and W2. By providing the light emitting elements LED11 to LED18, by confirming only the light emitting state of each light emitting element of the receiving device 200, it is possible to inspect for abnormality such as short circuit, erroneous wiring, disconnection of each confirmation wiring.

For example, the confirmation wiring W as shown in FIG.
When 1 and W2 are short-circuited, most of the current from the shunt point X1 flows to the light emitting element LED12 on the wiring side with a small load, almost no current flows to the light emitting element LED11, and the light emitting element LED11 does not emit light. An abnormality in the confirmation wirings W1 and W2 can be detected.

Next, the confirmation wiring W as shown in FIG.
When 1 and W2 are erroneously wired, most of the current from the shunt point X1 flows to the light emitting element LED12 on the wiring side with less load, and almost no current flows to the light emitting element LED11, and the light emitting element LED11 does not emit light. The abnormality in the confirmation wirings W1 and W2 can be detected.

Further, the confirmation wirings W1 to W1 as shown in FIG.
When W8 is erroneously wired, and when the diode D25 is not connected between the merging point X2 and the merging point X4, all the light emitting elements of the light emitting elements LED11 to LED18 emit light and the erroneous wiring is performed. Cannot be detected, but the confluence point X
By connecting the diode D25 in the opposite direction from 2 to the confluence point X4, the light emitting element LED1 on the wiring side having a large load
1, a current hardly flows through the LED 12, the LED 17, and the LED 18, and since no light is emitted, an erroneous wiring can be detected.

Further, in the third aspect of the invention, each of the light emitting elements LED11 to LED1 provided in the receiving device 200 is provided.
8 is connected in parallel to the constant current diodes CRD1 to CRD8 in the forward direction, so that, for example, when the confirmation wiring W1 and the confirmation wiring W2 as shown in FIG. A small amount of current may flow through the LED 11, and in this case the light emitting element LED11 may emit a dim light. However, by connecting the constant current diode CRD1 in parallel to the light emitting element LED11, a small amount of current can be maintained. All the current flows in the current diode CRD1, no current flows in the light emitting element LED11, and no light is emitted.

[0020]

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

First, in the communication wiring inspecting apparatus for inspecting the eight-wiring communication wirings as shown in FIGS. 1 to 4, the transmitter 100 and the confirmation wiring W1 to W8 are provided on the transmission side of the confirmation wirings W1 to W8. A receiving device 200 is used on the receiving side of W8, and a constant current source G1 that flows a constant current regardless of the load is provided in the transmitting device 100, and the wiring from the constant current source G1 is separated into two wirings at a diversion point X1. , One of the separated wirings is directly connected to the first confirmation wiring W1, and the second confirmation wiring W2
At least one resistor R1 and at least one diode D1 such as a silicon diode connected in the forward direction are connected in series to the other wiring of the separated wiring, and the receiving side of the first confirmation wiring W1 is connected to the other wiring. , At least one resistor R21 and at least one diode D21 such as a silicon diode connected in the forward direction are connected in series, and further a light emitting element LED11 such as a light emitting diode is connected in series, and a second confirmation wiring W2 The light-emitting element LED12 such as a light-emitting diode is connected to the receiving side of, and is connected at the confluence point X2 on the receiving side of the first confirmation wiring W1.

Next, the wiring is separated into two wirings from the confluence point X2, and one wiring of the separated wirings is connected to the receiving side of the third confirmation wiring W3, and a light emitting element LED1 such as a light emitting diode.
3, the other wiring of the separated wiring is connected to the receiving side of the fourth confirmation wiring W4 such as a light emitting element LED14 such as a light emitting diode, or at least one silicon diode connected in the forward direction. A diode D23 and at least one resistor R22 are connected in series,
On the transmission side of the third confirmation wiring W3, at least one diode D3 such as a silicon diode connected in the forward direction and at least one resistor R2 are connected in series,
This is connected to the transmission side of the fourth confirmation wiring W4 at a junction X3.

Further, the merged wiring is separated into two wirings, and at the transmission side of the fifth confirmation wiring W5, at least one separated wiring is connected through at least one diode D5 such as a silicon diode connected in the forward direction. On the transmission side of the sixth confirmation wiring W6, at least one resistor R3 and at least one diode D7 such as a silicon diode, which are connected in the forward direction, are connected in series to the other separated wiring. At the receiving side of the fifth confirmation wiring W5, at least one resistor R23 and at least one diode D such as a silicon diode connected in the forward direction are connected.
26 and the light emitting element LED15 such as a light emitting diode are connected in series, and the sixth confirmation wiring W6
On the receiving side of the light emitting element LED1 such as a light emitting diode
6 is connected, and this is connected at the junction point X4 on the receiving side of the fifth confirmation wiring W5.

Next, the wiring is separated into two wirings from the confluence point X4, and one of the separated wirings is connected to the receiving side of the seventh confirmation wiring W7, and a light emitting element LED1 such as a light emitting diode.
7, the other wiring of the separated wiring is connected to the receiving side of the eighth confirmation wiring W8, such as a light emitting element LED 18 such as a light emitting diode and at least one silicon diode connected in the forward direction. A diode D28 and at least one resistor R24 connected in series,
At least one diode D11 such as a silicon diode connected in the forward direction and at least one resistor R4 are connected in series to the transmission side of the seventh confirmation wiring W7, and the eighth confirmation wiring W8 is connected to this. Confluence point X with the sender
Connect at 5, and connect this to a constant current source.

From the confluence point X2 on the receiving side of the third confirmation wiring W3 and the fourth confirmation wiring W4, on the reception side of the fifth confirmation wiring W5 and the sixth confirmation wiring W6. To junction point X4 Diode D such as silicon diode
Connect 25 in the opposite direction.

The above is the overall configuration of the communication wiring inspection apparatus for inspecting the eight-wire communication wiring of the present invention.

Next, the operation of the communication wiring inspection device will be described.

A constant current source G1 provided in the transmitter 100 always causes a constant current to flow to the shunt point X1, and this current is shunted into two from the shunt point X1, one of which is directly connected to the transmission side of the confirmation wiring W1. Flow, resistance R2 on the receiving side of confirmation wiring W1
1, the diode D21, the light emitting element LED11 sequentially flow, the other is the resistance R to the transmitting side of the confirmation wiring W2.
1, the current flows through the diode D1, the light emitting element LED12 on the receiving side of the confirmation wiring W2, and the current split at the diversion point X1 flows through the confirmation wiring W1 and the confirmation wiring W2, respectively. After flowing through the light emitting element LED12, they merge at a merge point X2.

It can be seen that when a current flows through the light emitting element, the light emitting element emits light and there is no abnormality such as disconnection, short circuit, erroneous wiring, etc. in the confirmation wiring.

In addition, the current flows through the resistor to cause a voltage drop obtained by multiplying the current by the resistance value. When a silicon diode is used as the diode, a voltage drop of about 0.6 V occurs.

Therefore, if the resistors R1 and R21, the diode D1 and the diode D21, and the light emitting element LED11 and the light emitting element LED12 are of the same standard, the voltage drop on the transmitting side and the receiving side of the confirmation wiring W1 is confirmed. Since the voltage drop is the same as the voltage drop on the transmission side and the reception side of the wiring W2 for use, the current that is shunted at the shunting point X1 and flows through the confirmation wiring W1 and the confirmation wiring W2 is shunted equally. The light emitting element LED11 and the light emitting element LED12 emit light with the same light emission intensity.

Next, the currents merged at the merge point X2 are then split into two, one of which flows to the receiving side of the confirmation wiring W3 through the light emitting element LED13 and the confirmation wiring W3.
3 sequentially flows through the diode D3 and the resistor R2 on the transmission side, and the other side is the light emitting element LED for the reception side of the confirmation wiring W4.
The current flowing through the diode 14, the diode D23 and the resistor R22 and flowing out to the transmitting side of the confirmation wiring W4 is the confirmation wiring W4.
The current flowing out of the resistor R2 on the transmitting side of 3 merges at the junction point X3.

Therefore, if the resistors R2 and R22, the diode D3 and the diode D23, and the light emitting element LED13 and the light emitting element LED14 are the elements of the same standard, respectively,
Since the voltage drop on the reception side and the transmission side of the confirmation wiring W3 and the voltage drop on the reception side and the transmission side of the confirmation wiring W4 are equal, they are shunted at the junction point X2 and the confirmation wiring W3 and the confirmation wiring W3. The current flowing through the wiring W4 is divided equally, and the light emitting element LED13 and the light emitting element LED14 emit light with the same light emission intensity.

Further, the current that merges at the merge point X3 is
After that, the current is divided into two, one of which flows to the transmission side of the confirmation wiring W5 through the diode D5, and the resistor R23, the diode D26, and the light emitting element LE on the reception side of the confirmation wiring W5.
D15 sequentially, the other flows to the transmission side of the confirmation wiring W6 through the resistor R3, the diode D7, and the diode D9, and the light emitting element LED1 is received on the reception side of the confirmation wiring W6.
6 and the current split at the confluence X3 flows through the confirmation wiring W5 and the confirmation wiring W6, respectively, and the light emitting element LED1
5 and the light emitting element LED16, and then merge at the merge point X4.

Therefore, if the resistors R3 and R23, the diode D7 and the diode D26, the diode D9 and the diode D5, and the light emitting element LED16 and the light emitting element LED15 are the elements of the same standard, respectively, the transmitting side of the confirmation wiring W5 and Since the voltage drop on the receiving side is equal to the voltage drop on the transmitting side and the receiving side of the confirmation wiring W6, the currents shunting at the junction X3 and flowing through the confirmation wiring W5 and the confirmation wiring W6 are equal. Will be divided into two, and the light-emitting element LE
D15 and the light emitting element LED16 emit light with the same emission intensity.

Next, the currents merged at the merge point X4 are split into two thereafter, one of which flows to the receiving side of the confirmation wiring W7 through the light emitting element LED17 and the confirmation wiring W7.
Of the light emitting element LED to the receiving side of the confirmation wiring W8 on the transmitting side of the confirmation wiring W8.
The current flowing through the diode 18, the diode D28, and the resistor R24 and flowing out to the transmitting side of the confirmation wiring W8 is the confirmation wiring W.
The current flowing out of the resistor R4 on the transmission side of No. 7 merges at the junction point X5, and then flows to the constant current source.

Therefore, if the resistor R4 is the resistor R24, the diode D11 and the diode D28, and the light emitting element LED17 and the light emitting element LED18 are the elements of the same standard, the voltage drops on the receiving side and the transmitting side of the confirmation wiring W7. Since the voltage drop on the receiving side and the voltage drop on the transmitting side of the confirmation wiring W8 are equal, the voltage is divided at the confluence point X4 and the confirmation wiring W8 is obtained.
The current flowing through 7 and the confirmation wiring W8 is equally divided, and the light emitting element LED17 and the light emitting element LED18 emit light with the same light emission intensity.

As described above, in the communication wiring inspecting apparatus for inspecting eight wirings of the communication wiring, the current from the constant current source G1 is divided into two wirings, passed through the respective confirmation wirings, and then merged four times. LED composed of repeating circuit
It is possible to confirm that the wiring is normal by emitting light by passing through 11 to LED 18 and visually observing the light emission of each light emitting element LED 11 to LED 18.

The reason for connecting the diode D25 is that the confirmation wirings W1, W2, W3, W are as shown in FIG.
When W4, W5, W6, W7, and W8 are erroneously wired, all the light emitting elements LED11 to LED18 are turned on. Therefore, the diode D2 is moved from the confluence point X2 to the confluence point X4.
By connecting 5 in the opposite direction, the light emitting element LED1
This makes it possible to detect erroneous wiring as shown in FIG. 4 without causing the 1, LED 12, LED 17, and LED 18 to emit light.

Next, when the confirmation wiring W1 and the confirmation wiring W2 as shown in FIG. 2 are short-circuited, the confirmation wiring W1
And the wiring W2 for confirmation have the same potential, and the circuit of the resistor R21, the diode D21, the light emitting element LED11 and the light emitting element L.
The circuit of the ED12 is connected in parallel. In this case, most of the current flows to the light emitting element LED12 side with a small load, but the resistor R21, the diode D21, and the light emitting element L.
Depending on the characteristics of the ED 11, a small amount of current may flow through the light emitting element 11, which may cause the light emitting element LED 11 to emit a dimly bright light.

In this case, the confirmation tester may mistakenly recognize a short circuit abnormality of the confirmation wiring.

In order to eliminate the erroneous recognition of the short circuit abnormality as described above, the constant current diodes CRD1 to CRD8 are connected in parallel to the light emitting elements LED11 to LED18. Then, in the case of FIG. 2, by supplying all the current to the constant current diode CRD1, the light emitting element LED11 does not emit light at all, and the short circuit abnormality of the confirmation wiring is not erroneously recognized.

The constant current diodes CRD1 to CRD8
Has a function of always flowing only a constant current even when the voltage is changed when a voltage is applied to both ends, and it is set so that a small constant current flows through the constant current diodes CRD1 to CRD8, and most of the current is Is a light emitting element LED11 to LED
Set to flow to 18.

In the case of erroneous wiring as shown in FIG. 3, most of the current flows through the confirmation wiring W1 and the light emitting element LE.
D11 does not emit light, but the light emitting element LED12 emits light, and it can be confirmed that the wiring is incorrect.

Further, if the diodes D5 and D6 are not provided, the confirmation wiring W4 and the confirmation wiring W5 have the same potential even if the confirmation wiring W4 and the confirmation wiring W5 are short-circuited. Light emitting elements LED11 to LED
Since all 18 emit light, a short circuit abnormality cannot be detected.

By connecting a diode D5 in the forward direction to the transmitting side of the confirmation wiring W5 so that this short-circuit abnormality can be detected, when the confirmation wiring W4 and the confirmation wiring W5 are short-circuited, the confirmation wiring W6 Since almost no current flows through the device, the light emitting element LED16 does not emit light, and a short circuit abnormality can be detected.

In order to make the potential difference between the confirmation wiring W5 and the confirmation wiring W6 the same as the potential difference between the confirmation wiring W1 and the confirmation wiring W2, a diode D9 is forwarded on the transmission side of the confirmation wiring W6. In series.

As a result, the light emitting elements LED11 to LED
The emission intensity of 18 can be the same.

In the above description, the case of using one diode in each wiring has been described.
1 to 4, the diode is the diode D1.
D2, diodes D21 and D22, diodes D3 and D
4, diodes D23 and D24, diodes D5 and D
6, diodes D26 and D27, diodes D7 and D
8 and D9 / D10, diodes D11 / D12, and diodes D28 / D29 are used in pairs of two each.

The reason why two diodes are used in pairs is that, for example, when a silicon diode is used as the diode, the silicon diode can have a constant potential difference, but it is used in two pairs. As a result, a potential difference of two silicon diodes can be provided, so that the detection characteristics when the confirmation wiring is abnormal can be further stabilized.

A constant voltage diode may be used in place of the silicon diode, and a part or all of the silicon diode may be a constant voltage diode.

Further, as shown in FIG. 1, by connecting a light emitting element LED1 such as a light emitting diode in series between the constant current source G1 and the shunting point X1 of the transmitter 100, the data is transmitted to the confirmation wirings W1 to W8. Device 100 and receiving device 200
When the connection is made, the transmitting device 100 can confirm that a current flows from the constant current source G1 and the light emitting element LED1 emits light to inspect the receiving device 200.

As a result, when the transmitting side and the receiving side of the confirmation wirings W1 to W8 are on different floors such as a building, the wiring inspection of the confirmation wirings W1 to W8 is performed by the receiving device 20.
0 can be confirmed by the light emitting elements LED11 to LED18, and whether or not the receiving device 200 has been inspected is determined by the transmitting device 1
It can be confirmed by the light emitting element LED1 of 00.

Further, terminals are provided on the transmitting side and the receiving side of the confirmation wirings W1 to W8 so that connectors can be connected, and the confirmation wirings W1 to W of the transmitter 100 and the receiver 200 are provided.
Wiring for confirmation W if a connector is provided at the connection to 8
When inspecting 1 to W8, the transmitter 100 and the receiver 2
00 connector to the terminals provided on the transmitting side and the receiving side of the confirmation wirings W1 to W8, and at the same time, the receiving device 200
By confirming the light emitting states of the light emitting elements LED11 to LED18 provided in, it is possible to instantly inspect the confirmation wirings W1 to W8.

As described above, the short circuit of the eight wiring communication wires,
All abnormalities such as miswiring and disconnection can be inspected by checking the light emitting state of the light emitting element of the receiving device.

Further, the above-mentioned method of inspecting communication wiring of eight wirings can be applied to a wiring inspection apparatus which is n times as many as four wirings such as four wirings or twelve wirings.

Next, the four-wiring inspection device will be described. In the eight-wiring inspection device shown in FIG.
By using the circuits on the transmitting side and the receiving side for .about.W4 as they are, and connecting the junction point X3 shown in FIG. 1 to a constant current source, a four-wiring inspection device can be formed.

Further, the twelve-wire inspection apparatus uses the circuits on the transmission side and the reception side for the confirmation wirings W1 to W8 of the eight-wire inspection apparatus shown in FIG. 1 as they are, and the junction X5 is the constant current source G1. Connect the same circuit as the circuit on the transmission side and the receiving side from the confluence point X3 to the confluence point X5 shown in FIG. 1 to the confluence point X5, and connect the twelfth confirmation wiring and the tenth confirmation. The constant current source G
By connecting to 1, it is possible to make a twelve wiring inspection device.

An inspecting device having sixteen or more wires can be constructed by adding a circuit in the same manner as the above-mentioned inspecting device of twelve wires.

[0060]

Since the present invention is configured as described above, a potential difference is generated at the current confluence points of the transmitting side and the receiving side of the pair of confirmation wirings for every two confirmation wirings. By sending a constant current from a constant current source and connecting a resistor, a diode, and a light emitting element so that half the current flows through the two wirings in pairs, by checking only the light emitting state of the light emitting element provided in the receiving device. It is possible to detect all abnormalities such as short circuit of each confirmation wiring, erroneous wiring, disconnection and the like.

Further, since it is possible to detect an abnormality in the confirmation wiring by confirming only the light emitting element of the receiving device, the inspection becomes very easy, for example, in the wiring check extending over the different floors of the building.

Next, in the invention according to claim 3, a constant current diode is connected in parallel to each light emitting element provided in the receiving device in the forward direction, so that when a short circuit or an incorrect wiring occurs,
It is possible to prevent a small amount of current from flowing through the light emitting element, and eliminate the possibility that the light emitting element emits a dimly bright light and thus misidentifies a wiring abnormality.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a state in which a communication wiring inspection apparatus according to an embodiment of the present invention is connected to normal confirmation wiring.

FIG. 2 is a circuit diagram showing a state in which the communication wiring inspection apparatus according to the embodiment of the present invention is connected to the confirmation wiring for a short-circuited state.

FIG. 3 is a circuit diagram showing a state in which the communication wiring inspection apparatus according to the embodiment of the present invention is connected to a wiring for checking an erroneous wiring state.

FIG. 4 is a circuit diagram showing a state in which the communication wiring inspecting apparatus according to an embodiment of the present invention is connected to a wiring for confirming an incorrect wiring state.

FIG. 5 is a circuit diagram showing a state in which a conventional communication wiring inspection device is connected to a normal confirmation wiring.

FIG. 6 is a circuit diagram showing a state in which a conventional communication wiring inspection device is connected to a wiring for confirming an erroneous wiring state.

FIG. 7 is a circuit diagram showing a state in which a conventional communication wiring inspection device is connected to a normal confirmation wiring.

[Explanation of symbols]

100 transmitter 200 receiver G1 constant current source W1, W2, W3, W4, W5, W6, W7, W8 confirmation wiring R1, R2, R3, R4, R21, R22, R23, R
24 Resistances D1, D3, D5, D7, D11, D21, D23, D
25, D26, D28 diode LED11, LED12, LED13, LED14, L
ED15, LED16, LED17, LED18 Light emitting element X2, X4 Confluence point

Front page continuation (72) Koichi Matsumura Inventor Koichi Matsumura 4-15-2 Higashi-Nodacho, Miyakojima-ku, Osaka City, Osaka NTT Telecommunications Co., Ltd. Kansai area (72) Inventor Akira Kakimi, Miyakojima-ku, Osaka City, Osaka Prefecture 4-15-2 Higashi-Nodacho NTT Telecommunications Co., Ltd. Kansai (72) Inventor Kikuo Suda 2-5-23 Takadanobaba, Shinjuku-ku, Tokyo Sanyo Kogyo Co., Ltd. (72) Inventor Hideo Kuchibuchi 2-5-23 Takadanobaba, Shinjuku-ku, Tokyo Sanyo Kogyo Co., Ltd.

Claims (3)

[Claims] 1. A communication wiring inspecting device for inspecting communication wiring of eight wirings, wherein a transmitter is used for the transmitting side of the confirmation wiring, a receiving device is used for the receiving side of the confirmation wiring, and a fixed device is used for the transmitting device. Provide a current source, separate the wiring from the constant current source into two wiring,
The transmission side of the first confirmation wiring is directly connected to one of the separated wirings, and the transmission side of the second confirmation wiring is connected to the other wiring of the separated wirings with at least one resistor and at least one resistor. One diode connected in the forward direction is connected in series, and at least one resistor and at least one diode connected in the forward direction are connected in series on the receiving side of the first confirmation wiring, and further light is emitted. The elements are connected in series, the light receiving element is connected to the receiving side of the second confirmation wiring, and this is connected at the confluence point on the receiving side of the first confirmation wiring,
The merged wiring is separated into two wirings, one wiring of the separated wirings is connected to the receiving side of the third confirmation wiring through a light emitting element, and the other wiring of the separated wirings is connected. To the receiving side of the fourth confirmation wiring, a light emitting element, at least one diode connected in the forward direction, and at least one resistor are connected in series, respectively, and on the transmission side of the third confirmation wiring, , At least one diode connected in the forward direction, at least one resistor each connected in series, to join with the transmission side of the fourth confirmation wiring, separating the merged wiring into two wiring, The fifth confirmation wiring is connected to at least one separated wiring through at least one diode connected in the forward direction, and the sixth confirmation wiring is connected to at least one resistor and at least one other separated wiring. Connected in the forward direction It connects the diode through the series,
On the receiving side of the fifth confirmation wiring, at least one resistor and at least one diode connected in the forward direction are connected in series, and further a light emitting element is connected in series to receive the sixth confirmation wiring. Side, a light emitting element is connected, and this is connected at the junction of the receiving side of the fifth confirmation wiring, the merged wiring is separated into two wirings, and the seventh confirmation wiring is received. Connect one of the separated wires to the side through the light emitting element,
On the receiving side of the eighth wiring for confirmation, the other wiring separated is connected to the light emitting element, at least one diode connected in the forward direction, and at least one resistor connected in series, and the wiring for seventh confirmation On the transmission side, at least one diode connected in the forward direction and at least one resistance are connected in series, and the transmission side of the eighth confirmation wiring is connected to this to join the two wirings, and a constant current is applied. Connected to the source and connect a diode from the junction of the third confirmation wiring and the fourth confirmation wiring on the receiving side to the junction of the fifth confirmation wiring and the sixth confirmation wiring on the reception side. A communication wiring inspection device characterized by being connected in the reverse direction. 2. A communication wiring inspection device for inspecting communication wiring of four wirings, wherein a transmitter is used for the transmitting side of the confirmation wiring and a receiving device is used for the receiving side of the confirmation wiring, and a fixed device is used for the transmitting device. Provide a current source, separate the wiring from the constant current source into two wiring,
Connect the first wiring from the constant current source directly to the first confirmation wiring, and at least one resistor and at least one forward direction to the second wiring from the constant current source for the second confirmation wiring. Connected in series with the diode connected to, at the receiving side of the first confirmation wiring, at least one resistor and at least one diode connected in the forward direction are connected in series, and further the light emitting element is connected in series. Connect, connect the light emitting element to the receiving side of the second confirmation wiring, connect at the confluence point on the receiving side of the first confirmation wiring, and separate the merged wiring into two wirings. , The separated one wiring is connected to the receiving side of the third confirmation wiring through a light emitting element, and the other wiring of the separated wiring is connected to the reception side of the fourth confirmation wiring. , Light emitting device, at least one forward connected diode, at least one Each of the resistors is connected in series, and on the transmission side of the third confirmation wiring, at least one diode connected in the forward direction and at least one resistor are connected in series, and the fourth confirmation wiring of Connect to the sender,
A communication wiring inspection device characterized by being connected to a constant current source. 3. The communication wiring inspection device according to claim 1, wherein a constant current diode is connected in parallel in a forward direction to a light emitting element provided in the receiving device.