JPH09198267A - Cable erroneous connection detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To specify an erroneously connected cable and to prevent a special setting from being required by a simple constitution. SOLUTION: A unit circuit A is provided with a cable erroneous connection detection circuit P1. The cable erroneous connection detection circuit P1 is provided with pilot lamps H1 to H3 showing the connection abnormalities of cables to the outside by their lighting states. In each pilot lamp H1 to H 3, the lighting and turning off operations are controlled by a pilot lamp lighting circuit C1 receiving a detection signal. The pilot lamp lighting circuit C1 is connected with the signal lines for detection of connector parts A1 to A14 to be connected with the signal lines for detection of cables 11 to 14. Between the cables with each other on the way to the signal lines for detection of the connector parts A1 to A4, OR circuits C2 to C4 and pullup resistances R1 to R4 are connected. The OR circuits C2 to C4 transmit the detection signals in abnormal connection states to a signal path The pullup resistances R 1 to R 14 generate signals in noninput states into 'H'. In the connector parts B1 to B4 of a unit B, detection signals are folded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, for example, in a data transmission device, detects an erroneous connection of each cable when a unit circuit of a transfer source device and a unit circuit of a transfer destination device are connected by a plurality of cables. For equipment.

[0002]

2. Description of the Related Art As a technique for detecting an erroneous connection of a plurality of cables connected between unit circuits, there is, for example, one shown in FIG. In this prior art example, when connecting the two units C and D with a plurality of cables 51 to 54, an indicator lamp H4 for indicating whether or not the cables 51 to 54 are normally connected is provided and erroneously provided. Detecting connection. The detection of erroneous connection in this case is determined by returning a signal between the units C and D via the cables 51 to 54.

That is, the detection signal L5 ("L") is transferred from the unit C to the unit D through the cable 51.
In the unit D, the detection signal L5 is returned from the cable 52 to the unit C. Then, this detection signal L5 is similarly folded back to the unit C by the cable 53 and the cable 54, and the package P provided in the unit C is returned.
2 is input. Detection signal L5 in package P2
Is processed by the lighting circuit section C5 of the indicator lamp H4.

When the cables 51 to 54 are normally connected, the detection signal L5 is input to the lighting circuit section C5 through the above path and the indicator lamp H4 is turned off, whereby the normal connection state is established. It is shown that there is. On the other hand, for example, when the cable 54 is not connected, even if the detection signal L5 from the cable 53 is folded back by the unit D, it is not transmitted to the unit C. Then, since "H" is input to the lighting circuit section C5 by the pull-up resistor R5, H4 of the indicator lamp lights up, indicating that the connection state is abnormal.

As another example, for example, Japanese Patent Laid-Open No. 5-13
There is a technique disclosed in Japanese Patent No. 4790. In this conventional example, in the sending and receiving cards that are cable-connected,
A configuration for preventing an erroneous cable connection by displaying the connection state using ID information is described. As shown in FIG. 6, the transmission card 61 includes a transmission ID setting unit 611, and the reception card 62 includes a reception ID setting unit 21a, an ID comparison unit 21b, and a connection status display unit 21c.

In this conventional example, the transmission ID setting unit 611 sets the mounting position number of the connector, the receiving card number, and the connector number, and sends them to the receiving card 62. In the reception card 62, the same connection information set in the transmission ID setting unit 611 is set in the reception ID setting 21a. Then, the ID from the transmission ID setting unit 611 and the reception I
The ID from the D setting 21a is compared with the ID comparison unit 21b, and the result is displayed on the connection state display unit 21c. In this way, if the IDs match, the connection is normal, and if they do not match, the connection is abnormal. The setting of this ID in this case is performed manually in the transmission card 61 and the reception card 62.

[0007]

By the way, in the conventional example of FIG. 5, it is not possible to identify the cable that is erroneously connected. Further, even if there is a connection difference in the cables 51 to 54, since the indicator light is turned off to indicate a normal state, such a connection abnormality cannot be displayed.

Further, in the conventional example of FIG. 6, the structure becomes complicated because it is necessary to provide detection circuits on the transmission side and the reception side respectively. In addition, since the ID setting is performed manually, it cannot operate normally in case of incorrect setting.

An object of the present invention is to identify a cable that is erroneously connected, and to confirm it by an error display even if the connection is wrong, and which has a simple structure and which does not require any special manual setting. To provide.

[0010]

An erroneous connection detection device for a cable provided by the present invention is an erroneous connection detection device for detecting an erroneous connection in a plurality of cables connected between a first unit circuit and a second unit circuit. In, the plurality of cables have a pair of signal lines between the first and second unit circuits, and the first unit circuit has a pair of signal lines of each cable connected in series and folded back. The second unit circuit, wherein the second unit circuit has a first connector portion that forms a line, and the second unit circuit has a second connector portion to which the beginning and end of the folded signal line are connected, and the folded portion in the second connector portion. An erroneous connection detection means that outputs an erroneous connection detection signal to the beginning of the folded signal line in the next-stage cable when there is no continuity between the beginning and the end of the signal line, and the erroneous connection detection signal is input. And having a display means for displaying the mis-connected state.

In a preferred embodiment, the erroneous connection detection means reciprocates for each cable between the unit circuits through each cable connected between the first and second unit circuits, and passes through all the connected cables in series. An OR circuit that is provided between the cables on the way of the signal line and connects the end of the return signal line in the previous stage and the same signal as the detection signal in the normal connection state, and the end of the return signal line And a pull-up resistor for forming an erroneous connection detection signal.

Further, the cable misconnection detecting device of the present invention is characterized in that the connection terminals of each cable in the first connector section or the second connector section are formed at different positions for each cable. And

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A cable misconnection detecting device according to an embodiment of the present invention will be described below with reference to FIGS. In this embodiment, an example in which the units A and B are connected by four cables will be described. As shown in FIG. 1, the unit A includes connector parts A1, A2, A3 of the unit A,
Cable erroneous connection detection circuit P1 electrically connected to A4
Is provided. The cable erroneous connection detection circuit P1 includes indicator lights H1, H2, and H3 which are display means for externally indicating a cable connection abnormality in a lighting state.

The indicator lights H1, H2, H3 are connected to an indicator light lighting circuit C1 which is a display control circuit thereof. Here, the indicator lamp lighting circuit C1 is an encoder circuit that outputs A0, A1, and A2 corresponding to the states of the inputs Y0, Y1, Y2, and Y3 according to the table of FIG. 3, as described later. Then, the indicator lamp lighting circuit C1 causes the indicator lamp H1,
Lighting and extinguishing operations of H2 and H3 are controlled. The indicator lamp lighting circuit C1 includes connector parts A1, A2, A3, A which are connected to the detection signal lines of the cables 11, 12, 13, 14.
4 signal lines for detection are connected. Connector parts A1 and A
2, A3, and A4 detection signal lines, the pull-up resistors R1, R2, R3, and R4 and OR circuits C2 and C3,
C4 is connected.

The OR circuits C2, C3 and C4 are connected to the cable 1
It is interposed between the cables 1 and 12, the cables 12 and 13, and the cables 13 and 14, respectively. The pull-up resistors R1, R2, R3, and R4 set the signal in the non-input state to "H". In the unit B, the signal line reciprocates in the cable through the wiring on the BWB (back wiring board) and the wiring between the pins of the connector.
For convenience of explanation, the turning point of this signal is referred to as the connector portion B1,
Let B2, B3, and B4.

The operation of the embodiment having the above configuration will be described. First, the cables 11, 12 between the units A and B,
If 13 and 14 are properly connected, the cable 11
Detection signal L1 (“L”) sent to unit B through
Is folded back at the connector portion B1 on the unit B side as it is, and is input to the OR circuit C2 and the indicator lamp lighting circuit C1 as an erroneous connection detection signal S0. The unit B folds back the detection signal L1 by wiring on the BWB (back wiring board) or wiring between the pins of the connector portion of the unit B.
At this time, since the misconnection detection signal S0 is "L", O
The R circuit C2 outputs "L" in the input state of L2 ("L"). In the incorrect connection detection signal S0, "L"
Indicates that the connection is normal, and "H" indicates that the connection is incorrect.

The "L" output from the OR circuit C2 is sent to the unit B through the cable 12. The signal returned by the connector B2 of the unit B is input to the OR circuit C3 and the indicator lamp lighting circuit C1 as S1. At this time, since S1 is "L", the OR circuit C3
Is input to S1 (“L”) and L3 (“L”). Therefore, "L" is output from the OR circuit C3. After that, the OR circuit C4 also operates in the same manner. Therefore, the misconnection detection signals S0, S1, S2, and S3 all become "L" and are input to the indicator lamp lighting circuit C1.

In the indicator lamp lighting circuit C1, as shown in FIG. 2, outputs A0 and A are provided for inputs Y0, Y1, Y2 and Y3.
1 and A2 are obtained. Here, the output state with respect to the input / output state of the indicator lighting circuit C1, the indicator lighting state, and the specification of the abnormal cable are as shown in FIG. In the figure,
A circle indicates a lit state, and a cross indicates a non-lit state. Then, the outputs A0, A1, A2 of the indicator light lighting circuit C1 all become "H" when the cables 11, 12, 13, 14 are normally connected, and therefore all the indicator lights are turned off. Become. Therefore, it is possible to confirm the normal connection state of the cable from this off state.

On the other hand, for example, when the cable 12 is not connected, the detection signal L1 is transmitted through the cable 11.
(“L”) is folded back in the unit B, and the erroneous connection detection signal S0 becomes “L”. Therefore, the output of the OR circuit C2 is [L].
However, the erroneous connection detection signal S1 is not folded back through the cable 12 as in the previous case. Therefore, the false connection detection signal S1 is in the state of no input, but the false connection detection signal S1 becomes "H" due to the pull-up resistor R2. Therefore, the OR circuit C3 outputs "H", which is the cable 1
After being returned through 3, the erroneous connection detection signal S2 becomes "H". Therefore, the output of the OR circuit C4 becomes "H", and the incorrect connection detection signal S3 becomes "H".

Thus, when the misconnection detection signal S0 is "L", the misconnection detection signal S1 is "H", the misconnection detection signal S2 is "H", and the misconnection detection signal S3 is "H", the display is made. When the indicator lamp H2 is lit by the lighting circuit C1,
H1 and H3 are turned off, and connection abnormality of the cable 12 can be confirmed. If the cable 12 is connected in this state, the state in the previous operation is restored and the normal connection state is restored.

When the cables 12 and 14 are not connected, the erroneous connection detection signal S0 returns the detection signal L1 ("L") through the cable 11, but since the cable 12 is not connected, OR The output "L" of the circuit C2 is not folded back. Therefore, pull-up resistor R2
As a result, the incorrect connection detection signal S1 becomes "H". For this reason,
Since "H" is output from the OR circuit C3 and is returned, the misconnection detection signal S2 becomes "H".

Therefore, in this case, "H" is output from the OR circuit C4, but it is not folded back through the cable 14 and the erroneous connection detection signal S3 is generated by the pull-up resistor R4.
Becomes "H". The lighting state of the indicator lamp at this time indicates that the indicator lamps H1 and H3 are off and the indicator lamp H2 is in a lighting state, indicating that the cable 12 is abnormal. After that, when the cable 12 is connected, "L" is output from the OR circuit C2 and is returned through the cable 12 and the erroneous connection detection signal S1 becomes "L". Then, this incorrect connection detection signal S1
Is folded back through the cable 13 through the OR circuit C3, and the false connection detection signal S2 becomes "L".

On the other hand, since the "L" output from the OR circuit C4 is not folded back through the cable 14, the erroneous connection detection signal S3 becomes "H" due to the pull-up resistor R4. Therefore, the lighting state of the indicator light indicates that the incorrect connection detection signal S0
Is "L", the incorrect connection detection signal S1 is "L", the incorrect connection detection signal S2 is "L", and the incorrect connection detection signal S3 is "H". Therefore, the indicator lamp H3 is lit and the indicator lamp H1 And H2 are turned off, so that it can be confirmed that the cable 14 has a connection abnormality. In this way, even when a plurality of cables are not connected, the first cable that interrupts the transmission path of the detection signal is displayed. Then, by sequentially connecting the displayed cables, it is possible to secure a normal connection state.

Next, in the unit B, when the cables 12 and 13 are reversely erroneously connected, that is, the cables 12 and 13 are
A case will be described in which the points are crossed and connected. Here, as shown in FIG. 4, the pin numbers (positions of connection terminals) of the detection signal line and the connector pin in each cable are assigned as follows. That is, the unit 11 is connected to the cable 11.
1 to pin on signal line from B to B, unit B to A
Add 2 to the pin on the signal line that goes to. Also, cable 1
2 is a pin on the signal line from unit A to B
Is attached to the pin on the signal line from the unit B to the unit A. Further, in the cable 13, 3 is attached to the pin on the signal line from the unit A to B, and 4 is attached to the pin on the signal line from the unit B to A. In addition, the cable 14 has 4 for the pin of the signal line from the unit A to the unit B.
Add 1 to the pin of the signal line that goes from A to A.

In this configuration, the detection signal L1
When (L) is sent, the detection signal L1 is folded back between the pins 1 and 2 at the connector portion B1 of the unit B through the cable 11, and the incorrect connection detection signal S0 becomes "L". Then, "L" is output from the OR circuit C2, and the cable 12
Although it is sent to the unit B through the unit B, the connector which is originally folded back between the pins 2 and 3 at B3 becomes the pins 3 and 4 on the connector side and is different from the signal line side, so that it is not folded back. Therefore, the incorrect connection detection signal S1 becomes "H" due to the pull-up resistor R2.

Further, the OR circuit C3 outputs "H", but the cable 13 cannot be folded back because the pin numbers on the connector side and the signal line side of the connector B2 of the unit B are different. However, the incorrect connection detection signal S2 becomes "H" due to the pull-up resistor R3. In the incorrect connection detection signal S3, the output “H” of the OR circuit C4 is folded back at the cable 14,
It becomes "H". At this time, the incorrect connection detection signal S0 is “L”, the incorrect connection detection signal S1 is “H”, the incorrect connection detection signal S2 is “H”, and the incorrect connection detection signal S3 is “H”. It can be confirmed that 12 is abnormal.

In this case, since the abnormality is shown in the state where the cable is connected to the connector, the connection difference can be judged.
Then, the unit B side of the cable 13 is removed. It is considered that either the cable 12 or the cable 14 is normally connected to the connector B2. Therefore, if the cable 12 is folded back and connected from B3 to B2, and the cable 13 is connected to the connector portion B3, all the indicator lights are turned off, indicating a normal state.

Here, when the cable 14 is connected from the connector portions B4 to B2 and the cable 12 is connected to the connector portion B4, the state of the cable 12 does not change, but the connection difference occurs. Therefore, next, the cable 12
Is connected to the connector portion B2, the cable 12 becomes a normal connection. In this way, by setting the pin number by the cable, it is possible to detect the connection difference.

[0029]

As is apparent from the above description, according to the present invention, it is possible to identify a cable that is erroneously connected, and the pin number of the connector of the detection signal differs depending on the cable. Anomaly display is possible. Further, since the detection circuit may be attached only to the transmission side (second unit circuit), the configuration is simple, and it is not necessary to manually perform special setting.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a cable misconnection detecting device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an input / output state of the indicator lamp lighting circuit of FIG.

FIG. 3 is an explanatory diagram showing a lighting state of an indicator lamp with respect to a connection state of a cable.

FIG. 4 is a configuration diagram of a cable erroneous connection detection device in a state of erroneous cable connection.

FIG. 5 is a configuration diagram of a conventional example.

FIG. 6 is a configuration diagram of another conventional example.

[Explanation of symbols]

 A, B unit A1 to A4, B1 to B4 connector section 11 to 14 cable P1 cable erroneous connection detection circuit H1 to H3 indicator lamp C1 indicator lamp lighting circuit C2 to C4 OR circuit R1 to R4 pull-up resistor

Claims (2)

[Claims] 1. An erroneous connection detection device for detecting an erroneous connection in a plurality of cables connected between first and second unit circuits, wherein the plurality of cables are the first and second unit circuits. A pair of signal lines in between, the first unit circuit has a first connector portion that connects a pair of signal lines of each cable in series to form a folded signal line, the second unit circuit The unit circuit detects an erroneous connection when there is no continuity between the second connector portion to which the beginning and the end of the folded signal line are connected and the beginning and the end of the folded signal line in the second connector portion. It is characterized in that it has an erroneous connection detection means for outputting a signal to the beginning of the folded signal line in the cable of the next stage, and a display means for inputting the erroneous connection detection signal and displaying an erroneous connection state. Cable misconnection detection device. 2. The first connector portion or the second connector portion
2. The cable misconnection detecting device according to claim 1, wherein the connection terminals of each cable in the connector section are formed at different positions for each cable.