JPH0696812A - Erroneous connection detector - Google Patents

Abstract

PURPOSE:To prevent erroneous connection between devices without turning a power source ON by detecting whether there is a power source, to switch a signal from a connector, by comparing the signal from the connector with a switch reference signal, and whereby detecting if connection is carried out in a right way. CONSTITUTION:When a power source VCC is not included in a system, it is detected by a first power source detection means 404 in a receiving part 400, and a signal pattern from a connector is switched to an erroneous connection detector means 403 by a signal wire switching means 405. When a no-voltage condition is detected by a second power source detection means 407 in a transmission part 401, a signal wire switching means 409 is switched, and a signal pattern of a reference signal generation circuit 408 is transmitted to the means 403 through the connector and the means 405. The means 403 is formed of a comparison circuit and a dip switch, and a signal from a switch is compared with the signal pattern from the connector. When they are not identical, a signal is transmitted to an alarm generation circuit 402. Whether connection is in a normal condition, is confirmed without turning a power source ON.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an incorrect connection detecting device,
In particular, the present invention relates to a system for checking erroneous connection in a signal line cable between devices.

[0002]

2. Description of the Related Art Conventionally, in this kind of erroneous connection check between circuit boards, there is a deformation of the shape for distinguishing the connection direction of the connector in the cable connection, so that it is possible to confirm the connection error due to the connection direction. Is. When mounting a circuit board on a backboard, several signal lines on each circuit board are used and connected to a clamp or a ground to be used as a recognition signal for the circuit board.

[0003]

In the conventional erroneous connection check described above, the method of changing the shape of the connector is
A great deal of cost is required because all connectors must be unique in shape. Further, once the shape of the connector is determined, it is impossible to change the connection of the circuit board unless the design of the connector is changed. Even when the circuit board is mounted on the backboard, there is a method of individually changing the shape of the connector so that the circuit board can be mounted only on a specific location, but it costs a lot as described above.

Further, in the method of confirming whether the mounting is correct by detecting the value of the signal line, it is necessary to pass a check signal on the signal line. Therefore, a current must be passed from the backboard to the circuit board. If the peen arrangement of the power supply and the ground of the connector is different, the circuit board may be destroyed. The present invention provides an erroneous connection detection device capable of detecting an erroneous connection from a value on a signal line and driving each device of the present invention without turning on a power source to detect the erroneous connection.

[0005]

The erroneous connection detection device of the present invention uses one or more pairs of connectors,
Having a circuit board that can be connected to one or more other circuit boards,
In an information processing system for transmitting information between the circuit boards, a system is provided on the first circuit board including a pair of first and second connectors and a first connector. To detect whether or not the power of the
Of the power supply detecting means and the first connector, select some of the signal lines that communicate with the logic circuit in the first circuit board, and detect the first power supply when the system power is supplied. Means for supplying the selected signal line to the logic circuit in the first circuit board as it is, and for switching to wrong connection detection means when the system is not supplied with power, first signal line switching means, The signal pattern of the selected signal line switched by the first signal line switching means is compared with the signal pattern set and held in the first circuit board in advance, and if they do not match, it is regarded as an erroneous connection. An erroneous connection detecting means for transmitting a mismatch signal, an alarm generating means for fetching the mismatch signal from the mismatch signal sending means, and generating an alarm when the mismatch signal becomes valid, On a second circuit board including a receiving portion of a misconnection detecting device having a first power supply holding means for holding electric power for driving the above-mentioned means in one circuit board, and a second connector. , A second power supply detecting means for detecting whether or not system power is being supplied to the second circuit board, and a signal line connected to the first circuit board, the wrong connection detecting device receiving section When the power of the system is supplied to the several signal lines selected by, the second power source detecting means switches the signal lines from the logic circuit in the second circuit board to the connector side, When the power is not supplied, the second signal line switching means for switching to the reference signal generating means, and the signal pattern to be set and held in the first circuit board to be connected are set in advance in the second circuit board. Every second The reference signal generating means for sending the value set in the circuit board as a signal pattern to the signal line selected in the receiving section of the misconnection detecting device, and the above-mentioned means in the second circuit board are driven. And a sending section of the misconnection detecting device having a second power source holding means for holding electric power.

[0006]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 3 shows a first embodiment of the present invention, and FIG. 4 shows a second embodiment. FIG. 5 shows a fourth embodiment of the present invention. In the third embodiment of the present invention, a mounting tool for mounting a circuit board is added in the configuration of FIG.

A first embodiment of the present invention will be described.

In FIG. 3, circuit boards 100, 101,
102 is connected by connectors 201-204. It is normal that the circuit boards are connected in the order shown in FIG. There is a sending unit and a receiving unit according to the present invention corresponding to each connector. The connector corresponding to the sending unit can be structurally connectable to the connector corresponding to the receiving unit. Here, when the connector 202 corresponding to the sending unit 302 is connected to the connector 201 corresponding to the receiving unit 301, it is recognized that the connector 202 is normally connected by the function of the present invention, and an alarm does not occur, but the receiving unit 301 When the connector 304 corresponding to the sending unit 304 is connected to the connector 201 corresponding to, the connection is structurally possible, but the function of the present invention recognizes that the connection is erroneous and generates an alarm. Therefore, the circuit board 101
Can be connected, but the circuit board 102 cannot be connected.

A second embodiment of the present invention will be described.

In FIG. 4, the circuit boards 120 to 122 incorporate the receiving section of the misconnection detecting device of the present invention, and the backboard 123 incorporates the sending section of the misconnection detecting device of the present invention. . In particular, there is a sending unit corresponding to each connector of the backboard (see FIG. 4A). In the diagram B of FIG. 4, only 120 circuit boards can be connected to the connector 221 on the backboard.

A fourth embodiment of the present invention will be described.

In FIG. 5, circuit boards 130 and 131 are connected to a plurality of connectors via cables, and there is a receiving section of a misconnection detecting device corresponding to each connector on the circuit board, and a connector of each table. Corresponding to, there is a sending unit of the misconnection detecting device. In the present invention, since the receiving unit must correspond to the sending unit, the connector on the cable and the circuit board corresponds to the sending unit to the connector on the cable side and the receiving unit to the connector on the circuit board side. is doing.

Although the configuration is different from that of FIGS. 3 and 4 and 5, the sending unit and the receiving unit are in one-to-one correspondence.
Therefore, the operation between the sending unit and the receiving unit is exactly the same, and the description of the operation between the sending unit and the receiving unit is common. The following outline of the operation will be described focusing on a pair of the sending unit and the receiving unit.

FIG. 1 shows the internal structure of the sending unit and the receiving unit.

By connecting the sending unit 401 and the receiving unit 400, discrimination of erroneous connection is started. First, if the power supply VCC of the system is not turned on, the first power supply detection means 404 and the second power supply detection means 407 respectively present in the transmission unit and the reception unit detect that the power supply of the system is not turned on. The signal pattern from the connector is switched by the first signal line switching unit 405 and the second signal line switching unit 409 so that the signal pattern from the connector enters the erroneous connection detection circuit 403, and from the reference signal generation circuit 408 in the transmission unit. The signal line is switched so that the signal pattern of (1) goes to the connector section. Then, the circuit other than the present invention, that is, a normal circuit is separated.

The reference signal generating circuit 408 is present in the transmitting section 401 and is composed of an EEPROM (voltage erasing type nonvolatile memory element) and a signal voltage generating circuit (EE).
The PROM portion may be other holding means such as DIPSW (disp switch). The EEPROM holds the pattern of the generated signal, and the pattern can be changed by writing from the CPU. Also, once written, the pattern is retained even if the power is turned off. Since three signal lines are used in this embodiment, eight types of patterns are generated. The signal pattern created by the EEPROM is sent from the signal voltage generation circuit as a signal voltage (signal pattern) to the receiving unit side through the signal line switching means 409 and the connector.

In the receiving section, the power supply detecting means 404 detects that the system power supply VCC is not turned on, so that the signal pattern from the backboard side is sent to the erroneous connection detecting means 403 by the signal line switching means 405. It is in a state. The incorrect connection detecting means 403 is composed of a comparison circuit and a DIP switch (DIPSW). DIPSW preset in the comparison circuit
And the signal pattern input from the connector are compared, and if they do not match, that is, if the connection is incorrect, a mismatch signal is transmitted.

When the power of the system is turned on, the first and second power input detecting means 405 and 409 detect the first and second power inputs.
The connection of the signal line switching means 405 and 408 is changed, the respective means of the present invention are disconnected, the signal lines 1, 2 and 3 become normal signal lines, and the system can perform normal operation.

FIG. 2 shows a construction using a mounting tool 510 for preventing incorrect connection according to claim 3 of the present invention.

When the circuit board 500 is mounted on the backboard 501 and a mismatch signal is input to the mounting tool 510 from the circuit board 500, the alarm generation circuit 502 in the mounting tool generates an alarm. If no alarm occurs, it means that the implementation was successful. Further, the power supply holding means 506 supplies electric power through the power supply line VBB for driving each means of the present invention on the circuit board 500 and each means of the present invention in the backboard 501. By mounting the circuit board 500 on the backboard 501, the electric power is passed through the mounting tool 510, the circuit board 500,
It is supplied to the backboard 501.

Now, a third embodiment of the present invention will be described. The third embodiment uses the receiver 500 with the mounting tool 510 as the receiver shown in FIG.

[0022]

By using the device of the present invention, it is possible to confirm the normality of the connection without turning on the power, so that there is no fear of breaking the circuit board and the connector is physically unique. It is possible to check the normality of the connection without having to In addition, since the connection can be easily changed, the system configuration can be changed and flexibility can be provided. The signal line to which the signal pattern is sent is usually used as a general signal line, and it is not necessary to add a new signal line and to change it to a connector.

[Brief description of drawings]

FIG. 1 is a block diagram showing an internal configuration of a sending unit and a receiving unit of an erroneous connection device according to the present invention.

FIG. 2 is a block diagram showing a configuration in which a mounting tool according to claim 3 of the present invention is added to the configuration of FIG.

FIG. 3 is a block diagram showing a configuration of an embodiment corresponding to claim 1 of the present invention.

FIG. 4 is an explanatory diagram showing a configuration of an embodiment in claim 2 of the present invention.

FIG. 5 is an explanatory diagram showing a configuration of an embodiment in claim 4 of the present invention.

[Explanation of symbols]

 300, 302, 304, 400, 500 Receiver 301, 303, 305, 401, 501 Transmitter

Claims (4)

[Claims] 1. An information processing system having a circuit board connectable to one or more other circuit boards by using one or more pairs of connectors and transmitting information between the circuit boards. A pair of first and second connectors, and a first circuit board including the first connector, and a first circuit board for detecting whether or not the system is powered on the first circuit board. Of the power supply detecting means and the first connector to select some of the signal lines that communicate with the logic circuit in the first circuit board, and when the system power is supplied, the first power supply detection is performed. Means for supplying the signal of the selected signal line to the logic circuit in the first circuit board as it is, and for switching to the incorrect connection detection means when the system power is not supplied, , The first
Comparing the signal pattern of the selected signal line switched by the signal line switching means of 1 with a signal pattern set and held in the first circuit board in advance,
If they do not match, it is regarded as an erroneous connection, and an erroneous connection detection means is transmitted, and an inequality signal is transmitted from the inequality signal transmission means. On a second circuit board including a receiving portion of a misconnection detecting device having a first power supply holding means for holding electric power for driving the above-mentioned means in the circuit board, and a second circuit board including a second connector, Second power supply detection means for detecting whether or not the system power is supplied to the second circuit board, and the erroneous connection detection device receiving section in the signal line connected to the first circuit board. When the power of the system is supplied to the selected several signal lines, the second power supply detecting means switches the signal lines from the logic circuit in the second circuit board to the connector side to supply power to the system. Is accompanying If not supplied, the second signal line switching means for switching to the reference signal generating means and the signal pattern to be set and held in the first circuit board to be connected are set in advance in the second circuit board, The reference signal generating means for sending the value set in the second circuit board as a signal pattern to the signal line selected in the erroneous connection detection device receiving section, and each of the above-mentioned each in the second circuit board. An erroneous connection detecting device, comprising: a sending part of the erroneous connection detecting device having a second power source holding means for holding electric power for driving the means. 2. The misconnection detecting device has a sending part for each connector existing on the bus of the backboard, and a receiving part of the misconnection device is provided on each circuit board mounted on the connector on the backboard. The erroneous connection detection device according to claim 1, wherein 3. The second power source holding means is removed from the sending section of the wrong connection detecting device on the backboard, and the first power source holding means and the alarm generating means are received from the receiving section of the wrong connection detecting device on each circuit board. And a mounting tool for mounting each of the circuit boards on the backboard, which is present in the sending section of the misconnection detecting device on the backboard and the receiving section of the misconnection detecting device on each of the circuit boards. When the circuit board is mounted on the backboard using the mounting tool while holding electric power for driving each means, the sending unit of the misconnection detecting device on the backboard and the mounted circuit board Power supply holding means for supplying electric power to each means existing in the receiving part of the wrong connection detecting device and the receiving part of the wrong connection detecting device on the mounted circuit board when the circuit board is mounted on the backboard. 3. The misconnection detecting device according to claim 2, further comprising a mounting tool having an alarm generating means for taking in the non-matching signal from the non-matching signal sending means, and for generating an alarm when the non-matching signal becomes effective. . 4. An information processing system having a circuit board connectable to another circuit board by a plurality of cables, comprising a receiving section of the misconnection detecting device corresponding to each connector existing on the circuit board. The misconnection detecting device according to claim 1, characterized in that the connector portion of each cable is provided with a portion for sending out the misconnection detecting device.