JP2907075B2 - Cable wiring connection monitoring method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable wiring connection monitoring system for connecting cables between devices.

[0002]

2. Description of the Related Art Conventionally, when devices are connected via a cable and a connector composed of a plurality of signal lines,
In some cases, accidents such as incorrect connection of cables, disconnection of signal lines, and short circuits occurred. Therefore, as a means for monitoring these accidents, the following cable wiring connection monitoring method has been proposed. One is a connection monitoring method (for example, Japanese Patent Application Laid-Open No. 1-193663 or the like) that checks the connection of signal lines by connecting a test device to the outside.
Others assign several signal lines in a cable to a dedicated monitoring line, monitor the connection of only the dedicated monitoring line, and infer the connection state of the entire cable from the connection state of the dedicated monitoring line (for example, Japanese Unexamined Patent Application Publication No. 59-46866).

[0003]

As described above, in the conventional cable wiring connection monitoring system, the former requires the installation of a large-scale test device for connection monitoring outside, and the latter requires only a dedicated monitoring line. Since monitoring is performed, there is a problem that connection monitoring of all signal lines in the cable cannot be performed. The present invention is intended to solve such a problem. By providing a simple cable connection monitoring means in the device, a cable wiring that can monitor the connection state of all signal lines in the cable. It aims to provide a connection monitoring method.

[0004]

In order to achieve such an object, a cable wiring connection monitoring system according to the present invention comprises:
A start signal outputting means for outputting a start signal for notifying the start of connection monitoring processing operation of the first and second cable, provided in (a) in the first device, a first pattern for outputting a fixed pattern signal A generator, provided in the first device, for selecting a fixed pattern signal in response to the start signal and transmitting the fixed pattern signal to the second device on all signal lines of the first cable. And a first selection unit for canceling the selection of the fixed pattern signal in response to the test completion signal, and a first selection unit provided in the second device and configured by the fixed pattern signal transmitted from the first selection unit . If all of the signal lines of the cable is determined to be properly connected, a second monitoring unit for transmitting a test completion signal to the first device, (b) in a second device Output a fixed pattern signal
A second pattern generator for powering and a second device
Provided to select a fixed pattern signal according to the start signal.
This fixed pattern signal is supplied to the first device by the second cable.
Transmitted over all signal lines of the
Selecting unit for canceling the selection of the fixed pattern signal
Provided in the first device and transmitted from the second selector.
All fixed signals of the second cable
If it is determined that the signal line is connected properly,
A first monitoring unit that transmits a test completion signal to the second device . By adopting such a configuration, it is possible to monitor the connection state of all signal lines in the cable simply by providing a simple cable connection monitoring means in the apparatus without using an external test apparatus.

[0005]

Next, details of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the present invention. In the figure, devices 10a and 10b are connected via a cable 1. Both ends of the cable 1 are connected to connectors 5a and 5b, and the cable and the device are electrically connected via the connectors. The device 10a includes a connector 5a, a pattern generator 7a, a selector 6a, a monitor 8a, and a resistor 9a. Similarly, the device 10b includes a connector 5b, a pattern generator 7b, a selector 6b, a monitor 8b,
b, a switch SW is provided.

A cable 1 includes a start line 2 for transmitting a start signal s, N signal lines 3a for transmitting an output signal a, M signal lines 3b for transmitting an output signal b, and a test completion signal a.
j is transmitted and the connection monitoring line 4a and the test completion signal bj
Is transmitted, and both ends are connected to connectors 5a and 5b. Signal lines 3a, 3b
Is constituted by signal lines such as a main signal line through which a signal always flows due to data transmission and the like, an alarm signal line, a switching signal line, a control signal line, and the like. The pattern generator 7a
A predetermined fixed pattern signal is generated, and the fixed pattern signal is output to the selection unit 6a via the N signal lines 3a.

When the start signal s is at the "H" level, the selector 6a selects the output signal a of the device 10a and selects the output signal a of the device 10b.
, And when the start signal s is at the “L” level, the fixed pattern signal output from the pattern generator 7a is selected and transmitted to the monitoring unit 8b installed in the device 10b. The monitoring unit 8b stores in advance the fixed pattern signal output from the pattern generator 7a, and upon receiving the fixed pattern signal transmitted from the device 10a, the monitoring unit 8b compares the received fixed pattern signal with the stored fixed pattern signal. Make a comparison. If the two fixed pattern signals match, it indicates that the signal line 3a of the cable 1 is normally connected, and based on the result, transmits a test completion signal aj to the device 10a. If the two fixed pattern signals do not match, it means that an abnormality such as erroneous connection, disconnection, or short circuit has occurred in the signal line 3a of the cable 1, and the cable 1 needs to be replaced.

The pattern generator 7b, the selector 6b,
The monitoring unit 8a operates in the same manner as described above, and the signal line 3b
Can monitor the connection status. When the switch SW is pressed, the “H” level signal flowing to the start line 2 becomes “L” level. This switch SW constitutes start signal output means. In FIG. 1, the switch SW is installed in the device 10b, but this is an example and the present invention is not limited to this. The connection monitoring processing operation of the cable wiring connection monitoring system of the present invention having the above configuration will be described with reference to the flowchart of FIG. FIG. 2A shows the signal line 3a.
3 is a flowchart showing the connection monitoring processing operation of FIG. Switch SW
Is pressed, the start signal s switches from the "H" level to the "L" level (step S1a).

[0009] The selection unit 6a receives an "L" level start signal s
Is received, the fixed pattern signal output from the pattern generator 7a is selected and output (step S2).
a). This fixed pattern signal is transmitted to the monitoring unit 8b installed in the device 10b via the connector 5a, all the signal lines 3a, and the connector 5b (Step S).
3a). The monitoring unit 8b compares whether the received fixed pattern signal matches the fixed pattern signal stored in the monitoring unit 8b in advance (step S4a). If the connection of all signal lines 3a is normal,
All of the fixed pattern signals match.

When the two fixed pattern signals match, the monitoring unit 8b transmits a test completion signal aj to the selection unit 6a (step S5a). Upon receiving the test completion signal aj, the selection unit 6a cancels the selection of the pattern generator 7a (Step S6a), and ends the connection monitoring processing operation. At this time, the selector 6a selects and outputs the output signal a. This output signal a is transmitted into the device 10b via the connector 5a, the signal line 3a, and the connector 5b. Monitoring unit 8b
In step S7, if at least one of the two fixed pattern signals does not match, an alarm is issued to notify the abnormality of the connection state and the cable 1 is replaced (step S7).
a). Then, the connection monitoring processing operation is performed again on the connection state of the replaced cable 1 (step S1a). FIG.
(B) is a flowchart showing a connection monitoring processing operation of the signal line 3b. This is performed in the same manner as in FIG.

[0011]

As described above, according to the present invention, the fixed pattern signal is output from the selection unit of the first device by the start signal, and this signal is output to the second device via the connector and the signal line in the cable. To monitor the status of the fixed pattern signal and check the connection status of the connectors and signal lines, so that simple cable connection monitoring means can be used without using a large-scale external testing device. The erroneous connection of the cable, the disconnection of the signal line in the cable, the short circuit, and the like can be easily monitored only by providing the device in the device.
In addition, since the connection state of all signal lines in the cable can be monitored when the cable is connected, it is possible to perform monitoring with higher reliability than the conventional one.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a flowchart showing a connection monitoring processing operation on signal lines 3a and 3b in FIG.

[Explanation of symbols]

1 ... Cable, 2 ... Start line, 3a, 3b ... Signal line, 4
a, 4b ... connection monitoring line, 5a, 5b ... connector, 6a,
6b ... selection unit, 7a, 7b ... pattern generator, 8
a, 8b: monitoring unit, 9a, 9b: resistance, 10a, 10b
... device, SW ... switch, s ... start signal, aj, bj ...
Test complete signal.

Claims (3)

(57) [Claims] And 1. A first and second devices, the first case and <br/> Buru, in the apparatus system connected via a second cable and a connector, the first and second cable (A) a first pattern generator provided in the first device and outputting a fixed pattern signal; and a first device. The fixed pattern signal is selected according to the start signal, transmitted to all the signal lines of the first cable to the second device, and fixed according to the test completion signal. Deselect the pattern signal
When it is determined that all signal lines of the first cable are normally connected by the fixed pattern signal provided in the first selection unit and the second device and transmitted from the first selection unit A second monitoring unit that transmits a test completion signal to the first device ; and (b) a fixed pattern signal that is provided in the second device and outputs a fixed pattern signal.
A second pattern generator for powering and a fixed pattern provided in the second device in response to the start signal.
Signal and select this fixed pattern for the first device.
Send the signal over all signal lines of the second cable and
Deselection of fixed pattern signal according to test completion signal
A second selection unit provided in the first device and the second selection unit;
2nd cable by the fixed pattern signal transmitted from
It is determined that all signal lines of the
In the case, a test completion signal is transmitted to the second device.
A monitoring system for cable connection connection, comprising: a first monitoring unit . 2. The method according to claim 1, wherein the selecting unit cancels the selection of the fixed pattern signal when receiving the test completion signal transmitted from the monitoring unit,
A cable output connection monitoring system for selecting an output signal of the device and outputting the selected signal to a second device. 3. The pattern generator according to claim 1, wherein the pattern generator is provided in the second device and outputs a fixed pattern signal, and the pattern generator is provided in the second device and selects the fixed pattern signal according to a start signal. A selection unit for transmitting the fixed pattern signal to the first device through all the signal lines of the cable, and canceling the selection of the fixed pattern signal in response to the test completion signal; If the fixed pattern signal transmitted from the selection unit determines that all the signal lines of the cable are normally connected, the test completion signal is sent to the second
And a monitoring unit for transmitting to the device.