JPS6029677A - Induction line monitoring device - Google Patents

Abstract

PURPOSE:To decide whether at least the cause is due to the disconnection of an induction line or not, in case a communication failure has occurred, by superposing a direct current onto an AC signal on the induction line, and detecting whether its direct current exists or not. CONSTITUTION:An AC signal from an AC signal generator 25 flows through a closed section of a capacitor 26, induction line 23A, filter 32', terminal resistance 31, induction line 23B and a capacitor 27. In this case, as for a generated magnetic field, a transfer purpose of an information detected by a receiving device 24 is attained. On the other hand, a direct current flows through the closed section of a choke coil 29, the induction line 23A, a light emitting element 34, the terminal resistance 31, the induction line 23B and the negative terminal of a DC power source 28, from the positive terminal of the DC power source 28. In case the DC power source 28 is reversed in polarity the current flows in the opposite direction, and the current flows to a light emitting element 33. As for the current flowing to the light emitting element, a DC voltage of the DC power source device 28 is set variably in accordance with a constant of the terminal resistance 31 so that the suitable current flows.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a guide wire monitoring device, and is a device that constantly monitors whether electric wires (guide wires) installed for transmitting data and audio are not disconnected.

A data transmission device or communication device using guided radio has a conventional configuration as shown in FIG.

In this device, an AC signal is passed through the guide wires 13A and 13B, and the receiving device 16 detects the magnetic field generated around the wires to perform communication. According to this system, when communication becomes defective, it is possible to determine whether the signal generator 12 at the transmitting end is out of order, the guide wire 13A or 13B is broken and the signal current no longer flows, or the receiving device 16 is out of order or I can't decide if the sensitivity has decreased. 14 is a terminator, terminating resistor 1
5.

This invention was made in order to deal with the above-mentioned situation, and when a communication failure occurs, it is possible to at least determine whether or not the cause is due to a disconnection of the induction wire. The object of the present invention is to provide a guiding wire monitoring device that can completely detect the presence or absence of direct current by superimposing the DC current and clarify the cause of the failure.

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

Figure 2 shows an embodiment of this invention, where 2 is a transmitter;
2 is a terminator, 23A and 23f3 are guide wires, and 24 is a receiving device.

In the transmitter '2', 25 is an AC signal generator of a data transmission device or communication device, which serves as a signal source. Terminal 25A of this AC signal generator 25.

25B are connected to output terminals 21A and 21f3 of the transmitter 21 via capacitors 26 and 27f, respectively. The capacitors 26 and 27 are capacitors that have a high resistance value for direct current and a low impedance for alternating current signals used in communication devices.

Next, 28 is a DC power supply. The positive terminal of this DC power supply 28 is connected to the output terminal 21 via the choke coil 29, and the negative terminal is directly connected to the output terminal 21f3. The choke coil 29 is a choke coil having a low resistance value for direct current and a sufficiently high impedance for alternating current signals relative to the resistance value of the terminating resistor 31.

Next, the terminator 22 side will be explained. -122A, 22B are
The guide wires 23A and 23B are connected to the terminals. In the terminator 22, an f-wave device 32 and three termination resistors are connected in series between the terminals z2A and 2:zB. Furthermore, light emitting elements 33 .
34 are connected. The P-wave device 32 is an R-wave device that has a sufficiently low resistance value compared to the resistance value of the terminating resistor 31, and its purpose is to prohibit alternating current from flowing to the light emitting element and prevent it from emitting light due to the alternating current power source. There is.

In the above configuration, the AC signal from the AC signal generator 25 is transmitted to the capacitor 26, the guide wire 23A1r waveform generator 37? ',
It flows through the closed section of the terminating resistor 3, the induction wire 23B, and the capacitor 27. At this time, the generated magnetic field is detected by the receiving device 24, and the purpose of information transmission is achieved. On the other hand, the DC current flows from the positive terminal of the DC power supply 28 to the choke coil 29,
Induction i! j! It flows through the closed section of the negative terminal of the 23A1 light emitting element 34, the terminating resistor 3, and the negative terminal of the guiding wire 23B1 DC power supply 28.

When the polarity of the DC power supply 28 is reversed, the current flows in the opposite direction of the two-axis flow, and the current flows to the light emitting element 33. The DC voltage of the DC power supply device 28 is variably set according to the constant of the terminating resistor 31 so that a current suitable for the current flowing through the light emitting element flows. In the case of this example, the guide wire, ? Since JA has positive polarity, if the light-emitting element 33 is wired so that it has positive polarity, the light-emitting element 33 will emit light. do.

Since it operates as described above, the guide wire 23A.

If 23B is not disconnected, one of the light emitting elements 33 and 34 emits light. Further, the light emitting elements 33 and 34, in which different electrodes are connected in parallel, also serve to prevent reverse voltage breakdown of the other light emitting elements due to the forward voltage drop.

The light emitting situation of the light emitting elements 33 and 34 above is similar to that of the light receiving element 35.
, J6, respectively.

When the light receiving elements 3, 5, and 36 detect a certain amount of optical energy or more, they obtain a logic "1° (or 0°)" as an output signal, and input this to the OR circuit 37.

As a result of the above configuration, according to the present device, when the guide wires 23A and 23f3 are not disconnected, the light emitting element 3
3. Either one of 34 emits light and the output of the OR circuit 37 is always logic '1' (or °01), and when the logic is reversed, it means that the guiding wire is disconnected.Also, Since one of the light emitting elements 33, , ?4 will emit light, these signals may be detected by an exclusive OR circuit. The embodiment shown in Fig. 3 is similar to Fig. 1 and Fig. 2 in which disconnection detection can be performed on the end transmitter 21 side. To explain further, in this embodiment, an f-wave device 40 is connected between the terminal 21B and the capacitor 27.
All the light emitting elements 41 are connected in series, and the light emitting elements 41 are connected in parallel. In the case of this embodiment, since the supply status of the DC power source 28 is clear and its polarity is known in advance, one light emitting element is provided for all four light emitting elements.

43 is a normal diode, which is used to completely prevent reverse breakdown voltage. Therefore, in this case, the output of the light receiving element 42 provided corresponding to the light emitting element 41 itself can be used as a detection signal.

The relationship between the light emitting element and the light receiving element shown in Figs. 2 and 3 is as follows:
These elements may be provided all around the photocoupler, which is integrated in advance. In this case, the light emitting element and the light receiving element have a one-to-one correspondence, so in the case of the embodiment shown in Fig. 2, a logic circuit is required. By combining elements, it is possible to configure the element to have an OR function by itself.

As described above, the present invention can provide a guide wire monitoring device that can at least determine whether or not the cause of communication failure is due to disconnection of the guide wire.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a conventional guided radio communication system, FIG. 2 is a configuration explanatory diagram showing one embodiment of the present invention, and FIG. 3 is a configuration explanatory diagram showing another embodiment of the present invention. . 21...Sender, 22...Terminator, 23A, 23B.
...Guiding wire, 24...Receiving device, 25...AC signal generator, 26.27...Capacitor, 28...DC power supply, 3...Terminal resistor, 32+ 40...p Wave device, 33+ 34+41... Light emitting element, 35, 36.
42... Light receiving element.

Claims (1)

[Claims] (l) A first electrode having one electrode connected to both output terminals of the signal generator. A series circuit that combines a second capacitor, a first 63-wave conductor, a terminating resistor, and a second conductive wire between the other electrode of the first capacitor and the other electrode of the second capacitor. A closed loop consisting of a DC power source that provides positive and negative outputs between the other 5 poles of the first and second capacitors, and a DC current from the DC power source that is provided in parallel with the i'' wave generator. (2) A guiding wire monitoring device patented as having a detecting means for detecting breakage of the closed/loose wire. A detection signal is obtained from a light receiving element that is sensitive to the light emitting output of the light emitting element. (3) The guide wire monitoring device according to claim 1, characterized in that the r-wave device and the detection means are provided on the terminator side. (4) The r-wave device and the detection means 2. The guide wire monitoring device according to claim 1, wherein the means is provided on the transmitter side.