JP2659672B2 - Transceiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitting / receiving apparatus for transmitting / receiving signals between a main controller and a remote controller connected thereto via a transmission cable.

[0002]

2. Description of the Related Art Conventionally, in this type of transmitting / receiving apparatus,
A resistor is inserted between the main controller and the remote controller at the end of the transmission cable connecting the main controller and the remote controller, and the resistance is matched in advance with the characteristic impedance of the transmission cable. , Impedance matching between the main body controller and the remote controller and the transmission cable.

In this type of transmission / reception device, a plurality of remote controllers can be connected in parallel to the main controller via transmission cables, and the number of remote controllers connected to the main controller can be arbitrarily selected. Such is known.

[0004] For example, in a hot water supply bath apparatus, one or a plurality of remote controllers are respectively connected to a main body controller thereof via transmission cables, and each remote controller is connected to one of a kitchen, a washroom, a bathroom, or the like. It is known that a plurality of operation information signals, such as an operation command signal and a hot water temperature signal, are transmitted and received between each remote controller and a main body controller in a plurality of appropriate locations. The number of remote controllers connected to the controller can be appropriately selected according to the user's request, etc., and when using a plurality of remote controllers, each remote controller is connected to the main unit controller via a transmission cable. Connected in parallel.

[0005] In this type of transmitting / receiving apparatus,
The main body controller and each remote controller are provided with a resistor for impedance matching as described above.

However, conventionally, in this type of transmission / reception apparatus, since the resistance value of the resistor for impedance matching is set in advance, there are the following inconveniences.

That is, when the number of remote controllers connected to the main body controller is determined to be a predetermined number, the resistance value of each resistor of the main body controller and the remote controller is determined by the number of remote controllers to be connected. If appropriately set according to this, it is possible to achieve a good impedance matching to some extent, and it is possible to perform transmission and reception between the main body controller and the remote controller without any trouble.

However, like the above-mentioned hot water supply bath apparatus,
When the number of remote controllers connected to the main body controller is not always fixed to a predetermined number, good impedance matching may not be obtained depending on the number of connected remote controllers.

For example, on the remote controller side, as the number of connections increases, the load on the main controller increases, and the signal reception level at each remote controller tends to decrease. It is necessary to appropriately set the resistance value of the matching resistor. However, conventionally, since the resistance value of the resistor for impedance matching is set in advance, depending on the number of connected remote controllers, the impedance matching is not sufficiently achieved, and the signal reception level at each remote controller is significantly reduced. A malfunction of each remote controller may occur. And
In such a case, it is possible to obtain a somewhat good impedance matching by adjusting the length of the transmission cable corresponding to each remote controller, but such adjustment generally requires a high degree of skill. And requires a great deal of labor.

In addition, since the main body controller receives signals individually transmitted from the respective remote controllers, the number of remote controllers connected is not generally affected, but the transmission corresponding to each remote controller is generally not affected. If the lengths of the cables are different, there may be a case where impedance matching with the main unit controller can be sufficiently obtained for some remote controllers, but impedance matching cannot be sufficiently obtained for other remote controllers. In such a remote controller with insufficient impedance matching, the level of a signal from the remote controller to the main controller may be greatly reduced.

[0011]

SUMMARY OF THE INVENTION The present invention solves such inconveniences. Even when the number of remote controllers connected to the main controller and the length of the transmission cable connecting them are not fixed, the main control is not required. It is an object of the present invention to provide a transmission / reception device that can easily obtain good impedance matching between a device and each remote controller, and can transmit and receive signals between the two devices.

[0012]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, a plurality of remote controllers can be connected in parallel via a transmission cable, and a signal is transmitted between the connected remote controllers. And a remote controller provided at each terminal of the main controller and each remote controller at the end of the transmission cable for connecting the main controller and the remote controller for impedance matching between the main controller and the remote controller. And a resistor for detecting a level of a signal transmitted from the main body controller to each remote controller in a transmitting / receiving device common to each remote controller. Detecting means, and a level display for displaying a level of the signal detected by the level detecting means And a stage, characterized in that the resistive element antibody to adjust the resistance value of the resistor of the remote controller is constituted by a variable resistor in accordance with the signal level displayed on the level display section.

Further, second level detecting means for detecting the level of the signal transmitted from each of the remote controllers to the main body controller, and displaying the level of the signal detected by the second level detecting means. And a second display means for adjusting the resistance value of the resistor of the main body controller according to the signal level displayed on the second level display means. It is characterized by having done.

[0014]

According to the present invention, the level of the signal transmitted from the main controller to each of the remote controllers is detected by the level detecting means, and the detected level is displayed on the level display means. By adjusting the resistance value of the variable resistor for impedance matching of each remote controller while checking the level of the displayed signal, the level of the signal from the main body controller to each remote controller is adjusted to an appropriate level. It is possible to obtain good impedance matching between the main body controller and each remote controller regardless of the number of connected remote controllers for transmission and reception of signals from the main body controller to each remote controller. Become.

Further, when the resistor of the main body controller is constituted by a variable resistor and the main body controller is provided with the second level detecting means and the second level displaying means, the second level detecting means is provided. By adjusting the resistance value of the variable resistor for impedance matching of the main controller while confirming the level of the signal displayed on the level display means, the level of the signal from each remote controller to the main controller can be adjusted appropriately. Level can be adjusted, and the transmission and reception of signals from each remote controller to the main unit controller, regardless of the length of the transmission cable corresponding to each remote controller, etc., good impedance of the main unit controller and each remote controller Matching can be obtained.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One example of the present invention will be described with reference to FIG. FIG. 1 is a system configuration diagram of the transmission / reception device of the present embodiment.

In FIG. 1, 1 is a main body controller, 2 is a remote controller (hereinafter, simply referred to as a remote controller) for transmitting and receiving signals to and from the main body controller 1, and 3 is a coaxial connecting the main body controller 1 and the remote controller 2. The transmission cable 3 is a transmission cable composed of a cable or the like. Both ends of the transmission cable 3 are connected to connection terminals 1a and 1b provided on the main body controller 1 side and connection terminals 2a and 2b provided on the remote controller 2 side. . In this case, one or a plurality of remote controllers 2 can be connected to the main body controller 1 via respective different transmission cables 3, and when the number of remote controllers 2 to be connected is plural, as shown in the figure. Each remote controller 2 has a main controller 1
Are connected in parallel via the transmission cable 3 to the connection terminals 1a and 1b. The connection terminals 1a and 2a are signal terminals, and the connection terminals 1b and 2b are ground terminals.
The signal cable 3a of the transmission cable 3 is connected to 2a, and the grounding cable 3b of the transmission cable 3 is connected to the connection terminals 1b and 2b.

The main body controller 1 includes a microcomputer 4
(Hereinafter simply referred to as the microcomputer 4), modulates an information signal generated by the microcomputer 4 into a transmission / reception signal and outputs the signal, and demodulates a transmission / reception signal transmitted from the remote controller 2 and outputs the signal to the microcomputer 4. A transmission / reception circuit 5, a level detection circuit (second level detection means) 6 for detecting an amplitude level of a transmission / reception signal transmitted from the remote controller 2,
A display (second level display means) 7 for displaying the level detected by the level detection circuit 6 and a power supply (DC voltage) for operating the microcomputer 4, the transmission / reception circuit 5, the level detection circuit 6, etc. are supplied from a commercial power supply. And a power supply circuit 8 for generating power.

A transformer 9 is interposed between the transmitting / receiving circuit 5 and the connection terminals 1a and 1b. The primary coil 9a of the transformer 9 is connected to the transmitting / receiving circuit 5, the secondary coil 9b has one end connected to the connection terminal 1b serving as a ground terminal, and the other end connected to the connection terminal 1a serving as a signal terminal. Connected through. Capacitor 10
Is for separating a DC voltage component from a signal transmitted from the remote controller 2 and applying the DC voltage component to the transformer 9.

A variable resistor 11 for impedance matching is connected in parallel with the secondary coil 9b of the transformer 9 at a stage preceding the capacitor 10 (on the side of the transformer 9).
The resistance value of the transmission cable 3 is made variable by an operation of an operation member (not shown) within an appropriate range including the value of the characteristic impedance of the transmission cable 3.

The power supply circuit 8 is connected to the microcomputer 4, the transmission / reception circuit 5, and the level detection circuit 6 so as to supply power for operation thereof. The power supply circuit 8 also generates a power supply for the remote controller 2 connected to the main controller 1, and transmits / receives the transmission / reception signal output from the transmission / reception circuit 5 via the transformer 9 to the capacitor 10. The DC voltage for the power source of the remote controller 2 is superimposed at the subsequent stage (on the side of the connection terminal 1a).

The level detection circuit 6 detects the amplitude level of the transmission / reception signal transmitted from the remote controller 2 on the primary coil 9a side of the transformer 9, and further detects the amplitude of the detected transmission / reception signal. The level is displayed on the display 7.

Each remote controller 2 connected to the main controller 1
Have the same circuit configuration, and the basic circuit configuration is almost the same as the main controller 1.

That is, each remote controller 2 is
Similarly to the above, the microcomputer 12 modulates an information signal generated by the microcomputer 12 into a transmission / reception signal and outputs the signal, and demodulates a transmission / reception signal transmitted from the main body controller 1 and outputs the signal to the microcomputer 12. A transmission / reception circuit 13, a level detection circuit (level detection means) 14 for detecting an amplitude level of a transmission / reception signal transmitted from the main body controller 1, and a display for displaying the level detected by the level detection circuit 14 ( Display means) 15, the microcomputer 12 and the transmission / reception circuit 1
3. A power supply circuit 16 for generating an operation power supply (DC voltage) such as a level detection circuit 14, etc., and a transmission / reception signal is transmitted and received between the transmission / reception circuit 13 and the connection terminals 2a and 2b. The transformer 17 and the capacitor 18 are provided similarly to the main controller 1. A variable resistor 19 for impedance matching is connected in parallel to a secondary coil 17b of the transformer 17 having the primary coil 17a connected to the transmission / reception circuit 13 at a stage preceding the capacitor 18 (on the transformer 17 side). The resistance of the variable resistor 19 is made variable by operating an operation member (not shown) within an appropriate range including the value of the characteristic impedance of the transmission cable 3.

In this case, as described above, the power supply circuit 16 transmits the transmission / reception signal transmitted from the main body controller 1 with the DC voltage superimposed thereon after the capacitor 18 (on the connection terminal 2a side).
The power supply for operation of the microcomputer 12, the transmission / reception circuit 13, the level detection circuit 14 and the like is generated from the DC voltage superimposed on the transmission / reception signal.

Next, the operation of the transmitting / receiving device of the present embodiment will be described.

In the transmitting and receiving apparatus of this embodiment, the information signal generated by the microcomputer 4 of the main body controller 1
The transmission / reception signal is output from the transmission / reception circuit 5 to the connection terminals 1a and 1b via the transformer 9 and the capacitor 10.
The DC voltage as a power supply for the remote controller 2 is superimposed by the power supply circuit 8 at a stage subsequent to 0 (on the connection terminal 1a side). And
The transmission / reception signal on which the DC voltage is superimposed as described above is transmitted from the connection terminals 1a and 1b to the respective remote controllers 2 connected thereto via the transmission cable 3.

The transmission / reception signal transmitted to each remote controller 2 is input to the transmission / reception circuit 13 via the transformer 17 after the DC voltage component is removed by the capacitor 18 in each remote controller 2. After the information signal is demodulated from the transmission / reception signal, the information signal is transferred to the microcomputer 12, and the information signal is transmitted from the main body controller 1 to the microcomputer 4 as described above.

The transmission of the information signal from each remote controller 2 to the main controller 1 is performed in the same manner as described above.

The transmission / reception operation described above is a basic operation of the transmission / reception device of the present embodiment. In this transmission / reception operation, if the impedance matching between the main body controller 1 and each remote controller 2 is not sufficiently achieved. However, the level of the transmission / reception signal on the receiving side is greatly reduced, and the necessary information signal cannot be completely demodulated. As a result, the transmission / reception device may malfunction.

Therefore, in the transmitting / receiving device of the present embodiment, impedance matching between the main body controller 1 and each remote controller 2 is performed as follows.

That is, in the transmitting / receiving apparatus of the present embodiment, the microcomputer 4 of the main body controller 1 generates a test information signal by operating a switch or the like (not shown). After being modulated into a signal for transmission and reception by the transmission and reception circuit 5 as described above, the signal is transmitted to each remote controller 2 connected to the main body controller 1.

At this time, in each remote controller 2, the amplitude level of the transmission / reception signal transmitted from the main body controller 1 is detected by the level detecting circuit 14 on the primary coil 17a side of the transformer 17 of each remote controller 2, and the detection is performed. The set level is displayed on the display 15.

Then, the installer of the transmission / reception apparatus checks the level of the transmission / reception signal transmitted from the main body controller 1 for each remote controller 2 on the display 15, and the signal level of each remote controller 2 The resistance value of the variable resistor 19 for impedance matching is adjusted via an operation member (not shown) so as to have an appropriate level. Thereby, regarding transmission / reception of transmission / reception signals from the main body controller 1 to the respective remote controllers 2, regardless of the number of connected remote controllers 2, etc.
Good impedance matching between the main body controller 1 and each remote controller 2 can be obtained. Such an adjustment operation can be easily performed because the resistance value of the variable resistor 19 may be adjusted while checking the level of the signal displayed on the display 15.

Further, in the transmitting / receiving apparatus of this embodiment,
The microcomputer 12 of each remote controller 2 also generates a test information signal by operating a switch (not shown), and the test information signal is modulated by the transmission / reception circuit 13 of each remote controller 2 into a transmission / reception signal. Is transmitted from the remote controller 2 to the main controller 1.

At this time, in the main body controller 1, the level detection circuit 6 detects the amplitude level of the transmission / reception signal transmitted from each remote controller 2 on the primary coil 9a side of the transformer 9 of the main body controller 1. The detected level is displayed on the display 7.

In this case, when the lengths of the transmission cables 3 corresponding to the respective remote controllers 2 are substantially the same, the resistance value of the variable resistor 11 for impedance matching of the main body controller 1 is previously determined for each transmission cable 3. If the value of the characteristic impedance is adjusted to be substantially the same as the value of the characteristic impedance, the amplitude level of the transmission / reception signal transmitted from each remote controller 2 becomes approximately an appropriate level, but the length of each transmission cable 3 differs. In some cases, depending on the resistance value of the variable resistor 11, the remote controller 2 may cause the amplitude level of the transmission / reception signal received by the main body controller 1 to not reach an appropriate level.

In such a case, the transmitter / receiver installation company or the like checks the level of the transmission / reception signal transmitted from the main body controller 1 from each remote controller 2 on the display 7 while checking the level of the signal. The resistance value of the variable resistor 11 for impedance matching is adjusted via an operator (not shown) so that the level becomes an appropriate level for each remote controller 2. Thereby, regarding transmission / reception of transmission / reception signals from each remote controller 2 to the main controller 1, regardless of the length of the transmission cable 3 corresponding to each remote controller 2, good impedance matching between the main controller 1 and each remote controller 2 is achieved. Can be easily obtained.

When the resistance value of the variable resistor 11 is adjusted, the impedance matching between the main controller 1 and each remote controller 2 may be shifted with respect to the transmission and reception of the transmission / reception signal from the main controller 1 to each remote controller 2. However, in such a case, the variable resistor 19 of each remote controller 2 is again set as described above.
May be adjusted.

As described above, according to the transmission / reception device of the present embodiment, the main controller 1 can be controlled by adjusting the resistance values of the variable resistors 11 and 19 irrespective of the number of connected remote controllers 2 and the length of the transmission cable 3. In addition, good impedance matching between the remote controllers 2 can be easily achieved.

In this embodiment, each remote controller 2 is provided with the display 15 for displaying the amplitude level of the transmission / reception signal. However, for example, in a hot water supply bath, each remote controller has a set hot water temperature. Since a display is provided, the level of the transmission / reception signal may be displayed on the set hot water temperature display.

In the present embodiment, the level of the signal for transmission and reception is detected by the primary coils 9a and 17a of the transformers 9 and 17, but may be detected by the secondary coils 9b and 17b. .

In this embodiment, the resistances 11, 1 for impedance matching of both the main body controller 1 and the remote controller 2 are set.
9 is constituted by a variable resistor, but when the length of the transmission cable 3 corresponding to each remote controller 2 is defined to be substantially the same length, the impedance matching resistor of the main body controller 1 is replaced by For example, it may be configured by a fixed resistor having a resistance value substantially equal to the characteristic impedance of each transmission cable 3.

[0044]

As apparent from the above description, according to the present invention, the level of the signal transmitted from the main controller to each remote controller is detected by the level detecting means, and the level is detected by the level displaying means. By displaying the variable resistor so that the resistance value of the resistor for impedance matching of each remote controller can be adjusted according to the displayed signal level, each remote controller can be controlled by the main body controller. The signal from the main body controller to each remote controller is adjusted simply by adjusting the resistance value of the variable resistor of each remote controller while checking the signal level to the controller by the level display means and adjusting the signal level to an appropriate level. Transmission depends on the number of remote controllers connected and the length of the transmission cable for each remote controller. In the optimum impedance matching between the body controller for each remote controller can be easily obtained, it is possible to satisfactorily perform reception of a signal from the main controller in the remote controller at the proper level.

Further, the level of the signal transmitted from each remote controller to the main controller is detected by the second level detecting means, and the detected level is displayed by the second level display means. The variable resistor is used to adjust the resistance value of the resistor for impedance matching of the common body controller for each remote controller according to each remote controller. While the signal level to the device is checked by the second level display means, the resistance value of the variable resistor of the main body controller is adjusted and the signal level is adjusted to an appropriate level. Regarding the transmission of signals to the remote controller, regardless of the length of the transmission cable for each remote controller, A good impedance matching with each remote controller can be easily obtained while avoiding variations in the dance matching, and the reception of signals from each remote controller in the main unit controller at an appropriate level can be easily achieved for any remote controller. Can be performed well. Therefore, according to the present invention, regardless of the number of connected remote controllers and the length of the transmission cable,
Signals can be transmitted and received between each remote controller and the main body controller satisfactorily on both the remote controller side and the main body controller side.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of an example of a transmission / reception device of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Main body controller, 2 ... Remote controller, 3 ... Transmission cable, 6, 14 ... Level detection circuit (level detection means), 7, 15 ... Display (level display means), 11, 1
9: Variable resistance.

Claims (2)

(57) [Claims] A plurality of remote controllers which can be connected in parallel via a transmission cable, and which transmits / receives signals to / from each of the connected remote controllers; and a said body controller at the position of the end portion of the transmission cable and the resistor which is provided in each re <br/> remote controller connected both to achieve impedance matching between the controller and the main body control The resistor of the device is
In transceiver device it is common to controllers, before Symbol
A level detecting means for detecting a level of a signal transmitted from the main body controller to each remote controller; and a level display means for displaying a level of the signal detected by the level detecting means; Show on
In front of the remote controller according to the signal level
The resistor is changed to a variable resistor in order to adjust the resistance value of the resistor.
Transmitting and receiving apparatus is characterized in that more configurations. 2. A pre-Symbol second level detecting means for detecting the level of the signal transmitted from the respective remote controller to the main controller, the level of said detected signal by the level detection means of the second Second display means for displaying, and the signal level displayed on the second level display means.
Adjust the resistance value of the resistor of the main body controller in accordance with
2. The transmission / reception device according to claim 1, wherein said resistor is constituted by a variable resistor .