JPH0385829A - Transmission/reception controller for transmitter-receiver - Google Patents

Abstract

PURPOSE:To realize the confirmation of installation state and the recognition of battery voltage lowering of a transmitter simultaneously with a simple circuit by sending a low level transmission code in a transmission signal from the transmitter and detecting whether or not the low level transmission code is to be received. CONSTITUTION:A code sent at first by a low level signal generating means 10 among 4 consecutive codes sent from a transmitter 1 has a weaker level than the remaining 3 codes by a high level signal generating means 9. At the installation of a transmitter-receiver, the installation state such as the deviation of an optical axis between the transmitter 1 and the receiver 8 is confirmed depending whether or not a low level code among the series of data is received by a transmitter-receiver installation confirming means 12. Moreover, when a battery voltage is low, a transmitter battery voltage deciding means 13 cannot correctly receive and decode only a first code, then it is judged that the battery voltage is low. Thus, the installation state of the transmitter 1 and the receiver 8 is confirmed and the lowering in the battery voltage of the transmitter 1 after movement is detected with the simple circuit constitution.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a transmitter/receiver that transmits data by infrared rays from a battery-powered transmitter, and performs some kind of control by receiving and decoding the data by a receiver. This transmission/reception control device is used for electric shutters in garages, etc.

<Prior Art> As shown in FIG. 6, a conventional battery-driven transmitter 1 includes a battery 2, a light-emitting element 3 consisting of a light-emitting diode, a transistor Ql for switching and driving the light-emitting element 3, and a transmitter 1 that is connected to an obstacle. A control circuit 5 controls the energization of the transistor Q1 based on the output from the detection switch 4 which is turned on when
6 is a resistor for limiting the current flowing through the light emitting element 3.

Conventionally, when installing a transmitter/receiver, in order to check the installation status, such as adjusting the optical axis of the infrared light emitting element 3 of the transmitter 1 and the light receiving element of the receiver, checking for misalignment of the optical axis, etc. An installation status confirmation switch is provided to reduce the power output from the original output power, and when checking the installation status, the switch is operated to perform transmission and reception.

Furthermore, in general, when the battery voltage of the transmitter decreases, the power of the infrared signal to be transmitted generally decreases, resulting in a decrease in transmission performance.

Therefore, conventionally, in order to notify the receiver that the battery voltage of the transmitter 1 has decreased after the transmitter/receiver is in operation, a battery voltage detection circuit 7 is provided inside the transmitter I, and a Data regarding the battery voltage was included in the data sent to the receiver in advance, and the drop in battery voltage was sent to the receiver as data.

In this way, conventional transmitters are equipped with two separate circuits: a power-down switch (test switch) for checking the installation status, and a 6" circuit for detecting a drop in battery voltage after operation. Ta.

Problems that the invention seeks to solve I2 〉However,
In the above-mentioned conventional technology, it is wasteful to provide the installation status confirmation switch and the battery voltage detection circuit separately because they function independently and have no correlation.

In view of the above, the present invention shares the functions of checking the installation status of the transmitter and receiver when installing the transmitter and receiver, and detecting a drop in the battery voltage of the transmitter after operation using a simple circuit configuration, and can be realized at the same time. The purpose of this invention is to provide a transmission/reception control device for a transmitter/receiver.

<Means for Solving the Problems> As shown in FIGS. 1 to 5, the means for solving the problems according to the present invention includes a battery-driven transmitter I that transmits signals by infrared rays, and a transmitter I that receives signals from the transmitter 1. In the transmitter/receiver, the transmitter 1 includes a high level signal generation means 9 for generating a high level transmission code, and a low level signal generation means 10 for generating a low level transmission code. The transmitting signal is composed of high-level and low-level transmitting codes, and the receiver 8 side includes a receiving means 11 for receiving the transmitting signal from the transmitter V, and a low-level transmitting code of the receiving means 2. a transmitter/receiver installation confirmation means 12 for confirming the installation status of the transmitter/receiver by receiving the above information; This includes a transmitter battery voltage determination means L3 for determining the voltage of the transmitter battery.

In the two-legged problem solving means, the transmitter 1 transmits the same signal code four times in succession, as shown in FIG. Among the four consecutive codes transmitted by the transmitter 1, the first code transmitted by the low level signal generating means 1.0 has a higher level than the remaining three codes transmitted by the high level signal generating means 9. It is weakened.

When installing the transmitter/receiver (including when replacing the battery), i.e. when the transmitter is installed
If the battery voltage is high, the transmitter/receiver installation confirmation means 12
Based on whether or not a low-level code in a series of data is received, the installation situation such as misalignment of the optical axes of the transmitter 1 and receiver 8 is confirmed.

In addition, if the level of the low-level transmission code is set lower than the high-level transmission code when the battery voltage drops, it is possible to transmit and receive correctly even when the battery voltage drops. This can be done by checking in advance.

Next, after the transceiver is in operation, if the battery of the transmitter 1 is old and the battery voltage is low, if all four consecutive codes are correctly received and decoded by the transmitter battery voltage determining means 13,
The battery voltage is determined to be normal, and if only the first code cannot be correctly received and decoded, the battery voltage is determined to be low. Alternatively, you can include information that the battery voltage is being checked in the low-level transmission code of the 4 consecutive transmissions, and when that code can be received and decoded correctly, it is determined that the battery voltage is normal, and the code is received and decoded correctly. If this is not possible, it may be determined that the battery voltage is low F.

Therefore, by transmitting a low-level transmission code in the transmission signal from the transmitter l and detecting whether or not the low-level transmission code can be received, it is possible to It is possible to simultaneously check the installation status, such as checking for misalignment of the optical axis with the receiver, and to recognize a drop in the battery voltage of the transmitter after operation, using a simple circuit.

<Example> Hereinafter, an example in which the transmitter/receiver of the present invention is applied to a safety device for an electric shutter will be described based on the drawings. FIG. 1 is a functional block diagram of a transmission/reception control device showing an embodiment of the present invention;
Figure 2 is a configuration diagram of the electric shutter of this embodiment, Figure 3 is an electrical circuit diagram of the transmitter, Figure 4 is a control block diagram of the receiver, and Figure 5 is the waveform of the transmission signal from the transmitter. It is a diagram.

It should be noted that the same reference numerals are given to the same components as before.

As shown in FIG. 1, the transceiver of the present invention is comprised of a battery-driven transmitter 1 that transmits a signal by infrared rays, and a receiver 8 that receives and decodes the signal from the transmitter 1. Machine! A high-level signal generation means 9 for generating a high-level transmission code and a low-level signal generation means 10 for generating a low-level transmission code are provided on the side, and the transmission signal is composed of the high-level and low-level transmission codes. On the side of the receiver 8, there is a receiving means 11 for receiving the transmission signal from the transmitter 1, and by receiving the low level transmission code of the receiving means Kl, the communication between the transmitter 1 and the receiver 8 is established when the transmitter/receiver is installed. Transmitter/receiver installation confirmation means 12 for confirming the installation status; and transmitter battery voltage for determining a decrease in the battery voltage of the transmitter l based on whether or not a low-level transmission code of the transmission signal can be received after the transceiver is activated. The determination means 13 is also provided.

As shown in FIG. 2, the electric shutter safety device using the transceiver of the present invention includes an obstacle detection switch 4 such as a limit switch attached to the bottom end of the shutter curtain 14, A transmitter 1 is attached to the seat plate 15 and transmits an infrared signal upward when the detection switch 4 detects an obstacle, and a transmitter 1 receives the transmitted signal from the transmitter above the transmitter 1. and a receiver 8 for decoding the information.

The receiver 8 includes a receiving section 16 such as a photodiode placed above the shutter, and a shutter control device 1 that decodes signals from a transmitter 1 and controls driving and stopping of the shutter.
7, and an opening/closing machine I8 such as a motor for opening and closing the shutter curtain 14. In addition, 19 in the figure is a push button type opening/closing switch for opening and closing the shutter at hand.
This is Tsuji.

As shown in FIG. 3, the transmitter 1 includes a battery 2 as a power source, a light emitting element 3 made of an infrared light emitting diode, a first transistor Q1 and a second transistor Q2 for driving the light emitting element 3, and the The control circuit 5 includes a control circuit 5 that controls energization of the first transistor Q1 and the second transistor Q2 based on the output from the detection switch 4, and resistors 20 and 21 that limit the current flowing through the light emitting element 3. In addition,
22, 23, and 24 are resistances.

The high level signal generating means 9 is composed of first and second transistors Ql and Q2, and a control circuit 5 (microcomputer) that turns on the second transistor Q2 and turns on and off the first transistor Q1. The low level signal generating means IO includes first and second transistors Q1 . Q
2, and a control circuit 5 (microcomputer) that turns off the second transistor Q2 and turns on and off the first transistor Ql.

Here, the voltage when the battery 2 is new is V ec 1 s, the voltage when it is old and needs to be replaced is Vec2, the forward voltage of the light emitting element 3 is VP, and the resistance value of the resistor 20.21 is 1'11. ．． If R2, the current flowing through the light emitting element 3 is
(the on-voltage of the first and second transistors QI and Q2 can be ignored), at a high level transmission code when the battery is new, (Vccl - VF)/R1 = 11 Similarly, at a low level transmission code, (Vcci -VF)/(1,1+R2)-12 For high level transmit code when the battery is old, (Vee2-VF)
/RI = 13 Similarly, for a low-level transmission code, (Vcc2-VF)/(R1+R2)=14.

The light emitting power from the light emitting element 3 is almost proportional to the current flowing through the light emitting diode, and R1 and R2 are set so that reception is possible with the light emitting power at the current of I2, and reception is impossible with the light emitting power at the current of I4. It is sufficient to select the resistance value of .

In addition, considering the variation in the light emission power of the light emitting element 3, I
In order to increase the value of 2/14, replace the resistor 21 with a series circuit of a resistor and a diode so that Vcc2<VF+0
．． It is sufficient that 6V (diode forward voltage) Vccl>VP+0.6V.

As shown in FIG. 4, the printer control device 17 includes a printer control circuit 25 consisting of a microcomputer that controls the opening and closing of the shutter, and a printer control circuit 25 that converts the transmission signal from the transmitter 1 received by the receiver 16 into a logic level to control the printer. A receiving circuit 26 that transmits signals to the circuit 25, an input circuit 27 that transmits signals from the open/close switch 19 to the shutter control circuit 25, and a relay and relay drive for operating the switch 18 using the output from the shutter control circuit 25. It is composed of a lifting circuit 28 consisting of a circuit.

The receiving means it includes the receiving section 16 and a receiving circuit 26, and outputs the received transmission signal from the transmitter 1 to the shutter control circuit 25.

Further, the shutter control circuit 25 includes the transmitter/receiver installation confirmation means I2 and the transmitter battery voltage determination means 13. The transmitter/receiver installation confirmation means 12 outputs a signal when the installation situation is abnormal due to a misalignment of the optical axis between the transmitter 1 and the receiver 8, etc., and a display device 29 is provided for notifying the abnormality based on the output signal. ing. Further, the display device 29 is
It also has a function of notifying a drop in battery voltage using an output signal when the transmitter battery voltage determining means 13 detects a drop in battery voltage after the transmitter/receiver is in operation.

In the above configuration, as shown in FIG. 5, when the input of the detection switch 4 changes from OFF to ON due to contact with an obstacle, the transmitter 1 sends the same signal code (stop command to the shutter) four times in a row. . The receiver 16 and the shutter control circuit 25 receive and decode any one of the four consecutively sent codes, and if determined to be valid, stop the shutter. Also, among the four consecutive codes transmitted by the transmitter 1, the first code to be transmitted is generated by the low level signal generating means 10, the remaining three codes are generated by the high level signal generating means 9, and the first code is generated by the high level signal generating means 9. is weakened in its level compared to the rest of the code.

When installing the transmitter/receiver (including when changing the oil), that is, transmitter 1
If the battery 2 is new and the battery voltage is high, check the installation status, such as misalignment of the optical axis of the transmitter 1 and receiver 8, by checking whether the low level part of the series of data is received. . If there is any abnormality in the installation situation, the display device 29 will notify you. Also, if the level of the low-level transmission code is set lower than the high-level transmission code when the battery voltage drops, the voltage/11! It is also possible to confirm in advance at the time of installation (including when replacing batteries) that transmission and reception can be performed correctly even if the voltage drops.

Next, after the transmitter/receiver is in operation, if the battery of the transmitter l becomes old and the battery voltage is low, the receiver 16 and the shutter control circuit 25 correctly receive and decode all four transport codes from the transmitter l. If so, the battery voltage is determined to be normal, and if only the first code cannot be correctly received and decoded, the battery voltage is determined to be low. Alternatively, you can insert the information that 71 voltage is being checked into the low-level transmission code of the 4 consecutive transmissions, and when the code can be correctly received and decoded, it is determined that the battery voltage is normal, and the code is correctly received and deciphered. If it cannot be deciphered, it may be determined that the battery voltage is low. If there is a drop in battery voltage, the display 2229 will notify you.

Therefore, by transmitting a low-level transmission code in the transmission signal from the transmitter l and detecting whether or not the low-level transmission code can be received, it is possible to It is possible to simultaneously check the installation status, such as checking for misalignment of the optical axis with the receiver, and to recognize a drop in the battery voltage of the transmitter after operation, using an internal circuit.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the embodiments described in L within the scope of the present invention.

The transmitting/receiving control device for a transmitting/receiving device of this embodiment is not limited to an electric shutter, but may be applied to other devices that perform remote control.

<Effects of the Invention> As is clear from the above description, according to the present invention; 1-
rnlnllllr-;aLzbeIb;fuitall-
￥t, -Intermediate Ih t On the receiver side, there is a receiving means for receiving the transmission signal from the transmitter, a transmitter-receiver installation confirmation means for checking the installation status of the transmitter-receiver by receiving the low-level transmission code of the receiving means, and a transmitter-receiver installation confirmation means for confirming the installation status of the transmitter-receiver by receiving the low-level transmission code of the receiving means, and and a transmitter battery voltage determination means for determining a decrease in the battery voltage of the transmitter based on whether or not a low-level transmission code of the transmission signal can be received. Check the installation status, such as checking for misalignment of the optical axis with the
This has the excellent effect of being able to share the recognition of the battery voltage drop in the transmitter after operation with a simple circuit, and also realizing it at the same time.

[Brief explanation of drawings]

Fig. 1 is a functional block diagram of a transmission/reception control device showing an embodiment of the present invention, Fig. 2 is a configuration diagram of an electric shutter of this embodiment, Fig. 3 is an electric circuit diagram of a transmitter, and Fig. 4 is a similar diagram. FIG. 5 is a control block diagram of the receiver, FIG. 5 is a waveform diagram of a transmission signal from the transmitter, and FIG. 6 is an electric circuit diagram of a conventional transmitter. 1; transmitter; 8; receiver; 9: high-level signal generation means;
lO: Low level signal generation means, Eye: Receiving means, 12: Transmitter/receiver installation confirmation means, 13: Transmitter battery voltage determination means. Applicant Sharp Corporation

Claims (1)

[Claims] In a transmitter/receiver consisting of a battery-powered transmitter that transmits a signal using infrared rays, and a receiver that receives and decodes the signal from the transmitter, the transmitter side has a high-level transmitter that generates a high-level transmission code. A level signal generation means and a low level signal generation means for generating a low level transmission code, the transmission signal is composed of the high level and low level transmission codes, and the transmission signal from the transmitter is transmitted to the receiver side. a transmitter/receiver installation confirmation means for confirming the installation status of the transmitter/receiver by receiving the low-level transmission code of the receiving means; 1. A transmitting/receiving control device for a transmitting/receiving device, comprising: transmitter battery voltage determining means for determining a decrease in battery voltage of the transmitter based on whether or not reception is possible.