JPH0142539B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a remote control system using two-wire digital signal transmission, and in particular, it simplifies the structure of signal packets and transmits and receives information to quickly and accurately transmit information. Regarding equipment.

Conventional configuration and its problems Conventionally, when controlling household energy equipment such as a gas water heater or oil boiler using a remote control, a dedicated signal line was extended from the equipment itself, and switches and indicator lamps were connected to the end of the signal line. The configuration of attaching a holder is the earliest and has been put into practical use in many cases.

However, this configuration has the disadvantage that as the amount of information increases, the number of signal lines increases, making wiring work complicated. In particular, in multi-remote control systems where multiple remote controllers are connected to remotely control one device from various locations at the same time, the conventional signal line extension method requires a large number of signal lines, so consumer devices This was virtually impossible at this level.

Therefore, as a remote control method for a system that handles a relatively large amount of information, we have developed a remote control system that uses two-wire digital signal transmission technology that serially transmits information that corresponds to digital bits. is possible.

However, in order to commercialize this two-wire digital signal transmission technology into a remote control system for household energy equipment such as gas water heaters and oil boilers, it is necessary to There are such conditions.

In other words, in the above-mentioned applications, since the equipment controlled by the remote control handles fuel such as gas or oil, if the control were to be lost, a very dangerous situation could occur. Therefore, as the so-called access method for signal transmission, it is preferable to adopt a polling method instead of a contention method. Furthermore,
It was necessary to use a signal transmission method that would shorten the polling cycle as much as possible, ensure close communication between the remote control and the device itself, and transmit information quickly and accurately.

Purpose of the invention The present invention provides two-wire digital signal transmission.
The purpose is to simplify the configuration of signal packets, increase the speed of information transmission, and provide a transmitter/receiver that can reliably transmit information without transmission errors. It is intended to be applied to remote control systems for household energy equipment such as oil boilers.

Structure of the Invention The present invention is a unit code used for two-wire digital signal transmission, which starts with a mark and ends with a spacer, and whose length is 1/4, 3/4, and 2/4 of the length of one unit code. Three types of unit codes are provided, each consisting of a logic "0" code, a logic "1" code, and other special codes.A group of information is expressed by a combination of the two logic codes, and the beginning of this information group is A transmitting device for configuring and transmitting a signal packet by providing the special code in the signal, detecting the rising edge of a mark of this transmitted signal, and a time period of approximately 3/8 code length calculated from the rising edge of the mark. The program logic of the microcomputer is used to realize code determination processing that sets the timing for reading the logic of the bit when the time elapses and when the time of approximately 5/8 code length has elapsed, and the above-mentioned 3/8 code length and 5/8 code length are realized. This device is equipped with a receiving device configured to obtain the elapsed time by counting the clocks of the microcomputer, and has the feature of being able to accurately capture the starting point of an information signal packet with a small bit configuration. .

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows three types of unit codes used for signal transmission according to the present invention, each of which is composed of four states, _T1 to _T4 . Figure a is T ₁
Only the state, that is, 1/4 of the whole, is a mark,
The following T ₂ to _{T 4} are made up of spaces and represent, for example, logic "0". In FIG. 1B, states T ₁ to T ₃ , which correspond to 3/4 of the total, are made up of marks, and only the T ₄ state is made up of spaces, and corresponds to, for example, logic “1”. Figure c marks the T ₁ and T ₂ states,
The T ₃ and T ₄ states are configured as spaces, and both the mark and space are 1/2 the length of the whole.
For example, it is used as a synchronization unit code to indicate the start of a signal packet.

As mentioned above, in all three types of unit codes, the T ₁ state consists of a mark and the T ₄ state consists of a space, so the change from space to mark at the transition from T ⁴ → T ₁ is used as a lock signal and T ₂ ,T ₃
Information expressed in states is sent and received in a synchronous manner. That is, after a predetermined time has elapsed from the mark's rising point D ₀ at T ₄ →T ₁ (D ₁ when the time of approximately 3/8 code length has elapsed and D ₂ when the time of approximately 5/8 code length has elapsed), the information By incorporating 3.
It identifies the unit code of the type.

FIG. 2 shows an example of a signal packet constructed using the three types of unit codes mentioned above. First, field 1, which is composed of one or more synchronization unit codes (SYN), represents the beginning of a signal packet. Next, the address field and then the data field are information groups composed of a combination of a logic "0" code and a logic "1" code. ) will never appear, so no matter how the bit patterns in the address field and data field are expressed, the starting point of the signal packet can be reliably captured and the correct information can be detected.

FIG. 3 shows an example of the circuit configuration, and shows a transmitting/receiving device that has a power source, such as by being connected to a product power source of 100 VAC, and supplies power to other transmitting/receiving devices.

Furthermore, the basic circuit configuration for transmitting and receiving the transmitting and receiving device on the side receiving power is the same except for the power supply circuit, so a description thereof will be omitted.

In FIG. 3, reference numeral 1 indicates the entire configuration of the transmitting/receiving device on the power supply side, which is connected to a commercial power source of AC100V via terminals 2a and 2b. 3 is a current circuit, which converts AC100V input into DC voltages such as +12V, +5V, etc. necessary for electronic circuit operation, and creates a power supply _VB to supply to the transmitting/receiving device on the power receiving side. It is something.

Terminals 4a and 4b are for connecting transmission lines 5a and 5b to supply power to other transmitting/receiving devices and for communicating information signals _. Both ends 6a, 6b
It is connected to the.

8 is a transmitting/receiving digital logic circuit, which plays a central role in exchanging information with other transmitting/receiving devices. The modulated information signal sent via the transmission lines 5a and 5b is detected by the signal superimposition and separation circuit 7, and then demodulated into a baseband signal by the demodulation circuit 10 and sent to the transmitting/receiving digital logic circuit 8. Taken in from the input port (IN). As mentioned above, the input timing is T ₄ → T ₁ in Figure 1.
The unit code information is captured at the timing of D1 _and D2 after a predetermined time has elapsed from the rising point _D0 of the clock signal, and the elapsed time from _D0 to _D1 or _D2 is _the clock signal. It is obtained by counting the clock pulses CP output from the oscillation circuit 9. Also, whether the captured unit code is a logic "0" code, a logic "1" code, or a synchronous unit code is processed by the built-in unit code decoding means, and is processed by the microcomputer. It is also easy to configure with program logic.
FIG. 4a shows an example of a schematic flowchart.

Conversely, when transmitting information to another transmitting/receiving device, the built-in unit code generation means creates a unit code with the configuration as shown in Figure 1 above, and then combines these to create a unit code as shown in Figure 2. It outputs signal packets from the output port (OUT). T ₁ in Figure 1
The time length of the ~ _T4 state is created by counting the clock pulses CP output from the clock oscillation circuit 9. Such a signal generation operation can also be easily configured using the program logic of a microcomputer. FIG. 4b shows an embodiment of the schematic flowchart.

The transmission signal output from the output port (OUT) is modulated by a carrier signal (CARRIER) in the modulation circuit 11, passes through the signal superimposition/separation circuit 7, and is output to the transmission lines 5a, 5b.

The carrier signal (CARRIER) is the clock pulse CP output from the clock oscillation circuit 9 mentioned above.
is produced through the buffer circuit 12.

13 is an input/output circuit composed of LEDs, keys, switches, relays, volumes, sensors, etc. The obtained input/output information is transmitted to and from other transmitting/receiving devices via the transmitting/receiving digital logic circuit 8. They communicate with each other.

As is clear from the above explanation, this example
It goes without saying that this also holds true even if the marks and spaces are completely reversed, and that the structure of the unit code is not limited to the embodiment.

Effects of the Invention As is clear from the above detailed explanation, the present invention uses a clocked unit code that starts with a mark and ends with a space as a unit code used for two-wire digital signal transmission, and also uses a clocked unit code that starts with a mark and ends with a space. At least three types of unit codes with different values are defined as special unit codes such as a logic "0" code, a logic "1" code, and a synchronization unit code for indicating the start of a signal packet, and these are combined to form a signal packet. The logical unit code used to express information and the synchronization unit code used to express the start of a signal packet are completely separate, so even if the receiving operation starts midway, the signal will not be processed. This eliminates the possibility of misjudgment of the start point of a packet and realizes a quick and accurate signal transmission system with a small bit configuration.

Furthermore, the present invention uses a microcomputer in the transmitting/receiving digital logic circuit, and the decoding of received data and the generation of transmitted data can be easily realized using the program logic of the microcomputer, so that an inexpensive and compact transmitting/receiving device can be produced. This is a highly practical invention. Furthermore, the configuration in which the mark length is defined as 1/4 of the 1-bit length as logic "0" and 3/4 as logic "1", and the distance between them as "2", makes it difficult to detect errors. Highly reliable transmission and reception is possible, and frame synchronization can also be reliably performed by using a code whose mark length is 2/4 of a 1-bit length.

[Brief explanation of drawings]

FIGS. 1a, b, and c are unit code configuration diagrams of a transmitting/receiving apparatus that is an embodiment of the present invention, FIG. 2 is an example of a signal packet similarly configured using unit codes, and FIG. Similarly, the circuit configuration diagram of the transmitting and receiving device,
4a and 4b are schematic flowcharts of an embodiment using the same microcomputer program logic. 1... Transmitting/receiving device, 5a, 5b... Transmission line, 7
... Signal superimposition and separation circuit, 8 ... Transmission/reception digital logic circuit, 9 ... Clock oscillation circuit, 10 ... Demodulation circuit, 11 ... Modulation circuit.

Claims (1)

[Claims] 1 There are three types of unit codes that start with a mark and end with a space, and the length of the mark is 1/4, 3/4, and 2/4 of one unit code. In addition to the "1" code and other special codes, an information group is expressed by a combination of the two logical codes, and the special code is placed at the beginning of this information group to configure a signal packet and transmit it. The device detects the rising edge of the mark of this transmitted signal, and calculates the logic of the bit when a time of approximately 3/8 code length and approximately 5/8 code length has elapsed from the rising edge of the mark. A configuration in which code determination processing with read timing is realized by the program logic of a microcomputer, and the elapsed time of the 3/8 code length and 5/8 code length is obtained by counting the clocks of the microcomputer. A transmitting/receiving device equipped with a receiving device.