JPH06121000A - Transmission and reception method - Google Patents

Abstract

PURPOSE:To prevent the malfunction due to external noise and to improve the reliability by detecting a data signal having the start and set signals of dissimilar codes before and after a set data length. CONSTITUTION:At the transmission and reception sides, the code of the start signal, the code of the set signal, data signal, and data length are set to correspond each other. When the signal sent from a transmitter is received, the presence or absence of the start and set signals constructing each one signal by a DTMF receiver 9 is detected by a start/set code comparison section 11 comparing the set start/set signals. Also, the data length of the data signal can be detected by a reception counter comparison section 13 comparing the data length with the set data length. When the detected value is normal, it is outputted as a normal signal through an output gate 15, and when it is abnormal, outputted as a reception error. Thus, the receiver side can easily confirm the normal and abnormal signals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission / reception method, and more particularly, to transmission of numerical values such as temperature, pressure, current, voltage, and sensor, motor, heavy equipment, crane, industrial machine, agricultural machine, etc. The present invention relates to a transmission / reception method suitable for operating a control signal, and with a simple configuration, a transmission / reception method capable of highly reliable transmission / reception without malfunction due to external noise or the like.

[0002]

2. Description of the Related Art In transmitting and receiving signals, it is necessary to prevent malfunction due to external noise or the like. Therefore, in order to prevent this malfunction, conventionally, a method of transmitting and receiving a parity check or a control code, providing a receiving function on the transmitting side, and providing a transmitting function on the receiving side has been conventionally adopted. This transmission / reception method is a method in which a signal once received is sent back from the reception side to the transmission side as a return signal to confirm whether or not the return signal is correct.

[0003]

However, in the case of the transmission / reception method described above, in addition to the prevention of malfunction such as external noise,
For example, a double or triple check method is used to ensure safety against noise of the same frequency as signals such as data signals and double wave, triple wave, etc., which complicates the device. To do. There is a problem called ".

By the way, for example, the wireless transmission / reception method requires reliability especially when used for accurate signal transmission / reception and dangerous applications, and therefore the apparatus is complicated. In addition, the current situation is that a simple device is easily disturbed by various disturbances and its use is limited.

The present invention has been made in response to the above-mentioned problems, and its purpose is to perform highly reliable transmission / reception without malfunction due to external noise or the like with a simple structure. It is to provide a transmitting and receiving method.

[0006]

The transmitting and receiving method of the present invention as a means for solving the above-mentioned problems is such that a data signal is transmitted from a transmitting side for each set data length and a start signal consisting of a different code before and after the start signal. And a set signal are transmitted, the signal is received by the receiving side, the presence or absence of the start signal and the set signal in the signal, and the data length of the data signal are detected, and the result of the detection , A start signal and a set signal, and when the data signal has a predetermined data length, it is output as a normal signal, and when there is no start signal or set signal, or when the data length in the data signal is different, It is configured to output as an abnormal signal.

[0007]

In the transmitting and receiving method of the present invention, the data signal is transmitted for each set data length by locating and transmitting the data signal having the start signal and the set signal of different codes before and after it. By setting the code of each signal according to the application, it works so that the reception side can easily confirm the normal / abnormal signal.

[0008]

Embodiments of the present invention will be described below with reference to the drawings and the drawings. 1 and 2 show an apparatus according to an embodiment of the present invention,
FIG. 1 is a block diagram on the transmitter side, and FIG. 2 is a block diagram on the receiver side.

The transmission / reception method of this embodiment can be embodied by using the transmitter and the receiver shown in FIGS. Therefore, first, this transmission / reception device will be described.

In the transmitter, as shown in FIG. 1, the signal input to the signal input section 1 is passed through the latch 2 to the BCD gate 3
Input to the output side of the BCD gate 3 so that its output signal can be DTMF converted.
The F conversion unit 4 is connected, and the output side of the DTMF conversion unit 4 is connected to the transmission unit 5. Also, BCD gate 3
A data length setting unit 6 is connected to the gate side of the transmission timing setting unit 6 via a transmission timing setting unit 6, and a start / set code setting unit 7 is connected to the transmission timing setting unit 6 to transmit a start signal and a set signal. It is connected to the DTMF conversion unit 4 according to the transmission timing of the transmission timing setting unit 6.

In the receiver, as shown in FIG. 2, the receiving unit 7 receives the received signal via the amplifier 8 and DT.
It is connected to the MF receiver 9, and the output side of the DTMF receiver 9 is connected to the data latch 10, the start / set code comparison unit 11, the data non-arrival check unit 12, and the reception count comparison unit 13, respectively. Then, the start / set code comparison unit 11 compares the input start / set code with the signal input from the DTMF receiver 9, and the comparison data is input to the numerical value detection unit (match / mismatch detection unit) 14. The data length in each one signal (data signal between the start signal and the set signal) can be detected by the comparison data compared by the reception count comparison unit 13. Further, if the data detected by the numerical value detection unit (match / mismatch detection unit) 14 is normal, BCD is output via the output gate 15, and conversely, if abnormal, it is abnormal via the reception error output unit 16. It is configured to output an error as a signal.

The transmission / reception method of this embodiment is shown in FIG.
Signals can be transmitted and received by using the transceiver of FIG. Here, it is a transmission / reception method when FM radio waves are used and DTMF signals are used. That is, the transmitter / receiver side is set in advance so that the start signal code, the set signal code, the data signal, and the data length can be handled, and the transmitter side is always in a transmitting state by turning on the power. The signal input to the signal input unit (usually keyboard input or BCD) 1 is transmitted to the BCD gate 3
Then, a plurality of signals are formed according to the set data length input via the transmission timing setting section 6.

Next, each of the signals (a plurality of individual signals
For each signal, the DTMF conversion unit 4 combines (combines) the start signal and the set signal, which are different signals before and after the DTMF conversion unit 4, and transmits them via the transmission unit 8. Here, the transmission of the start signal and the set signal is transmitted by the transmission timing setting section 6 according to the set data length, and the DTMF conversion section 4 converts both signals into a signal combined before and after each one signal. To be done.

On the other hand, in the receiver, when the signal transmitted from the transmitter is received, the DTMF receiver 9 checks in advance by the start / set code comparing section 11 whether or not there is a start signal and a set signal constituting one signal. It is detected by comparing with the set start signal and set signal, and the data length (number) of the data signal is detected by the reception counter comparison unit 1
In 3, the data length of the data signal of the above-mentioned each 1 signal (a pattern signal composed of the data signals located between the start signal and the set signal) detected by comparing with the preset data length Is detected and if it is a normal value, BCD is output as a normal signal via the output gate 15, and if it is an abnormal value, an error is output as a reception error.

Here, the DTMF signal can output 16 kinds of signals. When A to F are confirmation codes (start code, set code) and 0 to 9 are data, (1) start code ( A), 1 piece of data (0 to
9 numbers), set code (B), (2)
Start code (A), 2 pieces of data (combination of numbers from 00 to 99), set code (BC), (3) Start code (AB), 3 pieces of data (combination of numbers from 000 to 999), set code ( Set the confirmation code and data such as (CDE).

That is, the transmitting side is always in a transmitting state from the time of power-on, and the receiving side always receives and always judges the contents, and performs processing (output) according to the contents. Further, the confirmation code, the data, and the data length are set so that the transmitting side and the receiving side correspond to each other, and the data can be freely set from 1 to n by setting the number of digits. In addition,
If the start code and the set code are always set as different codes, the start and end of one signal can be determined, and one signal with high reliability can be obtained.

By the way, the data length means a fixed time and a fixed number within the time. In other words, 1 start code for a time, 3 data for 3
Xa time, 2xa time with 2 set codes,
The number is 6 (1 + 2 + 3), and the time is 6a (a + 2a
+ 3a). In this case, 6 pieces are transmitted from the transmitting side within the time 6a. Then, on the receiving side, it is judged to be correct when the set 6a and 6 pieces match (setting can be set only for data, setting only for code, and combination setting), and the time set in this way is set. By determining whether or not the number is correct, it is possible to perform highly reliable transmission and reception.

As described above, transmission / reception is performed with a specific pattern of a fixed start code, a fixed data length, and a fixed set code, and the receiving side is set so that reception corresponding to the transmitting side can be performed. However, if the specific pattern matches, it is determined to be correct, and a signal or the like according to each content is output. If the patterns do not match, it is determined that the pattern is not correct and a signal or the like according to the content is output.

Next, an example of the case where it is judged to be correct and the case where it is judged to be incorrect will be described.
Here, it is assumed that the start code is A, the data is 3, the interval is h, and the set code is F, and the transmission side transmits as follows. A123FA124FA125FA126F

When it is judged to be correct, it is detected as A123FA124FA125FA126F.

On the other hand, when it is judged that it is not correct, Is detected.

As described above, after the start code A,
When 3 digits of data, and then the set code F and the data length match, the data is taken in as correct data, and if they do not match, it is judged as NG. Then, the number of times the states 1 to 3 are set (for example, 1
If it occurs twice, twice ...), it is determined that a failure (NG) has occurred, and a device to which the receiver is connected can output a stop signal, a reset signal, or the like.

Further, since the signal is always transmitted continuously, if the signal is interrupted even at the receiving side, it is judged as abnormal, but if the received content becomes normal, it is regarded as correct data. It can be captured and can be transmitted and received with high reliability. In the case of the transmission / reception method of this embodiment, if the signal is interrupted when the environmental condition is not good, or if the signal is affected by an interfering radio wave, it is generally judged as NG and treated as correct data. There is no configuration.

In order to confirm the effect of this embodiment, the apparatus according to the method of this embodiment was incorporated in the operation of the crane, and the operation was used for one year. As a result, there was no malfunction, and no radio wave was received. Only when the crane stopped. This is because, in the initial setting, in the case of abnormality (NG), it was set to stop.

From these results, it was confirmed that the transmitting / receiving method of the present embodiment can eliminate malfunctions and accurately perform remote control of equipment in various fields. Incidentally, the present invention is not limited to the above-described embodiments, but includes configurations that can be modified and implemented within a range that does not change the gist of the present invention.

[0026]

As is apparent from the description of the abnormality, according to the transmitting / receiving method of the present invention, the data signal is provided with the start signal and the set signal of different codes before and after the set data length. Since the signal is placed and transmitted in advance, by setting the code of each signal in advance according to the application, the
This has an effect that an abnormal signal can be easily confirmed.

Therefore, according to the present invention, a transmission / reception method suitable for transferring numerical values such as temperature, pressure, current, voltage, and sensor, and operating control signals of motors, heavy equipment, cranes, industrial machines, agricultural machines, etc. Therefore, it is possible to provide a transmission / reception method capable of highly reliable transmission / reception without malfunction due to external noise or the like with a simple configuration.

[Brief description of drawings]

FIG. 1 is a block diagram of a transmitter for implementing the present invention.

FIG. 2 is a block diagram of a receiver for implementing the present invention.

[Explanation of symbols]

1 ... Signal input section, 2 ... Latch, 3 ... BCD
Gate, 4 ... DTMF conversion unit, 5 ... Transmission unit, 6 ... Data length setting unit, 17 ... Sending timing setting unit, 7 ... Start / set code setting unit,
8 ... Amplifier, 9 ... DTMF receiver, 10 ...
..Data latch, 11 ... Start / set code comparison unit, 12 ... Data non-arrival check unit, 13 ...
・ Reception count comparison unit, 14 ... Numerical value detection unit
Mismatch detection unit), 15 ... Output gate, 16 ... Reception error output unit

Claims (1)

[Claims] 1. A data signal is transmitted from a transmitting side for each set data length, and a signal in which a start signal and a set signal consisting of different codes are positioned before and after the set data length is transmitted, and the receiving side receives the signal, The presence or absence of a start signal and a set signal in the signal and the data length of the data signal are detected,
As a result of the detection, if the data signal has a start signal and a set signal and the data signal has a predetermined data length, it is output as a normal signal, and the start signal or the set signal is not present, or the data length in the data signal is If they are different, the transmitting / receiving method is characterized in that an abnormal signal is output.