JPH0730523A - Data communication method - Google Patents

Abstract

PURPOSE:To surely receive data even when bit out of synchronism takes place in a receiver. CONSTITUTION:A transmitter 1 divides frame data into plural blocks B1-B4 in the data communication method and rearranges sequentially the divided data based on a predetermined rule and sends them continuously for plural number of times. Then a receiver 2 stores the predetermined rule in advance and rearranges the blocks B1-B4 depending on the content of the rule when all the blocks B1-B4 are received to restore the data to a state of the original frame data. Furthermore, the reception processing of a block not requiring reception processing such as a block whose reception processing is already finished in a preceding frame is not made but the reception processing is halted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication method for transmitting / receiving serial data.

[0002]

2. Description of the Related Art Conventionally, when transmitting data between a transmitter and a receiver, particularly when performing one-way communication between a transmitter having no receiving function and a receiver having no transmitting function. In order to improve communication reliability while ensuring device miniaturization and cost reduction, when transmitting data from the transmitter side, a continuous transmission method is used in which the same data is transmitted multiple times in frame units. Even if the first frame cannot be received, the reception rate is attempted to be improved by trying to receive the second and subsequent frames.

[0003]

However, in such a continuous transmission system, when the receiver receives the transmission data by the bit synchronization system, a clock error or noise between the transmitter and the receiver, a noise in the receiver, and the like. Due to jitter etc. generated during demodulation of the received signal, bit synchronization deviation may occur after a specific bit, and even if frame data is continuously transmitted, data after a specific bit cannot be received for all frames. As a result, there is a problem that the reception rate of data decreases.

The present invention has been made in view of the above points, and an object of the present invention is to provide a data communication method capable of surely receiving data even if a bit synchronization shift occurs in a receiver. To provide.

[0005]

SUMMARY OF THE INVENTION The present invention is a data communication method for transmitting serial data between a transmitter and a receiver and performing continuous transmission for transmitting the same data a plurality of times in frame units. Then, in the transmitter, the frame is divided into a plurality of blocks, and each divided block is sequentially rearranged according to a predetermined rule and transmitted,
In the receiver, the rule is stored in advance, the data reception process is performed according to the rule, and when the reception process of all blocks is completed, the blocks are rearranged in the original array according to the rule. It is characterized by.

Further, in the data communication method, further, in receiving each of the frames in the receiver, a block unnecessary for the receiving process is not received, and the receiving process is suspended. is there.

[0007]

In the data communication method of the present invention, the transmitter divides the frame data into a plurality of blocks, sequentially rearranges the divided data according to a predetermined rule, and then continuously transmits and receives the plurality of times. In the machine, the predetermined rule is stored in advance, and when all the blocks can be received, the blocks are rearranged according to the content of the rule, and the original frame data state is restored. is there.

Further, in the reception of each of the frames in the receiver, the reception processing of a block which is unnecessary for the reception processing, such as a block for which the reception processing has been completed in the previous frame, is not performed, and the reception processing is suspended. Is there.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows a transmitter 1 and a receiver 2 according to the present invention.
FIG. 3 is a block diagram showing an example of wireless communication, showing an example in which one-way communication is wirelessly performed between the transmitter 1 and the receiver 2. The transmitter 1 includes a control circuit 11 that controls generation of digital data to be transmitted and an input / output device (not shown) such as a switch.
And a transmission circuit 12 that modulates the transmission data generated by the control circuit 11, and a transmission antenna 13 that transmits the modulated signal. The receiver 2 includes a reception antenna 21 that receives a transmission signal and a reception circuit 2 that demodulates the reception signal received by the reception antenna 21 and generates digital data.
2 and a control circuit 2 for decoding the digital data
3 and 3.

Here, in the control circuit 11 of the transmitter 1, as shown in FIG.
Each block B after being divided into one block B1 to B4
A block code, which is data indicating a block number, is added to 1 to B4. Next, each divided block B1
~ B4 are sequentially rearranged according to a predetermined rule to perform continuous transmission. For example, as shown in FIG. 1B, blocks are sequentially rearranged from the first frame to the fourth frame, and continuous transmission is performed four times. In other words, for the first data transmission, B
The transmission data is configured in the order of 1, B2, B3, B4 (first frame), and the second transmission data is B2, B.
The transmission data is configured in the order of 3, B4, and B1 (second frame), and B3, B4, and B are used for the third data transmission.
Configure the transmission data in the order of 1 and B2 (third frame),
The fourth transmission data is B4, B1, B2, B3.
The transmission data is constructed in the order of (4th frame) and is transmitted.

In the receiver 2, the predetermined rule of the transmitter 1, that is, the rule that the transmission data is transmitted from the transmitter 1 in a pattern as shown in FIG. 1B, is stored in advance. The receiving process is performed according to the content of this rule. For example, as shown in FIG. 3, when the first frame is received, the block B3 and the block B4 are deviated due to the bit synchronization shift.
If it is not received, the receiver 2 can discriminate the blocks B3 and B4 that could not be received from the code of the blocks that could be received. Try. In this embodiment, when the reception of the transmission data of the fourth frame is completed, the reception of all blocks is completed.

Further, the closer to the beginning of the frame, the lower the probability of bit synchronization deviation occurring. Now, in receiving the transmission data of the first frame, the first half block of the frame can be received, but the latter half block cannot be received. Therefore, the receiver 2 can determine that the next reception target is the transmission data of the third frame. Therefore,
As shown in FIG. 4, the receiver 2 does not receive the transmission data of the second frame and can suspend the reception process, during which the input / output device connected to the receiver 2 is controlled. There is a margin of. Then, the receiver 2 restarts the reception process that was paused at the same time as the transmission of the transmission data of the third frame from the transmitter 1, and when the blocks B3 and B4 are received, the reception processes of all the blocks are completed. Since it is completed, the subsequent blocks B1 and B2 can suspend the reception process. Furthermore, the reception processing of the fourth frame can be paused. if,
If the block B4 cannot be received during the reception of the third frame, the fourth frame may be processed for reception.

The receiver 2, which has received all the blocks B1 to B4, can obtain correct data by rearranging the blocks in the order of the block code.

According to the present embodiment, the receiver 2 has a pause period for the receiving process, so that the load on the control circuit 23 is reduced, and the process other than the receiving process can be performed with a margin.

In this embodiment, the transmission data is divided into four blocks B1 to B4, but the number of divisions is not limited to this. Also, regarding the rearrangement of the blocks B1 to B4, in the present embodiment, the rotation is performed in the left direction, but if the rules are stored in the receiver 2, the rotation in the right direction or another rearrangement may be performed. Needless to say.

[0017]

As described above, according to the data communication method of the present invention, in the transmitter, the frame data is divided into a plurality of blocks, the divided data are sequentially rearranged according to a predetermined rule, and then the plurality of blocks are arranged. The predetermined rule is stored in advance in the receiver, and when all the blocks can be received, the blocks are rearranged according to the content of the rule to return to the original frame data state. Since it is returned, it is possible to provide a data communication method capable of surely receiving data even if a bit synchronization shift occurs in the receiver.

Further, in the reception of each frame by the receiver, the reception process of the unnecessary block such as the block for which the reception process has been completed in the previous frame is not performed, and the reception process may be suspended. In this case, the processing other than the reception processing can be performed with a margin.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a data frame according to the present invention.

FIG. 2 is a block diagram showing a transmitter and a receiver according to the present invention.

FIG. 3 is a schematic diagram of a data frame showing the operation of the embodiment of the present invention.

FIG. 4 is a schematic diagram of a data frame showing the operation of another embodiment of the above.

[Explanation of symbols]

 1 transmitter 2 receiver 11 control circuit 12 transmission circuit 13 transmission antenna 21 reception antenna 22 reception circuit 23 control circuit B1 block that forms frame data B2 block that forms frame data block B3 that forms frame data block B4 that forms frame data Block

Claims (2)

[Claims] 1. A data communication method for transmitting serial data between a transmitter and a receiver and performing continuous transmission of transmitting the same data a plurality of times in frame units. Is divided into a plurality of blocks, and the divided blocks are sequentially rearranged according to a predetermined rule and transmitted, and the receiver stores the rules in advance, performs data reception processing according to the rules, and A data communication method, wherein each block is rearranged into an original array according to the above rule when the block receiving process is completed. 2. The data communication method according to claim 1, wherein in receiving each of the frames in the receiver, a block which is unnecessary for receiving processing is not received and the receiving processing is suspended.