JPS6120444A - Data transferring system by infrared rays - Google Patents

Abstract

PURPOSE:To improve the reliability of a data transfer by executing an error check of a received block, transferring a data block as it is to a transmitter by infrared rays if it is correct, comparing the transferred data block with a correct data block, transferring its correct data block to a receiver again by infrared rays if there is an error, and transferring a data part by restoring the infrared rays even if the infrared rays are cut off temporarily. CONSTITUTION:One data block of a transmitting signal is transferred from a transmitter 3. If the received data block is a definite format, a receiver 4 sets its data part 12 to a buffer of the inside, and transfers the data buffer just as it is to the transmitter 3. The transmitter 3 compares the data part 12 sent from the receiver 4 with the data part which is sent previously, and if they are equal to each other, it is discriminated that the transfer is executed correctly, and the next data block is transferred. If they are different from each other, the previous data block is transferred to the receiver 4 again.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a data transfer method using infrared rays.

[Description of conventional technology]

In the conventional infrared data transfer method, even if the infrared rays are cut off while transmitting data from the sender to the receiver, the sender continues to send data, and the receiver cannot receive data while the infrared rays are cut off. .

However, even if a data error occurs during transmission, it will be received as is, which has the disadvantage of low reliability.

[Purpose of the invention]

An object of the present invention is to provide an infrared data transfer method that eliminates these drawbacks and improves the reliability of data communication.

[Structure of the invention]

In the data transfer method using infrared rays of the present invention, a data block transmitted from a transmitter is received by a receiver, an error check is performed, and if the result is correct, the data block is transferred as it is to the transmitter by infrared rays, and the data block is sent to the transmitter. So,
This transferred data block is compared with the corresponding correct data block, and if there is an error, the correct data block is transferred again to the receiver via the infrared IK, and the two data blocks received by the receiver are If the blocks are different from each other and the result of the error check is correct, the preceding data block is received internally and the following data block is set in the buffer, and if the two data blocks received by the receiver are the same, the preceding data block is The data block is set in a buffer, and the data block is transferred to the transmitter by infrared rays.

〔Example〕

FIG. 1 shows the format of a transmission signal data block in an embodiment of the present invention, which is composed of a data section 12 inserted in a start bit 11 and a stop bit 13, and a flag 14 for error correction. The value of each bit in the data section 12 and flag 14 is 1 or 0 depending on its width.
distinguish between

FIG. 2 shows an embodiment of the present invention, where l is an infrared diode and 2 is an infrared receiving module. Transmitter 3 to 1st
One data block of the transmission signal in the format shown in the figure is transferred. If the received data block is in a fixed format, the receiver 4 sets the data section 12 in the internal buffer, transfers the data block as it is to the transfer transmitter 3, and if the received data If the block is not in a fixed format, it remains waiting to be received.

The transmitter 3 compares the data section 12 sent from the receiver 4 with the previously sent data section 12, and if they are equal, determines that the data was transferred correctly, and transfers the next data block. If the data block sent from the receiver 4 is not in a fixed format, or if the sent data block 12
If it is different from the previously sent data block 12, the prenatal data block is transferred to the receiver 4.

When the receiver 4 receives the data block, the data section 12 previously set in the buffer receives it as data (5 data), and sends the received data section 12 to the buffer.
This data block is transferred in its entirety to the transmitter 3K, and if the received data section 12 is the same as the previous data section 12, it is determined that an error has occurred in the transmitter 3, etc., and the data section received at this time is Previous data section 12 instead of 12
is set in the buffer and the entire data block is transferred to the transmitter 3.

As described above, the receiver 4 utilizes the lag 14 in which the previous data section 12 is internally received as an error-free data section 12 only when the data block is correctly transferred.

This is a flag that is inverted every time the data section 12 changes in the receiver. As a result, the receiving side can temporarily decide whether the received data section 12, the new data section 12, or the data section 12 that was sent again due to an error.

Using this transfer method, computers can communicate with each other using infrared rays. It can also be applied to wireless keyboards using infrared rays by adding a method in which the receiver is equipped with a timer and if no data is received within a certain period of time, the data set in the buffer is used as the received data.

〔Effect of the invention〕

As explained above, according to the present invention, even if infrared rays are temporarily cut off, it is possible to restore the infrared rays correctly and transfer the data part.
Since error data is not received by the receiver, the reliability of data transfer is improved.

[Brief explanation of drawings]

FIG. 1 is a timing diagram showing the format of a transmission signal in an embodiment of the invention, and FIG. 2 is a block diagram showing the embodiment of the invention. 1... Infrared diode, 2... Infrared receiving module, 3... Transmitter, 4...
...Receiver, 11...Start bit, 12.
...Data section, 13...Stop bit, 14...Flag for error correction. Agent Patent Attorney Uchihara Hi・ 〃 So〃 ρl θ/ρ10/ θθ ldo 14

Claims (1)

[Claims] The receiver receives the data block sent from the transmitter and checks for errors. If the result is correct, the data block is transferred to the transmitter using infrared rays. If there is an error when comparing the data block with the correct data block corresponding to the data block, the correct data block is transmitted to the receiver again by infrared rays, and if the two data blocks received by the receiver are different from each other and the result of the error check is If it is correct, the preceding data block is received internally and the succeeding data block is set in the buffer, and if the two data blocks received by the receiver are the same, the preceding data book is set in the buffer and the data block is A data transfer method using infrared rays, characterized in that the data is transferred to the transmitter using infrared rays.