KR19980068377A - Implementation method of information transmission protocol between host device and two-way receiving device - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs

An information transmission protocol implementation method for lossless transmission of information received from a lower device to a higher device such as a host computer.

I. The technical problem to be solved by the invention

An object of the present invention is to provide a method of implementing an information transmission protocol between a higher level device and a two-way receiving device capable of lossless information transmission.

All. Summary of Solution of the Invention

A two-way receiving device for transmitting information received from a lower device to a higher level device, comprising: transmitting the information received from the lower level device to the higher level device and retransmitting the received information according to a received information response. If there is no response to the reception, it is checked whether the response according to the carriage return transmission for a predetermined time period, and if there is no response according to the carriage return transmission to notify the host device that the information transmission failed over the communication line.

la. Important uses of the invention

It can be used for a device that performs bidirectional communication with a host computer.

Description

Implementation method of information transmission protocol between host device and two-way receiving device

The present invention relates to an information transmission protocol between an upper apparatus such as a host computer and a bidirectional receiving apparatus, and more particularly, to a method for implementing an information transmission protocol for losslessly transmitting information received from a lower apparatus to an upper apparatus such as a host computer.

1 illustrates an example of a connection of a bidirectional receiver for transmitting information received from a lower device to a host computer. In FIG. 1, the bidirectional receiver 20 connected between the host computer 10 and the terminal 30 may transmit a microcomputer to process information received from the terminal 30, and transmit the processed information to the host computer 10. It consists of a universal asynchronous transceiver (UART). The bidirectional receiver 20 transmits and receives information between the host computer 10 and the terminal 30 in both directions in accordance with the prescribed communication procedure. However, in the conventional host computer 10, there is no error checking function for the information received from the bidirectional receiver 20, and thus there is a problem that cannot be verified when information loss occurs in the information transmission process.

Accordingly, an object of the present invention is to provide a method for implementing an information transmission protocol between an upper device and a bidirectional receiving device capable of transmitting lossless information when transmitting information between an upper device and a lower device.

In the present invention for achieving the above object in the two-way receiving apparatus for transmitting the information received from the lower device to the upper device,

After transmitting the information received from the lower device to the upper device, retransmit the received information according to the received information response response, and if there is no response to receive the information, checks whether the response according to the carriage return transmission for a preset time. In case that there is no response according to the carriage return transmission, the higher level device is notified that the information transmission has failed over the communication line.

1 is a connection example of a bidirectional receiver for transmitting information received from a lower device to a host computer.

2 is a communication data format diagram according to an embodiment of the present invention.

3 is a communication data processing flowchart of the bidirectional receiver 20 according to an embodiment of the present invention.

Hereinafter, an operation according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description and drawings, many specific details are set forth in order to provide a thorough understanding of the present invention, such as information transmission times, CR transmission times, and specific processing flows. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. And detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

First, the bidirectional receiver 20 according to an embodiment of the present invention is connected between the host computer 10 and the terminal 30 as shown in FIG. 1, and the configuration thereof is information received from the terminal 30, which is a subordinate device. And a general purpose asynchronous transceiver (UART) capable of transmitting the processed information to the host computer 10. And the communication standard between the host computer 10 and the bidirectional receiver 20 according to an embodiment of the present invention is shown in Table 1.

TABLE 1

2 illustrates a communication data format according to an embodiment of the present invention. Referring to FIG. 2, communication data according to an embodiment of the present invention includes 1 byte of STX (Start Of Text) information indicating the start of an information frame, variable data information, and 2 bytes of information data. Sum Check (SC) information, and Carriage Return (CR) information indicating the end of the information frame.

3 is a flowchart illustrating communication data processing of the bidirectional receiver 20 according to an embodiment of the present invention. Hereinafter, the host computer 10 and the bidirectional receiver according to an embodiment of the present invention will be described with reference to FIGS. 2 and 3. A description will be given of the implementation process of the information transfer protocol between (20).

First, when there is information to be transmitted to the host computer 10, the microcomputer of the bidirectional receiver 20 transmits the information in the data format shown in FIG. 2 in step 40 of FIG. 3. Thereafter, the microcomputer determines whether Y is received from the host computer 10 in step 42. The Y indicates information reception completion information indicating that information reception is normally completed as one of the information reception response responses. In other words, if Y is received in step 42, the microcomputer proceeds to step 62 and returns to step 40 after completing transmission of the corresponding information. However, if Y is not received in step 42, the microcomputer proceeds to step 44 to check whether N is received from the host computer 10. N denotes information reception error information indicating an information reception error as one of the information reception response responses. In the following description, this will be defined as information reception error information. Therefore, if Y or N is not received in steps 42 and 44, the microcomputer proceeds to step 46 and returns the information received from the terminal 30 to the host computer 10. After resending, proceed to step 48. The microcomputer then checks whether Y is received from the host computer 10 in step 48. If Y is received, the microcomputer proceeds to step 62; otherwise, the microcomputer proceeds to step 50 to check whether N is received. If N is received from the host computer 10 in steps 44 and 50, respectively, the microcomputer proceeds to step 64 to check whether the number of information transmission times exceeds the set value (3). When the number of times of information transmission in step 64 is less than or equal to the set value (3), the process returns to step 40 again and repeats steps 40 to 50 described above, and proceeds to step 66 when the number of times of information transmission exceeds the set value (3). Thereafter, in step 66, the microcomputer notifies the host computer that the information transmission has failed to enable emergency processing of the information received from the terminal 30. On the other hand, if there is no reception of Y or N even after retransmission of information received from the terminal 30 (step 46), the microcomputer stops transmitting information in step 52 and transmits CR to the host computer 10 to receive Y information or N information. Wait That is, the microcomputer checks whether Y or N is received from the host computer 10 for three minutes through steps 54 to 58 after the CR transmission. If Y or N is not received as a result of the test, the microcomputer proceeds to step 60 to notify the host computer 10 that the information transmission has failed over the communication line, thereby enabling emergency processing of the received information. On the other hand, if Y or N is received in step 54 or 56 respectively, the microcomputer returns to step 40 and repeats the lossless information transmission protocol process between the host computer 10 and the bidirectional receiver 20.

As described above, in the present invention, if information received error information is received after transmitting the information received from the terminal 30 to the host computer 10, it is regarded as an abnormality in information processing and repeats the retransmission of the information up to a set value. Therefore, when the information receiving error information is received, the host computer is notified that the transmission of the information has failed, so that the received information can be urgently processed. On the other hand, if there is no response even after retransmitting the information received from the terminal 30 to the host computer 10, the CR is transmitted. If there is no response according to the CR transmission for a preset time, the host computer is notified that the information transmission has failed over a communication line. By enabling the emergency processing of the information received from the terminal it is possible to lossless transmission of information.

As described above, the present invention minimizes the failure of information transmission that may occur in transmitting information received from the lower devices (transmitter and terminal) to the upper device (host computer), so that emergency actions may be taken for the information that failed to be transmitted. By notifying the host computer, there is an advantage that the information received from the lower device can be transmitted to the higher device without loss.

Claims (4)

In the bidirectional receiver for transmitting information received from the lower device to the upper device, After transmitting the information received from the lower device to the upper device, retransmit the received information according to the received information response response, and if there is no response to receive the information, checks whether the response according to the carriage return transmission for a preset time. And notifying the upper device that the information transmission has failed due to a communication line error when there is no response according to the carriage return transmission. The method of claim 1, wherein the host device is a host computer. The method as claimed in claim 1, wherein when the information receiving response indicates information receiving error information, information received from the lower device is repeatedly transmitted to a preset value until information receiving completion information is received. Implementation method of information transmission protocol between receiving devices. The method of claim 3, further comprising: notifying the higher level device that the information transmission failed due to an information processing error if the information reception completion information is not received even if the information received from the lower device is repeatedly transmitted to a preset value. Method for implementing the information transmission protocol between the higher-level device and the two-way receiving device characterized in that.