KR20020025517A - A method of using common serial port for computer - Google Patents

Abstract

PURPOSE: A method for sharing a computer serial port is provided to share the serial port by using a server unit of each computer and judging the serial port is an idle state during a setting time of a timer. CONSTITUTION: A corresponding program requests the seizing and use of serial ports to a computer control unit for transmitting serial data(S100). The computer control unit judges whether serial ports are an idle state or the specific program is a seizing state(S110). If the serial ports are seized and used, the computer control unit counts a certain time set in a timer of a server unit(S120). The computer control unit judges whether the serial ports are the idle state or a seized state by the program(S130). If the serial ports are the idle state and the seized state by the specific program, the computer control unit admits that the corresponding program seizes the serial ports(S150). The program receives the admission of the seizing of the serial ports and transmits the serial data through the serial ports(S160).

Description

How to share computer serial port {A METHOD OF USING COMMON SERIAL PORT FOR COMPUTER}

The present invention relates to a serial port sharing method that allows a limited serial port of a computer to be suitable for sharing by multiple programs, and more particularly, to allow multiple programs that are clients to share a serial port server. .

A personal computer (PC) is a serial port. Two PCs are given as Com1 (Com3) and Com2 (Com4). In general, a single serial port is used to control a mouse and other controllers. You will be able to connect and communicate with other computers using one serial port.

When transmitting and receiving data between computers using the serial port as described above, since the serial port can transmit one data at a time, a plurality of programs executed in the computer simultaneously drive the one serial port. There was a problem that could not be done.

Hereinafter, a method of using a serial port of a computer according to the prior art will be described with reference to the accompanying drawings.

Attached to explain the prior art, FIG. 1 is a block diagram of a computer function of serial port sharing according to the prior art, and FIG. 2 is a flowchart of a computer serial port sharing according to the prior art.

Referring to FIG. 1, the first computer 20 of serial port sharing according to the prior art includes a plurality of programs 11, 12, and 13 each having a different purpose.

When the allocation request signal Open_Req of the programs 11, 12, and 13 is applied by a control unit not shown in detail in FIG. 1, the serial data transmission path of the serial data transmission path in the idle state is A serial port 25 for granting occupancy is included.

In addition, the same function and configuration as the first computer 20 includes a serial port 35 for transmitting and receiving serial data, so that a second computer 30 is provided, and the serial port 25 and the serial port 35 are included. Are interconnected and transmit their data.

Referring to the attached FIG. 2, the serial port sharing method according to the related art includes a specific program (11, 12, 13) that intends to use the corresponding serial port (25) in the first computer (20). A first step S10 of requesting the occupancy and use of the corresponding serial port 25 (Open_Req),

The control unit of the computer 20 that has received the request Open_Req determines whether the serial port 25 is currently occupied and in use or idle;

If the serial port 25 is occupied and in use in the step S20, the process proceeds to the end step. If the idle state is in the idle state, the corresponding programs 11, 12, and 13 stop the serial port 25. A third step (S30) of granting and setting up to occupy,

The corresponding program (11, 12, 13) occupies the serial port 25, the fourth step (S40) for transmitting and receiving data with the second computer 30 through the serial port 35,

The computer 20 determines whether the corresponding programs 11, 12, and 13 have completed data transmission and reception, and if the data transmission is not completed, returns to the fourth step S40, and completes The case consists of a fifth step (S50) proceeding to the end step.

Hereinafter, a computer serial port sharing method according to the related art having the above configuration will be described in detail with reference to the accompanying drawings.

The first computer 20 has a plurality of programs (11, 12, 13) for performing different purposes and functions, and the plurality of programs (11, 12, 13) are each connected to the serial port (25, 35) In order to transmit and receive data to and from the second computer 30, the serial port 25 of the first computer 20 must be occupied.

As an example, when the first program 11 intends to occupy the serial port 25 and uses it, if the occupancy request (Open_Req) is made (S10), in the controller of the first computer 20, the serial It is determined whether the port 25 is in the standby state (S20). If the state is not in the idle state (Idle) state, the process proceeds to the end step and terminates. The first program 11 that transmits a grant signal and receives the occupancy grant signal performs a corresponding port setting operation to use the serial port 25 (S30).

As described above, the first program 11 in which necessary settings are completed transmits data (S40), and the control unit determines whether data transmission is completed (S50), and if the data transmission is not completed, the fourth step. Feedback to (S40). If data transfer is completed, the process proceeds to end.

After the data transfer of the first program 11 is completed, the second or third programs 12 and 13 waiting for the next sequence start anew from the first step S10, and the serial port 25 is occupied. It determines whether or not it is idle or idle. Data can be transmitted only when it is waiting, and terminates again when occupied.

Therefore, until the specific programs 11, 12, 13 complete the transfer of data, the other programs 11, 12, 13 must terminate without transmitting the data. There was a problem that the operation efficiency is lowered.

In addition, since the programs 11, 12, and 13 cannot occupy the serial port 25 at the same time, there is a problem that the computer can quickly process data and the reliability is lowered.

The present invention adds a server unit capable of operating each program of a computer as a client, and allows a plurality of programs to share a single serial port by allowing a timer to operate when a specific program occupies the serial port. Its purpose is to provide what it can do.

In order to achieve the above object, the present invention provides a data transmission method using a serial port by a plurality of programs of a computer, the program requesting the computer control unit to occupy and use the serial port; The computer control unit comprises: a first determination step of determining whether the serial port is in a standby state or an occupied state; A timer step of counting a predetermined time set in a timer when the serial port is occupied and in use in the first determination step; A second determination step of determining, by a computer controller, whether the serial port is in a standby state or an occupied state; If the serial port is occupied in the second determination process, it is determined whether a predetermined time set in the timer has expired. If the timer is not terminated, the controller returns to the second determination process, and if the timer expires, the process ends. It is characterized by an ongoing out process.

1 is a block diagram of a computer function of serial port sharing according to the prior art,

2 is a computer serial port sharing flowchart according to the prior art,

3 is a functional block diagram of a computer according to the present invention,

4 is a flowchart of a method for sharing a computer serial port according to the present invention;

** Explanation of symbols on the main parts of the drawing **

11,12,13: Program 20,30,40,50: Computer

25,35: Serial port 45: Servo

Hereinafter, a method of sharing a computer serial port by the configuration of the present invention will be described with reference to the accompanying drawings.

3 is a functional block diagram of a computer according to the present invention, and FIG. 4 is a flowchart of a method for sharing a computer serial port according to the present invention.

Referring to FIG. 3, the computer according to the present invention includes a plurality of programs (11, 12, 13), each having a different purpose and function,

When a plurality of programs 11, 12, and 13 receive a signal Open_Req for requesting the occupation of the serial port 25 described below, the serial port 25 is granted by priority. A servo unit 45 having a timer function to count for a predetermined time and a function of continuously checking the occupation state of the serial port;

And a first computer 40 and a second computer 50 including serial ports 25 and 35 for outputting data applied from the servo unit as serial signals.

In addition, referring to the accompanying FIG. 4, in the case where a plurality of built-in programs 11, 12, 13 of the computer 40, 50 transmit serial data using the serial ports 25, 35,

A request process (S100) for the corresponding program (11, 12, 13) to request the occupancy and use of the serial ports (25, 35) to the computer control unit (S100) to transmit serial data;

The computer controller may determine whether the serial ports 25 and 35 are in an idle state or a seize state in which specific programs 11, 12, and 13 transmit serial data; ,

In the first determination process (S110), when the serial ports 25 and 35 are occupied and are in use, a timer that counts a predetermined time set in a timer of the server unit 45. Process (S120),

A second determination process of determining, by the computer control unit, whether the serial ports 25 and 35 are in an idle state not occupied by a program or in a seized state to transmit serial data by a program; (S130),

In the second determination process (S130), when the serial ports 25 and 35 are in a seize state, it is determined whether a predetermined time set in the timer of the server unit 45 is completed by counting. If the timer has not expired, the process returns to the second determination process S130, and if the timer expires, the process proceeds to an end process (S140).

In the first determination process S110 and the second determination process S130, the serial ports 25 and 35 are seized by specific programs 11, 12, and 13 and are not transmitting serial data. If the (Idle) state, the authorization process (S150) to allow the corresponding program (11, 12, 13) to seize the serial port (25, 35),

The programs 11, 12, and 13 that have been granted the serial port 25 and 35 seize to transmit the serial data are serial data through the serial ports 25 and 35. Transmission process for transmitting the (S160),

In the transmission process (S160), it is determined whether the transmission of the serial data is completed by the corresponding programs 11, 12, and 13, and if the transmission of the serial data is not completed, the transmission process ( The process returns to S160, and when the transmission of the serial data is completed, the process is completed.

Hereinafter, a method of sharing a serial port using a computer according to the present invention having the above configuration will be described in detail with reference to the accompanying drawings.

As an example, of the plurality of programs 11, 12, 13 of the first computer 40, specific programs 11, 12, 13 are connected to the second computer 50 using the serial port 25. If data is to be transmitted in serial, the servo unit 45 requests the seize of the serial port 25 (Open_Req) (S100), and the server unit 45 transmits the serial port ( It is determined whether 25 is occupied by other programs 11, 12, and 13 and is transmitting serial data or idle (S110).

If the serial port 25 is already occupied by other programs 11, 12, 13 in the first determination process S110 and is transmitting serial data, the server unit 45 may include a timer ( The timer is operated to count for a predetermined time (S120).

While the timer of the server unit 45 counts as described above, the server unit 45 continues to seize the serial port 25 by other programs 11, 12, and 13. Serial) it is determined whether the data is being transmitted or is not occupied by another program and is in an idle state (S130).

If the serial port 25 is already occupied by another program (11, 12, 13) and is in the state of transmitting serial data as determined in the second determination process (S130), the servo unit The timer (45) by 45 determines whether the time has elapsed (S140) by completing all the counts according to the set predetermined time (S140). By feeding back to the second determination process (S130), the occupation of the serial port 25 is canceled for a predetermined time set in the timer of the servo unit 45, and thus the standby state is idle. Permits to continuously check or judge the acknowledgment, and if the idle state within the set time of the timer to occupy the serial port 25, the serial port 25 continues for the predetermined time set If you keep the Seize state, the program (11 12 and 13 do not occupy the serial port and proceed to termination.

If the serial port 25 is not occupied by the specific programs 11, 12, and 13 in the first determination process S110 or the second determination process S130, and is in an idle state, The servo unit 45 occupies the serial port to the corresponding programs 11, 12, and 13 to transmit a grant signal for transmitting serial data, and the corresponding programs 11, 12, and 13 In order to transmit serial data through the serial port 25, a port setup operation is performed (S150).

When the setup operation for serial data transmission of the serial port 25 is completed by the corresponding programs 11, 12, 13 of the first computer 40 as described above, the corresponding programs 11, 12, 13 ) Transmits serial data to the serial port 35 of the second computer 50 through the setup serial port (S160).

The servo unit 45 determines whether the transmission of the serial data is completed by the corresponding programs 11, 12, and 13 (S170). If the transmission of the serial data is not completed, the transmission process is performed. Feed back to (S160), and if the serial data transfer is complete, the terminal is placed in the idle state by the serial port 25, and the next program (11, 12, 13) is the serial port 25 To occupy and use it.

Therefore, in the technique of the present invention as described above, when the serial port 25 is in the idle state while the plurality of programs 11, 12, 13 wait for the time of the timer by the servo unit 45, Allows serial port 25 to be occupied.

According to the present invention of the above configuration, by using the servo unit of each computer and determining whether the serial port is in a standby state during a set time by a timer, a plurality of programs can be shared without terminating the serial port. It works.

In addition, each program occupies the standby state without being terminated during the setting time of the arbitrarily adjustable timer, and occupies as soon as the serial port is switched to the standby state, thereby reducing the overall operating time of the program and improving the reliability of the computer. And industrial use effects.

Claims (2)

Many programs in a computer use a serial port for data transmission. Requesting a program requesting the computer control unit to occupy and use a serial port; The computer controller determines a first determination process of determining whether the serial port is in a standby state or an occupied state; A timer process of counting a predetermined time set in a timer when the serial port is occupied and in use in the first determination process; A second determination step of determining, by a computer controller, whether the serial port is in a standby state or an occupied state; If the serial port is occupied in the second determination process, it is determined whether a predetermined time set in the timer has expired. If the timer is not terminated, the controller returns to the second determination process, and if the timer expires, the process ends. A method of sharing a computer serial port, characterized by consisting of the ongoing out process. According to claim 1, An authorization process for allowing the program to occupy the serial port if the serial port is in the standby state in the first and second determination processes; The program that is allowed to occupy the serial port includes a transmission process for transmitting data through the serial port, It is determined that the transmission of the data is completed in the transmission process, and if the data transmission is not completed, return to the transmission process, and if the data transmission is completed, the computer comprising a complete determination process to terminate How to share a serial port.