JPH05100975A - Program loading system - Google Patents

Abstract

PURPOSE:To prevent program loading operation from becoming impossible due to the deviation of timing to start, by setting several secondary stations having the programs of the same initial station and starting program-loading from both initial and secondary stations. CONSTITUTION:The initial station 1 requires program transfer to all the secondary stations. Then, at the time of receiving the indication of starting program loading operation, the program transfer is required to the secondary station which outputs the indication of starting the program loading operation first. The secondary stations 4 and 3 wait for information of the end of program loading from the initial station 1. At the time of being required to transfer the program from the initial station 1, the secondary station 2 transfers the program to the initial station 1 and at the time of no requirement from the initial station 1, it output the indication of starting program loading operation to the initial station 1 and waits for the requirement to be transferred from the initial station 1 to transfer it to the initial station 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a program loading system, and more particularly to a program loading system between a primary station and a secondary station in data communication for providing an open system connection service.

[0002]

2. Description of the Related Art A conventional program loading system of this kind has been realized on a one-to-one communication line in the case of one secondary station, or from a primary station to a secondary station or from a secondary station to a primary station. The program was being loaded by starting in either direction.

[0003]

In the above-mentioned conventional program loading method, since the secondary station having the program of the primary station is realized on the one-to-one communication line, the secondary station is realized. If one fails, the program cannot be transferred and the primary station also becomes inoperable.

Further, since the program loading is performed by activating from one direction from the primary station to the secondary station or from the secondary station to the primary station, the timing of activation at the activating station is deviated. And there was a problem that the program could not be loaded.

[0005]

SUMMARY OF THE INVENTION The system of the present invention provides an open type inter-system connection service to one primary station which requires a program to be loaded from the secondary station at the time of power-on or initialization. In the program loading method in the communication line connecting one or more secondary stations having the program of 0 and one or more secondary stations not having the program of the primary station, at the time of turning on the power source or At the time of initial setting, the primary station issues a program transfer request to the secondary station, and all secondary stations that have the program of the primary station issue a program loading operation start instruction to the primary station. If the secondary station that received the program transfer request from the computer has the program and can transfer the program, the program is transferred. If the program loading request has not been started when the commanding operation start instruction is received, a program transfer request is issued to the secondary station that first sent the program loading operation start instruction, and then the program transfer request is received from the primary station. The secondary station transfers the program to the primary station, and after the program loading is completed, the primary station issues a program loading completion report to all secondary stations recognized by the primary station, and communicates message data with each secondary station. It is characterized by having means for starting.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an apparatus in which the present invention is implemented.

In the figure, a primary station 1 is a loaded station that needs to issue a program transfer request to the secondary station during the initialization operation and load the program from the secondary station. Secondary station 2 and secondary station 3 have the same primary station program. After the data link is established with the primary station 1, the secondary station 2
The secondary station 3 is a station that issues a program loading operation start instruction to the primary station 1 and transfers the program of the primary station 1. The secondary station 3 is a primary station in response to a program transfer request from the primary station 1 after a data link is established with the primary station 1. It is a station that cannot transfer the 1st program. The secondary station 4 is a station that does not have the program of the primary station 1.

Next, the operation will be described.

When the data link is established, the primary station 1 confirms that it has not received a program loading operation start instruction from the recognized secondary stations, and issues a program transfer request to all the recognized secondary stations. If the program loading operation start instruction is received, the program transfer request is issued only to the secondary station that first issued the program loading operation start instruction.

Even if the secondary station 4 receives a program transfer request, since there is no program to be transferred, no response is returned and the secondary station 4 waits for a program loading completion report from the primary station 1.

The secondary station 3 has a program to be transferred, but since it is in a transfer-disabled state, no response is returned and the secondary station 3 waits for a program loading completion report from the primary station 1.

The secondary station 2 sends a program transfer request to the primary station 1.
When it receives more, the program is transferred to the primary station 1. Also,
After the secondary station 2 establishes a data link with the primary station 1, the secondary station 1
If there is no program transfer request from, send a program loading operation start instruction to the primary station 1 without waiting for it.
Wait for the program transfer request to be transferred from the primary station 1 and transfer the program to the primary station 1.

The primary station 1 issues a program loading completion report to all the secondary stations 2 to 4 that it recognizes that the program from the secondary station 2 is loaded, and starts message communication with each secondary station.

[0015]

As described above, according to the present invention, on a communication line for providing an open system interconnection service,
By placing several secondary stations that have the same primary station program and activating the program loading from both the primary station and each secondary station, the program between the primary station and each secondary station There is an effect that it is possible to prevent the program loading operation from being disabled due to the timing difference when the loading is activated.

[Brief description of drawings]

1 is a block diagram of an apparatus in which the present invention is implemented.

[Explanation of symbols]

 1 Primary station 2 Secondary station 3 Secondary station 4 Secondary station

Claims (1)

[Claims] 1. One or more primary stations that have an open system connection service and require a program to be loaded from the secondary station when the power is turned on or when initialization is performed. In the program loading method in the communication line connecting the secondary station and 0 or more secondary stations that do not have the program of the primary station, the primary station recognizes when the power is turned on or at the initial setting. The secondary station that has the program of the primary station, all secondary stations that have the program of the primary station issue a program loading operation start instruction to the primary station, and the secondary station that receives the program transfer request from the primary station If the station has a program and can transfer the program, transfer the program, or when one station receives a program loading operation start instruction. If program loading has not started yet, a program transfer request is issued to the secondary station that first sent the program loading operation start instruction, and then the secondary station that received the program transfer request from the primary station sends the program to the primary station. The program loading method in which the primary station issues a program loading completion report to all secondary stations that the primary station recognizes after the program loading is completed, and starts communication of message data with each secondary station. .