JPS607305B2 - Terminal control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an online system that connects terminals to a central device.
The present invention relates to a system, and particularly to a system based on inquiry/answer processing, and relates to a control method when processing received data that is generated asynchronously with inquiries from a center.

In a system in which a central device and a number of terminal devices are connected via a terminal control device that controls data transfer of the terminal devices, the terminal device generates an inquiry message requesting data transfer to the central device by key-in, and A data transfer control procedure is adopted in which the message is stored in the register of the terminal control device, the terminal control device sends it to the central device, and the central device sends out the data in accordance with this message. Additionally, data may be unilaterally transferred from the central device to the terminal device regardless of the terminal device's inquiry.

(referred to as one-way transmission) In this case, a one-way transmission message is issued from the central device, and acceptance of the message is requested. When this is accepted, the data is transferred from the central device and output to the output function (printer, etc.) of the terminal device.

Such a message needs to be stored in the terminal control device as an intermediary for starting the transfer of information. Conventionally, in online systems where there is a request to receive a one-way message from the central device that occurs asynchronously with the inquiry message from the terminal device, registers inside the terminal control device are set up for sending and receiving messages for each terminal device. If the register in the terminal control unit is used for both transmission and reception, the inquiry message from the input/output device is sent from the central unit while it is in the transmission/reception register. When receiving a request for a one-sided transmission message, either destroys the inquiry contents, receives the one-sided transmission message, outputs it to the terminal device, and starts retransmission of the inquiry contents, or one-sided transmission message request is performed. When a message is received, the central device is informed that the sending/receiving register is in use, and the sending message request is rejected.

First, if each terminal device were to be able to set its own transmitting register and receiving register, a large number of registers would be required within the terminal control device, which would increase the memory capacity.
Also, when used for both sending and receiving, if the inquiry message is destroyed and the sent message is output to the terminal, the following steps are required to restart the inquiry message.
Operator intervention is required, and even if a method is used to notify the central device that the transmitting/receiving register is in use, the method of notifying the central device must not be defined in the transmission control procedure with the central device. However, if we were to define a new procedure, we would have to modify the central equipment.

An object of the present invention is to save one or more save registers without changing the transmission control procedure between the central device and the terminal devices, and without increasing the number of registers in the terminal control device for each number of terminals. By simply adding this, messages sent from the central device that occur asynchronously with inquiries from terminal devices can be automatically processed.

A feature of the present invention is that when a terminal control device holds an inquiry message from an input/output device in its sending/receiving register, when it receives a request to receive a unilaterally sent message from the central device, each input/output device Temporarily save the inquiry message in the save register shared by the device, receive the sent message in the sending/receiving register, output the message to the input/output device, and then send the inquiry message for sending/receiving. By recovering the register, the one-way transmission message is promptly output to the input/output device, and the inquiry message is automatically returned to the transmission request state.

Next, specific examples of the present invention will be explained in detail using the drawings.

FIG. 1 shows a terminal system connected to a central device 1 via a line 4. As shown in FIG. The terminal system is composed of a terminal control device 2 and a terminal device 3 connected thereto.One terminal control device has a plurality of channels 5, and supports a plurality of terminal devices corresponding to the channels. FIG. 2 explains the functional blocks of the terminal control device shown in FIG. 1, in which one save register 7 is used as a save area common to the transmitting/receiving register 6 for message processing of the input/output device and the central unit, and each transmitting/receiving register. It consists of a transmission and reception control circuit 8 that controls it, a control information section 9 in which information necessary at that time is set, and a transmission and reception circuit 10 that performs transmission and reception processing to the central unit.

FIG. 3 is a flowchart showing the operation of the transmission/reception control circuit 8.
It is. FIG. 4 is a time chart showing the operation of this terminal device.

The monitoring procedure for transmission with the central device includes a request from the central device to send an inquiry message from the terminal device to the central device (hereinafter referred to as "boring"), and a request from the central device to send a message to the input/output device from the central device. A request from the central device for output (hereinafter referred to as selection), a response to the terminal device when receiving bowling and informing that there is no closing message (hereinafter referred to as EOT),
A response informing that the terminal device is in a receiving permission state when receiving a selection (hereinafter referred to as ACK), and a response informing that the terminal device is in a reception refusing state when receiving a selection (hereinafter referred to as NAK) ), and the operation of the terminal device will be explained using this procedure.
First, I will talk about what happens when you are bowled. When the transmitting/receiving circuit 1 receives the boring, it notifies the transmitting/receiving control circuit 8 of the boring. The transmission/reception control circuit 8 checks the control information section 9, and if there is a request to send an inquiry closing message to the central unit 1 in the transmission/reception register 6 corresponding to the corresponding input/output device 3, the transmission/reception circuit 1 transmits the inquiry closing message. If there is no transmission request, the transmitter/receiver circuit 1 is activated to transmit EOT. Next, I will explain what happens when a selection is received. Upon receiving the selection, the transmitting/receiving circuit 10 notifies the transmitting/receiving control circuit 8 of the selection.

The transmission/reception control circuit 8 checks the control information section 9, and if the transmission/reception register 6 corresponding to the corresponding terminal device 3 is not empty, it checks whether the save register 7 is empty (not in use) and checks whether the save register 7 is empty (not in use). If not, the transmitter/receiver circuit 101
Activation is performed to send this NAK. If the save register 7 is empty, the contents of the transmit/receive register 6 are transferred to the save register 7, the transmit/receive register 6 is emptied, and then the transmit/receive circuit 10 is activated to transmit an ACK. Note that if the transmission/reception register 6 is empty when receiving the selection, the transmission/reception circuit 10 is activated to transmit an ACK. When the transmitting/receiving circuit 10 receives a transmission activation from the transmitting/receiving control circuit 8, it performs a corresponding transmitting operation and then enters a waiting state for receiving a bowling or selection. However, after transmitting an ACK, it is not ready to receive a message from the central device 1. , when a message is received from the central device 1 at the sending/receiving register, it notifies the sending/receiving control circuit 8 of the reception.

The transmission/reception control circuit 8 instructs the channel 5 to output the received message to the terminal device 3. When the channel 5 outputs the received message to the input/output device 3, the transmission/reception register 6 is made empty. At this time, if the inquiry message has been saved in the save register 7, the saved inquiry message is restored from the save register 7 to the transmission/reception register 6 and put into a transmission request state, and the save register 7 is vacated. As described above, when the inquiry message from the terminal device 3 is in the sending/receiving register 6, the sending message, which is sent from the central device 1 asynchronously, is quickly output to the terminal device 3 by providing the save register 7. In addition, the previously set inquiry closing message can be automatically recovered and returned to the transmission request state.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an online system consisting of a central device and terminal devices. FIG. 2 is a block diagram of the terminal control device. Third
The figure is an operation flowchart of the transmission/reception control circuit. FIG. 4 is a timing chart showing various operations. 1
: Central device, 2: Terminal control device, 3: Input/output device, 4:
line, 5: channel, 6: transmission/reception register, 7: save register, 8: transmission/reception control circuit, 9: control information section, 10:
Transmission/reception circuit. Sai' Figure Sai 2 Figure Sai 4 Figure Sai 3 Figure

Claims (1)

[Claims] 1 A central device and a plurality of terminal devices are connected via a terminal control device, information is transferred between the central device and the terminal devices, and the terminal device requests information transfer from the center. In a system in which an inquiry message is issued, and the central device issues a transmission message while requesting that information be transferred to the terminal device regardless of the inquiry message, the terminal control device is provided corresponding to each terminal device. and has a transmission/reception register for storing the inquiry message or the one-way transmission message, and at least one save register, and when the inquiry message or one-way transmission message is issued, it is stored in the transmission/reception register and transfer control is performed. When the inquiry message is stored in the sending/receiving register and there is a one-way sending message, the status of the save register is checked, and if it is not empty, a reception rejection response is sent to the central device. If so, the terminal moves the inquiry message to the save register, stores the one-way message in the send/receive register to transfer information, and then returns the contents of the save register to the send/receive register. control method.