JPH02205148A - Data transfer system - Google Patents

Abstract

PURPOSE:To inform information data from reception equipment to transmission equipment by making the transmission equipment recognize the information data by sending a control signal to the transmission equipment from the reception equipment when the information data to be informed to the transmission equipment is detected. CONSTITUTION:In the case of changing the display of the segment display unit 12 of a keyboard 11 by changing the status of a main body 10, status data decided in advance corresponding to the status of the main body 10 is transferred sequentially from the keyboard 11. The main body 10, when detecting the status data Dsi equivalent to the status of the main body 10, changes the control signal C2 from (H) to (L). Thereby, it is possible to make the keyboard 11 recognize the status data to be displayed on the segment display unit 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data transfer method when data is exchanged between two devices.

[Conventional technology]

Conventionally, there has been a data transfer method shown in FIG. 3 when data is transferred between two devices.

That is, as shown in FIG. 3(a), two data transfer devices 1 and 2 are connected by two unidirectional data transfer paths 3 and 4 to perform bidirectional data transfer. As shown in (b), two data transfer devices rI
Figure 3 (e
) As shown in FIG. 1, there are devices that perform unidirectional data transfer by connecting two data transfer devices 1 and 20 with one unidirectional data transfer path.

[Problem to be solved by the invention]

However, when the configuration shown in FIGS. 3(,) and (b) is adopted to perform bidirectional data transfer, when the amount of data to be transferred differs significantly depending on the data transfer direction, for example, from the data transfer device 1 to If data is constantly being transferred to data transfer device 2, but data is only rarely transferred in the opposite direction, the usage efficiency of hardware such as data transfer paths and data transfer device circuits is low. Therefore, there was a drawback that the degree of hardware redundancy was high.

[Means to solve the problem]

The data transfer method of the present invention sequentially transfers predetermined types of data from a transmitting device to a receiving device, and when the receiving device detects notification data to be notified to the transmitting device from among the transferred data, it controls the transmitting device. The entire signal is sent out to confirm that this notification data has been detected.

[Effect]

When the receiving device detects notification data that should be notified to the transmitting device, the receiving device sends this notification data to the transmitting device by sending all control signals to the transmitting device to make it recognize that it has detected this notification data. Can be notified.

[Meio side]

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of a workstation device according to an embodiment of the present invention, and FIG. 2 is a time chart of each signal in this workstation device.

In FIG. 1, a workstation main body (hereinafter referred to as main body) 10 and a keyboard 11 are connected by one unidirectional data transfer path 13 and two control lines 14 and 15.

The status (state) of the main unit 10 is displayed on the keyboard 11.
A segment display 12 is provided for displaying numerical digits. From the keyboard 11 to the main body 10,
Data D is sent out via the unidirectional data transfer path 13, and a control signal C1 is sent out via the control line 14. A control line 15 is connected from the main body 10 to the keyboard 11.
A control signal C2 is sent out via.

Next, the operation will be explained.

Normally, by pressing a key on the keyboard 11, key data DK1, DK2...DK is transferred from the keyboard 11 to the main body 10 via a unidirectional data transfer path 13.
n is being transferred. At this time, control signals C1 and C2 are in the rLJ state (see FIG. 2).

Next, a case will be described in which the display on the segment display 12 of the keyboard 11 is changed due to a change in the status of the main body 10. First, the main body 10 is the keyboard 1
1 to indicate a status data request, time T1
The control signal C2 is set to rHJ (FIG. 2(C)). When the keyboard 11 recognizes this status data request, it changes the control signal C1 to rHJ at time T2 to indicate execution of status data transmission (FIG. 2(b)). Next, the keyboard 11 uses status data Dsn (n-
"J, 2, 3...) are sequentially transferred to the main body 10 at predetermined time intervals (Fig. 42 (a)). The main body 10 receives the status of this main body 10 and the status data Dan that is sequentially transferred. At time T3 when the status data Dsl corresponding to the status is detected, the control signal C is
2 from "I" to "L" (FIG. 2 (C)).The keyboard 11 changes the status data Dsi to be displayed on the segment display 12 as the control signal C2 changes from rHJ to "L". , and displays this status data Dgi on the segment display 12. After that, the keyboard 11 sets the control signal C1 to "H" at time T4 in order to indicate to the main body 10 that the transfer operation of the status data Dsn has ended. to rLJ (Fig. 3)).

This causes the main body 10 and the keyboard 11 to return to normal operation.

As explained above, in this embodiment, predetermined status data Dsn corresponding to the status of the main body 10 are sequentially transferred from the keyboard 11 to the main body 10, and the main body 10 transfers status data Dsn corresponding to the status of the main body 10. is detected, the control signal C2 is changed to r-
By changing HJ to rLJ, the keyboard 11 can be made to recognize the status data Dsi to be displayed on the segment display 12.

〔Effect of the invention〕

As explained above, in the data transfer method of the present invention, a predetermined type of notification data to be notified from a receiving device to a transmitting device is transferred from the transmitting device to the receiving device, and the receiving device transfers the notification data to be notified to the transmitting device. When detected, the receiving device can notify the transmitting device of the notification data by transmitting a control signal to the transmitting device to make it recognize that the notification data has been detected. Therefore, there is an effect that data can be notified in the direction opposite to the direction of the unidirectional data transfer path without increasing the redundancy of the hardware.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a workstation device in an embodiment of the data transfer method of the present invention, FIG. 2 is a time chart of each signal in this workstation device, and FIG. 3 is a data transfer system in a conventional data transfer method. FIG. 10... Workstation main body (receiving device), 1
1... Keyboard (transmission device t), 13... Unidirectional data transfer path, C211... Control signal, D111
~Dsi exposure...fist status data (notification data).

Claims (1)

[Claims] In a data transfer method in which data is transferred from a transmitting device to a receiving device via a unidirectional data transfer path, a predetermined type of data is sequentially transferred from the transmitting device to the receiving device, and the receiving device 1. A data transfer method characterized in that, when notification data to be notified to a transmitting device is detected from among data that has been transmitted, a control signal is sent to the transmitting device to make the transmitting device recognize that the notification data has been detected.