JPH05225110A - Data transfer device - Google Patents

Abstract

PURPOSE:To connect a temporarily released data transfer path in a remote controller, installed at a distance through a serial interface, under control from the installation side of a channel device. CONSTITUTION:The channel device 20 has a command sending circuit 30 which generates and sends out a command signal for a request to set a connection effectiveness flag 49 and a command detecting circuit 31 which detects the response command of the remote controller 40, and the remote controller 40 has a command detecting circuit 31 which detects the command signal sent out of the command sending circuit 30 and a command sending circuit 50 which generates and sends out a response command for a status in response to the command detection.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transfer device for an information processing system, and more particularly to a central processing unit and a peripheral unit, which are composed of a channel device and a remote control device connected by a serial interface, and are installed far apart from each other. The present invention relates to a data transfer device that transfers data input / output with a device.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram of an example of this type of data transfer apparatus. The data transfer device includes a channel device 2 for inputting / outputting data to / from the central processing unit 1, a remote control device 4 for inputting / outputting data to / from a peripheral device 5 installed at a location distant from the central processing unit 1, and a channel device 2 And a remote control device 4, and is constituted by a serial interface 3 for converting data and control signals into serial data and transferring the serial data. The channel device 2 and the remote control device 4 serve as data transfer paths, respectively. Transmission data buffer, data transmission unit, parallel-serial conversion circuit for data to be sent to partner device, serial-parallel conversion circuit, reception data buffer, data reception unit for data sent from partner device, and data transfer control circuit for controlling these Have and.

Further, when the power supply instability detection circuit 6 detects a power supply instability state due to power-off of the channel device 2 or the like, the channel device 2 sends a lock signal (LCK) of this power supply instability notification to the remote control device. 4, the remote control device 4 has an LCK detection circuit 8 for detecting a signal transmitted from the LCK transmission circuit 7.
And a connection for controlling a logical connection of a data transfer path at a point A between the reception data buffer 11 and the data reception unit 12 and a point A ′ between the transmission data buffer 13 and the data transmission unit 14 of the remote control device 4. And a valid flag 9.

These circuits are provided to prevent the remote control device 4 from malfunctioning due to invalid data sent to the serial interface 3 after the channel device 2 is powered off. L
When the CK detection circuit 8 detects the power supply unstable signal of the channel device 2, the connection valid flag 9 is reset so that the data transfer path of the remote control device 4 sends / receives each data buffer and the data sending / receiving unit. It is logically disconnected at the intervals A and A '.

The conventional connection valid flag 9 is set to start at the same time when the remote control device 4 is powered on and started up.

[0006]

In the conventional data transfer device, the connection valid flag for controlling the logical connection of the data transfer path of the remote control device can be set only when the remote control device is powered on and then started up. Therefore, when the power supply instability notification signal is not sent from the channel device, but the LCK detection circuit malfunctions due to noise on the serial interface and the connection valid flag is reset and the data transfer path is disconnected, the connection is established. There is a drawback that the data transfer path cannot be connected unless the remote control device is temporarily stopped in order to set the valid flag, and then the power is turned on again to restart.

An object of the present invention is to solve the above-mentioned drawbacks and, when the data transfer path in the remote control device is disconnected, respond to the request from the channel device without restarting the power supply of the remote control device. It is an object of the present invention to provide a data transfer device that can reconnect a disconnected data transfer path.

[0008]

According to the data transfer apparatus of the present invention, a signal requesting connection of a data transfer path disconnected by a power supply instability notification signal of a channel device detected from the serial interface is sent via the serial interface. A channel device having a means for transmitting, a means for detecting a connection request signal transmitted to the serial interface, and a logic according to the connection request signal for detecting the data transfer path inside the device disconnected by the detection of the power supply instability notification signal. And a means for notifying the channel device that the connection request signal has been detected and the connection processing has been performed.

[0009]

When the connection request signal is sent from the channel device through the serial interface, the remote control device detects the connection request signal and logically connects the data transfer path in the remote control device. The data transfer path in the remote control device that is logically disconnected by the power supply instability notification signal of the channel device can be reconnected without restarting the remote control device.

[0010]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the data transfer apparatus of the present invention.

The data transfer apparatus of this embodiment comprises a channel device 20 and a remote control device 40 connected by an optical serial interface 3. In FIG. 1, the channel device 20 includes a transmission data buffer 2 corresponding to a transfer path of data transmitted to the remote control device 40.
1, data transmission unit 22, parallel-serial conversion circuit 23
And the power supply instability of the channel device 20 detected by the power supply instability detection circuit 6 and the serial / parallel conversion circuit 24, the reception data buffer 25, the data receiving unit 26 corresponding to the transfer path of the data received from the remote control device 40. An LCK sending circuit 27 that sends a signal (LCK) to notify, a command sending circuit 30 that sends control data COM1 and COM3 corresponding to a connection request signal of the data transfer path to the remote control device 40, and a remote control to COM1 and COM3. Response control data COM2, COM from the device 40
4 and a data transfer control circuit 28 for controlling the data transfer of the channel device 20 including the operation of each of these circuits.

The remote control device 40 includes a serial / parallel conversion circuit 44, a reception data buffer 45, a data receiving section 46, which corresponds to a transfer path of data received via the optical serial interface 3, and data to be transmitted to the optical serial interface 3. Transmission data buffer 41, data transmission unit 42, parallel-serial conversion circuit 43, and power supply instability notification signal LC of the channel device 20 corresponding to the transfer path of
The channel device 2 connected between the LCK detection circuit 47 for detecting K and the reception data buffer 45 to the disconnection point A
Command detection circuit 51 for detecting the COM1 and COM3 signals sent from 0 and the channel device 20 to COM2, C.
It is set when the command detection circuit 50 which sends out the OM4 signal and the remote control device 40 is started up and when the connection detection signal is detected by the command detection circuit 51.
The K detection circuit 47 includes a connection valid flag 49 which is reset when the power supply instability notification signal is detected, and a data transfer control circuit 48 which controls the data transfer of the remote control device 40 including the operations of these circuits. ..

Next, the operation of this embodiment will be described.
In the normal state when the connection valid flag 49 is set, the control command data from the channel device 20 is sent to the data transfer control circuit 48 via the data receiving unit 46. However, when the connection valid flag 49 is reset, the data receiving unit 46 is disconnected, and the remote control device 40 cannot receive the data of the normal control command. In such a case, the command transmission circuit 30 of the channel device 20 continuously transmits the control data COM1 of the first connection request to the remote control device 40. When the command detection circuit 51 detects the first control data COM1, the remote control device 40 uses the second control data COM2 as the first response signal to the control data COM1.
From the command transmission circuit 50 to the channel device 20
Send to. The channel device 20 uses the first control data C
When the reception of the second control data COM2 is detected during the transmission of OM1, the transmission of COM1 is stopped, and instead, the third control data COM3, which is the second request signal, is continuously transmitted from the command transmission circuit 30. To do. Remote control device 40
When the reception of the second request signal COM3 is detected while the control data COM2 which is the first response signal is being transmitted,
The connection valid flag 49 is set to connect the disconnecting portions A and A ′ of the data transfer path, and the sending of COM2 is stopped, and instead the fourth control data CO that is the second response signal CO is sent.
Send M4 continuously. The channel device 20 knows that the connection valid flag 49 is set by detecting the reception of the fourth control data COM4, and stops sending the connection request signal COM3. Remote control device 40
Stops sending the fourth control data COM4 when COM3 is no longer detected, and then performs normal data transfer between the central processing unit 1 and the peripheral device 5 together with the channel device 20.

When the connection request signal sent from the channel device 20 is set as one, the remote control device 40 which detects this signal immediately sets the connection valid flag 49, and after the logical connection of the transmission / reception data transfer path is performed, The object of the present invention can be achieved even if the status report is transmitted from the transmission data buffer 41. However, as in the present embodiment, the connection request signal and the response signal are respectively set to the two-step control data COM1, COM3 and COM2, COM4, and the serial interface 3 and the remote control device 40 are first set.
If the status of the data transfer path including the data transfer path is checked and then the connection valid flag 49 is set and then checked, malfunction due to noise or the like generated on the data transfer path can be prevented, and more reliable. The purpose is achieved.

Although the serial interface 3 is described as an optical serial interface using an optical fiber in the present embodiment, the serial interface 3 is not limited to this, and may be a metal conductor transmission line or a wireless serial transmission line. Can achieve the object of the present invention as well.

[0017]

As described above, in the data transfer apparatus of the present invention, the channel device is provided with the signal sending request for the connection of the data transfer path in the remote control device, and the remote control device receives this connection request signal. By providing a means for detecting and a means for logically connecting the data transfer path according to the detected connection request signal, the data transfer in the remote control device which is detected by the power supply instability notification signal of the channel device and is disconnected Since the path can be logically connected by sending a connection request signal, the logical connection of the data transfer path can be restored from the channel device without stopping the power supply of the remote control device and restarting it. ..

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a data transfer device of the present invention.

FIG. 2 is a block diagram of a conventional example.

[Explanation of symbols]

 1 Central Processing Unit 2, 20 Channel Device 3 Serial Interface 4, 40 Remote Control Device 5 Peripheral Device 6 Power Supply Instability Detection Circuit 7, 27 LCK Sending Circuit 8, 47 LCK Detection Circuit 9, 49 Connection Valid Flags 11, 25, 45 Received data buffer 12, 26, 46 Data receiver 13, 21, 41 Transmitted data buffer 14, 22, 42 Data transmitter 23, 24, 43, 44 Parallel / serial conversion circuit 28, 48 Data transfer control circuit 30, 50 Command transmission Circuit 31, 51 Command detection circuit

Claims (1)

[Claims] 1. A channel device provided in the vicinity of a central processing unit, and an input power source independent of the channel device, provided in the vicinity of a peripheral device installed far away from the central processing unit, and A remote control device connected to the channel device via a serial interface, controlling transfer of input / output data between the central processing unit and the peripheral device, and the remote control device is configured to control the transfer of the channel device. In a data transfer device that logically disconnects a data transfer circuit between the central processing unit and the peripheral device inside itself when an unstable power supply is detected, the channel device is logically disconnected. A means for transmitting a signal requesting connection of a data transfer path to the remote control device via the serial interface is provided. However, the remote control device detects the connection request signal and a data transfer path in the device disconnected by detecting the power supply instability notification signal according to the detected connection request signal. And a means for notifying the channel device of the connection request signal detected and the connection processing state of the data transfer path.