JPS58158728A - Method for use in common of input and output device of data processor - Google Patents

Abstract

PURPOSE:To use an input/output device in common and to attain efficient operation, by performing data communication for plural terminal devices through the wiring of a power supply. CONSTITUTION:Personal computers 1-1, 1-2-1-n as terminal devices are coupled with a common I/O device 3 at a network by using a power supply line 2 as a communication line. Power supply superimposing communication devices 4-1, 4-2-4-n connect personal computers 1-1-1-n to the wirings 2. In the devices 4-1-4-n, the power supply cord of the personal computers 1-1-1-n and the communication lines are inputted to execute the superimposing communication on the wiring 2. The personal computers 1-1-1-n accesses each I/O of the device 3 by using the wirings 2 as the communication network as required.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that a large number of terminal devices such as burner computers/computers (personal computers) are arranged, and these terminal devices share and use input/output 1 (Ilo) devices such as magnetic disk devices and magnetic tape devices. The present invention relates to a method for sharing input/output devices of a data processing device.

Traditionally, magnetic disk drives, magnetic tape drives, and other I/O devices are used to process data using personal computers, but terminal devices such as personal computers are now used on many floors of offices and business establishments. When a large number of I/O devices are installed, it is uneconomical to provide an I/O device for each terminal device because it requires a large number of 10 devices and also requires various interfaces by installing the I/O devices. Therefore, it is desirable to share expensive I10 equipment. However, it requires terminal equipment and wiring work to be installed on each floor, and once installed, it is difficult to move. The problem also arises that it is not favorable from above.

The purpose of this invention is to solve the above-mentioned problems, and to create an i/n that is not inconvenient in terms of aesthetics and disaster prevention.

I of data processing equipment that can share the equipment and ensure low cost
/o To provide a device sharing method.

In order to achieve the above object, the I10 device sharing method of the data processing device of the present invention connects each terminal device and the shared I10 device via a power supply wiring, and performs data communication through this power supply wiring. The present invention will be explained in detail with reference to embodiments shown in the drawings.

FIG. 1 is a block diagram showing the configuration of a data processing system in which the present invention is implemented. In the same figure, there are 0 computers 1-1, 1-2, ---, 1-1, and 1 as terminal devices.
-n is a network in which the power supply wiring 2 is a communication line, and is coupled to the shared i10 device 6. 4-1・4-2-・
A-n is a power superimposition communication device for connecting each personal computer 1-1, 1-2, . . . 1-n to the power supply wiring 2.

This power superimposed communication device 4-1, 4-2...4-? L
The superimposed communication is sent to the power supply wiring 2. At the same time, the PC 1-1 is connected.
・1-2・-・-・1-n power cord and communication line are input connected.

The personal computers 1-1, 1-2, .

Devices (described below) can be accessed as needed. Furthermore, each computer 1-1, 1-2, -, -, 1-n can be moved and installed freely within the range where the power wiring network is installed, and its power cord can be plugged into the nearest power outlet. This completes the power connection and communication line connection.

The shared I/O device 5 is connected to the boss via the dedicated line 5)
9. It is bound to pu6. Computer 1-1/1-2--
--1- Controls data transfer between n and host CPU6. Communication between the shared 1/o device 6 and the personal computers 1-1, 1-2, . . . -1-n is carried out online, but
Only error-free data is transferred between the 10 devices 6. In this way, PC 1-1, 1-2, -
・・i −n (!: * ) Shared I between 6 CPUs
/Tsubapancon 1-1・1 with o device 6 interposed
-2・-・・-・1-n or ll host) When accessing cpu6, the access time becomes long due to the poor communication quality of the power supply wiring network, which prevents burden on boss) cpu6. It's for a reason. In other words, when the power supply wiring network is viewed as a communication line, the communication quality is much worse than that of a dedicated line, so power supply superimposed communication requires error recovery time due to data errors, but this example device eliminates this process. -Recovery time for PC 1-1, 1-2, --...1-n
and the shared I10 device 5 to prevent the host CPU 6 from being monopolized for a long time.

The shared 110 device 6 has a communication interface 7, a power superimposed communication interface 8. Various I/O devices 9-1/9-
9k and an I/O management processor 10.

The communication interface 7 performs data communication between the host CPU 6 and the management processor 10, and the power supply superimposition communication interface 8 communicates with the personal computers 1-1 and 1-2.
. . . Provided at the T-column for data communication between the i-n and the I10 management processor 10. The power source superimposing communication interface 8 includes high frequency modulation/demodulation means for superimposing the data to be communicated onto the power source wiring 2 .

The 110 devices 9-1, 9-2, . . . 9 are each device such as a magnetic disk storage, a magnetic tape device, and a printer.

I10 management processor 10 is the communication interface 7
, the turtle source superimposition interface 8 and each device 9-1, 9
It is a processor that manages -2, -, -, and 9-, and is equipped with built-in memory.

A memory map of the built-in memory 0 of the I/O management processor 1o is shown in FIG. Built-in memory M is shown in Figure 2 (
5), it has a program area mp and data areas m1-m2-mn.

The program area mp is an area assigned as a transfer area between the operating system and the CPU (host), and its detailed layout is as shown in FIG. 2(B). In other words, the program area mp is an operating system area that performs overall management including one interrupt processing, and the common area mp is for individual control of each shared I10 device.
I/O driver area, host c to store requests to shared I10 devices or terminal devices from host cpu6
pu request flag area, each terminal device
o A terminal that stores requests to the device or host CPU (1st year high school student)
-in) A request flag area and each I/O device 1f include a transfer area with the host CPU containing the type code of the terminal.

Data area m1, m2...mn is pan controller 1-1
・1-2...1n are provided and shared for sending to a personal computer or receiving from a pan computer. Each data area is a data type court area (m 1
, a) and a data area (m1b). The data type code is used to distinguish which I/O device the data to be transmitted or received corresponds to.

A more detailed layout of this data area is shown in Figure 2 (
It will be as shown in C).

Next, the operation of the embodiment system configured as described above will be explained with reference to the control flows shown in FIGS. 6 and 4.

FIG. 5 shows a transmission control flow in the shared I/O device 6. After the shared i10 device 6 starts operating, it is first determined whether there is an interrupt from the host CPU 6 [Step 8
T (hereinafter simply abbreviated as ST) 61] As a result of the judgment, an interrupt request is received from the host CPU 6 and the host) CPU 6
(ST32), but if no interrupt request is received, the process moves to the next step
It is determined whether the communication line is free (8T33).

If the communication line is not available, this step waits until the communication line becomes available.

When the communication line by the power supply wiring 2 becomes free, the power supply communication line is switched to transmission, and the data type code of the built-in memory M is transmitted (ST34). Then, an ACK (, *g) signal is sent from the Pancon, which is the destination terminal device to which it was transmitted. Check whether the message has been sent (ST35).

If the ACK signal is not sent, that is, if it is not received, it returns to s'r34 and retransmits the data type code, and ACK (5T35 → 5T34 in the reed where No. 5 is received)
→Repeat the operation of 8T35.

Upon receiving the ACK signal, it then transmits one block of data (8T36). Check the reception of the ACK signal every time one block is transmitted (5T37).

If the ACK signal is not received, the data of that block is retransmitted (5T36), and the data of that block is retransmitted (5T37) until the ACK information is received.
→ Return 8T36 → s'r37.

When the ACK signal is received, it is determined that there is a next block (8T38), and if so, the process from 8T36 to 8T67 is performed. If there is no next block.

The power supply communication line is switched to reception, and the transmission operation from the shared I/O device 3 is ended.

Figure 4 shows terminal devices, namely personal computers 1-1, 1-2, -
. . . This is a transmission control flow at i-n 2. After each pan controller starts its operation, it is determined whether the communication line connected to the power supply wiring 2 is free (8T41). If the communication line is not free, it will wait at this step.

When the power communication line becomes free, switch the power communication line to transmission,
Send the data type code (8T42).

Then, it is determined whether or not an ACK signal has been sent from the corresponding I10 device (ST43). When the ACK signal is sent and received by Sumire, it returns to 5T42 and retransmits the data type code, ST43-+5T42-
+8Ta 5 (repeat n8 work f.

When the ACK signal is received, data for one block is transmitted (8Taa), and it is determined whether an AOK signal for this data transmission has been received (ST45).

If not received, the process returns to s'r44 and transmits the same block of data. and 5 until the ACK signal is received.
Repeat the operation of T45→8T44→8T45.

When an ACK signal is received for block data transmission, it is determined whether there is a next data block to be transmitted (
8T46). When there is a block to be transmitted next, the above process 5T44→S'l'45o) is performed again. If there is no next block, the power supply communication line is switched to reception and the transmission operation from that personal computer is terminated.

As described above, according to the input/output device sharing method for a data processing device of the present invention, a plurality of terminal devices are connected to and shared by the input/output device via power wiring, and data communication is performed through the power wiring. .

Since expensive input/output devices can be shared, the entire system can be implemented at a low cost, and since no special communication cables are used, there is no need to lay out communication cables on the floor or walls.
It has great aesthetic and disaster prevention significance.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a data processing system in which the present invention is implemented, FIG. 2 is a diagram showing a memory map of the memory built into the i10 management processor of the embodiment system shown in FIG. 1, and FIG. FIG. 1 is a diagram showing the transmission control flow of the embodiment system i10 sharing device, and FIG. 4 is a diagram showing the transmission control flow in the pan controller of the embodiment system of FIG. 1. ;computer. 2; Power wiring; 6; Shared I10 device. 4-1・4-2・-・・-・4-n; Manufactured by Power Supply Superimposition Communication 5
; Dedicated line, Device 6; Host CPU. 7; Communication interface 73-space. 8; Power superimposition communication interface book 9-1, 9-2, ---9-kHl10 device. 10;I/, o management processor・I/Sono Figure 412

Claims (1)

[Claims] (Multiple terminal devices, host CPU, and this host)
and an input/output device connected to the CPU via a dedicated communication line, each terminal device is connected to the input/output device via a power supply wiring to share the input/output device, and the plurality of terminal devices and the input/output device are connected to each other through a power supply wiring. An input/output device sharing method for a data processing device, wherein the output device performs data communication through the power supply wiring.