JPS6278654A - Remote terminal control system - Google Patents

Abstract

PURPOSE:To transfer data at a high speed by providing repeaters at intervals not exceeding a prescribed distance on a signal line through which display serial data given by a display control circuit flows. CONSTITUTION:A CRT control part 22 is connected to a CRT display device 29 via a display data signal line 24 for video signals, a horizontal synchronizing signal line 25 which secures the vertical synchronization for display of the device 29 and a horizontal synchronizing signal line 26 which secures the vertical synchronization for display of the device 19. A high transmitting speed is needed for the line 24 since the video signals applied to the device 29 flow to the line 24. Thus the deterioration of signals is increased if an excessive distance is secured between a host processor 10 and a remote terminal 11. In this respect, a 10m space, for example, is secured between both repeaters 27. Thus the waveform shaping and amplification of signals are carried out by the repeaters 27.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a remote terminal control method, and particularly to a remote terminal control method that improves communication speed with a remote terminal equipped with a display device and a keyboard input device, and reduces communication costs. This relates to terminal control methods.

[Conventional technology]

FIG. 2 shows an example of a conventional remote terminal control method.

In the figure, 10 is a host processing device that processes data.

11 is a remote terminal located in a remote location and exchanges data with the host processing device 10; 12 is a CPU that fetches and executes instructions; 13 is a CRT display device that displays data;
4 is a CRT control section that controls the CRT display device 13; 15 is a KB (keyboard) input device; 16 is a KB control section that controls the KB input device 15; 17 is an external storage device such as a magnetic disk device; 18 is a printer; 19
is the I10 control unit that controls various input/output devices.

20 is a parallel bus, 31 is a communication control unit that transmits and receives data to and from the remote terminal 11 via a serial interface, and 32 is a serial signal line.

33 is a communication control unit, 34 is a CPU that controls data in the remote terminal 11, 35 is a CRT display device, 36 is a CRT control unit that controls display, 37 is a KB input device, and 38 is a KB that controls the KB input device 37.
Represents the control section.

A remote terminal control method that inputs and outputs data using a remote terminal installed at a distance from two host processing units even in a relatively small computer system, and allows the data processing functions of the host processing unit to be used in a remote location. is beginning to be used.

In FIG. 2, the case where 9 display data is transferred from the host processing device 10 side to the remote terminal 11 side.

The CPU 2 sends data to the communication control unit 31 through the parallel bus 20, and from there, sends the data to the remote terminal 11 side by serial transfer via the serial signal line 32.

On the remote terminal Il side, when the data is received, it is converted into parallel data by the 2 communication control section 33, and the parallel data is sent to the CRT control section 36. C
The RT control unit 36 converts the data into display serial data and sends it to the CRT display device 35.

Furthermore, when inputting data from the KB input device W37 on the remote terminal 11 side, the input data is transferred from the KB control section 38 to the communication control section 33 via the parallel bus 39.
sent through. Therefore.

Conversion into serial data is performed, and the input data is transferred to the host processing device 10 side by serial transfer. On the host processing device 10 side, conversion from serial data to parallel data is performed in the 1 communication control unit 31, and then by the CPU 12.

Internal processing takes place.

[Problem that the invention seeks to solve]

According to the above-mentioned conventional method, conversion between parallel data and serial data is required in the communication control unit 31 and the communication control unit 33, which makes it difficult to send data such as 2 display data at high speed. There was a problem in that the CRT display device 35 could not display data at high speed. In addition, a serial transfer interface is required, and a CP on the remote terminal 11 side is also required.
Since a control unit such as U34 for controlling data input/output is required, there is a problem in that the remote terminal 11 becomes expensive.

[Means for solving problems]

The present invention aims to solve the above-mentioned problems, and makes it possible to simplify a circuit related to remote terminal control.

Provides a remote terminal control method that can send and receive data at high speed.

Therefore, the remote terminal control method of the present invention is as follows.

The interface line between the CRT control section and CRT display device or the KB control section and KB input device is
Focusing on the fact that it is serial, with this signal line,
A host processing device is connected to a remote terminal located at an old location. That is, one aspect of the present invention is to eliminate each communication control unit that is an interface between a conventional host processing device and a remote terminal, and the serial signal line between them, and to create a CR that controls a CRT display device of a remote terminal.
The T control unit and the KB control unit that controls the KB input device of the remote terminal are provided not on the remote terminal side but on the host processing device side, and they can be directly connected to each other.
It is connected to a parallel bus in a post-processing device, and an ink face line between them and a CRT display device or KB input device is extended to a remote terminal.

Further, with respect to the signal from the CRT control section to the remote terminal, compensation for signal deterioration is performed by repeaters installed at intervals not exceeding a predetermined distance.

〔Example〕

FIG. 1 shows the configuration of an embodiment of the present invention.

In FIG. 1, the same reference numerals as in FIG. 2 correspond to those shown in FIG. Further, 21 is a remote terminal control unit provided in the host processing device 10.

22 is a CRT control section, 23 is a KB control section, 24 is a display data signal line, 25 is a horizontal synchronizing signal line,
26 is a vertical synchronizing signal line, 27 is a repeater, 28 is a serial signal line, 29 is a CRT display device, and 30 is a KB input device.

CR7 display device 29 and K in remote terminal 11
The B input device 30 is a host processing device lfl.

It is directly controlled by the circuit of the remote terminal control unit 21 provided on the side. The functions of the CRT control section 22 correspond to the functions of the conventional CRT control section 36 shown in FIG. 2, and the functions of the KB control section 23 correspond to the functions of the KB control section 38 shown in FIG. however.

CRT control section 22 and KB control section 2
3 is directly connected to the parallel bus 20, which is an internal bus of the host processing device 10.

The CPU 12 controls the CRT control unit 22 and KB control unit 23 of the remote terminal control unit 21 to control the CRT control unit 1 used for operator console control.
4 and KB control section 16.

Although the parallel bus 20 differs depending on the type of CPU,
For example, a data bus (Do to D1) consisting of 16 signal lines
5) and an address bus (AO~) consisting of 24 signal lines.
A23) and two read/write signal lines (RD, WR)
) and two IO read/write signal lines (IOR, l0
W) and three to four control signal lines.

The CRT control unit 22 and CR7 display device 29 are
and a display data signal line 24 for a video signal.

They are connected by a horizontal synchronizing signal line 25 for horizontally synchronizing the display on the CR7 display device 29 and a vertical synchronizing signal line 26 for vertically synchronizing the display on the CR7 display device 29 .

Since the video signal to the CR7 display device 29 flows through the display data signal line 24, a high transmission speed is required. Therefore, if the host processing device 10 and the remote terminal 11 are too far apart, the signal deteriorates significantly. For this purpose, repeaters 27 are interposed at intervals of, for example, 10 m, and the repeaters 27 perform waveform shaping and amplification of the signal. The serial signal line 28 connecting the KB input device 30 and the KB control unit 23 does not require high-speed data transfer, so even if it is a normal serial interface line, it can be connected to 3 lines without a repeater.
For example, it can be extended by 1 to 2 km.

As an example, the case where there is one remote terminal has been described, but the same configuration can be made even when a plurality of remote terminals are connected.

〔Effect of the invention〕

As explained above, according to the present invention, the circuits that control the display device and KB input device of the remote terminal are connected to the parallel bus in the host processing device, so that the speed is high and the communication cost can be reduced. It becomes like this.

Furthermore, one communication control section or the like is not required, and the entire circuit configuration can be simplified.

[Brief explanation of drawings]

FIG. 1 shows the configuration of an embodiment of the present invention, and FIG. 2 shows an example of a conventional remote terminal control system. In the figure, 10 is a host processing device, 11 is a remote terminal, 1
2 is a CPU, 13 is a CRT display device, 14 is a CRT control unit, and 15 is a KB input device. 16 is a KB control unit, and 17 is an external storage device. 18 is a printer, 19 is an I10 control unit. 20 is a parallel bus, and 21 is a remote terminal control unit. 22 is a CRT control section, 23 is a KB control section, 24 is a display data signal line, 25 is a horizontal synchronizing signal line,
26 is a vertical synchronizing signal line, 27 is a repeater, 28 is a serial signal line, 29 is a CRT display device, and 30 is a KB input device.

Claims (1)

[Scope of Claims] A host processing device that processes data, and a remote device installed at a location remote from the host processing device and connected to the host processing device, the device having at least a display device and a keyboard input device. In the system comprising a terminal, the host processing device is a circuit for controlling the display device installed in the remote terminal, and a display control circuit that converts parallel data into serial data for display and sends it out. , a keyboard control circuit for controlling the keyboard input device installed in the remote terminal, and arranged at intervals not exceeding a predetermined distance on a signal line through which display serial data sent by the display control circuit flows. , a remote terminal control system characterized by being provided with a repeater that performs waveform shaping.