JPH0630013B2 - CRT display controller - Google Patents

Description

Detailed Description of the Invention A. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CRT display control device that causes a CRT terminal device capable of screen control to display data from a plurality of programmable controllers (hereinafter referred to as PCs) arranged at a distance.

B. SUMMARY OF THE INVENTION The present invention is a CRT display control device capable of exchanging data between a plurality of remotely arranged PCs and a CRT terminal device capable of screen control with data from the outside. When shared with multiple PCs installed, a sub controller is installed on the CRT terminal device side
By enabling the smooth transfer of data between the PC and CRT terminal device selected by the operation specification switch, the number of data transmission lines between the PC and CRT terminal device can be reduced to the required minimum number and is in operation. The PC can be easily identified by providing an operation display on the sub-controller.

C. Conventional technology Conventionally, a control system using a CRT terminal device required high-level computer technology, but with the progress of microcomputer technology in recent years, a CRT terminal has a built-in microcomputer to control main screens. An easy-to-use CRT terminal was developed. FIG. 4 is a block diagram of a CRT terminal device incorporating the above microcomputer. Reference numeral 1 denotes a communication control unit connected to, for example, a computer (not shown). The communication control unit 1 embeds data from the computer, It is supplied to the screen number designation unit 3. The output of the embedded data control unit 2 is supplied to the screen memory unit 4 to store the data. A switching unit 5 is switched by the output of the screen number designating unit 3, and is a predetermined screen memory among N screen memories 6a to 6n having a preset screen number, for example, a screen memory. The contents of 6a are supplied to the screen memory unit 4.

In the screen memory unit 4, the output of the embedded data control unit 2 is input to the content of the screen memory 6a, and a part of the content is rewritten with new data (content). The contents of the rewritten screen memory unit 4 are displayed on the CRT 8 via the screen control unit 7. Reference numeral 9 is a light pen, and the output of the light pen 9 is input from a light pen position detection unit 10 to a computer (not shown) via the communication control unit 1.

The CRT terminal device configured as described above is a PC that does not require knowledge of software recently and can be easily changed.
It has come to be used in combination with. In this case, it is preferable to combine a plurality of PCs with the CRT terminal device from the viewpoint of use efficiency.

D. Problems to be Solved by the Invention Conventionally, since a computer of a CRT terminal device required a high level of function, it was a usage pattern in which a plurality of CRT terminal devices were combined. However, the high performance of CRT terminals has made it possible to use a small-capacity PC as a substitute for a computer. Therefore, one CR using multiple PCs
An application form that shares the T terminal device is required. As described above, a plurality of transmission lines are required for mutual connection between a plurality of PCs and one CRT terminal device. Especially when the PC is located farther than the CRT terminal device, multiple transmission lines will be installed,
Transmission line cost and space are issues. Also, multiple PCs
Since only one set is used among the plurality of transmission lines, the remaining transmission lines are wasted and the use efficiency of the transmission lines is extremely poor.

E. Means for Solving the Problems This invention is provided with a plurality of PC groups arranged at a distance, and is provided corresponding to these plurality of PC groups, and exchanges data.
A plurality of sub-controller groups that perform via a set of transmission lines,
A PC operation designating switch that is provided corresponding to the plurality of PC groups and outputs a switch data signal that operates by designating only one PC, and switch data that connects these switches to the plurality of sub-controller groups. Between the priority determination circuit that is inserted in the signal supply path and determines the highest priority of the switch data signal and sends it to the sub-controller, and the sub-controller connected to the sub-controller group and selected by the switch data signal. And a CRT terminal device for exchanging data and controlling the screen by the data of the PC.

F. Operation With the above configuration, data transmission is performed between the PC specified by the PC operation specification switch and the CRT terminal device, so data transmission between the PC and CRT can be performed using only two sets of transmission lines. It can be carried out. Therefore, the minimum required transmission line is installed between the PC and the CRT terminal device installed at a distant place, and the labor can be saved, and the use efficiency of the transmission line can be improved. You can

G. First Embodiment FIG. 1 is a block diagram showing an embodiment of the present invention.
In the figure, a _first PC ₁ and a second PC ₂ composed of a plurality of PC _{11 to} PC _n1 and PC _{12 to} PC _n2 are provided far from a monitoring station (not shown), and these first PC ₁ and second PC ₂ groups are the first and _second PC ₂ groups. Connected to multiplexers MPX ₁ and MPX ₂ . The first and second multiplexers MPX ₁ and MPX ₂ are placed at a third position which is distantly arranged.
And fourth multiplexers MPX ₃ and MPX ₄ and transmission lines CA ₁ and CA ₂
Connected by. SUB _{1 to} SUB _n are sub-controllers, and these sub-controllers SUB _{1 to} SUB _n are multiple PC _{11 to} PC _n1 (PC
_{12 to} PC _n2 ). These sub-controllers SUB _{1 to} SUB _n are connected to the third and fourth multiplexers MPX ₃ and MPX ₄ .

SW _{1 to} SW _n are PC-designated switches provided corresponding to the number of multiple PC _11- PC _n1 (PC _12- PC _n2 ).
Switch data signals SW ₁ to SW _n are input to the priority determination circuit PJC. The priority determination circuit PJC is for determining which switch signal input is valid. It should be noted that there are generally a prior operation priority method and a subsequent operation priority method as the validity determination method, and either one is used depending on the usage conditions. The priority judgment signal JO ₁ ~JO _n decision circuits PJC is supplied to the fifth multiplexer MPX ₅ is supplied to the SUB ₁ ~SUB _n via respective switch signal supply line SWC ₁ ~SWC _n. This fifth multiplexer MPX ₅ and sub controllers SUB _{1 to} SUB _n
And are connected by a transmission line. CRT is a CRT terminal device, and this CR
The T terminal device is connected to the fifth multiplexer MPX ₅ . Incidentally, L ₁ ~L _n is a lamp L ₁ ~L _n as a PC operating a display element which is illuminated controlled by the output of the sub controller SUB ₁ ~SUB _n, any PC operating from the lighting of the lamp L ₁ ~L _n You can identify what is inside.

COM _{1 to} COM _n are comparison units, and the comparison units COM _{1 to} COM _n have the first
PC ₁ and second PC ₂ PC _{11 to} PC ₁₂ , PC ₂₁ and PC ₂₂ ... PC _n1 and PC _n2
Is input, and a signal in which two sets of inputs match each other is output.

Next, the operation of FIG. 1 will be described. First, the PC designated switch SW _{1 to} S
When any one of W _n is operated, the switch signal is input to the priority determination circuit PJC. For convenience of explanation, the case where SW ₁ is operated will be described below. The priority determination circuit PJC makes determination in the above-described manner and sends the determination signal JO ₁ to the output.
This judgment signal JO ₁ is supplied to the sub-controller SUB ₁ and the fifth multiplexer MPX ₅ via the switch signal supply path SWC ₁ . Judgment signal supplied to sub-controller SUB ₁
JO ₁ is a transmission line C from the _third and fourth multiplexers MPX ₃ and MPX _4.
A _1, first through the CA _2, the second multiplexer MPX _1, MPX ₂
Is supplied to. The first and second multiplexers MPX ₁ and MPX ₂ operate PC ₁₁ and PC _{12 according} to the input determination signal JO ₁ . When the PC ₁₁ and PC ₁₂ are operated, the operation signal is input from the first and second multiplexers MPX ₁ and MPX ₂ to the third and fourth multiplexers MPX ₃ and MPX ₄ via the transmission lines CA ₁ and CA _2. It
The multiplexers MPX ₃ and MPX ₄ supply the operation signals of PC ₁₁ and PC ₁₂ to the sub-controller SUB ₁ . Then, the lamp L _{1 serving as the} PC operation display is turned on. By this lighting, PC ₁₁ ,
It can be identified that the PC ₁₂ is operating.

The second PC ₂ group consisting of PC _{12 to} PC _n2 and the second and fourth multiplexers MPX ₂ and MPX ₄ are provided to operate the comparison units COM _{1 to} COM _n in order to improve the output reliability. Therefore, the following describes the first PC ₁ group consisting of PC _{11 to} PC _n1 as an example.

When the PC ₁₁ becomes operational as described above, the CRT terminal device and P
Data can be exchanged with C ₁₁ . That is, when data is sent from the light pen (not shown) of the CRT terminal device, the data is sent to the fifth multiplexer MPX ₅ ,
The sub-controller SUB ₁ , the third multiplexer MPX ₃ , the transmission line CA ₁ , and the first multiplexer MPX ₁ are input to the PC ₁₁ . The light pen data input to the PC ₁₁ is processed here, and the resulting output signal is supplied to the CRT terminal device through the route opposite to the above. The PC ₁₁ is also controlled by the external data supplied from the input 1, and the data at that time is supplied to the CRT terminal device as described above.

Though the distance between the CRT terminals and a plurality of PC ₁₁ to PC _n1 as described above is separated can exchange data minimum the number of transmission paths also.

Next, the configuration of the sub-controller SUB ₁ will be described with reference to FIG. In FIG. 2, reference numeral 21 is a fifth multiplexer.
In the first transmission / reception unit that performs data transmission with the MPX ₅ , the reception data of the transmission / reception unit 21 is input to the light pen position data unit 23 via the conversion unit 22. Light pen position data section 23
Output of the first demultiplexer DMPX2 via the sixth MPX ₂₄
Entered in 5. The output of the first demultiplexer DMPX25 is supplied to the second and third transceivers 26 and 27. The second and third transmission / reception units 26 and 27 are the third and fourth multiplexers MP of FIG.
Connected to X ₃ and MPX ₄ . Reference numeral 28 is a seventh MPX to which the received data from the second and third transmitting / receiving units is input, and the output of this seventh MPX28 is input to the second DMPX29. The second DMPX 29 discriminates the screen embedding data and the screen number data from the inputted data and causes the embedding data unit 30 and the screen number data unit 31 to input them respectively. The output of both data sections 30 and 31 is the conversion section
It is supplied to the 8th MPX34 via 32 and 33. The output of the eighth MPX 34 is supplied to the fifth multiplexer MPX ₅ shown in FIG. The judgment signal JO ₁ is the 6th M
The lamp L _{1 that} is supplied to the PX24 and serves as the operation indicator of the PC is the second
Connected to DMPX29.

In the sub-controller SUB ₁ configured as described above, the third
The data transmitted from the multiplexer MPX ₃ is sent to the 7th MPX 28 via the 2nd transmission / reception unit 26, and further the 2nd DMPX29
Supply to. This second DMPX 29 outputs high speed data for the CRT terminal such as low speed data for lighting the lamp L ₁ which is the operation display of the PC ₁₁ , screen embedding data and screen number data separately. These data are sent from PC ₁₁ . The data output from the second DMPX 29 is input to the conversion units 32 and 33 via both data units 30 and 31.
The conversion units 32 and 33 are for adapting the data to the CRT terminal device. The data transmitted from the conversion units 32 and 33 is input from the first transmission / reception unit 21 to the CRT terminal device via the fifth multiplexer MPX ₅ .

The light pen position data from the CRT terminal is
The data is supplied from the multiplexer MPX ₅ to the first transmission / reception unit 21, and converted by the conversion unit 22 into data compatible with the PC. Converter
The data sent from 22 is supplied to the sixth MPX 24 via the light pen position data section 23. The decision signal JO ₁ of the priority decision circuit PJC is supplied to the sixth MPX 24. The output of the sixth MPX24 is supplied to the second and third transceivers 26 and 27 via the first DMPX25.

Next, Fig. 3 shows the configuration of the PC ₁₁ . In FIG. 3, 41 is an input processing unit to which the input 1 data shown in FIG. 1 is supplied. 42 is an all-point part state memory, which is a memory in which the screen of the CRT is divided into a predetermined number and data corresponding to the number of the divided areas is stored. This memory 42 is a memory switching unit
Predetermined data is read by 43. The data read from the memory 42 is input to the screen embedded data creation unit 44 for displaying the data on the CRT. The embedded data created by the data creating unit 44 is sent to the transmission line CA ₁ via the _first MPX ₁ shown in FIG.

The input processing unit 41 uses the change data generation signal 41a and the input data status position address signal 4 when the data of the input 1 changes.
1b and these signals 41a and 41b are transmitted to the first gate circuit 45.
Entered in. When the first gate circuit 45 receives the signal 41a, it opens the gate and sends out the signal 41b. The signal 41b is given to the memory switching unit 43 via the OR circuit 46. The memory switching unit 43 reads out data from a predetermined address of the memory 42 according to the input signal 41b (data state position address number) and supplies it to the data creating unit 44.

The change data generation signal 41a is also supplied to the inhibition terminal of the second gate circuit 47, but the gate of the second gate circuit 47 is closed when this signal is present, so that the output signal is not sent. An address update signal from the screen data address updating unit 48 is sent to the second gate circuit 47 every one scanning cycle of the PC according to the number of screens. The address update signal divides the data for one screen corresponding to the screen number command signal that specifies the screen number of the tens of display screens for each PC scanning cycle, and specifies the desired data address. This address update signal is supplied to the memory switching unit 43 through the second gate circuit 47. The memory switching unit 43 reads out predetermined data from the memory 42 and supplies it to the data creating unit 44.
The screen number command signal is sent to the first multiplexer MPX ₁ shown in FIG. The light pen position data is supplied from the first multiplexer MPX ₁ to the light pen input processing unit 49, and the output of the input processing unit 49 is input to the comparison unit COM ₁ shown in FIG. 1 via the output processing unit 50. To be done.

Here, the operation of FIG. 3 will be described. When no data arrives at the input processing unit 41, the change data generation signal 41a is not sent from the input processing unit 41. Therefore, the first gate circuit 45 remains closed. On the other hand, the gate of the second gate circuit 47 is open because there is no change data generation signal 41a.
Therefore, an address update signal is supplied from the screen data address updating unit 48 to the memory switching unit 43 via the second gate circuit 47 at each scanning cycle of the PC. Since the address of the desired data belonging to the screen is given to the address update signal,
You can see which address data is displayed. At this time, the memory switching unit 43 uses the all-point state memory 42 to store the embedded data for all points required for the screen, for example, 200 points in the PC.
For example, 25 points for each one cycle of the sequence are sequentially passed through the screen-embedded-data creating section 44 to the first multiplexer MP.
Send to X ₁ .

Here, when the change data generation signal 41a is input to the first gate circuit 45, the gate of the first gate circuit 45 opens and the input data state position address signal 41b passes through the first gate circuit 45 and the memory switching unit 43. Is supplied to. The memory switching unit 43 reads out data corresponding to the number of addresses of the address signal 41b from the memory 42 and inputs it to the data creating unit 44. This data creation unit 44
Is transmitted from the first multiplexer MPX ₁ to the CRT terminal device, and the data is displayed at a predetermined screen position of the CRT terminal device.

H. EFFECTS OF THE INVENTION As described above, according to the present invention, the transmission lines required for data transmission between the CRT terminal device and the PC group arranged at a distant place are installed only in the minimum necessary amount. There are advantages that the cost and space can be greatly reduced and the use efficiency of the transmission path can be improved.

[Brief description of drawings]

1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a detailed block diagram of a sub-controller in the embodiment of FIG. 1, and FIG. 3 is a detailed block diagram of a PC in the embodiment of FIG. Block diagram, Fig. 4 shows CR with built-in microcomputer
It is a block diagram of a T terminal device. PC ₁ , PC ₂ ... First and second programmable controller group,
MPX _{1 to} MPX ₅ ... First to fifth multiplexers, SUB _{1 to} SUB _n ...
Sub-controller, L ₁ ~L _n ... lamp, PJC ... priority determination circuit, SW ₁ ~SW _n ... programmable controller specified switch, CRT ... CRT terminal.

Claims (1)

[Claims] 1. A plurality of programmable controller groups arranged at a distance from a monitoring station, and a plurality of sub units arranged at the monitoring station, corresponding to the plurality of programmable controller groups, and for exchanging data. A controller group, a programmable controller-designated switch group which is provided corresponding to the plurality of programmable controller groups and which sends a switch signal for designating and operating only one programmable controller, and these switch groups and sub-controller groups. A priority determination circuit which is inserted in a switch signal supply path to be coupled and determines the highest priority of the switch signal and sends it to one sub-controller; and a sub-controller coupled with the sub-controller group and selected by the switch signal. Data exchange between the programmer and CRT, characterized in that a CRT terminal device screen control Le controller data is carried out
Display controller.