JP2003162376A - Control device for liquid crystal touch panel display unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide such a control method and a device for liquid crystal touch panel display unit that shares liquid crystal touch panel display units among a plurality of calculating devices for control. <P>SOLUTION: The plurality of calculating devices for control 3A, 3B, 5 and 6 the plurality of liquid crystal touch panel display units 1 and 2 are connected to the same transmission line 4, and switches the interfacing destination of the liquid crystal touch panel display units 1 and 2 by selectively locking the transmission processing of the calculating devices for control 5 and 6. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the display of information stored in a control arithmetic unit and the direct touching of the displayed screen to issue a command to the control arithmetic unit. The present invention relates to a control device for a liquid crystal touch panel display. 2. Description of the Related Art FIG. 3 shows an example of a system configuration showing a conventional method of controlling a liquid crystal touch panel display. FIG. 4 shows an example of an interface signal between the liquid crystal touch panel display of FIG. It is explanatory drawing which shows a flow. That is, in the system configuration of FIG. 3, a liquid crystal touch panel display (LCD) 1 and a control arithmetic unit 5 are connected by a dedicated transmission line (Ethernet (registered trademark)) 1a, and a liquid crystal touch panel display 2 is connected. And the control arithmetic unit 6 are connected by a dedicated transmission line 2a. That is, the interface destination of the liquid crystal touch panel display is one control arithmetic device. Further, the control arithmetic unit 5 and the control arithmetic unit 6 are connected by a dedicated transmission line 5a, and the control arithmetic unit 5 and the control arithmetic unit 6 communicate with each other via the transmission line 5a. Is going. The flow of interface signals between the liquid crystal touch panel display and the control arithmetic unit is as shown in FIG. That is, when the liquid crystal touch panel display 1 and the control arithmetic device 5 interface, the signal flow is directly performed as shown in the interface circuit 7a, but when the liquid crystal touch panel display 2 and the control arithmetic device 5 interface, The signal flow is performed via the control arithmetic unit 6 as shown in the interface circuit 7b. Similarly, when the liquid crystal touch panel display 2 and the control operation device 6 interface with each other, the signal flow is directly performed as shown in the interface circuit 8a. In the case of interfacing, the signal flow is performed via the control arithmetic unit 5 as shown in the interface circuit 8b. Therefore, when one of the control arithmetic units 5 and 6 becomes abnormal, there is a problem that one of the liquid crystal touch panel displays becomes unusable. In the prior art, since the liquid crystal touch panel display can only interface with one control arithmetic unit, a dedicated liquid crystal touch panel display must be provided for each control arithmetic unit. Must. For this reason, when a system is constructed with a plurality of control arithmetic devices, the following problem occurs. (1) When a plurality of liquid crystal touch panel displays are required for one control operation device, (the number of control operation devices) and (the number of liquid crystal touch panel displays required for one control operation device) Needs to be provided, the number of liquid crystal touch panel displays needs to be provided, which not only increases the cost of system construction, but also increases the site space for installing the liquid crystal touch panel displays. (2) When interfacing with a liquid crystal touch panel display connected to another control arithmetic device, the interface must be performed via another control arithmetic device. For this reason, when an abnormality or the like occurs in another control arithmetic unit, information cannot be transmitted, and maintenance is troublesome, and operability is reduced. The present invention solves the above problems,
By sharing the LCD touch panel display among multiple control processing units, maintenance and operability as before can be maintained, and the cost of system construction and the installation space of the LCD touch panel display are maintained.
It is an object of the present invention to provide a control device for a liquid crystal touch panel display capable of reducing the cost and improving the system operation rate. A method of controlling a liquid crystal touch panel display according to the present invention comprises a plurality of liquid crystal touch panel displays, a transmission line to which these liquid crystal touch panel displays are commonly connected, and a transmission line. A plurality of control arithmetic devices commonly connected to a road, and means for locking transmission processing provided in each of the control arithmetic devices, and the locking means includes any one of the plurality of control arithmetic devices. When using any of the plurality of liquid crystal touch panel display, by locking the transmission processing by other control arithmetic devices except for any of the control arithmetic devices,
An interface destination of the liquid crystal touch panel display is switched, the plurality of liquid crystal touch panel displays each include a restart unit, and when the plurality of control arithmetic devices are switched, the interfaces of the plurality of liquid crystal touch panel displays are switched. Resetting the interface destination address. Next, an embodiment of a control device for a liquid crystal touch panel display according to the present invention will be described. FIG. 1 is a configuration diagram of a liquid crystal touch panel display showing an embodiment of the present invention. FIG. 2 is a diagram showing a flow of interface signals between the liquid crystal touch panel display of FIG. 1 and a control arithmetic unit. FIG. As shown in FIG. 1, the liquid crystal touch panel displays 1 and 2 and the control arithmetic units 5 and 6 are connected to each other via the same transmission path (Ethernet) 4. Since only one interface destination address can be set for the liquid crystal touch panel display, all the addresses on the control arithmetic device side are set to be the same. As a result, the number of control operation devices to which the liquid crystal touch panel display is connected is apparently one.
However, since the same address is mixed on the same transmission path, a communication failure may occur. For this reason, for example, when the control arithmetic unit 5 uses a liquid crystal touch panel display, the condition circuit of the control arithmetic unit 7 outputs a condition signal 7c that is closed (ON) by using the liquid crystal touch panel display, so that transmission is performed. The power supply is switched by a hardware circuit, or the transmission processing is unlocked by a software circuit to enable an interface with a liquid crystal touch panel display. Similarly, when the control arithmetic unit 6 uses a liquid crystal touch panel display, the condition circuit of the control arithmetic unit 8 is closed (ON) by using the liquid crystal touch panel display.
By outputting the condition signal 8c, the transmission power supply is switched by a hardware circuit, or the transmission processing is unlocked by software, thereby enabling an interface with the liquid crystal touch panel display. The transmission processing lock condition of the control computing units 7 and 8 is set so that a control device having the same address is not mixed on the transmission line. And a transmission lock circuit that sets other control operation device conditions to open (OFF). On the other hand, the liquid crystal touch panel display 1 and the liquid crystal touch panel display 2 become inoperable when the control arithmetic unit is switched, and the interface destination is unknown, and cannot operate. Therefore, the switching signals 3a are supplied to the restart circuits 3A and 3B for notifying that the control arithmetic devices 5 and 6 to be switched have been switched, and the liquid crystal touch panel display 1 and the liquid crystal touch panel display 2 are respectively restarted (initialized). . As described above, the connection between the liquid crystal touch panel display and the control operation device is configured, and the flow of interface signals between the liquid crystal touch panel display and the control operation device is as shown in FIG. Signal flows between the liquid crystal touch panel display 1 and the liquid crystal touch panel display 2 and the control arithmetic unit 5 are performed through interface circuits 9a and 9b.
Since the signal flow between the liquid crystal touch panel display 1 and the liquid crystal touch panel display 2 and the control operation device 6 is performed through the interface circuits 10a and 10b, the signal flow is directly performed without passing through another control operation device. Interface becomes possible. According to the control device of the liquid crystal touch panel display of the present invention, the liquid crystal touch panel display can be shared by a plurality of control arithmetic units, and the cost of system construction and the space for installing the liquid crystal touch panel display are reduced. The reduction of noise can be achieved. Further, since the interface between the liquid crystal touch panel display and the control operation device can be performed without passing through another control operation device, even if the other control operation device is abnormal, the current maintenance and operation can be performed. While maintaining the operability, the operation rate of the liquid crystal touch panel display can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system configuration diagram using a control device for a liquid crystal touch panel display according to an embodiment of the present invention. FIG. 2 is an explanatory diagram showing a signal transmission operation of FIG. 1; FIG. 3 is a system configuration diagram of a conventional device. FIG. 4 is an explanatory diagram showing a signal transmission operation of FIG. 3; [Description of Signs] 1, 2 Liquid crystal touch panel display 3A, 3B Restart circuit 3a Switching signal 4 Transmission path 5, 6 Control operation device 7, 8 Transmission processing lock circuit 7c, 8c Condition signal

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Claims (1)

Claims: 1. A plurality of liquid crystal touch panel displays, a transmission line to which these liquid crystal touch panel displays are commonly connected, and a plurality of control arithmetic units commonly connected to the transmission lines. And a means for locking the transmission processing provided in each of the control arithmetic devices, and the lock means is configured such that any one of the plurality of control arithmetic devices controls any one of the plurality of liquid crystal touch panel displays. When used, the interface of the liquid crystal touch panel display is switched by locking transmission processing by other control operation devices except for any one of the control operation devices, and the plurality of liquid crystal touch panel displays are locked. The display devices each include a restart unit, and when the plurality of control arithmetic devices are switched, the input of the plurality of liquid crystal touch panel displays is performed. Liquid crystal touch panel display control apparatus characterized by resetting the over interface address.