JPH06332591A - Display - Google Patents

Abstract

PURPOSE:To provide the display capable of constructing a flexible system by providing a controller capable of transmitting and receiving data between a host computer and a printer even through the power source of the display is off. CONSTITUTION:The state of a power supply part 52 switched by a power supply chageover means 61 is detected by a power supply on/off detection means 53. Based on the result, a data changeover means 56 is functioned to switch the data route among an interface 57, control means 55 and a interface 58.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display used by connecting to a host computer or a POS terminal.

[0002]

2. Description of the Related Art Up to now, when a host computer is connected to a display and the display is connected to a printer for use, the display controls all data transmission / reception between the host computer and the printer.

[0003]

In the prior art, since the display controls all data transmission / reception between the host computer and the printer, data transmission / reception is normally performed when the display is powered on. However, when the power of the display is off, the data from the host computer is not transmitted to the printer, and the data from the printer is not transmitted to the host computer.

[0004]

In order to solve these problems, the present invention relates to a printer and a display connected to a host computer for use, and an interface for connecting the host computer and the display, and the display and the printer. Interface, power on / off switching means, power on / off detection means, and control means for processing and displaying data from the host computer or printer, and data transmission / reception between the host computer and printer can be controlled via the display. A display having a data switching control means configured as described above and switching the data path between the host computer and the printer by turning on / off the power of the display.

[0005]

The present invention will be described in detail below.

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

Reference numeral 51 denotes the entire display, 52 is a power supply unit for supplying necessary power to each unit of the display, 61
Is a power on / off switching means for switching on / off of the power source section, 53 is a power on / off detecting means for detecting whether the power source is on or off at that time, and 54 is a display section.
Reference numeral 55 is a control means for processing the data from the host computer and for controlling the display section and the data transmission / reception with the printer. Reference numeral 56 is a data switching means for switching whether data from the host computer is transmitted to the control unit or directly to the printer, and similarly, data is switched from the printer. 57,
Reference numeral 58 is a host computer 59 and a printer 60, respectively.
It is an interface for sending and receiving data to and from.

Next, the operation will be described with reference to FIG.

The state of the power source section 52 is changed by the power source on / off switching means 61, and the power source on / off detecting means 53.
The state of the power supply unit 52 is detected by.

When the power is turned on, the data from the host computer 59 is input to the control means 55 via the interface 57, processed and then transmitted to the printer 60 via the interface 58. Similarly, data from the printer 60 is input to the control means 55 through the interface 58 and processed, and then the interface 5
It is transmitted to the host computer 59 via 7.

When the power is off, the interface 5
7 and interface 58 are directly connected so that the data between the host computer and the printer is completely transparent to the display.

FIG. 2 shows an embodiment in which a relay for switching an electric path is used as the data switching means.

Reference numeral 11 denotes a terminal 14 and a terminal 13 when the power is off.
Is connected, and the relay is configured so that the terminal 14 and the terminal 12 are connected when the power is turned on. Reference numeral 15 is a relay having the same structure as the relay 11, and the terminals 18 and 17 are connected when the power is off, and the terminals 18 and 16 are connected when the power is on. Reference numerals 19 and 20 are signal lines from the interface.

When the power is off, the terminals 14 and 13 are connected and the terminals 18 and 17 are connected at the same time, so that the signal lines 19 and 20 are directly connected. In this case, the signal lines 19 and 20 are irrespective of the state of the display.
Is in exactly the same state, and the presence of the display can be ignored.

When the power is turned on, the terminals 14 and 12 are connected and the terminals 18 and 16 are simultaneously connected, so that the signal line 19 and the signal line 20 are connected via the control unit 21.

In this case, if the signal lines 19 and 20 are data, it is possible to perform data processing and control such that certain specific data is made transparent and other data is not made to pass or data is passed after being converted. . Signal line 1
If 9 and 20 are control lines, the state of the control line can be freely controlled according to the state of the display at that time.

If the circuit of FIG. 2 is prepared for the number of signal lines that need to be controlled and the control section is enabled to perform appropriate processing, the connection between the host computer and the printer is flexible only by the on / off state of the power supply. Can be done. Although this embodiment is an example using a relay, it is also possible to use a switching electronic element such as a transistor.

FIG. 3 shows an embodiment in which a switch for mechanically switching the electric path is used as the data switching means.

Reference numeral 22 is a power switch that is switched on and off by sliding it to the left and right. Reference numerals 23 and 24 are signal line change-over switches for switching connection of three types of terminals when they are slid to the left and right. The state of the power switch 22 is transmitted to the signal line changeover switches 23 and 24 by the rod-shaped or plate-shaped state transmission member 25.

When the power switch 22 is turned on, the terminals 26 and 27 of the signal line changeover switch 23 are connected, and at the same time, the terminals 29 and 30 of the signal changeover switch 24 are connected. Therefore, the signal line 32 is connected to the signal line 33 via the control unit 34. When the power switch 22 is off, the signal line changeover switches 23 and 24 are connected to the terminals 28 and 27 and the terminals 31 and 30, respectively. Therefore, the signal line 32 is directly connected to the signal line 33 without passing through the control unit 34.

The above embodiment is an example in which the slide switch and the plate-shaped or rod-shaped state transmission member are used, but the invention can be realized by other mechanical switches or discharge transmission members.

[0022]

As described above, according to the present invention, the route of the signal line can be changed in conjunction with the turning on / off of the power supply of the display, so that the host computer, the display and the printer are connected to each other. Data transfer from the host computer to the printer is possible even when the display power is off, which greatly contributes to the realization of a flexible system configuration.

Further, since it is not necessary to replace the connection cable or a signal line switching device, the cost can be suppressed and the risk of erroneous operation can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory view showing an embodiment of the data switching control means of the present invention.

FIG. 3 is an explanatory diagram showing an embodiment of the data switching control means of the present invention.

[Explanation of symbols]

 51 ... Entire display 52 ... Power supply 53 ... Power on / off detection means 54 ... Display 55 ... Control 56 ... Data switching 57 ... Interface 58 ... Interface 59・ ・ ・ Host computer 60 ・ ・ ・ Printer 61 ・ ・ ・ Power on / off switching means

Claims (1)

[Claims] 1. A printer and a display used by connecting to a host computer, an interface connecting the host computer and the display, and an interface connecting the display and the printer.
It has a power on / off switching means, a power on / off detection means, and a control means for processing and displaying data from a host computer or a printer, and is configured so that data transmission / reception between the host computer and the printer can be controlled via a display. Power on the display,
A display having data switching control means for switching a data path between a host computer and a printer when the display is turned off.