JPH0332260B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a parameter input method for a public telephone that allows efficient parameter input.

[Conventional technology]

Currently, in devices with a built-in CPU, it is common to store parameters used in calculations in addition to programs and the like.

FIG. 3 is a block diagram schematically showing the main parts of the public telephone described in Japanese Patent Application No. 163889/1989.

In this figure, 1 is a CPU, 2 is a ROM, 3 is an input section, 4 is an output section, and 5 is a parameter storage section consisting of PROM, etc., which stores the amount of coins, call charges, and types of calls required for the operation processing procedure. A dial number code, etc. used for identification is stored as a parameter. 6 is a detection device for detecting signals generated when a public telephone performs normal operations;
A hook switch for detecting hook-on and hook-off, a dial key switch for detecting and inputting the number dialed by the user, a billing signal receiving circuit for receiving and detecting billing signals, and a detection device for detecting the presence of a safe and when the safe is full. It includes a loop current detection circuit for detecting circuit and line polarity.

7 is RAM. The arithmetic control results obtained by the CPU 1 and the detection device 6 obtained via the input section 3
Memorize the signal from. 8 is a display device.

In public telephones with such a configuration, parameters such as coin amount, call charge, dial number code, etc. are stored in the parameter storage unit 5 consisting of PROM, so when changing these parameters, the PROM must be replaced. It was done by

[Problem that the invention seeks to solve]

However, with the conventional method of replacing PROMs as described above, it is necessary to write to each PROM, it is necessary to attach an identification label to the PROM, and mounting to the IC socket on the board is also cumbersome. There was a problem.

There were also other problems, such as poor contact during mounting into an IC socket.

The present invention was made to solve this problem, and an object of the present invention is to provide a parameter input method for a public telephone set that allows parameters to be easily changed.

[Means for solving problems]

A parameter input method for a public telephone according to the present invention connects a parameter input device to an input section of the public telephone, and transmits a copy signal from a switch means to a control section to instruct the parameter input, thereby controlling the parameter input device. The master parameter storage section reads the parameters from the master parameter storage section and then writes them to the storage section.

[Effect]

In this invention, parameters read from a master parameter storage section within the parameter input device are written into a storage section within the public telephone via the input section.

〔Example〕

FIG. 1 is a diagram for explaining an embodiment of the parameter input method for a public telephone according to the present invention.

In this figure, the same reference numerals as in FIG. 3 indicate the same parts, 2a is a ROM in which a copying program for importing parameters is stored, 7a is a RAM in which parameters are imported, and 9 is a writable/readable parameter storage unit. , 10 is a detachable parameter input device, 10a is a switch means,
Reference numeral 10b is a master parameter storage unit in which master parameters are stored at addresses set so that the contents cannot be read without using a ^{predetermined} program. used.

Next, we will discuss the parameter rewriting operation in the second section.
This will be explained with reference to a flowchart showing the basic operation shown in the figure.

First, the master parameter storage section 10b in which master parameters are stored is set in the parameter input device 10.

Next, after connecting the parameter input device 10 to the input section 3, a copy signal is sent from the switch means 10a to instruct the CPU 1 to import the parameters. The CPU 1 detects the input of the copy signal from the switch means 10a (step 1), and when the copy signal is detected, the ROM 2a
The program stored in the computer is read out (step 2) and operates according to the program. Next, the master parameter in the master parameter storage section 10b is read out via the input section 3 and stored in the RAM 7a.
(Step 3). Also, at this time, the parameters stored in the RAM 7a are displayed on the display device 8. Then, after the CPU 1 erases the old parameters in the parameter storage section 9, the parameters can be rewritten by writing only the parameters stored in the RAM 7a that meet certain conditions into the parameter storage section 9 (step 4). finish.

If the parameter input device 10 is made portable,
There is a risk that a malicious person may read parameters etc. using a device other than a public telephone, and similarly, the parameter input device 1
There is a risk that parameters may be tampered with by a device that imitates 0.

Therefore, in order to prevent this, in this embodiment, in addition to sending out a predetermined copy signal from the switch means 10a to start the program as described above, a predetermined program is not used in the master parameter storage section 10b. Since the master parameters are stored with addresses set so that they cannot be read, the contents cannot be read even if a device other than a public telephone equipped with a predetermined program is used. Conversely, even if a pseudo copy signal is sent, if the parameters used for tampering are not stored at an address corresponding to the above-mentioned predetermined program, the master parameters will not meet certain conditions when read out. The parameters are not imported into the storage unit 10b, and tampering with the parameters is also prevented.

In other words, parameters can be rewritten only when the parameter input device 10 is connected to other devices and the same operation is performed, and one master parameter can be rewritten without having to implement individual PROMs as in the past. A plurality of parameters can be rewritten in a short time using one parameter input device 10 equipped with the storage section 10b.

In addition, costs can be reduced by not replacing the PROM, and contact failures at the IC socket that occur when replacing the PROM do not occur.

〔Effect of the invention〕

As explained above, the present invention connects a parameter input device to the input section of a public telephone, and transmits a copy signal from the switch means to the control section to instruct the control section to input parameters. Since the parameters in the master parameter storage section are read out by the master parameter storage section and then written into the storage section, the labor and cost when changing the parameters can be reduced, and the parameters can be changed easily. In addition, it is possible to prevent falsification of parameters, and there is also an effect that reliability does not deteriorate due to parameter modification work.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining an embodiment of the parameter input method for a public telephone according to the present invention, FIG. 2 is a flowchart for explaining the parameter input method according to the present invention, and FIG. FIG. In the figure, 1 is a CPU, 2 and 2a are ROM, 3 is an input section, 4 is an output section, 7 and 7a are RAM, 8 is a display device, 9 is a parameter storage section, 10 is a parameter input device, and 10a is a switch means , 10b is a master parameter storage unit.

Claims (1)

[Claims] 1. A parameter input method for a public telephone that has an input section, a storage section that stores parameters that define operating conditions of the public telephone, and a control section that controls writing/reading of the storage section. A parameter input device is connected to the input section of the public telephone, the parameter input device having a switch means for sending a copy signal to the public telephone to instruct the public telephone to import parameters, and a master parameter storage section storing master parameters. , a public telephone set in which the control unit of the public telephone unit reads the parameters in the master parameter storage unit and then writes them into the storage unit by sending a copy signal from the switch means. Parameter input method.