JPH05191535A - Public telephone set - Google Patents

Abstract

PURPOSE:To easily alter and add function data on a public telephone set at the scene. CONSTITUTION:An external terminal 30 is connected to the pubilc telephone set and program data in the external terminal 30 is loaded on E<2>PROM 23 in the public telephone set. The program is executed and function data in E<2> PROM 22 is altered and added. When it is terminated, program data in E<2>PROM 23 is eliminated. Consequently, function data can be altered and added in the scene, complicated ROM exchange work becomes unnecessary and the illegal rewriting of function data with high security is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an internal E ²
The present invention relates to a public telephone that changes and adds function data in a PROM.

[0002]

2. Description of the Related Art Conventionally, a public telephone of this type has an internal RO
M and an electrically writable / erasable E ² PROM are provided, and the CPU executes a program stored in the ROM to rewrite the function data in the E ² PROM to add a new function. There is. That is, in the case of adding a highly secure new function to a public telephone, the program is changed by a personal computer or the like and the RO
This new ROM is replaced with the old ROM in the public telephone while being stored in M. Then, the password is entered by operating the dial keys and the program in the ROM is executed to change the function data in the E ² PROM, that is, the call charge data, the toll free number or the additional registration of coins used. I'm trying to do it.

[0003]

In the conventional public telephone described above, when a new function is added, the program is changed by a personal computer requiring an external power source, the program is stored in a new ROM, and the new public telephone is used. ROM and old RO
Swap with M. Then, the password is input and the above program is executed to rewrite the function data in the E ² PROM. For this reason, there is a drawback that the program cannot be changed on the spot and complicated ROM replacement work is required. Also, the above program is executed only by entering the password to rewrite the function data, and since the rewriting program is resident in the ROM, once the password is known, the function data with high security can be partially saved by others. There is a risk of illegal rewriting.

[0004]

SUMMARY OF THE INVENTION The present invention in order to solve such a problem, the second E storing a program to make changes and additional function data of the first E ² in PROM ²
A PROM, an external terminal which is connected to a public telephone and operates by the power source of the public telephone, and which stores program data stored in the second E ² PROM, and a program data in the external terminal which is stored in the second E ² PROM. Means for executing the program stored in the second E ² PROM, and means for executing the program stored in the second E ² PROM, and erasing the program data in the second E ² PROM after changing and adding the function data in the first E ² PROM. And means.

[0005]

[Function] Program data from the external terminal is the second E ²
When stored in the PROM, the stored program is executed to change and add the function data in the first E ² PROM. After that, the program data is erased.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a public telephone according to the present invention. In the figure, 1 is an office line, 2 is an office line 1
Incoming call detection circuit for detecting an incoming call signal arriving at 3 is a buzzer sounding by the incoming call signal, 4 is a billing signal receiving circuit for receiving a billing signal coming from the station line 1, 5 is a DTMF signal coming from the station line 1 A DTMF signal receiving circuit for receiving,
Reference numeral 6 is a diode bridge, and reference numeral 7 is a power supply circuit that supplies the station power supplied from the office line 1 to each part of the public telephone when off-hook. Further, 8 is a communication circuit, 9 is a handset, 10 is a signal generator for generating a dial signal, 11 is a keyboard such as a dial key, 12 is a display, 13 and 14 are input / output circuits, 15 is a bus, 16 Is a coin sorting unit for sorting and storing inserted coins, 17 is a hook switch, 18 is a start circuit which is activated by turning on a hook switch by off-hook and drives a GS relay, 19 is a CPU, and 20 is an R
OM and 21 are RAMs. Reference numeral 22 is an E ² that stores functional data such as call charge data, dial numbers for toll-free calls, and data for determining whether coins to be used can be used.
PROM and 23 are E ² PROMs in which a program for rewriting the functional data in the E ² PROM 22 is stored.

When such a public telephone goes off-hook, the hook switch 17 is turned on to activate the start circuit 18 to drive the GS relay. As a result, the contact gs1 is closed and the loop of the office line 1 is closed. Power is supplied to each part via the power supply circuit 7, and contact g
By closing s2, power is supplied to the CPU 19, and the CPU 19 starts processing. Then, when a coin is inserted, the dial transmission becomes possible. When the dial key on the keyboard 11 is operated to dial the other party's number, the CPU 19 inputs it to generate a dial signal from the signal generating unit 10 to generate the dial line 1. Send to. As a result,
When the other party calls and the other party answers the call, a billing signal arrives, the inserted coins are stored, and a call with the other party is started. When the call is continued thereafter, the coins to be inserted are stored by the charging signal which periodically arrives, and when the coins to be stored are exhausted, the loop of the central office line 1 is forcibly opened.

When an incoming call arrives, the buzzer 3 sounds through the incoming call detection circuit 2, and the contact gs1 is closed off the hook to close the incoming call. Note that coins are not stored in this incoming call.

Next, FIG. 2 is a diagram showing the setting status of the function data in such a public telephone. The terminal 30 is connected to the public telephone and the rewriting program of the function data is transferred from the terminal 30 into the E ² PROM 23. It was designed to be loaded. It should be noted that the terminal 30 is operated by a power source from a connected public telephone, that is, a station power source without having a power source inside. Further, FIG. 3 shows the CPU 19 in this public telephone.
It is a diagram showing a memory map of, where 0 to 1FFF address is I
/ O area, RAM 21 area from 2000 to 3FFF,
Addresses 4000 to 5FFF are E ² PROM 23 area, 60
Addresses 00 to 7FFF are E ² PROM22 area, 8000
The address FFFF is the ROM 20 area.

Next, FIG. 4 shows the CPU of such a public telephone.
19 is a flow chart showing the operation of No. 19, which sets the public telephone in the test mode state, loads the program data changed in advance and stored in the terminal 30,
This shows the operation of changing the function data by executing this. That is, when the CPU 19 is off-hooked in step 50 to be supplied with power and reset, and then the reset is released, the test mode is activated in step 51.

In such a test mode state, a command input by a predetermined dial key operation in the keyboard 11 is judged in step 51. When a command is input, what kind of instruction command this is is judged in each of step 53, step 60 and step 70. That is, if the input command is the command 1 indicating uploading of the program and it is determined as “Y” in step 53, it is determined in step 54 whether or not the terminal 30 is connected. Here, an identification code is given to the terminal 30, and even if the terminal 30 is connected to a public telephone, it is determined to be unconnected unless it matches the identification code of the public telephone. Therefore, the program data cannot be loaded even if the terminal 30 that does not match the identification code of the public telephone is connected. Then, when the identification code with the terminal 30 matches and it is determined that the terminal 30 has a connection, the checksum of the program data stored in the terminal 30 is checked in step 55, and if it is normal (step 56). In the case of "Y"),
Upload the program data and the checksum data of this program data from the terminal 30 to E ² PRO
Write to M23 (step 57). Then, it is judged whether or not this program data upload is successful (step 58), and if the data upload is successful, the checksum data of the uploaded program data is compared with the actual checksum result of the uploaded program data. However, if the two match, it means that the upload was successful and the process returns to step 52 to wait for the input of the next command.

[0012] In this way, E ² PROM2 from the terminal 30
When the program data is normally uploaded to 3,
The input operation of the command 2 instructing the execution of the uploaded program is performed. That is, when the command 2 is input, "Y" is input in steps 52 and 60.
In this case, the check sum of the program data incorporated in the E ² PROM 23 is checked again (step 61), and if the check result is normal (in the case of “Y” in step 62), it is incorporated. The program is executed to rewrite / add function data such as call charge data stored in the E ² PROM 22, dial numbers for toll-free calls, and data for determining whether coins to be inserted can be used (step 63). .. Then, the process returns to step 52 and waits for the next command input.

After that, when command 3 is input to indicate deletion of the uploaded program data, it is determined to be "Y" in steps 52 and 70, and in this case, the program data incorporated in the E ² PROM 23 is deleted. At the same time (step 71), the checksum is rewritten due to this deletion (step 72), and the process returns to step 52.

As described above, the external terminal 30 is connected to the public telephone, the program data in the external terminal 30 is loaded into the E ² PROM 23 in the public telephone, and the program is executed to store the function data in the E ² PROM 22. In addition to making changes and additions, the program data in the E ² PROM 23 is deleted after this is completed. When the function data is set in the E ² PROM 22,
The CPU 19 starts normal processing such as calling processing and billing processing while referring to the function data as necessary.

If the terminal 30 is not connected when the command 1 is input and the answer is "N" in step 54, the terminal 30
As a result of checking the checksum of the program data in the area, the result is NG, and if the result is “N” in step 56, the program data from the terminal 30 cannot be loaded normally and step 5
If it is “N” at 8, 59, or if the checksum result of the program data in the E ² PROM 23 when the command 2 is input becomes NG and it is determined as “N” at step 62, the steps are respectively performed. At step 81, an error is displayed on the display unit 12, and it is judged at step 81 that the cancel key is input using the specific dial key on the keyboard 11. When the cancel key is input, the process returns to step 52 to load the program data from the external terminal 30 again. If the input command does not correspond to any of the commands 1, 2 and 3, the normal test program is executed in step 80.

[0016]

As described above, according to the present invention, an external terminal is connected to a public telephone to send program data to the second E terminal.
^Since the function data in the first E ² PROM is changed and added by transferring the program to the ² PROM and executing the transferred program, it is possible to change and add the function data in the field. At the same time, complicated ROM replacement work becomes unnecessary. Further, since the program data is erased after the function data is changed or added, there is an effect that it is possible to prevent unauthorized rewriting of the function data with high security.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a public telephone according to the present invention.

FIG. 2 is a diagram showing a setting status of function data for the public telephone.

FIG. 3 is a diagram showing a memory map of a CPU in the public telephone.

FIG. 4 is a flowchart showing an operation of the CPU.

[Explanation of symbols]

1 station line 4 billing signal receiving circuit 7 power supply circuit 9 handset 10 signal generator 11 keyboard 12 indicator 16 coin sorting section 17 hook switch 18 start circuit 19 CPU 22, 23 E ² PROM

Claims (1)

[Claims] 1. A ROM and an electrically writable / erasable first E ² PROM are provided, and a program stored in the ROM is executed to change functional data in the first E ² PROM. In a public telephone to be added, a ^second E ² PROM storing a program for changing and adding the function data in the first E ² PROM, and connected to the public telephone and operated by a power source of the public telephone an external terminal for storing program data to be stored into the second E ² PROM with, means for storing the program data in the external terminal to the second E ² PROM, to the second E ² PROM means for executing the stored program, erase the program data of the change of the first feature data in the E ² PROM and the rear additional second E ² PROM Public telephone, characterized in that a means that.