KR950000440Y1 - Function-display circuit for internal-type moden - Google Patents

Abstract

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Description

Function display circuit of the built-in modem

1 is an overall block diagram of a modem according to the present invention.

2 is a specific circuit diagram of FIG.

3 is a specific circuit diagram of a conventional modem.

* Explanation of symbols for main parts of the drawings

1: address decoder 2: data latching unit

3: rom 4: ram

5: serial-to-parallel converter 6: signal controller

7: signal modulation and demodulation unit 8: line switching unit

9: Function display means LED 1: Modem display unit

LED2: Off-hook display LED3: High speed transmission display

LED4: Terminal Operation Display LED5: Auto Answer Display

LED6: data reception display LED7: data transmission display

LED8: Carrier Reception Display LED9: Power Input Display

The present invention relates to a built-in modem designed to be used in a computer, and more particularly, to a function display circuit of a built-in modem configured to check the operation state of the modem from the outside of the computer through a display unit composed of a light emitting diode (LED). It is about.

A common problem encountered in connecting peripherals to a computer is how to obtain proper cabling and interfacing.

If the peripheral device is far from the computer, the long cable is simply connected. If the cable is long, the resistance and the distribution capacitance combine to form an integrated circuit, and thus the square wave is distorted to identify the digital signal.

In order to prevent such deterioration of the digital signal, the modem converts the parallel digital signal into a series of analog signals suitable for cable transmission and transmits data. The modem is composed of two main blocks, a modulator and a demodulator.

The modulator converts parallel computer data into serial format at one end of the transmission line, and the demodulator receives serial data from the other end of the transmission line and converts it to the original parallel format. There are various types of such modems depending on the type of package and the speed / intelligence level. The simplest package in the related art is an external modem. The modem connects to a computer's serial port or asynchronous adapter board with a connector cable, and the modem is equipped with another modular connector to accommodate the phone.

However, when connecting such a conventional external modem, it is necessary to select or configure a connection cable corresponding to a port of a specific computer owned.

In addition, since the external modem usually does not include a connection cable, there is a problem that a separate cable should be used separately.

Therefore, in order to solve such a conventional problem, an improved modem is designed to be used in a specific type of computer.

FIG. 3 is a detailed circuit diagram of a conventional modem. In the diagram shown in FIG. 3, an address decoder 1 which designates a address by being connected to a slot corresponding to a street address and data connected to the slot is data. The data latch unit 2 is configured to perform a function of exchanging data, and the address decoder 1 is connected to a RAM 4 which is used as a temporary storage space for compressing data to transmit and receive data. Tooth part 2 is connected with serial / parallel switching part 5 which changes data in a serial / parallel manner. In addition, the serial / parallel switching unit 5 is connected to a signal control unit 6 which receives a signal from the serial / parallel switching unit 5 and controls various functions related to the modem. A signal modulator / demodulator 7 for demodulating a digital signal into an analog signal at the time of transmission and a demodulated analog signal to a digital signal at the time of reception is connected thereto. The line switching part 8 which consists of these is connected. The rotary switching unit 8 is connected to the speaker 13 through the operational amplifier OP1 as shown in detail in FIG.

This conventional built-in modem is intended to be used by plugging an adapter board composed of the circuit shown in FIG. 3 into an expansion slot in the computer main body.

These dedicated internal modems have advantages such as short connection cables, power directly supplied from the main body's internal power supply, and software required for the modem's operation. There was a problem that it is very inconvenient to use a modem because the power supply state, that is, the operation state of the modem, cannot be checked externally as in an external modem.

Therefore, the present invention is devised to solve the above problems, an object of the present invention is to install a modem in the main body of the computer, while the circuit is connected to the modem and the outside of the computer body, the display unit consisting of LED lights The present invention provides a function display circuit of a built-in modem, which is installed so that the operation status of the modem can be known from outside the main body.

In order to achieve the above object, the present invention provides a function display of an internal modem in which a function display means is connected on an input / output line interconnecting an address decoder and a data serial / parallel switching unit, a line switching unit, and a signal control unit. In the circuit, the function display means includes: a modem use display portion for indicating the ready state for use of the modem, an off-hook display portion for indicating whether the telephone is in use by being connected on an output line connecting the mutual signal control portion and the line switching portion; When the high speed transfer operation is selected by being connected to the data bus line connecting the parallel switching unit and the signal control unit, the computer main body is connected to the high speed transfer display unit displaying the high speed operation and the input / output properties connecting the serial / parallel switching unit and the signal control unit. Terminal operation display to display the status and from the other station when the answering machine mode is selected An automatic response display unit for indicating an automatic response state when calling, a data reception display unit connected to the input / output line connecting the address decoder and the signal control unit to indicate that data is being received, and a data bus connecting the serial / parallel switching unit and the signal control unit. A data transmission display portion connected to a line to indicate that data is being transmitted, a carrier reception display portion for indicating a reception state of a carrier, a power input display portion for indicating whether power is input from a computer main body through a resistor, and each of the display portions It is characterized by consisting of a buffer connected in series through a resistor.

Hereinafter, a function display circuit of an internal modem according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of a modem according to the present invention, and FIG. 2 is a diagram showing a specific circuit diagram of FIG. In addition, in FIG. 1 and FIG. 2, the same code | symbol is attached | subjected about the part same as the part shown in FIG.

Modem mounted on the personal computer according to the present invention is an address decoder which is connected to the slot corresponding to the addressing address as a component connected to the computer main body 110, and designates the address as shown in FIG. (1) and a data latch unit (2) connected to the slot for exchanging data to perform a function, and the ROM (3) storing data and a program stored in the address decoder (1). The RAM 4 used as a temporary storage place for compressing the data to be transmitted and received is connected to each other, and the data latch unit 2 is connected to the serial / parallel conversion unit 5 for converting data in a serial / parallel manner. In addition, the serial / parallel switching unit 5 is connected to a signal control unit 6 which receives a signal from the serial / parallel switching unit 5 and controls various functions related to the modem. When transmitting, a signal modulator / demodulator 7 for demodulating the digital signal into an analog signal and, on the contrary, demodulating the analog signal into a digital signal is connected, and the signal modulator / demodulator 7 is connected to a telephone or a line. The configured rotation switching part 8 is connected. The rotary switching unit 8 is connected to the speaker 13 through the operational amplifier OP1 as shown in detail in FIG.

In the modem having such a structure, the function display means 9 is connected on the output line connecting the address decoder 1, the data serial / parallel switching section 5, and the signal control section 6 to each other. The configuration of the function display means 9 is as follows.

That is, the function display means 9, as shown in FIG. 2, includes a modem use display unit LED1 indicating a ready state for use of the modem, and an off-hook display unit for displaying whether or not the telephone 10 is in use ( LED2), a high-speed transmission display unit LED3 for displaying a high speed operation such as 2400BPS, a terminal operation display unit LED4 for displaying an operation state of the terminal, that is, the computer main body 110, and an automatic response mode can be selected. An automatic response indicator (LED5) for indicating an automatic response status when calling from the other station, a data reception indicator (LED6) for indicating that data is being received, a data transmission indicator (LED7) for indicating that data is being transmitted, and In addition, the carrier receiving display unit (LED8) for indicating the reception state of the carrier, the power input display unit (LED9) for indicating whether power is being input, and each of the display units (LED1 to LED8) through a resistor (R1 to R8) in series Consists of connected buffers 31 to 38 have.

One end of the power input display LED9 is grounded through the resistor R9.

The circuit configuration of each component of the display means 9 and the modem will be described below.

That is, as shown in FIG. 2, the data reception display section LED6 is connected to an output line connecting the address decoder 1 and the signal control section 6, and the off-hook display section LED2 is connected to the signal control section. 6) and an output line connecting the line switching unit 8, and the data transmission display unit LED7, the high speed transmission display unit LED3, and the terminal operation display unit LED4 are connected to the data serial / parallel conversion unit 5 and the signal. Connected to the data bus line connecting the control unit 6, respectively, the modem usage display unit (LED1), the carrier receiving display unit (LED8) and the automatic response display unit (LED5) are directly connected to the signal control unit (6), power input The display portion LED9 is grounded through the resistor R9.

Next, the operation and effect of the function display circuit according to an embodiment of the present invention will be described.

When power is supplied to the built-in modem in the computer main body 110 to perform the function of transmitting and receiving data using the modem, the signal control unit 6 performing the self-checking function of the modem is prepared by the signal supply terminal ( ) Is reversed from high level to low level. This signal supply stage ( The modem usage indicator LED1 connected to the LED is turned on while the conducting circuit is configured, so as to inform the user of the modem usage status.

In addition, when the data transmission / reception function using a modem is selected from the computer main unit 110, the terminal use signal terminal of the serial / parallel conversion unit 5 ( ) Is inverted to the low level and becomes active, and this signal stage ( Terminal operation display unit (LED4) connected to the) is configured by the conductive circuit is turned on so that the user can check the operation of the terminal.

Then, when the handset is lifted, the relay contact inside the telephone 10 is closed, and the telephone line is connected. At this time, the off-hook display unit LED2 of the signal control unit 6 is at a low level, and subsequently, the off-hook display unit LED2 is turned on while configuring a conducting circuit to display a state in which the handset is lifted.

This is off-hook and indicates that you are not online yet. When dialing a telephone number in this state, the modem waits for a ring to be sent from the telephone company. When the call stops after the call process ends, the modem waits for a response tone from the receiving modem, that is, the carrier. If no carrier is detected within the stored time, the originating modem will begin an auto hang-up procedure, but will notify its computer that it is on-online when the carrier is sent from the other party.

That is, when the handshaking sequence, which is the greeting process between modems, is started after the telephone line is connected, the phototransistor Q1 of the signal detector 12 connected to the line 11 through the thyristor 25 is conducting. The ring signal detection end of the signal controller 6 connected to the collector end of the phototransistor Q1 ) Becomes low level and becomes active. The ring indicator stage RI of the serial / parallel switching unit 5 connected to the collector terminal of the phototransistor Q1 together with the signal control unit 6 also becomes active.

At this time, the carrier response stage of the signal controller 6 ) Is inverted to a low level, and the carrier reception display unit LED8 is configured to turn on the conduction circuit, so that the carrier reception state can be confirmed. On the other hand, the serial and parallel switching unit 5 is the ring signal detection end ( Inform) that the receiving modem is on-line to its computer body 110.

Then, when the receiving modem informs that the data is ready to be received, the originating modem transmits its carrier signal and responds.

On the other hand, when carriers indicating high-speed operation are transmitted from the reception modem, the carrier detection terminals of the serial / parallel switching unit 5 and the signal control unit 6 ( ) Is inverted to a low level and placed in an active state, ready to operate at a high speed. The high-speed transmission display unit LED3 connected to the LED3 is configured to turn on a conducting circuit so that the user can recognize that the user is operating in the high speed mode.

Next, a description will be given of the process of switching from the originating modem to the receiving modem described so far.

When called from the other party to perform the off-hook function, the modem notifies its computer body 110 that it is on-line, and then the computer body 110 receives the signal controller 6 through the address decoder 1. Status detector By outputting the low level signal to), the interrupter that has been maintained until now is released to maintain the reception state. In addition, the reception state detection stage of the signal control unit 6 ( The data receiving display unit LED6 connected to the LED is turned on while configuring the conducting circuit so that the user can check the reception state of the data.

When the data transmission / reception process is to be auto-died, that is, to operate automatically, first, the modem is set to the transmission mode and the local command state is set. In this local command state, a command is issued from the computer to the modem. At this time, the automatic response display unit LED5 of the signal control unit 6 is inverted to a low level, and the automatic response display unit LED5 is turned on to let the user recognize that the modem is automatically transmitting and receiving function. .

In this way, the present invention, although the modem is built into the computer main body, by placing the function display means on the front of the computer main body, it is possible to visually check all operating conditions of the modem from the outside of the main body, thereby allowing the user to conveniently use the modem and personal computer. It is said to be effective.

Claims (1)

A function display circuit of a built-in modem in which a function display means (9) is connected on an input / output line interconnecting an address decoder and a data serial-to-parallel conversion unit, a line switching unit, and a signal control unit. Numeral 9 denotes whether the telephone 10 is in use by being connected to a modem usage indicator LED1 indicating a modem ready state for use and an output line connecting the signal control section 6 and the line switching section 8. When the high speed transfer operation is selected by being connected to the off-hook display unit LED2 and the data bus line connecting the serial / parallel switching unit 5 and the signal control unit 6, the high speed transfer display unit LED3 displaying the high speed operation and A terminal operation display unit (LED4) connected to the input / output phase connecting the serial / parallel switching unit (5) and the signal control unit (6) to display the operation state of the computer main body (100); Call of An automatic response display unit LED5 for displaying an automatic response image and a data reception indicator LED6 connected to the input / output line connecting the address decoder 1 and the signal control unit 6 to receive data. Connected to a data bus line connecting the parallel conversion unit 5 and the signal control unit 6 to indicate that data is being transmitted, and a data transmission display unit LED7 and a carrier reception display unit LED8 indicating a carrier reception state. And a power input display unit LED9 indicating whether power is being input through the resistor R9 and buffers 31 to 38 that are serially connected to the display units LED1 to LED8 through the resistors R1 to R8. A function display circuit of a built-in modem, which is configured.