JP3004498B2 - Conversion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a modulation / demodulation device according to a first interface and a conversion device for connecting to a terminal device according to a second interface.

[0002]

2. Description of the Related Art Modem devices such as modems are connected to terminal devices such as personal computers via a specific interface. As used herein, the term “interface” refers to a physical and logical protocol defined for two or more devices to communicate with each other, and specifically includes a communication protocol, signal input / output timing, and a connector. Is defined as a rule concerning the shape, pin arrangement, etc. The interface is selectively used according to the usage of the modem and the terminal device. For example, when the modulation / demodulation device is a card-type modulation / demodulation device, an interface dedicated to the card type is adopted so as not to impair the portability of the modulation / demodulation device. Card-type modems have no physical space for large power supplies. for that reason,
The card-type modem is supplied with power from a terminal device via an interface dedicated to the card-type.

[0003]

As described above, the card type modulation / demodulation device follows the card type dedicated interface. Therefore, it is not possible to directly connect a card-type modulation / demodulation device to a terminal device that follows a conventionally used general-purpose interface. The reason is that since different interfaces have different rules such as signal types and signal input / output timings, signals cannot be directly transmitted and received between devices that follow different interfaces. Further, the card-type modem does not have a physical space for providing a connector or a power supply compatible with a general-purpose interface.

[0004] Therefore, it is impossible to replace a conventional modem having a power supply, which is a modem according to a general-purpose interface, with a card-type modem as it is. As a result, conventionally, it has not been possible to connect a card-type modem to a terminal device that follows a general-purpose interface.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a conversion device for interconnecting a modem device and a terminal device according to different interfaces. It is an object of the present invention to provide a conversion device for connecting a card-type modulation / demodulation device according to (1) to a terminal device according to a general-purpose interface.

[0006]

Converter of the present invention SUMMARY OF THE INVENTION, the first connector and Henfuku <br/> regulating device having in accordance with the first interface and the second connector according to the second interface
Connectable to the a terminal having, the modified demodulator
And a conversion device provided outside the terminal device, which can be electrically connected to a first connector of the modulation / demodulation device.
Modem according to the first interface configured as described above.
And use the connector, electrically to a second connector of該該terminal
According to the second interface configured to be connectable to
A connector terminal, the modem connector and said
It is connected to the terminal connector, the connector for the modem
Converts the signal input from the data to conform to the interface of the second output to the connector the terminal device, the
The modem for co converts the signal input from the terminal connector to fit to the first interface
And signal converting means you output connector, connectors for the modem
Through Kuta and a to that power supply means supplying power to the displacement demodulation apparatus provided outside of the converter,
Thereby, the above object is achieved.

[0007] Preferably, the first interface is an interface dedicated to a card.

[0008] The first interface is a JEIDA
It is preferable to conform to the above standard.

The first interface has an RS-2 connection for electrical connection and signal input / output timing.
It does not have to conform to the RS-232C standard, and it does not have to conform to the RS-232C standard with respect to the physical connector shape and operating voltage range. The second interface preferably conforms to the RS-232C standard.

[0010]

The converter of the present invention is connected to a modem through a modem connector, and is connected to a terminal through a terminal connector. As a result, the modem and the terminal device are connected in a state adapted to the respective interfaces. When a signal needs to be converted between the modem and the terminal device, the signal is converted by a signal conversion circuit. Furthermore, by the power supply circuit,
Power is supplied to the modem through the modem connector.

[0011]

The present invention will be described below with reference to examples.

(Embodiment 1) FIG. 1 shows the configuration of a conversion apparatus according to the present invention, together with a modulation / demodulation apparatus and a terminal device connected to the conversion apparatus.

The modem 10 is a card-type modem. The card-type modulation / demodulation device is, for example, a main body having a dimension of 54.0 mm in length × 85.6 mm in width × 5.0 mm in height.
Degree device. The modem is usually called a modem, and is connected to a terminal device for communication with another terminal device installed at a remote place via a telephone line. Recently, as terminal devices have been miniaturized, card-type modems having excellent portability have been developed. Conventionally, in order to connect such a card-type modulation / demodulation device to a terminal device, it has been necessary to provide a new card-type dedicated connector in the terminal device and insert the card-type modulation / demodulation device into the connector. The conversion device of the present invention connects a card-type modulation / demodulation device to a terminal device without newly providing a card-type dedicated connector in the terminal device.

Referring to FIG. 1, a modem 10 includes a telephone line connector 13 for connecting to a telephone line, a first connector 11 and a second connector 14 for connecting to another device, and a modem. It has a circuit 12. The modem circuit 12 is electrically connected to each of the first connector 11, the second connector 14, and the telephone line connector 13.

The telephone line connector 13 receives an analog signal having a telephone line signal band (300 Hz to 3400 Hz) and sends the analog signal to the modem circuit 12. The modulation / demodulation circuit 12 converts the analog signal into a digital signal. The converted digital signal is supplied to the first connector 11 and the second connector 14.

The first connector 11 is a JEIDA version 4.1 (PC
(MCIA Release 2.0).
The second connector 14 conforms to the RS-232C standard, which is widely used as an external connection interface for a computer, with respect to the electrical connection relationship and the timing of signal transmission and reception. However, the second connector 14 does not conform to the RS-232C standard with respect to the physical connector shape and the operating voltage range.
The reason why the second connector does not partially conform to the standard of RS-232C is that the connector having the shape conforming to the standard of RS-232C is used for the card due to the thickness limitation of the card type modem 10. This is because it is physically difficult to provide it in the type of modulation / demodulation device 10. Hereinafter, in this specification, the second connector 14 is referred to as “RS-2” for convenience.
32C '".

The terminal device 20 is used for communicating with another terminal device (not shown) via the modem 10.
The terminal device 20 has a general-purpose connector 15. The general-purpose connector 15 conforms to the standard of RS-232C.
For example, the general-purpose connector 15 is a plug-in connector having 25 pins, and is generally a 25-pin D-SUB.
It may be a connector called a connector.

The conversion device 5 has at least two connectors for connecting to an external device. One is a modulation / demodulation device connector 1 for connecting to a modulation / demodulation device 10, and the other is a terminal device connector 4 for connecting to a terminal device 20. The conversion device 5 includes the signal conversion circuit 2
And a power supply circuit 3. Signal conversion circuit 2
Are the connector 1 for the modem and the connector 4 for the terminal.
The signal input from the modem connector 1 is converted to be compatible with the terminal device 20 and output to the terminal device connector 4, and the signal input from the terminal device connector 4 is transmitted to the modem device 10. The signal is converted so as to be suitable and output to the modem connector 1. The power supply circuit 3
Power is supplied to the modem 10 via the modem connector 1.

The modem connector 1 is a modem 1
0 of the second connector 14. That is, the modem connector 1 is RS-2.
32C '. The terminal device connector 4 complies with the same standard as the standard of the general-purpose connector 15 of the terminal device 20. That is, the terminal device connector 4 complies with the standard of RS-232C. The modem connector 1 is electrically connected to the second connector 14 of the modem 10, and the terminal connector 4 is electrically connected to the general-purpose connector 15 of the terminal device 20.

FIG. 2 shows the shape and pin arrangement of a 25-pin D-SUB connector that can be used as the terminal device connector 4. In FIG. 2, the pins 21 and 22 are
They are used to transmit and receive signals indicating transmission data (SD) and reception data (RD), respectively. Pins 23 to 27 respectively indicate a transmission request (RS) and a transmission enabled (C
S), Data Set Ready (DR), Data Terminal Ready (ER), and Signaling Ground (SG).

FIG. 3 shows the shape of the connector and the pin arrangement which can be used as the connector 1 for the modem. For the reasons described above, this connector has a 25-pin DS
Although different from the shape of the UB connector, the pin arrangement of the connector is substantially the same as the pin arrangement of the 25-pin D-SUB connector. In FIG. 3, pins 31 and 32 are
They are used to transmit and receive signals indicating transmission data (SD) and reception data (RD), respectively. Pins 33 to 37 respectively indicate a transmission request (RS) and a transmission enable (C
S), Data Set Ready (DR), Data Terminal Ready (ER), and Signaling Ground (SG). Further, pins 38 and 39 are for power supply (VCC) and ground (GN), respectively.
D).

The signal input to the modem connector 1 is sent to a signal conversion circuit 2. The signal conversion circuit 2 converts the characteristics of the signal output from the second connector 14 of the modem 10 to match the characteristics of the signal that can be input to the terminal device 20. In this case, the characteristics of both signals are common except for the voltage level. Therefore, the signal conversion circuit 2
May convert the voltage level of a signal input to the modem connector 1 to a voltage level of a signal that can be input to the terminal device 20, and then output the converted signal to the terminal device connector 4. . Such voltage level conversion can be realized by a driver / receiver IC for RS-232C. For example, as the signal conversion circuit 2, a commercially available SN75188 manufactured by Texas Instruments may be used.

Further, the power supply circuit 3 supplies power to the modem 10 via the modem connector 1.
Specifically, when the modem connector 1 is the connector shown in FIG. 3, a voltage of 5 V is applied to the pin 38 of the modem connector 1. Such a power supply circuit 3 can be realized by, for example, a circuit called a DC-DC converter. Alternatively, the terminal device connector 4
Is a connector shown in FIG. 2, a 5 V voltage is applied to the pin 38 of the modem connector 1 by utilizing the fact that a voltage of 12 V is supplied to the pin 25 of the terminal device connector 4.
May be applied. That is, the power supply circuit 3 converts the 12 V voltage supplied to the pin 25 of the terminal device connector 4 into a 5 V voltage, and applies the converted voltage to the pin 38 of the modem connector 1. Is also good. As described above, since power is supplied to the modem 10 from outside the modem 10, the modem 1
There is no need to provide a power supply circuit inside 0. This contributes to space saving of the modem 10. In particular, when the modem 10 is a card-type modem, the portability of the modem is not impaired.

(Embodiment 2) FIG. 4 shows the configuration of another converter according to the present invention, together with a modem and a terminal connected to the converter. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The modem 10 'of FIG. 4 has the same components as the modem 10 of FIG. 1, except that the second connector 14 is omitted. The modem 10 'is a card-type modem.

The conversion device 5 'has at least two connectors for connecting to an external device. One is a modem connector 1 ′ for connecting to the modem 10 ′, and the other is a terminal connector 4 for connecting to the terminal 20. The conversion device 5 ′ further includes a signal conversion circuit 2 ′ and a power supply circuit 3. The signal conversion circuit 2 'is connected to the modem connector 1' and the terminal connector 4, and the modem connector 1 'is connected.
Is converted to be compatible with the terminal device 20 and output to the terminal device connector 4, and the signal input from the terminal device connector 4 is converted to be compatible with the modem 10 'to perform modulation and demodulation. Output to the device connector 1 '. The power supply circuit 3 supplies power to the modem 10 'via the modem connector 1'.

The modem connector 1 'conforms to the same standard as the standard of the first connector 11 of the modem 10'. That is, the modem connector 1 'conforms to the standard of JEIDA version 4.1 (PCMCIA release 2.0), which is a card-type dedicated interface. The terminal device connector 4 complies with the same standard as the standard of the general-purpose connector 15 of the terminal device 20. That is, the terminal device connector 4 is connected to the RS-2
It conforms to the standard of 32C. The modem connector 1 'is electrically connected to the first connector 11 of the modem 10', and the terminal connector 4 is electrically connected to the general-purpose connector 15 of the terminal device 20.

FIG. 5 shows the shape and pin arrangement of a connector that can be used as the connector 1 'for a modem. As shown in FIG. 5, this connector has # 1 to # 3
There are a total of 68 pins, 34 pins up to 4, and 34 pins # 35 to # 68 at the bottom. In this specification, each of the upper pins (# 1 to # 34) is referred to as a pin 501 to a pin 534, and each of the lower pins (# 35 to # 68) is referred to as a pin 535 to a pin 568.

Pins 529-522, pins 512-51
1, pin 508, pin 510, pin 521, pin 513
514, pins 520 to 519, pins 546 to 550,
And pins 553 to 556 are used to input signals indicating address bits (A0 to A25). These signals are collectively called an address bus.

Pins 530-532, pins 502-50
6, each of pins 564 to 566 and pins 537 to 541 are used to input and output signals indicating data bits (D0 to D15). These signals are collectively called a data bus.

Each of pin 561, pins 507 and 542, pin 545, pin 544, pin 560, pin 533, and pin 559 is attribute memory space select (-REG), card enable (-CE), I /
O write (-IOWR), I / O read (-IOR
D), input response (-INPACK), 16-bit I / O
Port (-IOIS16) and weight (-WAI
T) is used to input and output a signal indicating T). These signals are collectively called a control bus.

Each of the pins 517 and 551 is used as a power supply (VCC), and each of the pins 501, 534, 535 and 568 is used as a ground (GND).

FIG. 6 shows the configuration of the signal conversion circuit 2 '.
The signal conversion circuit 2 ′ includes a voltage conversion unit 61, an address control unit 62, a serial / parallel conversion unit 63, and a control signal control unit 64. The operation of the signal conversion circuit 2 'will be described with reference to FIG. Voltage converter 61 converts a voltage level. Such voltage level conversion is
It can be realized by a driver / receiver IC for RS-232C. For example, a commercially available SN75188 manufactured by Texas Instruments may be used as the signal conversion circuit 2 '.

The address control unit 62 has an address bus (A
0 to A25).

The serial / parallel converter 63 converts the signal transmission system. That is, a serial signal indicating transmission data (SD) input from the terminal connector 4 is converted into a parallel signal, and the converted signal is output to the modem connector 1 'as a data bus. Alternatively, a signal input in parallel as a data bus from the modem connector 1 'is converted into a serial signal,
The converted signal is output to the terminal connector 4 as received data (RD). Such serial / parallel conversion is performed by a UART (Universal Asynchronous Receiver Transcript).
smittrer). For example, as the serial / parallel converter 63, a commercially available CMOS-LSI IM6402 manufactured by Intersil can be used.

The control signal control section 64 controls the input / output timing of serial signals and parallel signals. Signals indicating the transmission request (RS), transmission enable (CS), data set ready (DR), and data terminal ready (ER) in the terminal connector 4 and the attribute memory space select ( -REG), card enable (-CE), I / O
Write (-IOWR), I / O read (-IORD),
The signal indicating the input response (-INPACK), the 16-bit I / O port (-IOIS16), and the signal indicating the wait (-WAIT) are mutually converted by the control signal control unit 64.

The power supply circuit 3 supplies power to the modem 10 'via the modem connector 1'. Specifically, when the modem 1 is the connector shown in FIG. 5, a voltage of 5 V is applied to the pins 517 and 551 of the modem 1 '. Such a power supply circuit 3 can be realized by, for example, a circuit called a DC-DC converter. Alternatively, when the terminal device connector 4 is the connector shown in FIG.
By utilizing the fact that a voltage of 12 V is supplied to the pin 25 of the terminal device connector 4, a voltage of 5 V may be applied to the pins 517 and 551 of the modem connector 1 ′. That is, the power supply circuit 3 converts the 12V voltage supplied to the pin 25 of the terminal device connector 4 into a 5V voltage, and supplies the converted voltage to the pins 517 and 551 of the modem connector 1 '. You may do so. As described above, since power is supplied to the modem 10 'from outside the modem 10', there is no need to provide a power supply circuit inside the modem 10 '. This means
This is useful for space saving of the modem 10 '. In particular, when the modem 10 'is a card-type modem, the portability of the modem is not impaired.

Note that the present invention is not limited to a specific interface. For example, using a protocol that is upward compatible with the standard instead of the protocol based on the interface standard described above, and using a connector that is upward compatible with the connector instead of the connector described above That is within the scope of the present invention. When the general-purpose connector 15 of the terminal device 20 is a connector conforming to the bus interface, the conversion device 5
Or, as a 5 ′ terminal device connector, RS-232C
Instead of the connector conforming to the standard, it is also possible to adopt a connector conforming to the standard of the bus interface.

Further, in the above-described embodiment, the card type modem is described as an example.
And 10 'are not limited to the card type modem. The present invention can be applied to any type of modem that follows an interface different from the general-purpose interface followed by the terminal device and has no space for installing a power supply.

Further, in the above embodiment, the terminal device 20 can be a personal computer. However, the present invention can be applied to terminal devices other than the personal computer.

[0041]

According to the present invention, it is possible to mutually connect a modem and a terminal device according to different interfaces. In particular, it becomes possible to connect a card-type modulation / demodulation device that follows a card-type dedicated interface to a terminal device that follows a general-purpose interface. Thus, it is not necessary to make a change that impairs portability of the card-type modulation / demodulation device, and the card-type modulation / demodulation device can be widely used together with a conventionally used terminal device.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a conversion device of the present invention.

FIG. 2 is a diagram showing a shape of a connector and an arrangement of pins that can be used as a terminal connector of the conversion device shown in FIG. 1;

FIG. 3 is a view showing a shape of a connector and an arrangement of pins that can be used as a connector for a modem of the converter shown in FIG. 1;

FIG. 4 is a diagram showing a configuration of another conversion device of the present invention.

FIG. 5 is a view showing a shape of a connector and an arrangement of pins which can be used as a connector for the modem of the converter shown in FIG. 4;

FIG. 6 is a diagram illustrating an example of a configuration of a signal conversion circuit illustrated in FIG. 4;

[Description of Signs] 1 Connector for modem device 2 Signal conversion circuit 3 Power supply circuit 4 Connector for terminal device 5 Conversion device

Continuation of front page (56) References JP-A-58-73262 (JP, A) JP-A-61-21668 (JP, A) JP-A-63-155314 (JP, A) JP-A-4-200039 (JP) JP-A-5-110628 (JP, A) JP-A-1-164692 (JP, U) JP-A-5-50855 (JP, U) JP-A-5-50857 (JP, U) 58-501154 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04M 11/00-11/10 H04L 29/10

Claims (5)

(57) [Claims] 1. A first connector according to a first interface .
According to the modem device and a second interface having a Kuta
Connectable to is <br/> is in a terminal device having a second connector, provided outside of said alteration demodulator and the terminal device
A conversion device that is electrically connectable to a first connector of the modulation and demodulation device.
Modulator and demodulator device core according to the first interface thus formed.
A connector, a second connector electrically connectable to structure the該該terminal
A terminal device connector according to the second interface formed.
Kuta and is connected to the modem connector and the connector for the terminal device, the terminal converts the signal input from the connector the modem to conform to the interface of the second
Output to end device connector, and signal converting means you output connector the modem converts the signal input from the connector the terminal device to conform to the first interface, the modem set to the outside of the converter through the use connectors
Conversion apparatus and a power supply means that to supply power to the displacement demodulator being eclipsed. 2. The conversion device according to claim 1, wherein the first interface is an interface dedicated to a card. 3. The first interface is a JEID.
The conversion device according to claim 2, which conforms to the standard of A. 4. The first interface according to claim 1, wherein said first interface is an RS-interface with respect to an electrical connection relationship and a signal input / output timing.
2. The converter according to claim 1, wherein the conversion device conforms to the 232C standard, and does not conform to the RS-232C standard with respect to the physical connector shape and the operating voltage range. 5. The method according to claim 1, wherein the second interface is RS-2.
The conversion device according to claim 1, wherein the conversion device conforms to a 32C standard.