CA2004183A1 - Interface with an electrical supply and computer including such an interface - Google Patents
Interface with an electrical supply and computer including such an interfaceInfo
- Publication number
- CA2004183A1 CA2004183A1 CA002004183A CA2004183A CA2004183A1 CA 2004183 A1 CA2004183 A1 CA 2004183A1 CA 002004183 A CA002004183 A CA 002004183A CA 2004183 A CA2004183 A CA 2004183A CA 2004183 A1 CA2004183 A1 CA 2004183A1
- Authority
- CA
- Canada
- Prior art keywords
- interface
- computer
- disclosure
- connector
- electrical supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 230000003321 amplification Effects 0.000 claims abstract description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 4
- 230000002093 peripheral effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000000872 buffer Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/266—Arrangements to supply power to external peripherals either directly from the computer or under computer control, e.g. supply of power through the communication port, computer controlled power-strips
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Human Computer Interaction (AREA)
- Power Sources (AREA)
- Electrophonic Musical Instruments (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Optical Communication System (AREA)
- Amplifiers (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The disclosure pertains chiefly to an interface including an electrical supply. The disclosure concerns an interface capable of providing an external supply from the amplification of one of the signals. For example, the amplified DTR signal is used to give a supply voltage to a MIDI interface from an RS 232 serial interface using a nine-pin SUB D9M connector.
The disclosure can be applied to the making of interfaces capable of giving an electrical supply to an external device as well as to computers including such interfaces. The disclosure can be applied chiefly to the making of computers capable of working under the MS-DOS operating system and capable of providing a supply voltage to the MIDI interface by means of an RS
232 serial interface and a SUB D9M conector.
The disclosure pertains chiefly to an interface including an electrical supply. The disclosure concerns an interface capable of providing an external supply from the amplification of one of the signals. For example, the amplified DTR signal is used to give a supply voltage to a MIDI interface from an RS 232 serial interface using a nine-pin SUB D9M connector.
The disclosure can be applied to the making of interfaces capable of giving an electrical supply to an external device as well as to computers including such interfaces. The disclosure can be applied chiefly to the making of computers capable of working under the MS-DOS operating system and capable of providing a supply voltage to the MIDI interface by means of an RS
232 serial interface and a SUB D9M conector.
Description
INTERFAC~ WITH AN ELECTRIC~L SUPPLY AND
COMPUTER INCLUDING SUCH AN INTERFACE
BACKGROU~D OF THE INVE~TION
.. ... _ . _ _ _ 1. Field of the Invention ~ .. .....
The invention pertains to an interface with an electrical supply.
COMPUTER INCLUDING SUCH AN INTERFACE
BACKGROU~D OF THE INVE~TION
.. ... _ . _ _ _ 1. Field of the Invention ~ .. .....
The invention pertains to an interface with an electrical supply.
2. Description of the Prior Art The space occupied by electronic instruments can be reduced by taking advantage of the miniaturization of modern components. However, certain instruments such as, for ~xample, computers have to be ca~ble of communicating with the exterior by means of appropriate interfaces and connectors. Thus, the reduction of the number of pins of the connectors enables the space that it occupies to be reduc~d, but limits its possibilitles. For example, in serial links between compu ers, there has been a change ~rom a connector with 25 pin~ to a co~nector with 9 pins called SUB D9M.
Thi~ connector has a smaller space factor but all its pins are used. Thus it is no~: possible to add on, for example, a ~upply ~or an external peripheral. Thus, in prior art computers; it is not possible to use the serial link to connect an extern~l peripheral that has to be supplied with current, for example a peripheral such as a MIDI intexface designed for the driving of musical instruments. Now, it turns o~t that certain signals emitted by the serial link may, provided that , , , , .............. , : "
" , . ~ "
, `~
they are amplified, act as external electrical supplies inasmuch as their voltage remains constant for the stage during which the external peripheral needs to be supplied. For example, the signal called DTR or DTR
(Data Terminal Ready) is amplified to supply an external MIDI interface. The NIDI interface draws 5 volts from a voltage approximately equal to 12 volts given by the interface according to the present in~ention.
SUM~RY OF THE INVENTION
A main obje~t of the invention is an interface comprising means to amplify one of the signals so that it is possible to provide an electrical supply to an external device.
~nother object of the invention is an interface wherein an amplification means includes a transistor.
Another object of the invention is an interface wherein the transistor is of the NPN type.
Another ob~ect of the invention is an interface which is an RS 232 type serial interface.
Another object of the invention is an interface wherein the DTR (Data Texminal Ready~ signal of the RS
232 ssrial interface i used.
Another object o~ the invention is an inter~ace compri~ing a resistor parallel mounted with the transistor.
' ';
2~
~nother object of the invention is an interface compri~ing a nine-pin connector of the SUB D9M type.
Another object of the invention is a computer ~. .
including an interface.
Another object of the invention is a computer capable of working under the ~S-~OS operating system.
~nother ob~ect o~ the invention is a device including a NIDI interface and a computer wherein the NIDI interface i8 connected to the computer by means of the interface.
BRIEF DESCRIPTION OF ~HE DRAWINGS
The invention will be better understood from the ~ollowing description and from the appended ~igures, given as non-restrictive examples, wherein: ~:
- Figure 1 is a diagram of a device according to the present invention;
: - Figure 2 is a diagram of a particular exemplary embodiment of the device according to the present lnvention;
- Figure 3 is a diagram of a device according to the present invention. '~
DESCRIPTION OF A PREF ~RED EM~ODINENT
~igure 1 shows a digital instrument 22, for example a ~omputer having a connector 10. The connector 10 is connected to an interface 21. The connection~ may be for the communication o~ data, for example digital data, between the computer and the e~terior. On at ;~
",.: ~ ", .-"i"-, ~ : ",~, -;
least one of the contacts of the connector, there is an electrical supply obtained from ~he signal given by the intexface 21. ~he electrical supply is obtained by a~iplification by amplifiers 30 of the signals given by the inter~ace 21. The amplifiers 30 have to be capable of giving at least the current asked for by the external peripheral. However, it is possible to restrict the maximum current, for example to comply with standards.
It is clear that the invention is not restricted to computers, and that other de~ices having digital outputs such a~, for e~ample, digital synthesizers, digital optical disk readers and household appliances comprising the control interfaces do not go beyond the æ~ope o~ the present invention.
Figure 2 showss a particularly advantageous e~ample of the device according to the present invention, conc rning a serial interface and a male connector 10 o~ the SUB D9~ type. The serial interface inc1udes, for e~ample, an integrated circuit 11 marXeted by the firm N~TIONAL SEMICONDUCTOR under reference 8250, an output buffer 13, marketed by the firm NOTOROhA under reference 1488 and two input buffers 12 marketed by the firm MOTOROLA under reference 1489.
In the ex~mple shown i~ figure 2:
~0~
- the terminal 1 is connected through a circuit 12 to the RLSD signal of the circuit 11;
the terminal 2 is connected through the circuit 12 to the SIN signal of the circuit 11;
- the terminal 3 is connected through the circuit 13 to the ~OUT signal of the cirCUit 11;
- the terminal 4 is connected through the circuit 13 to the DT~ signal of the circuit 11;
- the terminal 5 is connected to the ground;
- the terminal 7 is connected through the circuit 12 to the DSR signal of the circuit 11;
- the terminal 7 is connected through the circuit 13 to the RTS signal of the circuit 11.
- the terminal 8 i~ connec1:ed through the circuit : 15 12 to the CTS signal of the circuit 11;
- the erminal g i5 connec1:ed through the circuit 12 to the RI signal of the circuit 11.
In the device according to the present invention~
it i8 imperative to determine a signal which, firstly, iæ llabl~ to give the desired s~pply voltage andl secondly, is not disturbed by the presence of the amplification device. In the example illustrated in figure 2, the DTR signal is used. In the RS 232 serial interface~, the DT~ signal is equal to more than 12 volts to indicate a logic level "1" and is equal to less than 12 volts to indicate a logic level "O".
i. ~ , ;
. ~ , . ..
2004~L~33 In the exemplary embedimen~ shown in figure 2, the output of the circuit 13 is connected firstly to the base of an NPN transistor 14 and, secondly, to the resistor 15. The resistor 15 is, for example, equal to 1000 o~s. The emitter of the transistor is connected to the terminal 4 of the connector 10. The collector of the transistor is connected to a + 12 volt~ supply.
During normal operation~ when the ~IDI interface is co~nected to the connector 10, the DTR signal is positive r the transis~or 14 conducts the current and thu~ enables the supplying of the MIDI interface. In normal use of the RS 232 ~erial interface, when the voltage o~ the DTR signal is equal to + 12 volts, this signal gets propagated to the terminal 4 without being modified by ~he transis~or 1~ of the resistor 15. On the other hand, when the DTR ~3ignal is equal to -12 volts, the transistor 14 is of:E and the signal passes by means of the resistor 15.
It 1~ thus seen that the serial interface behaves exactly as usual but that, if it is neces~ary, it further enables the provision of an electrical supply.
It i~, of course, possible to restrict the maximum current liable to be pu~ through by the serial in~erface ~or sa~ety reason or to comply with ~tandards. For example, it is possible to take a transistor that cannot put through a current o~ more -than 20 mA or to serially connect a resistor limiting the current.
If it is sought to give a negative current, advantageously a PNP ~ransistor will be used, with a -12 volts signal.
Figure 3 shows a computer 22 according to the present invention, connected by means of a MIDI
int2rface 30 to a synthesizer ~1 for example. The ~IDI
interface 30 is connected by means of the connector lO
of the R~ 232 interface 21 to the computer 22. Should he MIDI int~rface 30 re~uire a supply vol~age of 5 volts, it comprises, for example, a 5-volt Zener diode placed between the outputs 5 and the outputs 4 of the connector lO. In the device according to the invention, it is possible to connect a computer 22 through a serial interface 21 and a 9-pin connector of the SUB
- D9~ type to a MIDI interface 30. Thus, firstly there is a saving of a connector dedicated to the MIDI interface and, secondly, it is possibls to reduce the size of the connector 10 The invention can be applied to the making of intPrfaces capable of giving an electrical ~upply to an external device, as well as to computers having such interface~.
The invention can be applied chiefly to the making of computers capable of working under the MS-DOS
operating system and capable of giving a supply voltage ,,, ~` 2~ 3 to the MIDI interface by means O:e an RS 232 serial interf ace and a SUB D9M connector .
"
: ' .~ .
.
: ' :,, ~ : :
;:
, ~
~. , ~ .. .
Thi~ connector has a smaller space factor but all its pins are used. Thus it is no~: possible to add on, for example, a ~upply ~or an external peripheral. Thus, in prior art computers; it is not possible to use the serial link to connect an extern~l peripheral that has to be supplied with current, for example a peripheral such as a MIDI intexface designed for the driving of musical instruments. Now, it turns o~t that certain signals emitted by the serial link may, provided that , , , , .............. , : "
" , . ~ "
, `~
they are amplified, act as external electrical supplies inasmuch as their voltage remains constant for the stage during which the external peripheral needs to be supplied. For example, the signal called DTR or DTR
(Data Terminal Ready) is amplified to supply an external MIDI interface. The NIDI interface draws 5 volts from a voltage approximately equal to 12 volts given by the interface according to the present in~ention.
SUM~RY OF THE INVENTION
A main obje~t of the invention is an interface comprising means to amplify one of the signals so that it is possible to provide an electrical supply to an external device.
~nother object of the invention is an interface wherein an amplification means includes a transistor.
Another object of the invention is an interface wherein the transistor is of the NPN type.
Another ob~ect of the invention is an interface which is an RS 232 type serial interface.
Another object of the invention is an interface wherein the DTR (Data Texminal Ready~ signal of the RS
232 ssrial interface i used.
Another object o~ the invention is an inter~ace compri~ing a resistor parallel mounted with the transistor.
' ';
2~
~nother object of the invention is an interface compri~ing a nine-pin connector of the SUB D9M type.
Another object of the invention is a computer ~. .
including an interface.
Another object of the invention is a computer capable of working under the ~S-~OS operating system.
~nother ob~ect o~ the invention is a device including a NIDI interface and a computer wherein the NIDI interface i8 connected to the computer by means of the interface.
BRIEF DESCRIPTION OF ~HE DRAWINGS
The invention will be better understood from the ~ollowing description and from the appended ~igures, given as non-restrictive examples, wherein: ~:
- Figure 1 is a diagram of a device according to the present invention;
: - Figure 2 is a diagram of a particular exemplary embodiment of the device according to the present lnvention;
- Figure 3 is a diagram of a device according to the present invention. '~
DESCRIPTION OF A PREF ~RED EM~ODINENT
~igure 1 shows a digital instrument 22, for example a ~omputer having a connector 10. The connector 10 is connected to an interface 21. The connection~ may be for the communication o~ data, for example digital data, between the computer and the e~terior. On at ;~
",.: ~ ", .-"i"-, ~ : ",~, -;
least one of the contacts of the connector, there is an electrical supply obtained from ~he signal given by the intexface 21. ~he electrical supply is obtained by a~iplification by amplifiers 30 of the signals given by the inter~ace 21. The amplifiers 30 have to be capable of giving at least the current asked for by the external peripheral. However, it is possible to restrict the maximum current, for example to comply with standards.
It is clear that the invention is not restricted to computers, and that other de~ices having digital outputs such a~, for e~ample, digital synthesizers, digital optical disk readers and household appliances comprising the control interfaces do not go beyond the æ~ope o~ the present invention.
Figure 2 showss a particularly advantageous e~ample of the device according to the present invention, conc rning a serial interface and a male connector 10 o~ the SUB D9~ type. The serial interface inc1udes, for e~ample, an integrated circuit 11 marXeted by the firm N~TIONAL SEMICONDUCTOR under reference 8250, an output buffer 13, marketed by the firm NOTOROhA under reference 1488 and two input buffers 12 marketed by the firm MOTOROLA under reference 1489.
In the ex~mple shown i~ figure 2:
~0~
- the terminal 1 is connected through a circuit 12 to the RLSD signal of the circuit 11;
the terminal 2 is connected through the circuit 12 to the SIN signal of the circuit 11;
- the terminal 3 is connected through the circuit 13 to the ~OUT signal of the cirCUit 11;
- the terminal 4 is connected through the circuit 13 to the DT~ signal of the circuit 11;
- the terminal 5 is connected to the ground;
- the terminal 7 is connected through the circuit 12 to the DSR signal of the circuit 11;
- the terminal 7 is connected through the circuit 13 to the RTS signal of the circuit 11.
- the terminal 8 i~ connec1:ed through the circuit : 15 12 to the CTS signal of the circuit 11;
- the erminal g i5 connec1:ed through the circuit 12 to the RI signal of the circuit 11.
In the device according to the present invention~
it i8 imperative to determine a signal which, firstly, iæ llabl~ to give the desired s~pply voltage andl secondly, is not disturbed by the presence of the amplification device. In the example illustrated in figure 2, the DTR signal is used. In the RS 232 serial interface~, the DT~ signal is equal to more than 12 volts to indicate a logic level "1" and is equal to less than 12 volts to indicate a logic level "O".
i. ~ , ;
. ~ , . ..
2004~L~33 In the exemplary embedimen~ shown in figure 2, the output of the circuit 13 is connected firstly to the base of an NPN transistor 14 and, secondly, to the resistor 15. The resistor 15 is, for example, equal to 1000 o~s. The emitter of the transistor is connected to the terminal 4 of the connector 10. The collector of the transistor is connected to a + 12 volt~ supply.
During normal operation~ when the ~IDI interface is co~nected to the connector 10, the DTR signal is positive r the transis~or 14 conducts the current and thu~ enables the supplying of the MIDI interface. In normal use of the RS 232 ~erial interface, when the voltage o~ the DTR signal is equal to + 12 volts, this signal gets propagated to the terminal 4 without being modified by ~he transis~or 1~ of the resistor 15. On the other hand, when the DTR ~3ignal is equal to -12 volts, the transistor 14 is of:E and the signal passes by means of the resistor 15.
It 1~ thus seen that the serial interface behaves exactly as usual but that, if it is neces~ary, it further enables the provision of an electrical supply.
It i~, of course, possible to restrict the maximum current liable to be pu~ through by the serial in~erface ~or sa~ety reason or to comply with ~tandards. For example, it is possible to take a transistor that cannot put through a current o~ more -than 20 mA or to serially connect a resistor limiting the current.
If it is sought to give a negative current, advantageously a PNP ~ransistor will be used, with a -12 volts signal.
Figure 3 shows a computer 22 according to the present invention, connected by means of a MIDI
int2rface 30 to a synthesizer ~1 for example. The ~IDI
interface 30 is connected by means of the connector lO
of the R~ 232 interface 21 to the computer 22. Should he MIDI int~rface 30 re~uire a supply vol~age of 5 volts, it comprises, for example, a 5-volt Zener diode placed between the outputs 5 and the outputs 4 of the connector lO. In the device according to the invention, it is possible to connect a computer 22 through a serial interface 21 and a 9-pin connector of the SUB
- D9~ type to a MIDI interface 30. Thus, firstly there is a saving of a connector dedicated to the MIDI interface and, secondly, it is possibls to reduce the size of the connector 10 The invention can be applied to the making of intPrfaces capable of giving an electrical ~upply to an external device, as well as to computers having such interface~.
The invention can be applied chiefly to the making of computers capable of working under the MS-DOS
operating system and capable of giving a supply voltage ,,, ~` 2~ 3 to the MIDI interface by means O:e an RS 232 serial interf ace and a SUB D9M connector .
"
: ' .~ .
.
: ' :,, ~ : :
;:
, ~
~. , ~ .. .
Claims (10)
1. A computer interface comprising means to amplify one of the signals so that it is possible to provide an electrical supply to an external device.
2. An interface according to claim 1, wherein an amplification means includes a transistor.
3. An interface according to claim 2, wherein the transistor is of the NPN type.
4. An interface according to claim 1, wherein said interface is an RS 232 type serial interface.
5. An interface according to claim 4, wherein the DTR (Data Terminal Ready) signal of the RS 232 serial interface is used.
6. An interface according to claim 3, comprising a resistor parallel mounted with the transistor.
7. An interface according to claim 1, comprising a connector with nine connection pins, of the SUB D9M
type.
type.
8. A computer including an interface according to claim 1.
9. A computer according to claim 8, capable of working under the MS-DOS operating system.
10. A device including a MIDI interface and a computer wherein the MIDI interface is connected to the computer by means of the interface according to claim 1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8815667A FR2639715B1 (en) | 1988-11-30 | 1988-11-30 | INTERFACE WITH A POWER SUPPLY AND COMPUTER COMPRISING SUCH AN INTERFACE |
| FR8815667 | 1988-11-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2004183A1 true CA2004183A1 (en) | 1990-05-31 |
Family
ID=9372429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002004183A Abandoned CA2004183A1 (en) | 1988-11-30 | 1989-11-29 | Interface with an electrical supply and computer including such an interface |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0371857B1 (en) |
| KR (1) | KR0167334B1 (en) |
| AT (1) | ATE172307T1 (en) |
| CA (1) | CA2004183A1 (en) |
| DE (1) | DE68928833D1 (en) |
| FR (1) | FR2639715B1 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2456349A1 (en) * | 1979-05-07 | 1980-12-05 | Sitintel Inf Teletransm | Power supply for portable electronic processing machine - permits recharge of battery and contains circuit for data transfer |
| GB2154834B (en) * | 1984-02-23 | 1987-07-08 | Plessey Co Plc | A two wire dc power/signal transmission system |
| JPS61175729A (en) * | 1984-11-19 | 1986-08-07 | シユラムバ−ガ− テクノロジ− コ−ポレ−シヨン | Software protector |
-
1988
- 1988-11-30 FR FR8815667A patent/FR2639715B1/en not_active Expired - Fee Related
-
1989
- 1989-11-24 EP EP89403259A patent/EP0371857B1/en not_active Expired - Lifetime
- 1989-11-24 AT AT89403259T patent/ATE172307T1/en not_active IP Right Cessation
- 1989-11-24 DE DE68928833T patent/DE68928833D1/en not_active Expired - Lifetime
- 1989-11-29 KR KR1019890017371A patent/KR0167334B1/en not_active IP Right Cessation
- 1989-11-29 CA CA002004183A patent/CA2004183A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DE68928833D1 (en) | 1998-11-19 |
| ATE172307T1 (en) | 1998-10-15 |
| FR2639715A1 (en) | 1990-06-01 |
| KR0167334B1 (en) | 1999-02-18 |
| EP0371857A1 (en) | 1990-06-06 |
| KR900008367A (en) | 1990-06-04 |
| FR2639715B1 (en) | 1991-01-25 |
| EP0371857B1 (en) | 1998-10-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |