CN202406019U - RS232 (Recommend Standard 232) serial communication electric larceny circuit - Google Patents
RS232 (Recommend Standard 232) serial communication electric larceny circuit Download PDFInfo
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- CN202406019U CN202406019U CN 201120511836 CN201120511836U CN202406019U CN 202406019 U CN202406019 U CN 202406019U CN 201120511836 CN201120511836 CN 201120511836 CN 201120511836 U CN201120511836 U CN 201120511836U CN 202406019 U CN202406019 U CN 202406019U
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- diode
- serial communication
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- hardware interface
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Abstract
The utility model provides an RS232 (Recommend Standard 232) serial communication electric larceny circuit which comprises a first diode and a second diode, wherein the anode of the first diode is connected with a request transmitting end of a hardware interface; the anode of the second diode is connected with a data terminal ready end of the hardware interface; the cathodes of the first diode and the second diode are both connected with the input end of a linear stabilizer; a first electrolytic capacitor is also connected between the cathodes of the first diode and the second diode and the ground in a jumper way; the output end of the linear stabilizer is connected with the power supply end of a level switch converting chip; and a second electrolytic capacitor and a capacitor are also connected between the output ends of the linear stabilizer and the ground in a jumper way. According to the RS232 (Recommend Standard 232) serial communication electric larceny circuit, an RS232 communication interface is utilized; of the supplied electricity for devices is obtained from the RS232 communication interface; a power supply is saved; and the RS232 (Recommend Standard 232) serial communication electric larceny circuit is convenient to use and the cost of the devices is reduced.
Description
Technical field
The utility model relates to power supply circuits, especially a kind of RS232 serial communication stealing circuit.
Background technology
In the equipment of the serial ports with RS232, the power consumption of tube apparatus is not greatly or little, all to equipment one group of independent power supply is provided, and in the equipment of low power consumption, the electric current that device just is several milliamperes provides power supply to make the equipment complex structure separately, and cost is higher.
The utility model content
To the problems referred to above, the utility model provides a kind of RS232 of utilization communication interface from communication interface, to obtain the power supply electric energy of equipment, has saved power supply, easy to use and RS232 serial communication stealing circuit that cost is low.
In order to solve the problems of the technologies described above; The utility model provides a kind of RS232 serial communication stealing circuit; It is characterized in that; Comprise first diode and second diode, the positive pole of said first diode connects the request transmitting terminal of hardware interface, and the positive pole of said second diode connects the just continuous end of data terminal of hardware interface; The negative pole of said first diode and second diode all is connected with the input of linear voltage regulator; Also cross-over connection has first electrochemical capacitor between the negative pole of first diode and second diode and ground, the power end of the output termination level transferring chip of said linear voltage regulator, and cross-over connection has second electrochemical capacitor and capacitor successively between the output of linear voltage regulator and ground.
The good effect of the utility model is: the utility model utilizes the RS232 communication interface, from the RS232 communication interface, obtains the power supply electric energy of equipment, has saved power supply, and is easy to use and reduced the cost of equipment.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model.
Embodiment
Below in conjunction with specific embodiment the utility model is done further explain.
As shown in Figure 1; A kind of RS232 serial communication stealing circuit; Comprise the first diode D1 and the second diode D2; The positive pole of the said first diode D1 meets the request transmitting terminal RTS of hardware interface DB9; The positive pole of the said second diode D2 meets the just continuous end DTR of data terminal of hardware interface DB9, and the negative pole of the said first diode D1 and the second diode D2 all is connected with the input of linear voltage regulator U2, between the negative pole of the first diode D1 and the second diode D2 and ground and cross-over connection has the first electrochemical capacitor C1; The output of said linear voltage regulator U2 is connected with the power end of level transferring chip U1, and cross-over connection has the second electrochemical capacitor C2 and capacitor C3 successively between the output of linear voltage regulator U2 and ground.
In the communication interface standard of RS232, more common hardware interface is only used 3 pin (for data transmission line) of hardware interface DB9,2 pin (for the Data Receiving line) of hardware interface DB9 and 5 pin (for ground wire GND) of hardware interface DB9.Other handshake line is not all used; Wherein the 7 pin request transmitting terminal RTS of just continuous end DTR of the 4 pin data terminals of hardware interface DB9 and hardware interface DB9 are the delivery outlet line of computer terminal; When all being set to high level to these two mouth lines; Every mouth line can provide the electric current of 5-10mA, and like Fig. 1, the size of current that A is ordered is 10-20mA.
When the computer configuration data terminal is high level with regard to the output voltage that continues end DTR, request transmitting terminal RTS bipod; Open circuit voltage is more than 7V; Linear voltage regulator U2 through the little power consumption of a slice is stabilized in 5V to voltage, and the first electrochemical capacitor C1 is used for eliminating the low-frequency voltage ripple of linear voltage regulator U2 input, and the second electrochemical capacitor C2 is used to eliminate the low-frequency voltage ripple of linear voltage regulator U2 output; Capacitor C3 is used to eliminate the high frequency voltage ripple of linear voltage regulator U2 output; As shown in Figure 1, at the stable electric current that 10mA is provided of B point ability, be the power supply of level transferring chip U1 and peripheral circuit thereof.
When the power supply of this equipment is flowed less than 10mA; Just continuous end DTR of the data terminal of hardware interface DB9 and request transmitting terminal RTS can provide the electric energy of equipment reliable work; The original supply power of the equipment that saves, the structure of simplified apparatus, easy to use and reduced production cost.
The foregoing description of the utility model only is to give an example for what explanation the utility model was done, and is not to be the qualification to the execution mode of the utility model.For the those of ordinary skill in affiliated field, on the basis of above-mentioned explanation, can also make other multi-form variation and changes.Here can't give exhaustive to all execution modes.Conspicuous variation that every technical scheme that belongs to the utility model is amplified out or change still are in the row of the protection range of the utility model.
Claims (1)
1. RS232 serial communication stealing circuit; It is characterized in that; Comprise first diode (D1) and second diode (D2); The positive pole of said first diode (D1) connects the request transmitting terminal (RTS) of hardware interface (DB9); The data terminal that the positive pole of said second diode (D2) connects hardware interface (DB9) is continuous end (DTR) just, and the negative pole of said first diode (D1) and second diode (D2) all is connected with the input of linear voltage regulator (U2), between the negative pole of first diode (D1) and second diode (D2) and ground and cross-over connection has first electrochemical capacitor (C1); The power end of the output termination level transferring chip (U1) of said linear voltage regulator (U2), cross-over connection has second electrochemical capacitor (C2) and capacitor (C3) successively between the output of linear voltage regulator (U2) and ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120511836 CN202406019U (en) | 2011-12-09 | 2011-12-09 | RS232 (Recommend Standard 232) serial communication electric larceny circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120511836 CN202406019U (en) | 2011-12-09 | 2011-12-09 | RS232 (Recommend Standard 232) serial communication electric larceny circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202406019U true CN202406019U (en) | 2012-08-29 |
Family
ID=46703635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120511836 Expired - Fee Related CN202406019U (en) | 2011-12-09 | 2011-12-09 | RS232 (Recommend Standard 232) serial communication electric larceny circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202406019U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106940685A (en) * | 2017-03-14 | 2017-07-11 | 浙江南都电源动力股份有限公司 | The power supply circuit of the passive transducers of RS232 485 |
-
2011
- 2011-12-09 CN CN 201120511836 patent/CN202406019U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106940685A (en) * | 2017-03-14 | 2017-07-11 | 浙江南都电源动力股份有限公司 | The power supply circuit of the passive transducers of RS232 485 |
| CN106940685B (en) * | 2017-03-14 | 2020-06-23 | 浙江南都电源动力股份有限公司 | Power supply circuit of RS232-485 passive converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120829 Termination date: 20121209 |