CN207408937U - A kind of conversion circuit of TTL RS 232s interface level - Google Patents
A kind of conversion circuit of TTL RS 232s interface level Download PDFInfo
- Publication number
- CN207408937U CN207408937U CN201721650271.7U CN201721650271U CN207408937U CN 207408937 U CN207408937 U CN 207408937U CN 201721650271 U CN201721650271 U CN 201721650271U CN 207408937 U CN207408937 U CN 207408937U
- Authority
- CN
- China
- Prior art keywords
- resistance
- module
- connects
- connect
- conversion circuit
- 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.)
- Active
Links
Landscapes
- Amplifiers (AREA)
Abstract
The utility model is related to a kind of conversion circuits of TTL RS 232s interface level, including the first Wiring module, the input terminal of first Wiring module connects the output terminal of the first amplification module, the input terminal of first amplification module connects the output terminal of the second current limliting module, the input terminal of second current limliting module connects the output terminal of power supply module and the output terminal of the second Wiring module respectively, the output terminal of first Wiring module connects the input terminal of charging and voltage stabilizing module and the input terminal of the second amplification module respectively, the output terminal of second amplification module connects the output terminal of power supply module and the input terminal of the second Wiring module respectively, charging and voltage stabilizing module connects first amplification module by the first current limliting mould.It is at low cost with small, portable assembling, realize TTL RS 232 interface level conversion functions.
Description
Technical field
The utility model belongs to turn of interface export technique improvement areas more particularly to a kind of TTL RS 232s interface level
Change circuit.
Background technology
Many electronic products can easily pass through computer all with UART serial port functions by UART serial ports now
Debugging, tracking, monitoring interiors of products program operating condition.
Most products but all will be this biography using traditional DB9 interfaces with the RS232 serial ports connecting communications of computer
Interface volume of uniting is big, and occupied space, the cost is relatively high.In addition, the UART outputs of product are mostly Transistor-Transistor Logic level standards, high electricity
Flat 3.3V, low level 0V, and computer serial port is RS232 level standards, high level -5 to -12V, low level+5V to+12V, he
Level it is different, it is impossible to be directly connected to communicate, it is necessary to could connecting communication by level conversion IC or level shifting circuit.
RS232 interface volume is larger, is not suitable for present Super-minicomputer Ethernt E top box.CPU come out UART logic levels with
The standard serial port of computer etc. generally also needs to additional level conversion IC, could be connected by level conversion.
Utility model content
The purpose of this utility model is to provide a kind of conversion circuits of TTL RS 232s interface level, it is intended to solve above-mentioned
The technical issues of.
The utility model is realized in this way a kind of conversion circuit of TTL RS 232s interface level, the conversion circuit
Including the first Wiring module, charging and voltage stabilizing module, the first current limliting module, the second current limliting module, power supply module, the first amplification mould
Block, the second amplification module and the second Wiring module, the input terminal of first Wiring module connect first amplification module
Output terminal, the input terminal of first amplification module connect the output terminal of the second current limliting module, the second current limliting module
Input terminal connect the output terminal of the power supply module and the output terminal of the second Wiring module respectively, first Wiring module
Output terminal connects the input terminal of the charging and voltage stabilizing module and the input terminal of second amplification module, second amplification respectively
The output terminal of module connects the output terminal of the power supply module and the input terminal of the second Wiring module, the charging and voltage stabilizing mould respectively
Block connects first amplification module by the first current limliting mould.
The further technical solution of the utility model is：First amplification module include resistance R166, triode Q5 and
One end of resistance R139, the resistance R166 connect the collector of the triode Q5, the emitter difference of the triode Q5
It connects one end of the resistance R139 and the base stage of power supply 5V, the triode Q connects the other end of the resistance R139.
The further technical solution of the utility model is：Second amplification module includes resistance R138, resistance R103, three
Pole pipe Q8, resistance R184, resistance R169 and resistance R100, one end of the resistance R138 connect the one of the resistance R103 respectively
End and the base stage of triode Q8, the collector of the triode Q8 connect one end of the resistance R100, resistance R184 respectively
One end and one end of resistance R169, the other end connection power supply 5V of the resistance R100, the other end of the resistance R184, three poles
The emitter of pipe Q8 and the other end of resistance R103 are grounded respectively.
The further technical solution of the utility model is：The charging and voltage stabilizing module include diode D26, capacitance EC21 and
The anode of diode D28, the diode D26 connect the cathode of the capacitance EC21 and the anode of diode D28 respectively, described
The anode of capacitance EC21 and the cathode of diode D28 are grounded respectively.
The further technical solution of the utility model is：The first current limliting module includes resistance R168, the resistance
One end of R168 connects the anode of the anode of the diode D26, the cathode of capacitance EC21 and diode D28, the electricity respectively
The other end of resistance R168 connects one end of the resistance R166 and the collector of triode Q5 respectively.
The further technical solution of the utility model is：The second current limliting module includes resistance R167, the resistance
One end of R167 connects the other end of the resistance R139 and the base stage of triode Q5 respectively.
The further technical solution of the utility model is：The power supply module includes resistance R185 and resistance R181, described
One end of resistance R185 connects the other end of the resistance R167, and one end of the resistance R181 connects the another of the resistance R169
One end, the other end of the resistance R185 and the other end of resistance R181 connect power supply 3.3V respectively.
The further technical solution of the utility model is：First Wiring module includes wire connection terminal J18, the wiring
The first foot of terminal J18 connects the other end of the resistance R166, and the 2nd foot of the wire connection terminal J18 connects the electricity respectively
Hinder the other end of R138 and the cathode of diode D26, the 3rd foot ground connection of the wire connection terminal J18.
The further technical solution of the utility model is：Second Wiring module using three-in-one connection-peg,
1st core UART_TX of the connection-peg connects one end of the resistance R185 and the other end of resistance R167, the grafting respectively
2nd core UART_RX of head connects one end of the resistance R181 and the other end of resistance R169 respectively, and the 3rd of the connection-peg the
Core is grounded.
The beneficial effects of the utility model are：The circuit solves serial ports miniaturization to be adapted to present mini type machines top
Box without level conversion Ic, realizes that UART to standard RS232 level conversions, has with easy discrete first device of low cost
Small, portable assembling is at low cost, realizes TTL RS 232 interface level conversion functions.
Description of the drawings
Fig. 1 is the electrical schematic diagram of the conversion circuit for the TTL RS 232 interface levels that the utility model embodiment provides.
Specific embodiment
Fig. 1 shows the conversion circuit of TTL RS 232s interface level provided by the utility model, the conversion circuit bag
Include the first Wiring module, charging and voltage stabilizing module, the first current limliting module, the second current limliting module, power supply module, the first amplification module,
Second amplification module and the second Wiring module, the input terminal of first Wiring module connect the output of first amplification module
End, the input terminal of first amplification module connect the output terminal of the second current limliting module, the second current limliting module it is defeated
Enter end and connect the output terminal of the power supply module and the output terminal of the second Wiring module, the output of first Wiring module respectively
End connects the input terminal of the charging and voltage stabilizing module and the input terminal of second amplification module, second amplification module respectively
Output terminal connect the output terminal of the power supply module and the input terminal of the second Wiring module respectively, the charging and voltage stabilizing module is led to
It crosses the first current limliting mould and connects first amplification module.
First amplification module includes resistance R166, triode Q5 and one end of resistance R139, the resistance R166 connect
The collector of the triode Q5 is connect, the emitter of the triode Q5 connects one end and the power supply of the resistance R139 respectively
The base stage of 5V, the triode Q connect the other end of the resistance R139.
Second amplification module includes resistance R138, resistance R103, triode Q8, resistance R184, resistance R169 and electricity
R100 is hindered, one end of the resistance R138 connects one end of the resistance R103 and the base stage of triode Q8, three pole respectively
The collector of pipe Q8 connects one end of one end of the resistance R100, one end of resistance R184 and resistance R169, the electricity respectively
Hinder the other end connection power supply 5V of R100, the other end of the resistance R184, the emitter of triode Q8 and resistance R103 it is another
One end is grounded respectively.
The charging and voltage stabilizing module includes diode D26, capacitance EC21 and diode D28, the anode of the diode D26
The cathode of the capacitance EC21 and the anode of diode D28, the anode of the capacitance EC21 and the moon of diode D28 are connected respectively
Pole is grounded respectively.
One end that the first current limliting module includes resistance R168, the resistance R168 connects the diode D26 respectively
Anode, the cathode of capacitance EC21 and the anode of diode D28, the other end of the resistance R168 connects the resistance respectively
One end of R166 and the collector of triode Q5.
One end that the second current limliting module includes resistance R167, the resistance R167 connects the resistance R139's respectively
The base stage of the other end and triode Q5.
The power supply module includes resistance R185 and one end of resistance R181, the resistance R185 connect the resistance R167
The other end, one end of the resistance R181 connects the other end of the resistance R169, the other end and electricity of the resistance R185
The other end of resistance R181 connects power supply 3.3V respectively.
The first foot that first Wiring module includes wire connection terminal J18, the wire connection terminal J18 connects the resistance
The other end of R166, the 2nd foot of the wire connection terminal J18 connect the other end of the resistance R138 and diode D26 respectively
Cathode, the 3rd foot ground connection of the wire connection terminal J18.
Second Wiring module connects respectively using three-in-one connection-peg, the 1st core UART_TX of the connection-peg
One end of the resistance R185 and the other end of resistance R167 are connect, the 2nd core UART_RX of the connection-peg connects the electricity respectively
Hinder one end of R181 and the other end of resistance R169, the 3rd core tap ground of the connection-peg.
UART_TX first, the UART_TX come out from CPU after+3.3V is pulled up, after resistance R167 current limlitings, control Q5, when
When UART_TX is logically high, Q5 base stages are high level, and Q5 is in cut-off state at this time.Due to computer RS232_TX feet output-
12V voltages, this voltage flow to D26 by connecting line, then pass to EC21 charging and voltage stabilizings（Voltage cannot be mutated）, using R168
Current limliting is to Q5 collectors, that is to say, that when UART_TX for it is logically high when, the RX of RS232 is -12V logic levels；Work as UART_TX
For logic low when, Q5 base stages is low, and emitter connects+5V high level, and Q5 is in the conduction state at this time, Q5 current collections extremely+5V,
That is the RX of RS232 is+5V high logic levels at this time.It can be seen that the digital logic signal of UART_TX, can convert
For the digital logic signal of computer RS232_RX.
UART_RX is seen again, when being -12V from computer RS232_TX outputs, Q8 cut-off states, UART_RX level at this time
Depend on oneself in itself, there is+3.3V pull-up, so UART_RX is logically high；When computer RS232_TX outputs are+12V, Q8 is led
Logical state, current collection extremely ground level, so UART_RX at this time is logic low.It can be seen that the Digital Logic letter of RS232_TX
Number, the digital logic signal of UART_RX can also be transformed to.
In conclusion realize TTL RS 232 interface level conversion functions！
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (9)
1. a kind of conversion circuit of TTL RS 232s interface level, it is characterised in that：The conversion circuit includes the first wiring mould
Block, charging and voltage stabilizing module, the first current limliting module, the second current limliting module, power supply module, the first amplification module, the second amplification module
And second Wiring module, the input terminal of first Wiring module connect the output terminal of first amplification module, described first
The input terminal of amplification module connects the output terminal of the second current limliting module, and the input terminal of the second current limliting module connects respectively
The output terminal of the output terminal of the power supply module and the second Wiring module, the output terminal of first Wiring module connect institute respectively
State the input terminal of charging and voltage stabilizing module and the input terminal of second amplification module, the output terminal difference of second amplification module
The output terminal of the power supply module and the input terminal of the second Wiring module are connected, the charging and voltage stabilizing module is limited by described first
It flows mould and connects first amplification module.
2. conversion circuit according to claim 1, which is characterized in that first amplification module includes resistance R166, three
One end of pole pipe Q5 and resistance R139, the resistance R166 connect the collector of the triode Q5, the hair of the triode Q5
Emitter-base bandgap grading connects one end of the resistance R139 respectively and the base stage of power supply 5V, the triode Q connect the another of the resistance R139
One end.
3. conversion circuit according to claim 2, which is characterized in that second amplification module includes resistance R138, electricity
Resistance R103, triode Q8, resistance R184, resistance R169 and resistance R100, one end of the resistance R138 connect the electricity respectively
Hinder one end of R103 and the base stage of triode Q8, the collector of the triode Q8 connect respectively one end of the resistance R100,
One end of resistance R184 and one end of resistance R169, the other end connection power supply 5V of the resistance R100, the resistance R184's
The other end of the other end, the emitter of triode Q8 and resistance R103 is grounded respectively.
4. conversion circuit according to claim 3, which is characterized in that the charging and voltage stabilizing module includes diode D26, electricity
The anode for holding EC21 and diode D28, the diode D26 connects the cathode of the capacitance EC21 and diode D28 respectively
Anode, the anode of the capacitance EC21 and the cathode of diode D28 are grounded respectively.
5. conversion circuit according to claim 4, which is characterized in that the first current limliting module includes resistance R168, institute
The one end for stating resistance R168 connects the anode of the anode of the diode D26, the cathode of capacitance EC21 and diode D28 respectively,
The other end of the resistance R168 connects one end of the resistance R166 and the collector of triode Q5 respectively.
6. conversion circuit according to claim 5, which is characterized in that the second current limliting module includes resistance R167, institute
The one end for stating resistance R167 connects the other end of the resistance R139 and the base stage of triode Q5 respectively.
7. conversion circuit according to claim 6, which is characterized in that the power supply module includes resistance R185 and resistance
One end of R181, the resistance R185 connect the other end of the resistance R167, and one end of the resistance R181 connects the electricity
The other end of R169 is hindered, the other end of the resistance R185 and the other end of resistance R181 connect power supply 3.3V respectively.
8. conversion circuit according to claim 7, which is characterized in that first Wiring module includes wire connection terminal J18,
The first foot of the wire connection terminal J18 connects the other end of the resistance R166, and the 2nd foot of the wire connection terminal J18 connects respectively
Connect the other end of the resistance R138 and the cathode of diode D26, the 3rd foot ground connection of the wire connection terminal J18.
9. conversion circuit according to claim 8, which is characterized in that second Wiring module is using three-in-one
Connection-peg, the 1st core of the connection-peg connect one end of the resistance R185 and the other end of resistance R167, the grafting respectively
2nd core of head connects one end of the resistance R181 and the other end of resistance R169, the 3rd core ground connection of the connection-peg respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721650271.7U CN207408937U (en) | 2017-12-01 | 2017-12-01 | A kind of conversion circuit of TTL RS 232s interface level |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721650271.7U CN207408937U (en) | 2017-12-01 | 2017-12-01 | A kind of conversion circuit of TTL RS 232s interface level |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207408937U true CN207408937U (en) | 2018-05-25 |
Family
ID=62317293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721650271.7U Active CN207408937U (en) | 2017-12-01 | 2017-12-01 | A kind of conversion circuit of TTL RS 232s interface level |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207408937U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109117401A (en) * | 2018-09-04 | 2019-01-01 | 黔东南民族职业技术学院 | A kind of serial port level changer |
| CN114443535A (en) * | 2022-01-19 | 2022-05-06 | 苏州冠德能源科技有限公司 | Serial data communication port conversion circuit and conversion device |
-
2017
- 2017-12-01 CN CN201721650271.7U patent/CN207408937U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109117401A (en) * | 2018-09-04 | 2019-01-01 | 黔东南民族职业技术学院 | A kind of serial port level changer |
| CN114443535A (en) * | 2022-01-19 | 2022-05-06 | 苏州冠德能源科技有限公司 | Serial data communication port conversion circuit and conversion device |
| CN114443535B (en) * | 2022-01-19 | 2024-01-30 | 苏州冠德能源科技有限公司 | Serial data communication port conversion circuit and conversion device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207408937U (en) | A kind of conversion circuit of TTL RS 232s interface level | |
| CN102934351A (en) | Converting sub-circuit board of interface signals of electronically commutated motor | |
| CN204180045U (en) | Based on the serial port level chance-over circuit of the intellectual education terminal of Internet of Things | |
| CN102957415B (en) | Level converting method and level converting system | |
| CN205158342U (en) | HDMI interface multiplex circuit | |
| CN203661030U (en) | Electrical level switching circuit and circuit board having same | |
| CN204886919U (en) | Plain type logic level converting circuit structure | |
| CN208767808U (en) | A kind of USB2.0 and Type-C twoport charger circuit of intelligent recognition current limliting | |
| CN201927018U (en) | Automatic wire holder for 2<8N>/2 paths of household appliances capable of realizing output data management through interconnecting lines of serial port | |
| CN202914850U (en) | Modified proportional valve drive return circuit | |
| CN207069903U (en) | A kind of serial ports Transistor-Transistor Logic level and CMOS electrical level matching circuits | |
| CN201928255U (en) | Household electronic appliance automation wire holder with sending data line management by serial port | |
| CN204442341U (en) | Digital signal isolation module | |
| CN205319950U (en) | Computer power supply | |
| CN205283515U (en) | Adaptive pairs circuit | |
| CN203166863U (en) | Bidirectional electrical level conversion circuit and electronic product | |
| CN206759420U (en) | Bidirectional level conversion circuit | |
| CN202854803U (en) | Input/output (I/O) port expanded circuit of micro controller unit (MCU) | |
| CN203490695U (en) | Serial port switching circuit for computer | |
| CN202309675U (en) | Positive output and inverted output selection circuit based on 74HC14 chips | |
| CN209560530U (en) | Serial port level changer | |
| CN207037516U (en) | A kind of OTG functional circuits of automatic adaptation output current | |
| CN209690894U (en) | A kind of AB orthogonal signalling decision circuitry based on XOR gate | |
| CN206759104U (en) | The charging device of portable electric appts | |
| CN205910692U (en) | Support parallelly connected RS232 interface transmitting circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |