CN105488003A - Circuit structure and method for enhancing reliability of RS232 communication interface - Google Patents
Circuit structure and method for enhancing reliability of RS232 communication interface Download PDFInfo
- Publication number
- CN105488003A CN105488003A CN201510824657.4A CN201510824657A CN105488003A CN 105488003 A CN105488003 A CN 105488003A CN 201510824657 A CN201510824657 A CN 201510824657A CN 105488003 A CN105488003 A CN 105488003A
- Authority
- CN
- China
- Prior art keywords
- pin
- max3232 chip
- electric capacity
- circuit
- communication interface
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4063—Device-to-bus coupling
- G06F13/4068—Electrical coupling
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides a circuit structure and a method for enhancing the reliability of an RS232 communication interface. The circuit structure comprises a peripheral circuit connected to a MAX3232 chip and used for forming a charge pump circuit with the MAX3232 chip, an LED circuit connected to a T1IN pin and an R1OUT pin of the MAX3232 chip and used for providing instructions for receiving and transmitting states of bus data, and a protective circuit connected to a T1OUT pin and an R1IN pin of the MAX3232 chip. According to an RS232 communication circuit provided by the invention, the circuit protection performance is greatly improved and the circuit can realize a function of information transmission in a zero delay condition.
Description
Technical field
The present invention relates to telecommunication circuit field, particularly relate to a kind of circuit structure and the method that strengthen RS232 communication interface reliability.
Background technology
RS232 is one of communication interface on personal computer, the standard for serial communication that Bell System, modulator-demodular unit producer and terminal manufacturer formulate jointly is combined by Electronic Industries Association (ElectronicIndustriesAssociation, EIA).Usual RS-232 interface occurs with 9 pins (DB-9) or the kenel of 25 pins (DB-25), and the RS-232 mouth of Industry Control generally only uses RXD, TXD, GND tri-lines.
Because RS-232 has low price, programming is easy and can uses longer wire than other interface, make it in such as monitoring and controlling system, obtain general application.General RS232 telecommunication circuit only has simple data transmit-receive function and isolation features, and the protective value for circuit is strong, in addition, needs rapid reaction for some, and the communication even under zero-lag requirement, existing circuit cannot reach this requirement.
Summary of the invention
The shortcoming of prior art in view of the above; the object of the present invention is to provide a kind of circuit structure and the method that strengthen RS232 communication interface reliability, for solving the protective value reinforcement of existing RS232 telecommunication circuit and rapid reaction, even zero-lag cannot being needed to require the problem communicated.
For achieving the above object and other relevant objects, one aspect of the present invention provides a kind of circuit structure strengthening RS232 communication interface reliability, comprising:
Be connected to the peripheral circuit of MAX3232 chip, for forming charge pump circuit with described MAX3232 chip;
Be connected to the T1IN pin of described MAX3232 chip and the LED circuit of R1OUT pin, for providing instruction to the reiving/transmitting state of bus data;
Be connected to the T1OUT pin of described MAX3232 chip and the protection circuit of R1IN pin.
Preferably, described LED circuit comprises transistor, resistance and the light emitting diode that serial connection connects, the other end ground connection of described light emitting diode.
Preferably, described protection circuit comprises the current limiting safeguard resistor and transient voltage suppressor diode that are connected in series and connect and the RC network be connected to form by resistance and Capacitance parallel connection be connected in series with two described transient voltage suppressor diodes, described RC network ground connection.
Preferably, described peripheral circuit comprises the 3rd electric capacity between the first electric capacity between C1+ pin and C1-pin being connected to described MAX3232 chip, the C2+ pin being connected to described MAX3232 chip and C2-pin and is serially connected with the second electric capacity of V+ pin and the 4th electric capacity of described MAX3232 chip, the other end ground connection of described 4th electric capacity.
Preferably, the V-pin of described MAX3232 chip is connected with decoupling capacitance, the other end of described decoupling capacitance and described 4th electric capacity ground connection simultaneously.
The present invention additionally provides a kind of method strengthening RS232 communication interface reliability on the other hand, comprising:
There is provided MAX3232 chip, for described MAX3232 chip connects peripheral circuit to form charge pump circuit;
For the T1IN pin of described MAX3232 chip is connected LED circuit respectively with R1OUT pin, and by the T2IN pin ground connection of described MAX3232 chip; And
For the T1OUT pin of described MAX3232 chip is connected protection circuit respectively with R1IN pin.
Preferably, described LED circuit comprises transistor, resistance and the light emitting diode that serial connection connects, by the other end ground connection of described light emitting diode.
Preferably, for the T1OUT pin of described MAX3232 chip is connected protection circuit respectively with R1IN pin, comprising:
For T1OUT pin serial connection current limiting safeguard resistor and the transient voltage suppressor diode of described MAX3232 chip;
For R1IN pin serial connection current limiting safeguard resistor and the transient voltage suppressor diode of described MAX3232 chip;
Two described transient voltage suppressor diodes are connected and is connected in series the RC network be connected to form by resistance and Capacitance parallel connection, and by described RC network ground connection.
Preferably, for described MAX3232 chip connects peripheral circuit, comprising:
For connecting the first electric capacity between the C1+ pin of described MAX3232 chip and C1-pin;
For connecting the 3rd electric capacity between the C2+ pin of described MAX3232 chip and C2-pin;
V+ pin for described MAX3232 chip is connected in series the second electric capacity and the 4th electric capacity, by the other end ground connection of described 4th electric capacity.
Preferably in, also comprise:
For the V-pin of described MAX3232 chip connects decoupling capacitance;
By the other end of described decoupling capacitance and described 4th electric capacity ground connection simultaneously.
As mentioned above, a kind of circuit structure and method strengthening RS232 communication interface reliability of the present invention, has following beneficial effect:
RS232 telecommunication circuit provided by the invention, greatly strengthen the protective value of circuit, and this circuit can also realize the function that information is transmitted under zero-lag simultaneously.
Accompanying drawing explanation
Fig. 1 is shown as the circuit diagram that the present invention strengthens the circuit structure of RS232 communication interface reliability.
Fig. 2 is shown as the process flow diagram that the present invention strengthens the method for RS232 communication interface reliability.
Element numbers explanation
C1 ~ C6 electric capacity
R1 ~ R5 resistance
D1 ~ D2 light emitting diode
D3 ~ D4 transient voltage suppressor diode
VDD3_3V power supply
RS-232MAX3232 chip
S21 ~ S23 step
Embodiment
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art the content disclosed by this instructions can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by embodiments different in addition, and the every details in this instructions also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.It should be noted that, when not conflicting, the feature in following examples and embodiment can combine mutually.
It should be noted that, the diagram provided in following examples only illustrates basic conception of the present invention in a schematic way, then only the assembly relevant with the present invention is shown in graphic but not component count, shape and size when implementing according to reality is drawn, it is actual when implementing, and the kenel of each assembly, quantity and ratio can be a kind of change arbitrarily, and its assembly layout kenel also may be more complicated.
Refer to Fig. 1, the invention provides a kind of circuit structure and the method that strengthen RS232 communication interface reliability, for the protective value of intensifier circuit, realize the function that information is transmitted under zero-lag simultaneously.The present invention is by MAX3232 chip and peripheral circuit thereof, LED circuit and protection circuit composition, MAX3232 chip adopts proprietary low voltage difference transmitter output stage, dual charge pump is utilized to realize real RS232 performance when 3.0V to 5.5V Power supply, MAX3232 chip connects LED circuit for realizing the instruction to duty, MAX3232 chip connects protection circuit, for when abnormal signal, limiting input current, thus protection late-class circuit, available protecting late-class circuit exempts from electrostatic, thunderbolt, the various Electromagnetic Interference such as switching overvoltage, and protect bus.Below in conjunction with accompanying drawing the circuit structure of RS232 communication interface reliability is strengthened to the present invention and method is described.
As shown in Figure 1; the circuit structure that the present invention strengthens RS232 communication interface reliability comprises the peripheral circuit, LED circuit and the protection circuit that connect MAX3232 chip; MAX3232 chip adopts proprietary low voltage difference transmitter output stage; dual charge pump is utilized to realize real RS232 performance when 3.0V to 5.5V Power supply; MAX3232 chip and peripheral circuit form charge pump circuit, can provide+5.5V and-5.5V output voltage.The T1IN pin of MAX3232 chip connects the TXD pin of RS232 interface, and TXD pin is for sending signal, and the R1OUT pin of MAX3232 chip connects the RXD pin of RS232 interface, and RXD pin is used for Received signal strength.Be connected LED circuit at the T1IN pin of MAX3232 chip respectively with R1OUT pin place, provide instruction by the reiving/transmitting state of LED circuit to bus data, be convenient to observe and understand data interaction state.Be connected protection circuit at the T1OUT pin of MAX3232 chip respectively with R1IN pin, protect late-class circuit by protection circuit and bus is played a protective role.
Peripheral circuit comprises the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3 and the 4th electric capacity C4 that are connected with MAX3232 chip, and wherein the capacitance of the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3 and the 4th electric capacity C4 is 0.1uf.Particularly, the first electric capacity C1 is connected between the C1+ pin and C1-pin of MAX3232 chip, the 3rd electric capacity C3 is connected with C2-pin at the C2+ pin of MAX3232 chip, at the V+ pin serial connection connection second electric capacity C2 and the 4th electric capacity C4 of MAX3232 chip, by the other end ground connection of the 4th electric capacity C4.Connect VDD3_3V power supply at the VCC pin of MAX3232 chip, the other end of VDD3_3V power supply is connected between the second electric capacity C2 and the 4th electric capacity C4.MAX3232 chip and 4 outside 0.1uf electric capacity C1 to C4 form charge pump circuit, realize providing+5.5V and-5.5V output voltage.
Connect electric capacity C5 at the V-pin of MAX3232 chip, electric capacity C5 is decoupling capacitance, and the capacitance of electric capacity C5 is 0.1uf, the other end of this electric capacity C5 and the 4th electric capacity C4 ground connection simultaneously.The unusual waveforms eliminating power supply by electric capacity C5 and the pulse absorbing chip operation and produce.
LED circuit comprises transistor, resistance and the light emitting diode that serial connection connects, and the other end ground connection of light emitting diode.The high-speed cmos device of transistor to be 74HC14,74HC14 be a compatible TTL device pin, logic function is 6 Lu Simite trigger inverter, and its power consumption is low, and speed is fast.Particularly, transistor U2A, resistance R5 and light emitting diode D2 is connected in the T1IN pin serial connection of MAX3232 chip, the other end ground connection of this light emitting diode D2, transistor U2B, resistance R3 and light emitting diode D1 is connected, the other end of this light emitting diode D1 and light emitting diode D2 ground connection simultaneously in the R1OUT pin serial connection of MAX3232 chip.The instruction to duty is realized by light emitting diode D1 and D2.LED circuit realizes the instruction to bus data transmission and reception state, is convenient to observe and connection data interaction mode.By the T2IN pin of MAX3232 chip and DGNG pin ground connection simultaneously.
Protection circuit comprise serial connection connect current limiting safeguard resistor and transient voltage suppressor diode and be connected in series with two described transient voltage suppressor diodes be connected in parallel by resistance R4 and electric capacity C6 the RC network formed, the other end ground connection of this RC network.Particularly, at TIOUT pin contact resistance R1 and the transient voltage suppressor diode D3 of MAX3232 chip, the other end of transient voltage suppressor diode D3 connects resistance R4 in parallel and electric capacity C6, resistance R4 in parallel and electric capacity C6 forms RC network, the resistance R4 of this parallel connection and the other end ground connection of electric capacity C6.Be connected between transient voltage suppressor diode D3 and RC network at the R1IN pin contact resistance R2 of MAX3232 chip and the other end of transient voltage suppressor diode D4, transient voltage suppressor diode D4.Resistance R1 wherein and resistance R2 is current limiting safeguard resistor, can when abnormal signal, limiting input current, thus protection late-class circuit.Transient voltage suppressor diode D3 and D4, has fast response time, and transient absorption power is large, and the advantages such as volume is little, can exempt from the various Electromagnetic Interference such as electrostatic, thunderbolt, switching overvoltage by available protecting late-class circuit.Resistance R4 and electric capacity C6 forms RC network, realizes due to voltage spikes and can leak to the earth in time, thus play the effect of protection bus.The capacitance of electric capacity C6 is 1nf.
The circuit structure of enhancing RS232 communication interface reliability of the present invention realizes the instruction to bus data transmission and reception state jointly by transistor, resistance R3, resistance R5, light emitting diode D1 and light emitting diode D2.By current limiting safeguard resistor R1 and R2, protection late-class circuit.The various Electromagnetic Interference such as electrostatic, thunderbolt, switching overvoltage are exempted from by transient voltage suppressor diode D3 and D4 available protecting late-class circuit.By the RC network that resistance R4 and electric capacity C6 is formed, realize due to voltage spikes and can leak to the earth in time, thus play the effect of protection bus.RS232 telecommunication circuit provided by the invention, this circuit greatly strengthen the protective value of circuit, and this circuit can also realize the function that information is transmitted under zero-lag simultaneously.
Below the method that the present invention strengthens RS232 communication interface reliability is described.
As shown in Figure 2, the method that the present invention strengthens RS232 communication interface reliability comprises the steps:
Perform step S21, for MAX3232 chip connects peripheral circuit to form charge pump circuit.RS232 telecommunication circuit adopts MAX3232 chip, MAX3232 chip adopts proprietary low voltage difference transmitter output stage, utilize dual charge pump can realize real RS232 performance when 3.0V to 5.5V Power supply, MAX3232 chip and peripheral circuit composition charge pump circuit, can provide+5.5V and-5.5V output voltage.Comprise for MAX3232 chip connects peripheral circuit: for connecting the first electric capacity C1 between the C1+ pin of MAX3232 chip and C1-pin; For connecting the 3rd electric capacity C3 between the C2+ pin of MAX3232 chip and C2-pin; V+ pin for MAX3232 chip is connected in series the second electric capacity C2 and the 4th electric capacity C4, by the other end ground connection of the 4th electric capacity C4.The capacitance of the first electric capacity C1 wherein to the 4th electric capacity C4 is 0.1uf, MAX3232 chip and outside 4 0.1uf electric capacity composition charge pump circuit.For the VCC pin of MAX3232 chip connects VDD3_3V power supply, the other end of this VDD3_3V power supply is connected between the second electric capacity C2 and the 4th electric capacity C4.For the V-pin of MAX3232 chip connects electric capacity C5, this electric capacity C5 is decoupling capacitance, and by the other end of electric capacity C5 and the 4th electric capacity C4 ground connection simultaneously, the capacitance of electric capacity C5 is 0.1uf.The unusual waveforms eliminating supply voltage by electric capacity C5 and the pulse absorbing chip operation and produce.
Perform step S22, for MAX3232 chip connects LED circuit, for the T1IN pin of MAX3232 chip is connected LED circuit respectively with R1OUT pin, by the T2IN pin ground connection of MAX3232 chip, LED circuit comprises transistor, resistance and the light emitting diode that serial connection serial connection connects, by the other end ground connection of described light emitting diode.Particularly, transistor U2A, resistance R5 and light emitting diode D2 is connected in the T1IN pin serial connection of MAX3232 chip, the other end ground connection of this light emitting diode D2, transistor U2B, resistance R3 and light emitting diode D1 is connected, the other end of this light emitting diode D1 and light emitting diode D2 ground connection simultaneously in the R1OUT pin serial connection of MAX3232 chip.The instruction to duty is realized by light emitting diode D1 and D2.LED circuit realizes the instruction to bus data transmission and reception state, is convenient to observe and connection data interaction mode.By the T2IN pin of MAX3232 chip and DGNG pin ground connection simultaneously.
Perform step S23, for MAX3232 chip connects protection circuit, for the T1OUT pin of MAX3232 chip is connected protection circuit respectively with R1IN pin.Connect protection circuit to comprise: be T1OUT pin serial connection current limiting safeguard resistor and the transient voltage suppressor diode of MAX3232 chip; For R1IN pin serial connection current limiting safeguard resistor and the transient voltage suppressor diode of MAX3232 chip; Two transient voltage suppressor diodes are connected and is connected in series the RC network be connected to form by resistance and Capacitance parallel connection, and by the other end ground connection of RC network.Particularly, at TIOUT pin contact resistance R1 and the transient voltage suppressor diode D3 of MAX3232 chip, the other end of transient voltage suppressor diode D3 connects resistance R4 in parallel and electric capacity C6, resistance R4 in parallel and electric capacity C6 forms RC network, the resistance R4 of this parallel connection and the other end ground connection of electric capacity C6.Be connected between transient voltage suppressor diode D3 and RC network at the R1IN pin contact resistance R2 of MAX3232 chip and the other end of transient voltage suppressor diode D4, transient voltage suppressor diode D4.Resistance R1 wherein and resistance R2 is current limiting safeguard resistor, can when abnormal signal, limiting input current, thus protection late-class circuit.Transient voltage suppressor diode D3 and D4, has fast response time, and transient absorption power is large, and the advantages such as volume is little, can exempt from the various Electromagnetic Interference such as electrostatic, thunderbolt, switching overvoltage by available protecting late-class circuit.Resistance R4 and electric capacity C6 forms RC network, realizes due to voltage spikes and can leak to the earth in time, thus play the effect of protection bus.The capacitance of electric capacity C6 is 1nf.
In sum, the present invention strengthens circuit structure and the method for RS232 communication interface reliability, utilizes MAX3232 chip and the first electric capacity C1 to form charge pump circuit to the 4th electric capacity C4, can provide+5.5V and-5.5V output voltage; Utilize the unusual waveforms that decoupling capacitance C5 eliminates power supply and the pulse absorbing chip operation and produce; The instruction of LED circuit realization to duty is provided; Utilize protection circuit to protect late-class circuit, utilize transient voltage suppressor diode, have fast response time, transient absorption power is large, and the advantages such as volume is little, can exempt from the various Electromagnetic Interference such as electrostatic, thunderbolt and switching overvoltage by available protecting late-class circuit; Utilize RC network to realize due to voltage spikes and can leak to the earth in time, play the effect of protection bus.The invention provides RS232 telecommunication circuit, greatly strengthen the protective value of circuit, this circuit can also realize the function that information is transmitted under zero-lag simultaneously.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (10)
1. strengthen a circuit structure for RS232 communication interface reliability, it is characterized in that, comprising:
Be connected to the peripheral circuit of MAX3232 chip, for forming charge pump circuit with described MAX3232 chip;
Be connected to the T1IN pin of described MAX3232 chip and the LED circuit of R1OUT pin, for providing instruction to the reiving/transmitting state of bus data;
Be connected to the T1OUT pin of described MAX3232 chip and the protection circuit of R1IN pin.
2. the circuit structure strengthening RS232 communication interface reliability as claimed in claim 1, it is characterized in that, described LED circuit comprises the transistor, resistance and the light emitting diode that are connected in series, the other end ground connection of described light emitting diode.
3. the circuit structure strengthening RS232 communication interface reliability as claimed in claim 1 or 2; it is characterized in that; described protection circuit comprises the current limiting safeguard resistor and transient voltage suppressor diode that are connected in series and the RC network be connected to form by resistance and Capacitance parallel connection be connected in series with two described transient voltage suppressor diodes, described RC network ground connection.
4. the circuit structure strengthening RS232 communication interface reliability as claimed in claim 1, it is characterized in that, described peripheral circuit comprises the 3rd electric capacity between the first electric capacity between C1+ pin and C1-pin being connected to described MAX3232 chip, the C2+ pin being connected to described MAX3232 chip and C2-pin and is serially connected with the second electric capacity of V+ pin and the 4th electric capacity of described MAX3232 chip, the other end ground connection of described 4th electric capacity.
5. the circuit structure strengthening RS232 communication interface reliability as claimed in claim 4, it is characterized in that, the V-pin of described MAX3232 chip is connected with decoupling capacitance, the other end of described decoupling capacitance and described 4th electric capacity ground connection simultaneously.
6. strengthen a method for RS232 communication interface reliability, it is characterized in that, comprising:
There is provided MAX3232 chip, for described MAX3232 chip connects peripheral circuit to form charge pump circuit;
For the T1IN pin of described MAX3232 chip is connected LED circuit respectively with R1OUT pin, and by the T2IN pin ground connection of described MAX3232 chip; And
For the T1OUT pin of described MAX3232 chip is connected protection circuit respectively with R1IN pin.
7. the method strengthening RS232 communication interface reliability as claimed in claim 6, it is characterized in that, described LED circuit comprises the transistor, resistance and the light emitting diode that are connected in series, by the other end ground connection of described light emitting diode.
8. the method for enhancing RS232 communication interface reliability as claimed in claims 6 or 7, is characterized in that, for the T1OUT pin of described MAX3232 chip is connected protection circuit respectively with R1IN pin, comprising:
Current limiting safeguard resistor and transient voltage suppressor diode is connected at the T1OUT pin serial connection of described MAX3232 chip;
Current limiting safeguard resistor and transient voltage suppressor diode is connected at the R1IN pin serial connection of described MAX3232 chip;
Two described transient voltage suppressor diodes are connected and is connected in series the RC network be connected to form by resistance and Capacitance parallel connection, and by described RC network ground connection.
9. the method strengthening RS232 communication interface reliability as claimed in claim 6, is characterized in that, for described MAX3232 chip connects peripheral circuit, comprising:
The first electric capacity is connected between the C1+ pin and C1-pin of described MAX3232 chip;
The 3rd electric capacity is connected between the C2+ pin and C2-pin of described MAX3232 chip;
The second electric capacity and the 4th electric capacity is connected in series, by the other end ground connection of described 4th electric capacity at the V+ pin of described MAX3232 chip.
10. the method strengthening RS232 communication interface reliability as claimed in claim 9, is characterized in that, also comprise:
Decoupling capacitance is connected at the V-pin of described MAX3232 chip;
By the other end of described decoupling capacitance and described 4th electric capacity ground connection simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510824657.4A CN105488003A (en) | 2015-11-24 | 2015-11-24 | Circuit structure and method for enhancing reliability of RS232 communication interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510824657.4A CN105488003A (en) | 2015-11-24 | 2015-11-24 | Circuit structure and method for enhancing reliability of RS232 communication interface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105488003A true CN105488003A (en) | 2016-04-13 |
Family
ID=55674987
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510824657.4A Pending CN105488003A (en) | 2015-11-24 | 2015-11-24 | Circuit structure and method for enhancing reliability of RS232 communication interface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105488003A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU231313U1 (en) * | 2024-07-18 | 2025-01-23 | Общество с ограниченной ответственностью "Газпром трансгаз Ухта" | WEB CONSOLE DEVICE FOR RS-232 INTERFACE |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5321323A (en) * | 1990-12-14 | 1994-06-14 | Dallas Semiconductor Corporation | Surge limited low power transceiver circuit |
| CN1492302A (en) * | 2003-08-22 | 2004-04-28 | 艾默生网络能源有限公司 | Adaptive modem interface circuit and method |
| CN203012709U (en) * | 2012-12-26 | 2013-06-19 | 泉州豪杰信息科技发展有限公司 | Serial port debugging circuit between global position system (GPS) equipment and upper computer |
| CN104320594A (en) * | 2014-11-21 | 2015-01-28 | 连明昌 | Serial port matrix switcher based on FPGA |
| CN204256410U (en) * | 2014-12-18 | 2015-04-08 | 重庆多邦科技发展有限公司 | A kind of communication interface circuit and communication apparatus |
-
2015
- 2015-11-24 CN CN201510824657.4A patent/CN105488003A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5321323A (en) * | 1990-12-14 | 1994-06-14 | Dallas Semiconductor Corporation | Surge limited low power transceiver circuit |
| CN1492302A (en) * | 2003-08-22 | 2004-04-28 | 艾默生网络能源有限公司 | Adaptive modem interface circuit and method |
| CN203012709U (en) * | 2012-12-26 | 2013-06-19 | 泉州豪杰信息科技发展有限公司 | Serial port debugging circuit between global position system (GPS) equipment and upper computer |
| CN104320594A (en) * | 2014-11-21 | 2015-01-28 | 连明昌 | Serial port matrix switcher based on FPGA |
| CN204256410U (en) * | 2014-12-18 | 2015-04-08 | 重庆多邦科技发展有限公司 | A kind of communication interface circuit and communication apparatus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU231313U1 (en) * | 2024-07-18 | 2025-01-23 | Общество с ограниченной ответственностью "Газпром трансгаз Ухта" | WEB CONSOLE DEVICE FOR RS-232 INTERFACE |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101572642B (en) | RS485 communication circuit | |
| CN210804407U (en) | Serial port-to-single line communication module with level selection function | |
| CN105141491B (en) | RS485 communication circuit and method for realizing spontaneous self-receiving | |
| CN105488003A (en) | Circuit structure and method for enhancing reliability of RS232 communication interface | |
| CN206022885U (en) | A kind of control system of laser instrument | |
| CN103633985A (en) | RS485 communication circuit | |
| CN204576499U (en) | The electronic equipment of a kind of RS485 communicating circuit and application thereof | |
| CN204496490U (en) | The address card that a kind of upper pull-up voltage is adjustable | |
| CN104994040A (en) | Ethernet switch and port multiplexing method applied to Ethernet switch | |
| CN207853916U (en) | A kind of communication manager serial ports test device | |
| CN104571070A (en) | Modality-triggering excitation signal sending device based on PCI (peripheral component interconnect) bus | |
| CN103489302B (en) | A kind of signals collecting terminal and chamber data acquisition system (DAS) | |
| CN203675081U (en) | RS485 communication circuit | |
| CN1763621A (en) | USB-to-Optical Converter for Serial Communications | |
| CN209881799U (en) | Control circuit for autonomous controllable server | |
| CN107659476A (en) | Communication circuit | |
| CN203149572U (en) | EDA comprehensive experimental platform based on FPGA chip | |
| CN107170227B (en) | IR emission device and method | |
| CN207691822U (en) | Bi-directional digital communication system based on 4-20mA electric current loops | |
| CN109885517B (en) | Switching circuit and terminal equipment | |
| CN202998091U (en) | RS485 communication circuit | |
| CN220773447U (en) | CAN and 485 multiplexing communication protection circuit and energy storage system | |
| CN218958901U (en) | Isolation protection circuit of RS485 bus communication interface and electronic equipment | |
| CN202837858U (en) | Air conditioner controller development device | |
| CN119200885A (en) | Fully isolated touch screen USB interface circuit and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160413 |