CN104850520B - A kind of USB multifunction converters and its conversion method - Google Patents
A kind of USB multifunction converters and its conversion method Download PDFInfo
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- 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
- G06F13/382—Information transfer, e.g. on bus using universal interface adapter
- G06F13/385—Information transfer, e.g. on bus using universal interface adapter for adaptation of a particular data processing system to different peripheral devices
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- G—PHYSICS
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- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
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Abstract
The present invention relates to a kind of USB multifunction converters, turn serial port circuit including USB, itself and signal fault-tolerant processing circuit both-way communication, signal fault-tolerant processing circuit with Phototube Coupling and each other repeat circuit respectively, infrared receiving/transmission circuit both-way communication, Phototube Coupling and each other repeat circuit respectively with RS485 circuits, infrared receiving/transmission circuit both-way communication, the Phototube Coupling and each other repeat circuit turn infrared circuit by RS485 and the infrared RS485 circuits that turn are constituted, the infrared receiving/transmission circuit is by infrared transmitting tube D16 and for receiving the infrared receiving circuit that the infrared receiving tube of outside infrared signal is constituted, the RS485 circuits and outside RS485 terminal both-way communications.The invention also discloses a kind of conversion method of new USB multifunction converters.The present invention is integrated with a converter turns serial ports multiple communication modes based on USB, that is USB turns serial ports, USB and turns RS485 communications, USB and turn infrared communication, RS485 to turn infrared communication and infrared turn RS485 communications totally 5 kinds of communication modes, it is more extensive using scope, and cost is relatively low.
Description
Technical field
The present invention relates to converter technology field, especially a kind of USB multifunction converters and its conversion method.
Background technology
At present, the converter of in the market only has a kind of function, such as USB turns serial ports, USB and turns RS485, USB turns remote red
It is outer etc., and a kind of communication modes can only be used.Communication interface between multiple product, different products is frequently encountered at work
Sometimes there was only RS485 communication interfaces, sometimes only Far-infrared communication interface, the two has concurrently sometimes, is so accomplished by different
Toggled between converter, the converter of simple function and communication modes can be adversely affected to operating efficiency.
The content of the invention
The primary and foremost purpose of the present invention is to provide a kind of cost low, and being integrated with USB on a converter turns serial ports, USB
Turn RS485, USB to turn infrared, RS485 and turn infrared, infrared many kinds of the RS485 that turns to change communication modes, at the same RS485 and it is infrared can
Complete the USB multifunction converters of adaptive communications.
To achieve the above object, present invention employs following technical scheme：A kind of USB multifunction converters, including with it is outer
USB interface connected USB in portion's turns serial port circuit, itself and signal fault-tolerant processing circuit both-way communication, signal fault-tolerant processing circuit point
Repeat circuit, infrared receiving/transmission circuit both-way communication not with Phototube Coupling and each other, Phototube Coupling and each other repeat circuit respectively with
RS485 circuits, infrared receiving/transmission circuit both-way communication, the Phototube Coupling and each other repeat circuit by RS485 turn infrared circuits and
Infrared to turn RS485 circuits composition, the infrared receiving/transmission circuit is by infrared transmitting tube D16 and by for receiving outside infrared signal
The infrared receiving circuit of infrared receiving tube composition, the RS485 circuits and outside RS485 terminal both-way communications.
Also include USB power source circuit, USB power source circuit point two-way is exported, and a road direction USB turns serial port circuit and powered, another
Road is powered by high withstand voltage electrical isolation power circuit to RS485 circuits；The USB turns the output end of serial port circuit and signal refers to
Show that the input of circuit is connected.
The signal fault-tolerant processing circuit include chip J1, chip J1 be 74HC08 chips or and gate circuit, its 1 pin difference
Anode, electric capacity C31 with double diode V7, resistance R63 one end are connected, electric capacity C31 other end ground connection, double diode V7's
Negative electrode receives RS485 and receives signal, and the resistance R63 other end is connected with double diode V7 negative electrode, the double diode V7 by
Diode V71 and diode V72 are composed in series, diode V71 anode as double diode V7 anode, diode V71's
Anode, the diode V72 negative electrode of negative electrode respectively with diode V72 are connected, and diode V72 negative electrode is used as duodiode V7's
Negative electrode；Anode of 2 pin of the chip J1 respectively with electric capacity C32, resistance R64 one end, double diode V8 is connected, electric capacity C32
Other end ground connection, double diode V8 negative electrode, which receives USB and turns the USB of serial port circuit transmission, to be turned serial ports and sends signal, resistance R64
The other end be connected with double diode V8 negative electrode, the double diode V8 is composed in series by diode V81 and diode V82,
Diode V81 anode is used as double diode V8 anode, diode V81 negative electrode anode respectively with diode V82, two poles
Pipe V82 negative electrode is connected, diode V82 negative electrode as duodiode V8 negative electrode；Chip J1 5 pin receive infrared receiving tube
The received IR signal of reception；Chip J1 6 pin are connected with resistance R39 one end, resistance the R39 other end and triode Q14
Base stage be connected, triode Q14 colelctor electrode is connected with resistance R65 one end, triode Q14 colelctor electrode export it is fault-tolerant after
Received IR signal turns RS485 circuits, triode Q14 emitter stage base to infrared.
The RS485, which turns infrared circuit, includes optocoupler U5, and it inputs the RS485 reception letters that termination RS485 circuits are received
Number, its output end is connected with double diode V9 negative electrode, the one end of double diode V9 anode respectively with resistance R73, resistance R45
It is connected, the resistance R73 other end is connected with triode Q8 base stage, triode Q8 colelctor electrode and triode Q9 emitter stage phase
Even, double diode V10 anode is connected with double diode V9 anode, and double diode V10 negative electrode receives USB and turns serial ports transmission
Signal, triode Q9 base stage is connected with resistance R74 one end, and the resistance R74 other end receives infrared carrier wave modulated signal, three
Pole pipe Q9 colelctor electrode is connected with infrared transmitting tube D16 anode, and infrared transmitting tube D16 negative electrode is grounded by resistance R75, institute
Double diode V9 is stated to be composed in series by diode V91 and diode V92, diode V92 anode as double diode V9 sun
Pole, anode, the diode V91 negative electrode of diode V92 negative electrode respectively with diode V91 is connected, and diode V91 negative electrode is made
For duodiode V9 negative electrode；The double diode V10 is composed in series by diode V101 and diode V102, diode V102
Anode be used as double diode V10 anode, anode, the diode V101 of diode V102 negative electrode respectively with diode V101
Negative electrode be connected, diode V101 negative electrode as duodiode V10 negative electrode.
The infrared RS485 circuits that turn include double diode V11, the output end phase of its negative electrode and signal fault-tolerant processing circuit
Even, its anode is connected with optocoupler U6 input, and optocoupler U6 output end is connected with the input of RS485 circuits, double diode
V12 anode is connected with double diode V11 anode, and double diode V12 negative electrode receives USB and turns serial ports transmission signal, described
Double diode V11 is composed in series by diode V111 and diode V112, and diode V112 anode is used as double diode V11's
Anode, anode, the diode V111 negative electrode of diode V112 negative electrode respectively with diode V111 is connected, diode V111's
Negative electrode as duodiode V11 negative electrode；The double diode V12 is composed in series by diode V121 and diode V122, and two
Pole pipe V122 anode is used as double diode V12 anode, diode V122 negative electrode anode respectively with diode V121, two
Pole pipe V121 negative electrode is connected, diode V121 negative electrode as duodiode V12 negative electrode.
The signal indicating circuit is made up of transmission indicator lamp, codan lamp and power supply indicator, and three is using hair
Optical diode.
Another object of the present invention is to provide a kind of conversion method of USB multifunction converters, this method includes：In hair
When sending data, USB turns serial port circuit and sends data to signal fault-tolerant processing circuit, is divided into two groups by signal fault-tolerant processing circuit
Data are sent, one group is sent to RS485 circuits by the infrared RS485 circuits that turn, realize that RS485 level is forwarded, another group of warp
RS485 turns infrared circuit and sent to infrared receiving/transmission circuit, completes infrared carrier wave signal modulation through infrared receiving/transmission circuit, realizes infrared
Signal is forwarded；
When receiving data, in RS485 communication process, if infrared receiving/transmission circuit receives infrared signal simultaneously, signal holds
Wrong process circuit carries out fault-tolerant processing to the RS485 signals received and the infrared signal received, masks received IR signal；
In infrared receiver data, when receiving infrared data, signal is held by signal fault-tolerant processing circuit
Mistake, completes IR signal reception；
When RS485 circuits receive external data, the data pass through while up-delivering signal fault-tolerant processing circuit
RS485 turns infrared circuit and is forwarded to infrared receiving/transmission circuit, completes the transmission of infrared signal；
When infrared transmission circuit receives data, the data are while up-delivering signal fault-tolerant processing circuit, by red
The outer RS485 circuits that turn are forwarded to RS485 circuits, complete the transmission of RS485 signals.
As shown from the above technical solution, the advantage of the invention is that：First, the present invention is integrated with base on a converter
In USB turn serial ports multiple communication modes, i.e. USB turn serial ports, USB turn RS485 communication, USB turn infrared communication, RS485 turn it is infrared
Communication and the infrared RS485 that turns communicate totally 5 kinds of communication modes, more extensive using scope, and cost is relatively low；Second, communication speed
At 1200 to 2400bps, can each other change, forward between RS485 communications and infrared communication, and RS485 and it is infrared can
Adaptive communications is completed, without switch switching, it becomes possible to automatic and external connection；3rd, power sourced electric isolation, the photoelectricity of communication
Isolation is effectively protected converter, protects the computer for providing USB interface.
Brief description of the drawings
Fig. 1 is circuit block diagram of the invention；
Fig. 2,3,4,5,6 for the present invention in signal fault-tolerant processing circuit, RS485 turn infrared circuit, it is infrared turn RS485 electricity
Road, infrared receiving circuit, the circuit theory diagrams of signal indicating circuit.
Embodiment
A kind of USB multifunction converters, including the USB being connected with external USB interface turn serial port circuit, and it is fault-tolerant with signal
Process circuit both-way communication, repeat circuit, infrared receiving/transmission circuit are double with Phototube Coupling and each other respectively for signal fault-tolerant processing circuit
To communication, Phototube Coupling and each other repeat circuit respectively with RS485 circuits, infrared receiving/transmission circuit both-way communication, the photoelectricity every
From and repeat circuit turns infrared circuits and the infrared RS485 circuits that turn by RS485 and constituted each other, the infrared receiving/transmission circuit is by infrared
Transmitting tube D16 and by for receiving the infrared receiving circuit that the infrared receiving tube of outside infrared signal is constituted, the RS485 circuits
With outside RS485 terminals both-way communication.Also include USB power source circuit, USB power source circuit point two-way output, a road direction USB turns string
Mouth circuit is powered, and another road is powered by high withstand voltage electrical isolation power circuit to RS485 circuits；The USB turns serial port circuit
Output end be connected with the input of signal indicating circuit.As shown in Figure 1.
As shown in figure 1, the power supply of RS485 circuits is due to consideration that influence in actual use thermally is, it is necessary to make
With insulating power supply, high withstand voltage electrical isolation power circuit has also reached effective protection computer while stabilized power source is provided
Effect, computer here refers to the computer for providing USB interface.
As shown in Fig. 2 the signal fault-tolerant processing circuit includes chip J1, chip J1 is 74HC08 chips or electric with door
Road, its 1 pin anode respectively with double diode V7, electric capacity C31, resistance R63 one end are connected, electric capacity C31 other end ground connection,
Double diode V7 negative electrode receives RS485 and receives signal, and the resistance R63 other end is connected with double diode V7 negative electrode, described
Double diode V7 is composed in series by diode V71 and diode V72, diode V71 anode as double diode V7 anode,
Anode, the diode V72 negative electrode of diode V71 negative electrode respectively with diode V72 are connected, diode V72 negative electrode conduct
Duodiode V7 negative electrode；2 pin of the chip J1 respectively with electric capacity C32, resistance R64 one end, double diode V8 anode
It is connected, electric capacity C32 other end ground connection, double diode V8 negative electrode, which receives USB and turns the USB of serial port circuit transmission, turns serial ports transmission
Signal, the resistance R64 other end is connected with double diode V8 negative electrode, and the double diode V8 is by diode V81 and diode
V82 is composed in series, diode V81 anode as double diode V8 anode, diode V81 negative electrode respectively with diode
V82 anode, diode V82 negative electrode are connected, diode V82 negative electrode as duodiode V8 negative electrode；Chip J1 5 pin
Receive the received IR signal that infrared receiving tube is received；Chip J1 6 pin are connected with resistance R39 one end, and resistance R39's is another
End is connected with triode Q14 base stage, and triode Q14 colelctor electrode is connected with resistance R65 one end, triode Q14 current collection
Received IR signal after pole output is fault-tolerant turns RS485 circuits, triode Q14 emitter stage base to infrared.Turn in processing USB
When serial ports sends the transmission of signal, signal fault-tolerant processing circuit does not work, i.e., without fault-tolerant；Receive RS485 signals and
During infrared signal, the work of signal fault-tolerant processing circuit；When only receiving infrared signal, the work of signal fault-tolerant processing circuit.
As shown in Fig. 2 RS485 receives signal RS485_RXD reaches chip J1, USB by resistance R63, duodiode V7
Turn serial ports and send signal TXD by resistance R64, duodiode V8 arrival chip J1, it is same that infrared receiving tube receives signal HW_RXD1
When reach the pin of chip J1 the 5th, chip J1 complete to receive RS485 signal RS485_RXD, USB turn serial ports send signal TXD,
Infrared receiving tube is received after signal HW_RXD1 three's signal fault-tolerant processing, by resistance R39, through triode Q14 outputs it is fault-tolerant after
Received IR signal HW_RXD.It can be seen that, signal, RS485 are sent to serial ports by signal fault-tolerant processing circuit and receive signal and red
The processing of the external collection of letters number, can be effectively ensured the signal cross-talk phenomenon between RS485, the transmitting-receiving of infrared circuit, while also avoiding
Occurs internal loopback phenomenon during infrared communication.
As shown in figure 3, the RS485, which turns infrared circuit, includes optocoupler U5, it inputs what termination RS485 circuits were received
RS485 receives signal, and its output end is connected with double diode V9 negative electrode, double diode V9 anode respectively with resistance R73, electricity
The one end for hindering R45 is connected, and the resistance R73 other end is connected with triode Q8 base stage, triode Q8 colelctor electrode and triode
Q9 emitter stage is connected, and double diode V10 anode is connected with double diode V9 anode, and double diode V10 negative electrode is received
USB turns serial ports and sends signal, and triode Q9 base stage is connected with resistance R74 one end, and the resistance R74 other end receives infrared load
Ripple modulated signal, triode Q9 colelctor electrode is connected with infrared transmitting tube D16 anode, and infrared transmitting tube D16 negative electrode passes through
Resistance R75 is grounded, and the double diode V9 is composed in series by diode V91 and diode V92, diode V92 anode conduct
Double diode V9 anode, anode, the diode V91 negative electrode of diode V92 negative electrode respectively with diode V91 is connected, and two
Pole pipe V91 negative electrode as duodiode V9 negative electrode；The double diode V10 is connected by diode V101 and diode V102
Composition, diode V102 anode is as double diode V10 anode, and diode V102 negative electrode is respectively with diode V101's
Anode, diode V101 negative electrode are connected, diode V101 negative electrode as duodiode V10 negative electrode.RS485 receives signal
RS485_RXD, after signal fault-tolerant processing processing of circuit, by double diode V9, resistance R73, reaches triode Q8, warp
After being superimposed with the triode Q9 38kHZ carrier signals reached, the carrier signal of modulation is passed through by infrared transmitting tube D16 infrared
Launch, complete infrared emission.
As shown in figure 4, the infrared RS485 circuits that turn include double diode V11, its negative electrode and signal fault-tolerant processing circuit
Output end be connected, its anode is connected with optocoupler U6 input, optocoupler U6 output end and the input phase of RS485 circuits
Even, double diode V12 anode is connected with double diode V11 anode, and double diode V12 negative electrode receives USB and turns serial ports hair
The number of delivering letters, the double diode V11 is composed in series by diode V111 and diode V112, and diode V112 anode is as double
Diode V11 anode, anode, the diode V111 negative electrode of diode V112 negative electrode respectively with diode V111 is connected,
Diode V111 negative electrode as duodiode V11 negative electrode；The double diode V12 is by diode V121 and diode V122
Be composed in series, diode V122 anode as double diode V12 anode, diode V122 negative electrode respectively with diode
V121 anode, diode V121 negative electrode are connected, diode V121 negative electrode as duodiode V12 negative electrode.Sending
During USB converter rs 232 serial interface signal, USB converter serial ports sends signal TXD through double diode V12, after U6 Phototube Couplings, turns
485_TXD is changed to, completing signal by RS485 circuit conversions sends；When receiving received IR signal HW_RXD, passing through
Fault-tolerant rear received IR signal HW_RXD is output as after signal fault-tolerant processing circuit, by double diode V11, V12, and through optocoupler
After U6 Phototube Couplings, be converted to 485_TXD and signal transmission is completed by RS485 circuits.
As shown in figure 5, infrared receiving tube receives infrared signal, by resistance R38, triode Q2 is reached, in resistance R47
Voltage signal as HW_RXD1 is obtained, the signal needs just be converted to infrared connect after signal fault-tolerant processing processing of circuit
The collection of letters number.
As shown in fig. 6, the signal indicating circuit is made up of transmission indicator lamp, codan lamp and power supply indicator, three
Person uses light emitting diode.Signal indicating circuit turns the carry out state instruction of receiving and sending messages of serial port circuit according to USB.
When sending data, USB turns serial port circuit and sends data to signal fault-tolerant processing circuit, and the data are without place
Reason, is transparent forwarding, is divided into two groups of transmission data by signal fault-tolerant processing circuit, one group turns RS485 circuits by infrared
Send to RS485 circuits, realize that RS485 level is forwarded, another group turns infrared circuit through RS485 and send to infrared receiving/transmission circuit,
Infrared carrier wave signal modulation is completed through infrared receiving/transmission circuit, realizes that infrared signal is forwarded；
When receiving data, the present invention is defaulted as RS485 preferentially, in RS485 communication process, if infrared receiving/transmission circuit is same
When receive infrared signal, signal fault-tolerant processing circuit carries out fault-tolerant processing to the RS485 signals received and the infrared signal received,
Received IR signal is masked, it is not in signal cross-talk in RS485 communication process so to ensure that circuit；
In infrared receiver data, because infrared sending tube and infrared receiving tube are installed together, in order to avoid occurring certainly
From phenomenon is received, when receiving infrared data, fault-tolerant, completion infrared signal is carried out to signal by signal fault-tolerant processing circuit
Receive；
When RS485 circuits receive external data, the data pass through while up-delivering signal fault-tolerant processing circuit
RS485 turns infrared circuit and is forwarded to infrared receiving/transmission circuit, completes the transmission of infrared signal；
When infrared transmission circuit receives data, the data are while up-delivering signal fault-tolerant processing circuit, by red
The outer RS485 circuits that turn are forwarded to RS485 circuits, complete the transmission of RS485 signals.
The present invention is integrated with turns serial ports multiple communication modes based on USB --- and USB turns serial ports, USB and turns RS485 communications, USB
Turn infrared communication, RS485 turn infrared communication and it is infrared turn RS485 communication；Communication speed is at 1200 to 2400bps, and RS485 leads to
It can each other change, forward between news and infrared communication；Power sourced electric isolation, the Phototube Coupling of communication effectively protect conversion
Device, protects computer.
USB-RS485 conversion：USB turns serial ports and sends signal by signal fault-tolerant processing circuit, is transmitted after Phototube Coupling
To RS485 circuits, RS485 circuits are to passing through overvoltage crowbar to RS485 terminals after signal transacting；RS485 circuits pass through mistake
Voltage protection circuit is received after RS485 terminal signalings, through Phototube Coupling be sent to signal fault-tolerant processing circuit it is fault-tolerant after to USB turn
Serial port circuit.
Conversion infrared USB-：USB is sent after signal is driven by triode with 38.0kHZ superpositions, passes through infrared emission
Pipe is transmitted into infrared terminal；After the infrared signal received in order to avoid transducer signal conflict, USB converter, infrared receiving tube,
Need fault-tolerant by the progress of signal fault-tolerant processing circuit（After fault-tolerant to RS485 receptions, infrared receiver, the transmission of USB serial ports）, reach
During condition of acceptance, data are received and USB is sent to.
Conversion infrared RS485-：Communication speed is at 1200 to 2400bps, and this converter directly can believe RS485
Number being converted to infrared signal is transmitted into infrared terminal；Infrared-RS485 conversion：Communication speed is at 1200 to 2400bps, originally
Infrared signal directly can be converted to RS485 signals and be transmitted into RS485 terminals by converter.
In summary, the present invention is integrated with a converter turns serial ports multiple communication modes, i.e. USB turns based on USB
Serial ports, USB turn RS485 communications, USB and turn infrared communication, RS485 to turn infrared communication and infrared turn RS485 communications totally 5 kinds of communication sides
Formula, it is more extensive using scope, and cost is relatively low；Communication speed is at 1200 to 2400bps, RS485 communications and infrared communication
Between can each other change, forward, and RS485 and it is infrared can complete adaptive communications, without switch switching, it becomes possible to automatic
And external connection；Power sourced electric isolation, the Phototube Coupling of communication are effectively protected converter, protect and provide USB interface
Computer.
Claims (6)
1. a kind of USB multifunction converters, it is characterised in that：USB including being connected with external USB interface turns serial port circuit, its
With signal fault-tolerant processing circuit both-way communication, signal fault-tolerant processing circuit with Phototube Coupling and each other repeat circuit, infrared respectively
Transmission circuit both-way communication, Phototube Coupling and each other repeat circuit respectively with RS485 circuits, infrared receiving/transmission circuit both-way communication,
The Phototube Coupling and each other repeat circuit turn infrared circuit by RS485 and the infrared RS485 circuits that turn are constituted, the infrared receiving/transmission
Circuit is by infrared transmitting tube D16 and by for receiving the infrared receiving circuit that the infrared receiving tube of outside infrared signal is constituted, institute
State RS485 circuits and outside RS485 terminal both-way communications；
The signal fault-tolerant processing circuit include chip J1, chip J1 be 74HC08 chips or and gate circuit, its 1 pin respectively with it is double
Diode V7 anode, electric capacity C31, resistance R63 one end are connected, electric capacity C31 other end ground connection, double diode V7 negative electrode
Receive RS485 and receive signal, the resistance R63 other end is connected with double diode V7 negative electrode, and the double diode V7 is by two poles
Pipe V71 and diode V72 are composed in series, and diode V71 anode is used as double diode V7 anode, diode V71 negative electrode
Anode, diode V72 negative electrode respectively with diode V72 is connected, diode V72 negative electrode as duodiode V7 the moon
Pole；Anode of 2 pin of the chip J1 respectively with electric capacity C32, resistance R64 one end, double diode V8 is connected, electric capacity C32's
The other end is grounded, and double diode V8 negative electrode, which receives USB and turns the USB of serial port circuit transmission, to be turned serial ports and send signal, resistance R64's
The other end is connected with double diode V8 negative electrode, and the double diode V8 is composed in series by diode V81 and diode V82, and two
Pole pipe V81 anode is used as double diode V8 anode, anode, the diode of diode V81 negative electrode respectively with diode V82
V82 negative electrode is connected, diode V82 negative electrode as duodiode V8 negative electrode；Chip J1 5 pin receive infrared receiving tube and connect
The received IR signal of receipts；Chip J1 6 pin are connected with resistance R39 one end, and the resistance R39 other end is with triode Q14's
Base stage is connected, and triode Q14 colelctor electrode is connected with resistance R65 one end, red after triode Q14 colelctor electrode output is fault-tolerant
The external collection of letters number turns RS485 circuits, triode Q14 grounded emitter to infrared.
2. USB multifunction converters according to claim 1, it is characterised in that：Also include USB power source circuit, USB power source
Circuit point two-way output, a road direction USB turns serial port circuit and powered, another road by high withstand voltage electrical isolation power circuit to
RS485 circuits are powered；The USB turns the output end of serial port circuit and is connected with the input of signal indicating circuit.
3. USB multifunction converters according to claim 1, it is characterised in that：The RS485, which turns infrared circuit, includes light
Coupling U5, it inputs the RS485 reception signals that termination RS485 circuits are received, and its output end is connected with double diode V9 negative electrode,
The one end of double diode V9 anode respectively with resistance R73, resistance R45 is connected, the resistance R73 other end and triode Q8 base
Extremely it is connected, triode Q8 colelctor electrode is connected with triode Q9 emitter stage, double diode V10 anode is with double diode V9's
Anode is connected, and double diode V10 negative electrode receives USB and turns serial ports transmission signal, triode Q9 base stage and resistance R74 one end
It is connected, the resistance R74 other end receives infrared carrier wave modulated signal, triode Q9 colelctor electrode and infrared transmitting tube D16 sun
Extremely it is connected, infrared transmitting tube D16 negative electrode is grounded by resistance R75,
The double diode V9 is composed in series by diode V91 and diode V92, and diode V92 anode is used as double diode
V9 anode, anode, the diode V91 negative electrode of diode V92 negative electrode respectively with diode V91 is connected, diode V91's
Negative electrode as duodiode V9 negative electrode；The double diode V10 is composed in series by diode V101 and diode V102, two poles
Pipe V102 anode is used as double diode V10 anode, diode V102 negative electrode anode respectively with diode V101, two poles
Pipe V101 negative electrode is connected, diode V101 negative electrode as duodiode V10 negative electrode.
4. USB multifunction converters according to claim 1, it is characterised in that：The infrared RS485 circuits that turn are including double
Diode V11, its negative electrode is connected with the output end of signal fault-tolerant processing circuit, and its anode is connected with optocoupler U6 input, light
Coupling U6 output end is connected with the input of RS485 circuits, and double diode V12 anode is connected with double diode V11 anode,
Double diode V12 negative electrode receives USB and turns serial ports transmission signal, and the double diode V11 is by diode V111 and diode
V112 is composed in series, diode V112 anode as double diode V11 anode, diode V112 negative electrode respectively with two poles
Pipe V111 anode, diode V111 negative electrode are connected, diode V111 negative electrode as duodiode V11 negative electrode；It is described
Double diode V12 is composed in series by diode V121 and diode V122, and diode V122 anode is used as double diode V12's
Anode, anode, the diode V121 negative electrode of diode V122 negative electrode respectively with diode V121 is connected, diode V121's
Negative electrode as duodiode V12 negative electrode.
5. USB multifunction converters according to claim 2, it is characterised in that：The signal indicating circuit is referred to by sending
Show lamp, codan lamp and power supply indicator composition, three uses light emitting diode.
6. the conversion method of USB multifunction converters according to claim 1, this method includes：
When sending data, USB turns serial port circuit and sends data to signal fault-tolerant processing circuit, passes through signal fault-tolerant processing circuit
It is divided into two groups of transmission data, one group is sent to RS485 circuits by the infrared RS485 circuits that turn, realizes that RS485 level is forwarded,
Another group turns infrared circuit through RS485 and sends to infrared receiving/transmission circuit, and infrared carrier wave signal modulation is completed through infrared receiving/transmission circuit,
Realize that infrared signal is forwarded；
When receiving data, in RS485 communication process, if infrared receiving/transmission circuit receives infrared signal, the fault-tolerant place of signal simultaneously
Reason circuit carries out fault-tolerant processing to the RS485 signals received and the infrared signal received, masks received IR signal；
It is fault-tolerant to signal progress by signal fault-tolerant processing circuit when receiving infrared data in infrared receiver data, it is complete
Into IR signal reception；
When RS485 circuits receive external data, the data pass through RS485 while up-delivering signal fault-tolerant processing circuit
Turn infrared circuit and be forwarded to infrared receiving/transmission circuit, complete the transmission of infrared signal；
When infrared transmission circuit receives data, the data pass through infrared turn while up-delivering signal fault-tolerant processing circuit
RS485 circuits are forwarded to RS485 circuits, complete the transmission of RS485 signals.
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| CN106056895B (en) * | 2016-07-21 | 2021-11-16 | 国家电网公司 | 485-to-infrared circuit and data transmission method |
| CN106253984B (en) * | 2016-07-28 | 2018-07-13 | 长沙威胜信息技术有限公司 | Optical fiber-RS485 chromacoders |
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