CN208834295U - A kind of 232 and 485 Bus isolation conversion modules - Google Patents
A kind of 232 and 485 Bus isolation conversion modules Download PDFInfo
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- CN208834295U CN208834295U CN201821588041.7U CN201821588041U CN208834295U CN 208834295 U CN208834295 U CN 208834295U CN 201821588041 U CN201821588041 U CN 201821588041U CN 208834295 U CN208834295 U CN 208834295U
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Abstract
The utility model discloses a kind of 232 and 485 Bus isolation conversion modules, including power supply power supply unit, 232 interface units, 485 interface units, isolation transmission unit, 232 level and Transistor-Transistor Logic level conversion are carried out by using single supply electrical level transferring chip MAX232ESE+, 485 differential signals and Transistor-Transistor Logic level conversion are carried out using half-duplex transceiving chip MAX3082, have many advantages, such as that data transmission bauds is fast, stability is high, transmission range is long, simultaneously using wide scope weak mains as input, high safety, flexibility is high, adjustability is strong.
Description
Technical field
The utility model relates to industrial communication fields, and in particular to one kind, which can be isolated, completes 232 bus datas and 485 buses
The mutual conversion module of data-signal.
Background technique
In modern industry field, most of industrial control equipments are no longer " fighting a lone battle ", can all realize that data are transmitted,
So that the operating status of equipment is uploaded background monitoring room in time, operator on duty can understand the operating status of equipment, and root at any time
The control or daily maintenance of equipment are carried out according to actual conditions.
RS485 communication interface more common in industrial communication network at present, since it is with good noise immunity,
The advantages that long transmission range and multistation ability, become one of network data transmission the most common form.Then there are also very
Institute is earliest serial communication interface RS232 with communication interface inside the equipment of more producers production, therefore equipment is in data upload
Backstage before or after the receipt number of units according to after, it is necessary to the conversion between two kinds of communication buses is completed, to successfully complete equipment
It is transmitted with the data of background monitoring.
In conclusion needing to increase a kind of bus converter between two kinds of interfaces of RS232 and RS485.Currently on the market
RS232 and RS485 converter, bus signals, power supply signal be simultaneously not isolated from, and data transmission is unstable, if RS485 bus is in length
When stronger by external disturbance during Distance Transmission, Yi Fasheng error code, the situation losing code or even not communicating, signal conversion are paid no attention to
Think.Therefore how the mutual conversion between the RS485 signal and RS232 signal in reliable and stable completion transmission process, be mesh
Preceding problem to be solved.
Utility model content
To solve the above problems, the utility model provides a kind of 232 and 485 Bus isolation conversion modules, including power supply
Power supply unit, 232 interface units, 485 interface units, isolation transmission unit, wherein power supply power supply unit respectively with 232 interface lists
Member, 485 interface units, isolation transmission unit connection, give latter three power supply, isolation transmission unit respectively with 232 interface units and
The connection of 485 interface units, when 232 interface units are in transmission state, externally input 232 level signal passes through 232 interfaces
Cell translation, then by isolation transmission unit to 485 interface units, will be isolated at Transistor-Transistor Logic level signal by 485 interface units
Transistor-Transistor Logic level signal afterwards is converted to 485 differential signal level, and is externally exported, and realizes turning for 232 buses to 485 buses
It changes；When 485 interface units are in transmission state, 485 differential signal is converted to Transistor-Transistor Logic level signal by 485 interface units, warp
It crosses isolation transmission unit and sends 232 interface units to, and be converted into the output of 232 level, realize turning for 485 buses to 232 buses
It changes.
Further, power supply power supply unit includes the first connecting terminal, the first fuse, power supply first diode, power supply
First electrolytic capacitor, the second electrolytic capacitor of power supply, power supply third electrolytic capacitor, the first ceramic disc capacitor of power supply, the second tile of power supply
Capacitor, power supply third ceramic disc capacitor, power supply the 4th ceramic disc capacitor, the first power supply chip, second source chip, wherein first connects
One end of line terminals is successively connected with the anode sequence of the first fuse, first diode of powering, the yin for first diode of powering
Pole respectively with the anode of the first electrolytic capacitor of power supply, the one end of the first ceramic disc capacitor of powering, the first power supply chip input terminal phase
Even, the output end of the first power supply chip respectively with power supply the second electrolytic capacitor anode, power the second ceramic disc capacitor one end, supply
One end of electric third ceramic disc capacitor is connected with the input terminal of second source chip, forms first via power supply；Second source chip
Output end is connected with one end of the anode of power supply third electrolytic capacitor, the 4th ceramic disc capacitor of powering respectively, forms the second road power supply；
The other end of first connecting terminal, the cathode for the first electrolytic capacitor of powering, the first ceramic disc capacitor of powering the other end,
First power supply chip lower margin, the cathode for the second electrolytic capacitor of powering, the other end for the second ceramic disc capacitor of powering, power supply third tile
The input of the other end, second source chip of capacitor it is connected, forms first via power ground；The output ground of second source chip point
It is not connected with the other end of the cathode of power supply third electrolytic capacitor, the 4th ceramic disc capacitor of powering, forms the second tunnel power ground.
Further, isolation transmission unit includes first resistor, the first triode, second resistance, the first isolation optocoupler, the
Three resistance, the first ceramic disc capacitor, the second ceramic disc capacitor；4th resistance, the 5th resistance, the second triode, the 6th resistance, the first hair
Optical diode, the second isolation optocoupler, the 7th resistance, third ceramic disc capacitor, the 4th ceramic disc capacitor；8th resistance, the 9th resistance, the
Three triodes, the tenth resistance, the second light emitting diode, third isolation optocoupler, eleventh resistor, the 5th ceramic disc capacitor, the 6th porcelain
Chip capacitor；Wherein, the first isolation optocoupler is used for the control signal of isolated data transmission, and the second isolation optocoupler is passed for isolated data
Defeated transmission signal, third isolation optocoupler are used for the reception signal of isolated data transmission；
Control signal successively with first resistor, the base stage of the first triode sequence be connected, the emitter of the first triode and
First via power supply is connected, and collector is successively connected with second resistance, the anode sequence of the first isolation optocoupler primary side, the first isolation
The cathode of optocoupler primary side is connected with first via power ground, constitutes the driving circuit of the first isolation optocoupler；First isolation optocoupler pair side
Output pin be connected respectively with one end of one end of 3rd resistor, the second ceramic disc capacitor, constitute the first isolation optocoupler output electricity
Road, while the output pin on the first isolation optocoupler pair side outputs signals to 485 interface units；The power supply on the first isolation optocoupler pair side supplies
Electric foot, the other end of 3rd resistor, the first ceramic disc capacitor one end be connected respectively with the second road power supply, the first ceramic disc capacitor it is another
One end is connected with the second tunnel power ground；The power ground pin on the first isolation optocoupler pair side, the second ceramic disc capacitor the other end respectively with
Second tunnel power ground is connected；
It sends signal to be connected with one end of one end of the 4th resistance, the 5th resistance respectively, the other end of the 5th resistance and the
The base stage sequence of two triodes is connected, and the collector of the second triode is sequentially connected the 6th resistance, the second isolation optocoupler primary side
The other end of anode, emitter and the 4th resistance is connected with first via power supply respectively, the cathode of the second isolation optocoupler primary side with
First via power ground is connected, and constitutes the driving circuit of the second isolation optocoupler；The output pin on the second isolation optocoupler pair side is respectively with
One end of seven resistance, one end of the 4th ceramic disc capacitor are connected, constitute the output circuit of the second isolation optocoupler, while the second isolation light
The output pin on coupling pair side outputs signals to 485 interface units；The power supply power supply foot on the second isolation optocoupler pair side, the 7th resistance it is another
One end, third ceramic disc capacitor one end be connected respectively with the second road power supply, the other end of third ceramic disc capacitor and the second road power supply
Ground is connected；The power ground pin on the second isolation optocoupler pair side, the other end of the 4th ceramic disc capacitor are connected with the second tunnel power ground respectively；
It receives signal to be connected with one end of one end of the 8th resistance, the 9th resistance respectively, the other end connection of the 9th resistance
The base stage of third transistor, the emitter of third transistor, the 8th resistance the other end be connected respectively with the second road power supply, third
The collector of triode is sequentially connected the anode of the tenth resistance and third isolation optocoupler primary side, the cathode of third isolation optocoupler primary side
It is connected with the second tunnel power ground, constitutes the driving circuit of third isolation optocoupler；The output pin on third isolation optocoupler pair side respectively and
One end of 6th ceramic disc capacitor, eleventh resistor one end be connected, constitute the output circuit of third isolation optocoupler, at the same third every
Output pin from optical coupling secondary edges outputs signals to 232 interface units；The power supply power supply foot on third isolation optocoupler pair side, the 11st electricity
The other end of resistance, the 5th tile one end capacitor be connected respectively with first via power supply, the other end and first of the 5th ceramic disc capacitor
Road power ground is connected, the power ground pin on third isolation optocoupler pair side, the 6th ceramic disc capacitor the other end respectively with first via power supply
Ground is connected.
Further, isolation transmission unit further includes the first LED light emitting diode and the 2nd LED light emitting diode, wherein
The anode of first LED light emitting diode and the other end of the 6th resistance are connected, the anode phase of cathode and the second isolation optocoupler primary side
Even, the other end of the anode of the 2nd LED light emitting diode and the tenth resistance is connected, the anode of cathode and third isolation optocoupler primary side
It is connected.
Further, 485 interface units include the second connecting terminal, 485 ceramic disc capacitors, 485 communication chips, 485 first
Resistance, 485 second resistances, the first TVS pipe, the second TVS pipe, third TVS pipe, the first self-recovery fuse, the second self- recoverage are protected
Dangerous silk, the first ceramic gas discharge tube, wherein a foot of 485 communication chips respectively with 485 second resistances, the second TVS pipe,
Three TVS pipes are connected with the second self-recovery fuse, the other end of the second self-recovery fuse respectively with the second connecting terminal, ceramics
One end of gas-discharge tube is connected, another foot of 485 communication chips respectively with 485 first resistors, the first TVS pipe, third TVS pipe
The other end and the first self-recovery fuse be connected, the first self-recovery fuse is put with the second connecting terminal, ceramic gas respectively
The other end of fulgurite is connected, and forms multi-level bus and protects circuit.
Further, power supply power supply unit is inputted using outer be used as DC power supply, and input is wide scope DC6-15V.
Further, it is core chips that 232 interface units, which select single supply electrical level transferring chip MAX232ESE+,.
Further, 485 interface units select half-duplex difference transceiving chip MAX3082 as core chips.
Compared with prior art, the utility model has the beneficial effects that:
1,232 level are carried out using special chip and Transistor-Transistor Logic level conversion, 485 differential signals and Transistor-Transistor Logic level is converted, data
Transmission speed is fast, stability is high, transmission range is long.
2, using wide scope weak mains as inputting, high safety, flexibility is high, and adjustability is strong.
3, individually powered to 232 interface sections with 485 interface sections using isolated power supply, realize bus-powered part every
From；The isolation conversion of bus signals is realized in the transmission that Transistor-Transistor Logic level signal is completed using high-speed isolated optocoupler.
4, using LED light emitting diode as the indication signal sent or received, visuality is strong, understands transmission process, just
In analysis subsequent conversion failure cause.
5, using multi-level protection circuits such as TVS pipe, self-recovery fuse, gas-discharge tubes, communication bus can be effectively suppressed
On the situations such as surge voltage, transient overvoltage, increase its anti-interference ability, improve its service life.
Detailed description of the invention
Fig. 1 is the utility model general structure schematic diagram；
Fig. 2 is the utility model power supply power supply unit schematic diagram；
Fig. 3 is 232 interface unit schematic diagram of the utility model；
Fig. 4 is 485 interface unit schematic diagram of the utility model；
Fig. 5 is the utility model isolation transmission unit schematic diagram.
Specific embodiment
Further explanation is made below in conjunction with working principle of the attached drawing to the utility model.
As shown in Figure 1, a kind of 232 and 485 Bus isolation conversion modules, including power supply power supply unit, 232 interface units,
485 interface units, isolation transmission unit, wherein it is mutually isolated to be converted to two-way by power supply power supply unit for the DC power supply signal of input
Power supply VCC/GND, VDD/GDD, the isolation transmission unit part that VCC/GND mainly gives 232 interface units and is attached thereto supplies
Electricity, the isolation transmission unit part power supply that VDD/GDD mainly gives 485 interface units and is attached thereto.Transmission unit difference is isolated
It is connected with 232 interface units and 485 interface units, when 232 interface units are in transmission state, externally input 232 level
Signal is converted into Transistor-Transistor Logic level signal by 232 interface units, then passes through by isolation transmission unit to 485 interface units
Transistor-Transistor Logic level signal after isolation is converted to 485 differential signal level by 485 interface units, and is externally exported, and realizes 232
Conversion of the bus to 485 buses；When 485 interface units are in transmission state, 485 differential signal is turned by 485 interface units
It is changed to Transistor-Transistor Logic level signal, 232 interface units is sent to by transmission unit is isolated, and be converted into the output of 232 level, realizes 485
Conversion of the bus to 232 buses.
As shown in Fig. 2, power supply power supply element circuit includes connecting terminal J2, fuse F1, diode D1, electrolytic capacitor
EC1, electrolytic capacitor EC2, electrolytic capacitor EC3, ceramic disc capacitor C15, ceramic disc capacitor C16, ceramic disc capacitor C7, ceramic disc capacitor C8, electricity
Source chip U6, power supply chip U7.
It is outer for wide scope (DC6-15V) power voltage source signal Vin, module, terminals are entered by connecting terminal J2
1 foot of sub- J2 is connected with 1 foot of fuse F1,2 feet of fuse F1 are connected with the anode of diode D1, then diode D1
Cathode is connected with the input pin (1 foot) of the anode of electrolytic capacitor EC1,1 foot of ceramic disc capacitor C15, power supply chip U6 respectively；Power supply
The output pin (3 foot) of chip U6 respectively with the anode of electrolytic capacitor EC2,1 foot of ceramic disc capacitor C16, ceramic disc capacitor C7 1 foot,
The input pin (1 foot) of power supply chip U7 is connected, and forms first via power supply VCC；The output pin (4 foot) of power supply chip U7 respectively with
The anode of electrolytic capacitor EC3,1 foot of ceramic disc capacitor C8 are connected, and form the second road power vd D.2 feet, the electricity of connecting terminal J2
Solve " ground " foot (2 foot), the cathode of electrolytic capacitor EC2, porcelain of the cathode of capacitor EC1,2 feet of ceramic disc capacitor C15, power supply chip U6
The input of 2 feet of chip capacitor C16,2 feet of ceramic disc capacitor C7, power supply chip U7 (2 foot) be connected, formed first via power ground
GND；The output ground (3 foot) of power supply chip U7 is connected with 2 feet of the cathode of electrolytic capacitor EC3, ceramic disc capacitor C8 respectively, forms the
Two tunnel power ground GDD.Two-way power supply is mutually isolated, is supplied respectively to 232 interface units and 485 interface units, it is ensured that general line system
The isolation of modular power source power pack.
As shown in figure 3,232 interface unit circuit described in the utility model includes connecting terminal J3, electrolytic capacitor C1, electricity
Solve capacitor C2, electrolytic capacitor C4, electrolytic capacitor C5, ceramic disc capacitor C3, electrical level transferring chip U1, resistance R1, triode Q1, resistance
R11。
232 bus signals RXD/TXD/GND pass through connecting terminal J3 AM access module, electrical level transferring chip model
MAX232ESE+.RXD signal (232 level) is connected by 1 foot of connecting terminal J3 with 14 feet of electrical level transferring chip U1, is passed through
RX signal (Transistor-Transistor Logic level) is formed from 11 feet after electrical level transferring chip U1 conversion；TXD signal (232 level) passes through connecting terminal J3
2 feet be connected with 8 feet of electrical level transferring chip U1,13 feet, by electrical level transferring chip U1 conversion after from 12 feet formed TX signal
(Transistor-Transistor Logic level)；3 feet of connecting terminal J3,10 feet, 15 feet of electrical level transferring chip U1, the anode of electrolytic capacitor C2, ceramic disc capacitor
The transmitting foot of 2 feet of C3, triode Q1 is connected, and is connected to first via power ground GND.1 foot of electrical level transferring chip U1 with
The anode of electrolytic capacitor C4 is connected, and 3 feet of electrical level transferring chip U1 are connected with the cathode of electrolytic capacitor C4；Electrical level transferring chip U1
4 feet be connected with the anode of electrolytic capacitor C5,5 feet of electrical level transferring chip U1 are connected with the cathode of electrolytic capacitor C5；Level turns
2 feet for changing chip U1 are connected with the anode of electrolytic capacitor C1；The cathode phase of 6 feet of electrical level transferring chip U1 and electrolytic capacitor C2
Even；Electrolytic capacitor C1, C2, C4, C5 constitute charge pump circuit, generate level required for RS232.The 9 of electrical level transferring chip U1
Foot is connected with 1 foot of resistance R1, and 2 feet of resistance R1 are connected with the base stage of triode Q1, the collector and resistance R11 of triode Q1
2 feet be connected, and signal RE/TE (Transistor-Transistor Logic level) is formed, as the direction control signal for receiving signal RXD, sending signal TXD；
1 foot of resistance R11, the cathode of electrolytic capacitor C1,16 feet of electrical level transferring chip U1, ceramic disc capacitor C3 1 foot be connected to first
Road power supply VCC, wherein ceramic disc capacitor C3 is power supply filter capacitor.
As shown in figure 4,485 interface unit circuit described in the utility model includes connecting terminal J1, ceramic disc capacitor C6,
485 communication chip U2, resistance R2, resistance R3, TVS pipe V1, TVS pipe V2, TVS pipe V0, self-recovery fuse PPTC1, self- recoverage
Fuse PPTC2, ceramic gas discharge tube FD0.
485 bus signals 485A/485B pass through connecting terminal J1 AM access module.485 communication chip U2 are using dedicated
Differential signal transceiving chip MAX3082, to complete the conversion of 485 differential levels and Transistor-Transistor Logic level, 1 foot of 485 communication chip U2 with
(RX1 is the receiving end after the conversion of 485 bus datas to RX1 signal, this Transistor-Transistor Logic level signal is just converted by isolation transmission unit
RX signal in above-mentioned 232 interface unit) connection, (RE/DE1 is 485 total for 2 feet, 3 feet and the RE/DE1 signal of 485 communication chip U2
Line data receiver/sending direction control terminal, RE/TE will form this TTL electricity after isolation transmission in above-mentioned 232 interface unit
Ordinary mail number) connection, (TX1 is the transmitting terminal before the conversion of 485 bus datas, above-mentioned for 4 feet and TX1 signal of 485 communication chip U2
TX will form this Transistor-Transistor Logic level signal after isolation transmission in 232 interface units) connection.6 feet of 485 communication chip U2 point
It is not connected with 1 foot of 1 foot of resistance R3,1 foot of TVS pipe V2,2 feet of TVS pipe V0, self-recovery fuse PPTC2, self- recoverage is protected
2 feet of dangerous silk PPTC2 are connected with 2 feet of 2 feet of connecting terminal J1, ceramic gas discharge tube FD0 respectively, are connected to 485A letter
Number；7 feet of 485 communication chip U2 respectively with 2 feet of resistance R2,2 feet of TVS pipe V1,1 foot of TVS pipe V0, self-recovery fuse
1 foot of PPTC1 is connected, 2 feet of self-recovery fuse PPTC1 respectively with 1 foot of connecting terminal J1, ceramic gas discharge tube FD0
1 foot be connected, be connected to 485B signal；To constitute multi-level bus protection circuit, wherein 1 grade of protection circuit includes ceramic gas
Discharge tube FD0, the lightning protection for the communication over long distances of 485 buses；2 grades of protection circuits include self-recovery fuse PPTC1, from
Restore fuse PPTC2, when bus meet with heavy current impact when, can quick fuse and protect late-class circuit；3 grades of protection circuits
Comprising TVS pipe V1, TVS pipe V2, TVS pipe V0, when its both ends is subjected to moment high energy impact events, two terminal impedances reduce rapidly and
Voltage clamp is in fixed value, directly protection rear class element.8 feet of 485 communication chip U2 are connected with 1 foot of ceramic disc capacitor C6, even
It is connected to the second road power vd D；5 feet of 485 communication chip U2,2 feet of ceramic disc capacitor C6 are connected to the second tunnel power ground GDD, porcelain
Chip capacitor C6 is power supply filter capacitor.
As shown in figure 5, isolation transmission unit circuit described in the utility model includes resistance R20, triode Q3, resistance
R9, isolation optocoupler U3, resistance R10, ceramic disc capacitor C13, ceramic disc capacitor C14；Resistance R19, resistance R13, triode Q5, resistance
R5, Light-emitting diode LED 1, isolation optocoupler U5, resistance R6, ceramic disc capacitor C9, ceramic disc capacitor C10；Resistance R18, resistance R15, three
Pole pipe Q4, resistance R7, Light-emitting diode LED 2, isolation optocoupler U4, resistance R8, ceramic disc capacitor C11, ceramic disc capacitor C12.
Control 1 foot of signal RE/DE (RE/DE controls signal in above-mentioned 232 interface unit) access resistance R20, resistance R20
2 feet be connected with the base stage of triode Q3, the emitter of triode Q3 is connected with first via power supply VCC, the current collection of triode Q3
Pole is connected with 1 foot of resistance R9, and 2 feet of resistance R9 are connected with the anode (2 foot) of isolation optocoupler U3 primary side, isolation optocoupler U3 primary side
Cathode (3 foot) be connected with first via power ground GND, it is above constitute isolation optocoupler U3 driving circuit；Isolation optocoupler U3 pair side
Output pin (6 foot), 2 feet of resistance R10, ceramic disc capacitor C14 1 foot, output signal RE/DE1 is (in above-mentioned 485 interface unit
RE/DE1 signal), constitute the output circuit of isolation optocoupler U3；Power supply power supply foot (8 foot), the resistance R10 on isolation optocoupler U3 pair side
1 foot, ceramic disc capacitor C13 1 foot be connected with the second road power vd D, 2 feet of ceramic disc capacitor C13 are connected with the second tunnel power ground,
Ceramic disc capacitor C13 is power supply filter capacitor；The power ground pin (5 foot) on isolation optocoupler U3 pair side, 2 feet of ceramic disc capacitor C14 and
Two tunnel power ground GDD are connected.
Signal TX (TX sends signal in above-mentioned 232 interface unit) accesses 2 feet of resistance R19,1 foot of resistance R13, resistance
2 feet of R13 are connected with the base stage of triode Q5, the emitter of triode Q5, resistance R19 1 foot respectively with first via power supply VCC
It is connected；The collector of triode Q5 is connected with 1 foot of resistance R5, and 2 feet of resistance R5 are connected with the anode of Light-emitting diode LED 1,
The cathode of Light-emitting diode LED 1 is connected with the anode (2 foot) of isolation optocoupler U5 primary side, the cathode (3 foot) of isolation optocoupler U5 primary side
It is connected with first via power ground GND, the above driving circuit for constituting isolation optocoupler U5, wherein Light-emitting diode LED 1 is as transmission
Signal lamp, as having signal process in transmission, LED flash, flicker frequency is directly proportional to transmission rate, therefore can
It is visual strong according to the transmission state of luminance response data.The 2 of the output pin (6 foot) on isolation optocoupler U5 pair side, resistance R6
Foot, 1 foot of ceramic disc capacitor C10, output signal TX1 (TX1 sends signal in above-mentioned 485 interface unit) constitute isolation optocoupler U5
Output circuit；The power supply power supply foot (8 foot) on isolation optocoupler U5 pair side, 1 foot of resistance R6, ceramic disc capacitor C9 1 foot and second
Road power vd D is connected；The secondary side power ground pin (5 foot) of isolation optocoupler U5,2 feet of ceramic disc capacitor C10 and the second tunnel power ground GDD
It is connected, ceramic disc capacitor C9 is power supply filter capacitor.
Signal RX1 (RX1 receives signal in above-mentioned 485 interface unit) accesses 2 feet of resistance R18,1 foot of resistance R15, electricity
2 feet of resistance R15 are connected with the base stage of triode Q4, the emitter of triode Q4, resistance R18 1 foot respectively with the second road power supply
VDD is connected；The collector of triode Q4 is connected with 1 foot of resistance R7,2 feet and the anode phase of Light-emitting diode LED 2 of resistance R7
Even, the cathode of Light-emitting diode LED 2 is connected with the anode (2 foot) of isolation optocoupler U4 primary side, the cathode (3 of isolation optocoupler U4 primary side
Foot) it is connected with the second tunnel power ground GDD, the above driving circuit for constituting isolation optocoupler U4, wherein 2 conduct of Light-emitting diode LED
Signal lamp is received, as having signal process in transmission, LED flash, flicker frequency is directly proportional to transmission rate, because
This can be visual strong according to the transmission state of luminance response data.Output pin (6 foot), the resistance on isolation optocoupler U4 pair side
2 feet of R8,1 foot of ceramic disc capacitor C12, output signal RX (RX sends signal in above-mentioned 232 interface unit) constitute isolation optocoupler
The output circuit of U4；Power supply power supply foot (8 foot), 1 foot of resistance R8,1 foot of ceramic disc capacitor C11 and on isolation optocoupler U4 pair side
Power supply VCC is connected all the way；2 feet and first via power ground of the power ground pin (5 foot) on isolation optocoupler U4 pair side, ceramic disc capacitor C12
GND is connected, and ceramic disc capacitor C11 is power supply filter capacitor.
The description of above embodiments is more specific, in detail, but it cannot be understood as the limitation to this patent range,
It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the premise utility, may be used also
To make several modifications and improvements, these are all within the protection scope of the present invention.
Claims (8)
1. a kind of 232 and 485 Bus isolation conversion modules, it is characterised in that including power supply power supply unit, 232 interface units, 485
Interface unit, isolation transmission unit, wherein power supply power supply unit is transmitted with 232 interface units, 485 interface units, isolation respectively
Unit connection, powers to latter three, and isolation transmission unit is connected with 232 interface units and 485 interface units respectively, connects 232
When mouth unit is in transmission state, externally input 232 level signal is converted into Transistor-Transistor Logic level signal by 232 interface units, so
The Transistor-Transistor Logic level signal after isolation is converted to 485 by 485 interface units to 485 interface units by isolation transmission unit afterwards
Differential signal level, and externally exported, realize the conversion of 232 buses to 485 buses；485 interface units, which are in, sends shape
When state, 485 differential signal is converted to Transistor-Transistor Logic level signal by 485 interface units, sends 232 to by transmission unit is isolated
Interface unit, and it is converted into the output of 232 level, realize the conversion of 485 buses to 232 buses.
2. a kind of 232 and 485 Bus isolation conversion module according to claim 1, it is characterised in that the power supply supplies
Electric unit includes the first connecting terminal, the first fuse, power supply first diode, the first electrolytic capacitor of power supply, the second electricity of power supply
It solves capacitor, power supply third electrolytic capacitor, the first ceramic disc capacitor of power supply, the second ceramic disc capacitor of power supply, power supply third ceramic disc capacitor, supply
Electric 4th ceramic disc capacitor, the first power supply chip, second source chip, wherein one end of the first connecting terminal is successively protected with first
Dangerous silk, power first diode anode sequence be connected, the cathode for first diode of powering respectively with the first electrolytic capacitor of powering
Anode, the one end of the first ceramic disc capacitor of powering, the first power supply chip input terminal be connected, the output end point of the first power supply chip
Not with the anode of the second electrolytic capacitor of power supply, the one end for the second ceramic disc capacitor of powering, third ceramic disc capacitor of powering one end and the
The input terminal of two power supply chips is connected, and forms first via power supply；The output end of second source chip is electrolysed with power supply third respectively
The anode of capacitor, the one end for the 4th ceramic disc capacitor of powering are connected, form the second road power supply；
The other end of first connecting terminal, the cathode for the first electrolytic capacitor of powering, the other end for the first ceramic disc capacitor of powering, first
Power supply chip lower margin, the cathode for the second electrolytic capacitor of powering, the other end for the second ceramic disc capacitor of powering, power supply third ceramic disc capacitor
The other end, second source chip input be connected, formed first via power ground；The output ground of second source chip respectively with
The cathode of power supply third electrolytic capacitor, the other end for the 4th ceramic disc capacitor of powering are connected, form the second tunnel power ground.
3. a kind of 232 and 485 Bus isolation conversion module according to claim 2, it is characterised in that the isolation passes
Defeated unit includes first resistor, the first triode, second resistance, the first isolation optocoupler, 3rd resistor, the first ceramic disc capacitor,
Two ceramic disc capacitors, the 4th resistance, the 5th resistance, the second triode, the 6th resistance, the first light emitting diode, the second isolation optocoupler,
7th resistance, third ceramic disc capacitor, the 4th ceramic disc capacitor, the 8th resistance, the 9th resistance, third transistor, the tenth resistance, second
Light emitting diode, third isolation optocoupler, eleventh resistor, the 5th ceramic disc capacitor, the 6th ceramic disc capacitor, wherein the first isolation light
Coupling is used for the control signal of isolated data transmission, and the second isolation optocoupler is used for the transmission signal of isolated data transmission, third isolation
Optocoupler is used for the reception signal of isolated data transmission, wherein send signal and receive signal be relative to 232 interface units and
Speech；
Control signal is successively connected with first resistor, the base stage of the first triode sequence, the emitter of the first triode and first
Road power supply is connected, and collector is successively connected with second resistance, the anode sequence of the first isolation optocoupler primary side, the first isolation optocoupler
The cathode of primary side is connected with first via power ground, constitutes the driving circuit of the first isolation optocoupler；First isolation optocoupler pair side it is defeated
Foot is connected with one end of one end of 3rd resistor, the second ceramic disc capacitor respectively out, constitutes the output circuit of the first isolation optocoupler, together
When the first isolation optocoupler pair side output pin output signals to 485 interface units；The power supply power supply foot on the first isolation optocoupler pair side,
The other end of 3rd resistor, the first ceramic disc capacitor one end be connected respectively with the second road power supply, the other end of the first ceramic disc capacitor
It is connected with the second tunnel power ground；The power ground pin on the first isolation optocoupler pair side, the second ceramic disc capacitor the other end respectively with second
Road power ground is connected；
It sends signal to be connected with one end of one end of the 4th resistance, the 5th resistance respectively, the other end and the two or three of the 5th resistance
The base stage sequence of pole pipe is connected, and the collector of the second triode is sequentially connected the anode of the 6th resistance, the second isolation optocoupler primary side,
The other end of its emitter and the 4th resistance is connected with first via power supply respectively, the cathode and the first via of the second isolation optocoupler primary side
Power ground is connected, and constitutes the driving circuit of the second isolation optocoupler；The output pin on the second isolation optocoupler pair side respectively with the 7th resistance
One end, the 4th ceramic disc capacitor one end be connected, constitute the output circuit of the second isolation optocoupler, while the second isolation optocoupler pair side
Output pin output signals to 485 interface units；The power supply power supply foot on the second isolation optocoupler pair side, the 7th resistance the other end,
One end of third ceramic disc capacitor is connected with the second road power supply respectively, the other end of third ceramic disc capacitor and the second tunnel power ground phase
Even；The power ground pin on the second isolation optocoupler pair side, the other end of the 4th ceramic disc capacitor are connected with the second tunnel power ground respectively；
It receives signal to be connected with one end of one end of the 8th resistance, the 9th resistance respectively, the other end of the 9th resistance connects third
The base stage of triode, the emitter of third transistor, the 8th resistance the other end be connected respectively with the second road power supply, the three or three pole
The collector of pipe is sequentially connected the anode of the tenth resistance and third isolation optocoupler primary side, the cathode of third isolation optocoupler primary side and
Two tunnel power grounds are connected, and constitute the driving circuit of third isolation optocoupler；The output pin on third isolation optocoupler pair side is respectively with the 6th
One end of ceramic disc capacitor, one end of eleventh resistor are connected, and constitute the output circuit of third isolation optocoupler, while light is isolated in third
The output pin on coupling pair side outputs signals to 232 interface units；The power supply power supply foot on third isolation optocoupler pair side, eleventh resistor
The other end, the 5th tile one end capacitor be connected respectively with first via power supply, the other end of the 5th ceramic disc capacitor and first via electricity
Be connected to source, the power ground pin on third isolation optocoupler pair side, the 6th ceramic disc capacitor the other end respectively with first via power ground phase
Even.
4. a kind of 232 and 485 Bus isolation conversion module according to claim 3, it is characterised in that the isolation passes
Defeated unit further includes the first LED light emitting diode and the 2nd LED light emitting diode, wherein the anode of the first LED light emitting diode
It is connected with the other end of the 6th resistance, the anode of cathode and the second isolation optocoupler primary side is connected, the sun of the 2nd LED light emitting diode
Pole is connected with the other end of the tenth resistance, and cathode is connected with the anode of third isolation optocoupler primary side.
5. a kind of 232 and 485 Bus isolation conversion module according to claim 1, it is characterised in that 485 interfaces
Unit includes the second connecting terminal, 485 ceramic disc capacitors, 485 communication chips, 485 first resistors, 485 second resistances, the first TVS
Pipe, the second TVS pipe, third TVS pipe, the first self-recovery fuse, the second self-recovery fuse, the first ceramic gas discharge tube,
Wherein, a foot of 485 communication chips respectively with 485 second resistances, the second TVS pipe, third TVS pipe and the second self-recovery fuse
It is connected, the other end of the second self-recovery fuse is connected with one end of the second connecting terminal, ceramic gas discharge tube respectively, and 485
Another foot of communication chip insures with 485 first resistors, the first TVS pipe, the other end of third TVS pipe and the first self- recoverage respectively
Silk is connected, and the first self-recovery fuse is connected with the other end of the second connecting terminal, ceramic gas discharge tube respectively.
6. a kind of 232 and 485 Bus isolation conversion module according to claim 1, it is characterised in that the power supply supplies
Electric unit is inputted using outer be used as DC power supply, and input is wide scope DC6-15V.
7. a kind of 232 and 485 Bus isolation conversion module according to claim 1, it is characterised in that 232 interfaces
It is core chips that unit, which selects single supply electrical level transferring chip MAX232ESE+,.
8. a kind of 232 and 485 Bus isolation conversion module according to claim 1, it is characterised in that 485 interfaces
Unit selects half-duplex difference transceiving chip MAX3082 as core chips.
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| CN201821588041.7U CN208834295U (en) | 2018-09-28 | 2018-09-28 | A kind of 232 and 485 Bus isolation conversion modules |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110417251A (en) * | 2019-07-09 | 2019-11-05 | 广东美的制冷设备有限公司 | Pfc circuit and air conditioner |
| CN112712684A (en) * | 2020-12-16 | 2021-04-27 | 安徽阿瑞特汽车电子科技有限公司 | Portable bluetooth 485 conversion boxes for automobile debugging |
| CN113311357A (en) * | 2021-05-11 | 2021-08-27 | 万帮数字能源股份有限公司 | Alternating-current charging stake short circuit detection circuitry |
| CN114745224A (en) * | 2022-05-20 | 2022-07-12 | 淮安威灵电机制造有限公司 | Isolated asynchronous communication circuit and method of household appliance and household appliance |
| CN114760164A (en) * | 2022-05-20 | 2022-07-15 | 淮安威灵电机制造有限公司 | Isolated asynchronous communication circuit and method for household appliance |
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2018
- 2018-09-28 CN CN201821588041.7U patent/CN208834295U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110417251A (en) * | 2019-07-09 | 2019-11-05 | 广东美的制冷设备有限公司 | Pfc circuit and air conditioner |
| CN112712684A (en) * | 2020-12-16 | 2021-04-27 | 安徽阿瑞特汽车电子科技有限公司 | Portable bluetooth 485 conversion boxes for automobile debugging |
| CN113311357A (en) * | 2021-05-11 | 2021-08-27 | 万帮数字能源股份有限公司 | Alternating-current charging stake short circuit detection circuitry |
| CN114745224A (en) * | 2022-05-20 | 2022-07-12 | 淮安威灵电机制造有限公司 | Isolated asynchronous communication circuit and method of household appliance and household appliance |
| CN114760164A (en) * | 2022-05-20 | 2022-07-15 | 淮安威灵电机制造有限公司 | Isolated asynchronous communication circuit and method for household appliance |
| CN114760164B (en) * | 2022-05-20 | 2023-10-27 | 淮安威灵电机制造有限公司 | Isolated asynchronous communication circuit and method for household appliance |
| CN114745224B (en) * | 2022-05-20 | 2023-11-21 | 淮安威灵电机制造有限公司 | Isolated asynchronous communication circuit and method of household appliance and household appliance |
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