CN206178787U - A control circuit for improving RS485 bus data transmission reliability - Google Patents
A control circuit for improving RS485 bus data transmission reliability Download PDFInfo
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- CN206178787U CN206178787U CN201620961948.8U CN201620961948U CN206178787U CN 206178787 U CN206178787 U CN 206178787U CN 201620961948 U CN201620961948 U CN 201620961948U CN 206178787 U CN206178787 U CN 206178787U
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- photoelectrical coupler
- interface chip
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Abstract
The utility model provides a control circuit for improving RS485 bus data transmission reliability which the characteristics are to include: main chip U1, by main chip U1 control, the RS485 communication interface's that constitutes by resistance R50, optoelectronic coupler IC3 and resistance R65 messenger's ability, transmitting circuit, the RS485 communication interface's who constitutes by resistance R61, R40, R66 and optoelectronic coupler IC2 receiving circuit. Owing to adopt optoelectronic coupler and resistance cooperation, receipts that the principle of utilizing the RS485 communication realized, send out to make and to change, can effectively solve and occupy the IO resource among the prior art to and under the circumstances of high speed, big packet, the problem of reliable data transmission. Has simple structure, data transmission rate height, good reliability, noiseless, bit error rate low grade advantage.
Description
Technical field
This utility model is related to communication technical field, is a kind of control for improving RS485 bus data transfer reliabilities
Circuit processed.
Background technology
RS485 buses are half-duplex operations.When bus connect multiple websites when, any time can only have a point in send out
The state sent, other points are in the state for receiving；Transmission state is in if greater than a point, it will cause bus collision,
Receiving point can not correct receiving data.So in such communication network, the reliable and stable transmission for controlling each point
Reception state is just particularly important.The transmitting-receiving for only reliably controlling RS485 interface chips enables signal, just can guarantee that data
Can reliably transmit.Chinese Patent Application No. 201410403802.7 discloses entitled《One kind is used to improve RS485 number of buses
According to the enable signal control circuit of transmission reliability》, the enable control mouth circuit part of its key is using NAND gate, resistance and electricity
Hold the circuit of composition, not only increased the complexity of circuit, and its principle realized there is also unreliability.Concrete analysis
It is as follows：
1. understood that risk and the phenomenon for competing occurs in combinational logic circuit by known circuits principle：
Competition：In combinational logic circuit, certain input variable passes to outfan by two or more approach,
Because every approach time delay is different, reach after the time of out gate just has and first have, this phenomenon is referred to as competed.Risk：Letter
Number in device inside by line and during logical block, there are certain time delay, the size of time delay and the length of line and logic
The number of unit is relevant, while the condition such as manufacturing process, running voltage, temperature also by device is affected, and the height of signal
Low transition is also required to certain transit time.Due to there is these two aspects factor, the wink of Combinational logic output signal intensity
Between have sequencing, be not simultaneously change, some incorrect spikings often occur, these spikings are referred to as "
Burr ".If there is " burr " to occur in a combinational logic circuit, just illustrate that the circuit has risk；
2. it enables the RC circuits adopted in control circuit can have different reactions to the signal of different frequency, while electric capacity
Capacitance can change with temperature change, and the bigger capacitance change of temperature change is also bigger, so causing the circuit to different frequencies
Rate response can change with temperature, and then affect the reliability communicated under different temperatures, and secondly its electric capacity for using does not have
Polarity, such electric capacity feature itself be stopping direct current electric current not every alternating current, if (frequency is the cycle to the frequency of the change of electric capacity
Change equivalent to exchange) it is more high just certainly will can produce impacts to communicating waveform, so the RC circuits are using in different temperature
With the reliability that communication can be directly affected under output frequency；
3. the component number used when being understood and completed unit of function circuit under the same conditions by common knowledge is fewer
Its circuit reliability is relatively higher, and more relative reliabilities that component number is used are lower, reliability with using circuit
Complexity is inversely proportional to, that is, the probability of the more complicated failure of the circuit for using is bigger；
4. the Primary Component in circuit affects little device using on factors such as ambient temperature and frequencies as far as possible, and its impact is right
Components and parts affect less reliability higher.
The content of the invention
The purpose of this utility model is, for the deficiencies in the prior art, there is provided a kind of simple structure, message transmission rate
The low control circuit for improving RS485 bus data transfer reliabilities of high, highly reliable, the noiseless, bit error rate.
Realize that the technical scheme that utility model purpose is adopted is, one kind is used to improve RS485 bus data transfer reliabilities
Control circuit, it is characterized in that, including：The pin 9 of master chip U1, master chip U1 is connected with resistance R50 one end, and resistance R50 is another
One end is connected with the pin 2 of photoelectrical coupler IC3, and the pin 1 of photoelectrical coupler IC3 meets power supply VCC1, photoelectrical coupler IC3's
Pin 4 meets power vd D, and the pin 3 of photoelectrical coupler IC3 draws with RS485 interface chip U3 again after being connected with resistance R65 one end
Foot 2, pin 3 connect, another terminations GND2 of resistance R65, and the pin 10 of master chip U1 is connected with resistance R66 one end, and resistance R66 is another
It is connected after one end is connected with resistance R40 and with the pin 4 of photoelectrical coupler IC2, the resistance R40 other ends connect with power supply VCC1
Connect, the pin 3 of photoelectrical coupler IC2 is grounded, the pin 1 of photoelectrical coupler IC2 is connected with resistance R61, another terminations of resistance R61
The pin 2 of power vd D, photoelectrical coupler IC2 is connected with the pin 1 of RS485 interface chip U3, and RS485 interface chip U3's draws
Foot 4, pin 5 meet GND2, and the pin 8 of RS485 interface chip U3 connects power vd D, the pin 6 and resistance of RS485 interface chip U3
It is connected with Interface Terminal 485-1 again after the connection of R9 one end, the resistance R9 other ends are connected with VDD, transition diode TVS1 one end connects
The pin 6 of RS485 interface chip U3 is connect, the other end connects the pin 7 of RS485 interface chip U3, and RS485 interface chip U3's draws
Foot 7 is connected after being connected with resistance R6 with critesistor RT42 one end, and resistance R6 other ends connection GND2, critesistor RT42 is another
End is connected with Interface Terminal 485-2.
Model FM3308 of the master chip U1.
A kind of control circuit for improving RS485 bus data transfer reliabilities of this utility model, using photoelectric coupling
Device and resistance coordinate, and the sending and receiving that the principle communicated using RS485 is realized enable conversion, can be accounting in effectively solving prior art
With I/O resource, and in the case of two-forty, big data bag, the problem of reliable data transmission.With simple structure, data are passed
Defeated speed is high, highly reliable, noiseless, the low advantage of the bit error rate.
Description of the drawings
Fig. 1 is a kind of control circuit schematic diagram for improving RS485 bus data transfer reliabilities；
Fig. 2 is master chip U1 circuit theory diagrams in Fig. 1.
Specific embodiment
Below in conjunction with the accompanying drawings technology contents of the present utility model are further described with specific embodiment.
See figures.1.and.2, a kind of control electricity for improving RS485 bus data transfer reliabilities of the present utility model
Road, including：The pin 9 of master chip U1, master chip U1 is connected with resistance R50 one end, the resistance R50 other ends and photoelectrical coupler
The pin 2 of IC3 is connected, and the pin 1 of photoelectrical coupler IC3 meets power supply VCC1, and the pin 4 of photoelectrical coupler IC3 meets power vd D,
Pin 2, pin 3 after the pin 3 of photoelectrical coupler IC3 is connected with resistance R65 one end again with RS485 interface chip U3 is connected,
Another terminations GND2 of resistance R65.The pin 10 of master chip U1 is connected with resistance R66 one end, the resistance R66 other ends and resistance R40
It is connected with the pin 4 of photoelectrical coupler IC2 again after being connected, the resistance R40 other ends are connected with power supply VCC1, photoelectrical coupler
The pin 3 of IC2 is grounded, and the pin 1 of photoelectrical coupler IC2 is connected with resistance R61, another termination power vd D of resistance R61, photoelectricity
The pin 2 of bonder IC2 is connected with the pin 1 of RS485 interface chip U3, and the pin 4 of RS485 interface chip U3, pin 5 connect
The pin 8 of GND2, RS485 interface chip U3 meets power vd D, after the pin 6 of RS485 interface chip U3 is connected with resistance R9 one end
It is connected with Interface Terminal 485-1 again, the resistance R9 other ends are connected with VDD, transition diode TVS1 one end connection RS485 interface cores
The pin 6 of piece U3, the other end connects the pin 7 of RS485 interface chip U3, and pin 7 and the resistance R6 of RS485 interface chip U3 connect
It is connected with critesistor RT42 one end after connecing, the resistance R6 other ends connect GND2, the critesistor RT42 other ends and Interface Terminal
485-2 connects.The enable of RS485 communication interfaces, transtation mission circuit are constituted by resistance R50, photoelectrical coupler IC3 and resistance R65,
The receiving circuit of RS485 communication interfaces is constituted by resistance R61, R40, R66, photoelectrical coupler IC2.The model of master chip U1
FM3308, also can be according to the function of master chip, and those skilled in the art are according to other chips of the function selecting of FM3308.Power supply
VDD and GND2 is a power-supply system, and power supply VCC1 is another power-supply system with ground, and " 0 ", " 1 " correspond to each electricity
Origin system.
A kind of pin for improving the control circuit master chip U1 of RS485 bus data transfer reliabilities of this utility model
9 are connected with resistance R50 one end, and the resistance R50 other ends are connected with the pin 2 of photoelectrical coupler IC3, for controlling the RS485
The enable signal and transmission data signal of interface chip U3；The pin 2 of the RS485 interface chips U3, i.e. pinShi Gong
Make, the pin 4 of RS485 interface chip U3 not receiving data, i.e., in sending illegal state；The RS485 interface chips U3's
PinWhen work, the receiving data of pin 4 of RS485 interface chip U3, i.e., in send state；The RS485 interfaces core
When piece U3 does not work, its pin 6,7 is high-impedance state, is high level between pin 6,7；The RS485 interface chips U3 work
When, its pin 6,7 is working condition, is low level between pin 6,7；It is described start send data " 0 " when, photoelectrical coupler
Interior light emitting diodes conducting when the pin 2 of IC3 is low level, while the phototriode of the pin 3,4 of photoelectrical coupler IC3
Conducting, the pin 2,3 of RS485 interface chip U3 is high level, and now chip is in transmission state, due to RS485 interface chips
The pin 4 (transmission pin) of U3 meets GND2, GND2=0, so can export one between the pin 6,7 of RS485 interface chip U3
Low level less than 0.2V, completes the process for transferring out data " 0 "；It is described when send data " 1 " when, photoelectrical coupler
The pin 2 of IC3 is the cut-off of high level diode, the phototriode cut-off of the pin 3,4 of photoelectrical coupler IC3, because R65 is
Pull down resistor, the pin 2 of RS485 interface chip U3,3 feet are low level, and now RS485 interface chips U3 is reception state, but
When now RS485 interface chips U3 is off position, its pin 6,7 is high-impedance state, is high level between pin 6,7, i.e.,
RS485 interface chips U3 is sent in illegal state is sent, and the pin 6,7 of RS485 interface chip U3 is high-impedance state, is maintained
Original high level, the mistake for transferring out data " 1 " is indirectly completed using the work characteristics of RS485 interface chip U3
Journey.
A kind of control circuit for improving RS485 bus data transfer reliabilities of this utility model, using photoelectric coupling
Device and resistance coordinate, and the sending and receiving that the principle communicated using RS485 is realized enable conversion, can be accounting in effectively solving prior art
With I/O resource, and in the case of two-forty, big data bag, the problem of reliable data transmission.With message transmission rate it is high,
The low advantage of highly reliable, the noiseless, bit error rate.
A kind of all electronic devices and components of control circuit for improving RS485 bus data transfer reliabilities of this utility model
It is commercially available prod.
This utility model is not limited to this specific embodiment, to those skilled in the art, without creativeness
The simple copy and improvement of work belongs to this utility model scope of the claimed protection.
Claims (2)
1. a kind of control circuit for improving RS485 bus data transfer reliabilities, is characterized in that, including：Master chip U1, it is main
The pin 9 of chip U1 is connected with resistance R50 one end, and the resistance R50 other ends are connected with the pin 2 of photoelectrical coupler IC3, light thermocouple
The pin 1 of clutch IC3 meets power supply VCC1, and the pin 4 of photoelectrical coupler IC3 meets power vd D, the pin 3 of photoelectrical coupler IC3 with
Pin 2, pin 3 after resistance R65 one end is connected again with RS485 interface chip U3 is connected, resistance R65 other ends connection GND2,
The pin 10 of master chip U1 is connected with resistance R66 one end, the resistance R66 other ends be connected with resistance R40 after again and photoelectric coupling
The pin 4 of device IC2 connects, and the resistance R40 other ends are connected with power supply VCC1, and the pin 3 of photoelectrical coupler IC2 is grounded, light thermocouple
The pin 1 of clutch IC2 is connected with resistance R61, another termination power vd D of resistance R61, the pin 2 of photoelectrical coupler IC2 with
The pin 1 of RS485 interface chip U3 connects, and the pin 4 of RS485 interface chip U3, pin 5 meet GND2, RS485 interface chip U3
Pin 8 meet power vd D, the pin 6 of RS485 interface chip U3 connects again after being connected with resistance R9 one end with Interface Terminal 485-1
Connect, the resistance R9 other ends are connected with VDD, transition diode TVS1 one end connects the pin 6 of RS485 interface chip U3, the other end
Connection RS485 interface chip U3 pin 7, the pin 7 of RS485 interface chip U3 be connected with resistance R6 after with critesistor RT42
One end connects, and resistance R6 other ends connection GND2, the critesistor RT42 other ends are connected with Interface Terminal 485-2.
2. a kind of control circuit for improving RS485 bus data transfer reliabilities according to claim 1, its feature
It is, model FM3308 of the master chip U1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620961948.8U CN206178787U (en) | 2016-08-27 | 2016-08-27 | A control circuit for improving RS485 bus data transmission reliability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620961948.8U CN206178787U (en) | 2016-08-27 | 2016-08-27 | A control circuit for improving RS485 bus data transmission reliability |
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| CN206178787U true CN206178787U (en) | 2017-05-17 |
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| CN201620961948.8U Active CN206178787U (en) | 2016-08-27 | 2016-08-27 | A control circuit for improving RS485 bus data transmission reliability |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106201940A (en) * | 2016-08-27 | 2016-12-07 | 谢怡涛 | A kind of control circuit for improving RS485 bus data transfer reliability |
| CN110650068A (en) * | 2019-10-18 | 2020-01-03 | 湖南小步科技有限公司 | Communication circuit and communication test method of remote controller performance test device |
-
2016
- 2016-08-27 CN CN201620961948.8U patent/CN206178787U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106201940A (en) * | 2016-08-27 | 2016-12-07 | 谢怡涛 | A kind of control circuit for improving RS485 bus data transfer reliability |
| CN110650068A (en) * | 2019-10-18 | 2020-01-03 | 湖南小步科技有限公司 | Communication circuit and communication test method of remote controller performance test device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201030 Address after: 518055 Guangdong city of Shenzhen province Nanshan District Xili Longjing High Technology Park 3 6 floor Patentee after: SHENZHEN JIANGJI INDUSTRIAL Co.,Ltd. Patentee after: JILIN POWER SUPPLY COMPANY OF STATE GRID JILINSHENG ELECTRIC POWER SUPPLY Co. Address before: 518055 Guangdong city of Shenzhen province Nanshan District Xili Longjing High Technology Park 3 6 floor Patentee before: SHENZHEN JIANGJI INDUSTRIAL Co.,Ltd. |
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| TR01 | Transfer of patent right |