CN104579419B - Signal enhancement equipment and RS-485 communication system - Google Patents
Signal enhancement equipment and RS-485 communication system Download PDFInfo
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- CN104579419B CN104579419B CN201510043588.3A CN201510043588A CN104579419B CN 104579419 B CN104579419 B CN 104579419B CN 201510043588 A CN201510043588 A CN 201510043588A CN 104579419 B CN104579419 B CN 104579419B
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Abstract
The invention provides signal enhancement equipment applied to an RS-485 communication system. The signal enhancement equipment comprises a pull-up circuit, a pull-down circuit, a rectifying circuit and an energy storing circuit, wherein the pull-up circuit is connected with the end A of an RS-485 communication bus and the energy storing circuit, the pull-down circuit is connected with the end B of the RS-485 communication bus and the energy storing circuit, the rectifying circuit is connected with the end A and the end B of the RS-485 communication bus and the energy storing circuit, and the energy storing circuit can input current to the RS-485 communication bus through the pull-up circuit and the pull-down circuit. The RS-485 communication bus can charge the energy storing circuit through the rectifying circuit. By the signal enhancement equipment, communication capability of the RS-485 communication bus is improved.
Description
Technical field
The invention belongs to field of circuit technology, more particularly to a kind of signal enhancing being applied in RS-485 communication systems sets
Standby and RS-485 communication systems.
Background technology
RS-485 is a kind of serial communication link layer protocol based on differential signal transmission, is widely used in automobile, electronics
Telecommunication apparatus, LAN, cellular basestation and Industry Control instrument and meter etc. are applied.In RS-485 communication systems, typically adopt
Two-wire system is taken, master slave communication mode, the mode of connection generally uses bus type topological structure, can be accessed in bus multiple logical
Letter node, the communication node is connected in series on RS-485 communication bus, is communicated by RS-485 communication bus.
But, it is this to take two-wire system, the RS-485 communication systems of master slave communication mode, when the access on communication bus
Communication node it is excessive when, bus cable will be long, more resistance can be brought to consume so that can not be provided in communication process
Enough driving currents, cause communication failure.
The content of the invention
In view of this, this application provides a kind of signal enhancing equipment being applied in RS-485 communication systems and RS-
485 communication systems, for communication node provides driving current, reduce communication failure.
To achieve the above object, the application provides following technical scheme：
First aspect, there is provided a kind of signal enhancing equipment being applied in RS-485 communication systems, the communication system
Including the multiple RS-485 communication nodes being connected on RS-485 communication bus, the RS-485 communication bus is passed using two-wire
Defeated, each RS-485 communication node is respectively connecting to the A ends and B ends of the RS-485 communication bus, the signal enhancing
Equipment includes：
Pull-up circuit, pull-down circuit, rectification circuit and accumulator；
The pull-up circuit is connected with the A ends of the RS-485 communication bus and the accumulator respectively；
The pull-down circuit is connected with the B ends of the RS-485 communication bus and the accumulator respectively；
Rectification circuit A ends respectively with the RS-485 communication bus, the B ends of the RS-485 communication bus and
The accumulator connection；
The RS-485 communication bus can be charged by the rectification circuit to the accumulator；The accumulator
Can be by the pull-up circuit and pull-down circuit to the RS-485 communication bus output current.
Preferably, the rectification circuit includes the first diode and the second diode；
First diodes in parallel is at the two ends of the pull-up circuit；
The positive pole of first diode is connected with the A ends of the RS-485 communication bus；
Second diodes in parallel is at the two ends of the pull-down circuit；
The negative pole of second diode is connected with the B ends of the RS-485 communication bus.
Preferably, the rectification circuit includes the first diode, the second diode, the 3rd diode and the four or two pole
Pipe；
The positive pole of first diode respectively with the A ends of the RS-485 communication bus and the 3rd diode
Negative pole is connected, and negative pole is connected with the first end of the accumulator；
The positive pole of the 3rd diode is connected with the second end of the accumulator；
The positive pole of second diode is connected with the second end of the accumulator, and negative pole is logical with the RS-485 respectively
Believe that the B ends of bus and the positive pole of the 4th diode are connected；
The negative pole of the 4th diode is connected with the first end of the accumulator；
Wherein, the pull-up circuit respectively with the first end and the A of the RS-485 communication bus of the accumulator
End is connected；
The pull-down circuit the second end respectively with the accumulator and the B ends phase of the RS-485 communication bus
Even.
Preferably, the accumulator is made up of N number of electric capacity being connected in series, wherein, N is the integer more than or equal to 1.
Preferably, the pull-up circuit is first resistor, and the pull-down circuit is second resistance.
Preferably, the first resistor and the second resistance are respectively 1 kilo-ohm.
Preferably, the capacitance of the electric capacity is 1 microfarad.
A kind of second aspect, there is provided RS-485 communication systems, including it is connected to the multiple RS- on RS-485 communication bus
485 communication nodes and signal enhancing equipment described above.
Understood via above-mentioned technical scheme, compared with prior art, be applied to RS-485 this application provides one kind and lead to
Signal enhancing equipment and RS-485 communication systems in letter system, the signal enhancing equipment are connected to RS-485 communication bus
On, including pull-up circuit, pull-down circuit, rectification circuit and accumulator, RS-485 communication bus can be by rectification circuit
Charged to accumulator；Accumulator can by pull-up circuit and pull-down circuit to RS-485 communication bus output currents, because
This can provide driving current by the signal enhancing equipment to RS-485 communication bus, total so as to improve RS-485 communications
The communication capacity of line.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is a kind of schematic diagram of RS-485 system communication bus provided in an embodiment of the present invention；
Fig. 2 is that a kind of structure of enhancing equipment being applied in RS-485 communication system signals provided in an embodiment of the present invention is shown
It is intended to；
Fig. 3 is another knot of the signal enhancing equipment being applied in RS-485 communication systems provided in an embodiment of the present invention
Structure schematic diagram；
Fig. 4 is another knot of the signal enhancing equipment being applied in RS-485 communication systems provided in an embodiment of the present invention
Structure schematic diagram；
Fig. 5 is another knot of the signal enhancing equipment being applied in RS-485 communication systems provided in an embodiment of the present invention
Structure schematic diagram；
Fig. 6 is another knot of the signal enhancing equipment being applied in RS-485 communication systems provided in an embodiment of the present invention
Structure schematic diagram；
Fig. 7 is another knot of the signal enhancing equipment being applied in RS-485 communication systems provided in an embodiment of the present invention
Structure schematic diagram；
Fig. 8 is another knot of the signal enhancing equipment being applied in RS-485 communication systems provided in an embodiment of the present invention
Structure schematic diagram.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
A kind of signal enhancing equipment being applied in RS-485 communication systems, the RS- are provided in the embodiment of the present invention
485 communication systems include the multiple RS-485 communication nodes being connected on RS-485 communication bus, the RS-485 communication bus
Using Double wire transmission, each RS-485 communication node is respectively connecting to the A ends and B ends of the RS-485 communication bus.
As shown in figure 1, figure center line A, B are the A ends and B ends of RS-485 communication bus, each unit is each communication node,
General master unit 101 refers to principal communication node, and subelement 102 refers to sub- communication node.
As shown in Fig. 2 for a kind of signal enhancing being applied in RS-485 communication systems provided in an embodiment of the present invention sets
The structural representation of standby one embodiment, the signal enhancing equipment can include：
Pull-up circuit 201, pull-down circuit 202, rectification circuit 203 and accumulator 204；
Pull-up circuit 201 is connected with the A ends of RS-485 communication bus and accumulator 204 respectively；
Pull-down circuit 202 is connected with the B ends of RS-485 communication bus and accumulator 204 respectively；
The A ends respectively with RS-485 communication bus of rectification circuit 203, the B ends of RS-485 communication bus and the energy storage
Circuit 204 is connected；
RS-485 communication bus can be charged by rectification circuit 203 to accumulator 204；Accumulator 204 can lead to
Pull-up circuit 201 and pull-down circuit 202 are crossed to RS-485 communication bus input currents.
The signal enhancing equipment being applied in RS-485 communication systems that the present invention is provided, equipment is filled not comprising power supply in itself
Put, by rectification circuit, RS-485 communication bus can charge when fan-out capability is very strong to accumulator, and at this moment RS-485 leads to
Letter node is likely to be at output state；When RS-485 communication bus fan-out capability is not enough, can be noted to RS-485 communication bus
Enter electric current, to provide driving current.Therefore can be provided to RS-485 communication bus by the signal enhancing equipment and drive electricity
Stream, effectively compensate for the problem that signal is decayed in communication node, so as to improve the communication capacity of RS-485 communication bus.
RS-485 communication bus can be charged by rectification circuit 203 to accumulator 204, can be included：
When any one RS-485 communication node is output state, can be filled to accumulator 204 by rectification circuit 203
Electricity；
Any one RS-485 communication node be input state or high-impedance state when, can by pull-up circuit 201 with
And pull-down circuit 202 to 203 to RS-485 communication bus input currents.
Common rectifier system can here provide a kind of rectified current using the circuit realiration with diode or triode
Road can realize technique effect of the invention, be also to realize a kind of tandem circuit that can realize the effect of the invention, such as Fig. 3
It is shown：
Rectification circuit includes the first diode D1 and the second diode D2；
First diode D1 is connected in parallel on the two ends of the pull-up circuit 201；
The positive pole of the first diode D1 is connected with the A ends of the RS-485 communication bus；
Second diode D2 is connected in parallel on the two ends of the pull-down circuit 202；
The negative pole of the second diode D2 is connected with the B ends of the RS-485 communication bus.
The Position Design of two diodes is a kind of cleverly stealing circuit in the rectification circuit, in RS-485 communications
When node output current is very capable, electric current by two diodes, can realize energy storage, in bus to accumulator respectively
When communication signal transmissions ability is weaker, the electric energy release of accumulator storage, electric current can inject RS-485 by upper pull-down circuit
Communication bus.
Signal enhancing equipment described in Fig. 3, can be the voltage and RS485 communication bus at the A ends of RS485 communication bus
B terminal voltages pressure difference, the pressure drop sum of the charging circuit constituted higher than accumulator and diode can be by two two poles
Pipe charges to accumulator.
In another signal enhancing equipment as shown in Figure 4, there is provided the alternatively possible implementation of rectification circuit：
Rectification circuit includes the 3rd diode D3 and the 4th diode D4；
The positive pole of the 3rd diode D3 is connected with the second end with accumulator；The A ends of negative pole and RS-485 communication bus
Connection；
The negative pole of the 4th diode D4 is connected with the first end of accumulator；Negative pole connects the B ends of RS-485 communication bus
Connection.
Pull-up circuit 201 is connected with the A ends of RS-485 communication bus and the first end of accumulator 204 respectively；
Pull-down circuit 202 is connected with the B ends of RS-485 communication bus and the second end of accumulator 204 respectively；
When RS-485 communication node output currents are very capable, electric current, can be to energy storage respectively by two diodes
Circuit realiration energy storage, when the communication signal transmissions ability of bus is weaker, the electric energy release of accumulator storage, electric current can pass through
Upper pull-down circuit injects RS-485 communication bus.
Signal enhancing equipment described in Fig. 4, can be the voltage and RS485 communication bus at the B ends of RS485 communication bus
A terminal voltages pressure difference, the pressure drop sum of the charging circuit constituted higher than accumulator and diode can be by two two poles
Pipe charges to accumulator.
In order to realize more preferable rectification effect, rectification circuit 203 can be further designed to：
As shown in figure 5, rectification circuit 203 includes the first diode D1, the second diode D2, the 3rd diode D3 and the
Four diode D4；
The positive pole of the first diode D1 respectively with the A ends of the RS-485 communication bus and the 3rd diode D3
Negative pole is connected, and negative pole is connected with the first end of the accumulator 204；
The positive pole of the 3rd diode D3 is connected with the second end of the accumulator 204；
The positive pole of the second diode D2 is connected with the second end of the accumulator 204, and negative pole communicates with RS-485 respectively
The positive pole of the B ends of bus and the 4th diode D4 is connected；
The negative pole of the 4th diode is connected with the first end of the accumulator 204；
Wherein, the connection end of corresponding pull-up circuit 201 and pull-down circuit 202 and accumulator 201 also will relative to
It is designed as：
Pull-up circuit 201 is connected with the first end of the accumulator 204 and the A ends of RS-485 communication bus respectively；
Pull-down circuit 202 is connected with the second end of the accumulator 204 and the B ends of RS-485 communication bus respectively.
By the embodiment of Fig. 5, the rectification circuit of four diodes is better assured that on the one the second diode bases
On, more preferable rectification effect is obtained in that, further ensuring the electric current under different output modes has the flow direction for determining.
Electric capacity is a kind of very effective accumulator in the circuit of this small element, and its own charge and discharge for having
Electricity characteristic very effective can meet the above embodiment of the present invention required for charge-discharge power demand, so, accumulator can
To be designed to be made up of electric capacity, but the design of accumulator also has other various according to other common technology means of this area
Scheme, a kind of only preferred scheme is made up of electric capacity.
Further, accumulator can be made up of N number of electric capacity being connected in series, wherein, N is whole more than or equal to 1
Number.
In order to realize pull-up or drop-down function, it is ensured that in accumulator, when 1 output circuit is output as, can
Ensure the output end clamper of accumulator in high level or low level, and play metering function, can generally use upper drop-down
Resistance is realized.
Then the pull-up circuit in above-mentioned equipment is first resistor R1, and pull-down circuit is second resistance R2.
Specifically, as shown in fig. 6, as a example by upper pull down resistor is applied in the equipment such as Fig. 3 as upper pull-down circuit,
The apparatus embodiments include：
First resistor R1 is connected with the A ends of RS-485 communication bus and accumulator respectively；
Second resistance R2 is connected with the B ends of RS-485 communication bus and accumulator respectively；
First diode D1 is connected in parallel on the two ends of the first resistor；
The positive pole of the first diode D1 is connected with the A ends of the RS-485 communication bus；
Second diode D2 is connected in parallel on the two ends of the second resistance；
The negative pole of the second diode D2 is connected with the B ends of the RS-485 communication bus.
When RS-485 communication bus fan-out capabilities are enough, because the rectification circuit that the first and second diodes are constituted is deposited
RS-485 communication bus can be charged by the two diodes to the accumulator；Needed in RS-485 communication bus
During Injection Current, accumulator is to illustrate electric energy stored by electric capacity C1 by the first resistor and second resistance to described
RS-485 communication bus output currents.
It has been mentioned that accumulator can be made up of electric capacity in previous embodiment, so the accumulator in Fig. 5 is
A situation of electric capacity C1 is reduced to, but it should be recognized that never only being limited in the accumulator met needed for realizing the present invention
In this kind of scheme, it is illustrated that scheme is intended merely to clearly show this embodiment, accumulator for electric capacity can be with herein
Replace with other accumulators that can realize charge-discharge power demand.
As shown in fig. 7, as a example by upper pull down resistor is applied in the equipment such as Fig. 4 as upper pull-down circuit, the equipment
Embodiment includes：
First resistor R1 is connected with the A ends of RS-485 communication bus and accumulator respectively；
Second resistance R2 is connected with the B ends of RS-485 communication bus and accumulator respectively；
The second end connection of the positive pole accumulator of the 3rd diode D3；Negative pole is connected with the A ends of RS-485 communication bus；
The negative pole of the 4th diode D4 is connected with the first end of accumulator, and negative pole connects with the B ends of RS-485 communication bus
Connect；
First resistor R1 is connected with the A ends of RS-485 communication bus and the first end of accumulator respectively；
Second resistance R2 is connected with the B ends of RS-485 communication bus and the second end of accumulator respectively.
In Fig. 7, accumulator is an electric capacity C1, and the present invention is not limited and this certainly.
As shown in figure 8, so that upper pull down resistor is applied in the equipment such as Fig. 5 as upper pull-down circuit, the equipment can be with
Including：
First resistor R1 is connected with the first end of accumulator and the A ends of RS-485 communication bus respectively；
Second resistance R2 is connected with the second end of accumulator and the B ends of RS-485 communication bus respectively.
The positive pole of the first diode D2 A ends respectively with the RS-485 communication bus and the negative pole phase of the 3rd diode
Even, negative pole is connected with the first end of accumulator；
The positive pole of the 3rd diode D3 is connected with the second end of accumulator；
The positive pole of the second diode D3 is connected with the second end of accumulator, negative pole respectively with the B of RS-485 communication bus
The positive pole of end and the 4th diode D4 is connected；
The negative pole of the 4th diode D4 is connected with the first end of accumulator.
When RS-485 communication bus fan-out capabilities are enough, due to the presence of the rectification circuit that four diodes are constituted, RS-
485 communication bus i.e. can be to by this first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4
The accumulator charges.
Can be specifically the pressure difference of the voltage at the A ends of RS485 communication bus and the B terminal voltages of RS485 communication bus,
The pressure drop sum of the charging circuit constituted higher than accumulator and diode, can be by the first diode D1 and the second diode
D2 charges to accumulator.
In the pressure difference of the A terminal voltages of the voltage and RS485 communication bus at the B ends of RS485 communication bus, higher than accumulator
The pressure drop sum of the charging circuit constituted with diode, can be by the 3rd diode D3 and the 4th diode D4 to accumulator
Charge.
In RS-485 bus requirements Injection Currents, accumulator is to illustrate electric energy stored by electric capacity C1 by described the
One resistance R1 and second resistance R2 is to the RS-485 communication bus output current.
Pull-up circuit is first resistor R1, and pull-down circuit be second resistance R2 be merely possible to it is a kind of illustrate will pull-up it is electric
Road and pull-down circuit are applied to the result of Fig. 3~Fig. 5, and the program can apply in the present invention in other embodiment, to other
Embodiment is used as further supplement.
In addition, by resistance as a kind of common approach for realizing the upper drop-down scheme that clamper is carried out to level, the present invention
The pull-up circuit of offer is first resistor, and pull-down circuit is only that a kind of can realize upper drop-down effect more for second resistance
Easy preferred scheme, without creative efforts, by pull-up circuit in the above embodiment of the present invention with
Puller circuit is designed as other common schemes of this area, it should also be considered as protection scope of the present invention.
For Fig. 6~embodiment illustrated in fig. 8, the resistance data that a kind of dependence experience draws specifically are provided here, typically
, first resistor R1 and second resistance R2 can be 1k Ω；The size of resistance here determines that accumulator is total to communication
The ability of line Injection Current, the size of 1k Ω is in the device, can to realize that this equipment needs the one of technique effect of realization
Resistance is planted, the resistance of R1, R2 can also be other effectively resistances.
Equally, for relying on empirically, it is made up of N number of electric capacity being connected in series in above-mentioned accumulator, wherein electric capacity
Capacitance can be 1 μ F, 1 μ F here are also directed to RS-485 communication systems can realize the invention equipment effect one
Plant preferred scheme.
For above-mentioned all of signal enhancing equipment, by it to be applied to RS-485 communication systems, can obtain above-mentioned
Technique effect, can significantly improve the communication capacity of this communication system, and the other parts of RS-485 communication systems are referred to now
There is technology, it is not reinflated herein.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or uses the present invention.
Various modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, the present invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The scope most wide for causing.
Claims (8)
1. a kind of signal enhancing equipment being applied in RS-485 communication systems, the communication system includes that being connected to RS-485 leads to
Multiple RS-485 communication nodes in letter bus, the RS-485 communication bus uses Double wire transmission, each RS-485 communications
Node is respectively connecting to the A ends and B ends of the RS-485 communication bus, it is characterised in that the signal enhancing equipment includes：
Pull-up circuit, pull-down circuit, rectification circuit and accumulator；
The pull-up circuit is connected with the A ends of the RS-485 communication bus and the accumulator respectively；
The pull-down circuit is connected with the B ends of the RS-485 communication bus and the accumulator respectively；
Rectification circuit A ends respectively with the RS-485 communication bus, B ends of the RS-485 communication bus and described
Accumulator is connected；
The RS-485 communication bus can be charged by the rectification circuit to the accumulator；The accumulator can
By the pull-up circuit and pull-down circuit to the RS-485 communication bus output current.
2. equipment according to claim 1, it is characterised in that the rectification circuit includes the first diode and the two or two
Pole pipe；
First diodes in parallel is at the two ends of the pull-up circuit；
The positive pole of first diode is connected with the A ends of the RS-485 communication bus；
Second diodes in parallel is at the two ends of the pull-down circuit；
The negative pole of second diode is connected with the B ends of the RS-485 communication bus.
3. equipment according to claim 1, it is characterised in that the rectification circuit includes the first diode, the two or two pole
Pipe, the 3rd diode and the 4th diode；
The positive pole of first diode A ends respectively with the RS-485 communication bus and the negative pole of the 3rd diode
It is connected, negative pole is connected with the first end of the accumulator；
The positive pole of the 3rd diode is connected with the second end of the accumulator；
The positive pole of second diode is connected with the second end of the accumulator, and negative pole communicates always with the RS-485 respectively
The positive pole of the B ends of line and the 4th diode is connected；
The negative pole of the 4th diode is connected with the first end of the accumulator；
Wherein, the pull-up circuit respectively with the first end and the A ends phase of the RS-485 communication bus of the accumulator
Even；
The pull-down circuit is connected with the second end of the accumulator and the B ends of the RS-485 communication bus respectively.
4. the equipment according to any one of claims 1 to 3, it is characterised in that the accumulator is connected in series by N number of
Electric capacity is constituted, wherein, N is the integer more than or equal to 1.
5. the equipment according to any one of claims 1 to 3, it is characterised in that the pull-up circuit is first resistor, described
Pull-down circuit is second resistance.
6. equipment according to claim 5, it is characterised in that the first resistor and the second resistance are respectively 1
Kilo-ohm.
7. equipment according to claim 4, it is characterised in that the capacitance of the electric capacity is 1 microfarad.
8. a kind of RS-485 communication systems, it is characterised in that the multiple RS-485 including being connected on RS-485 communication bus lead to
Letter node and the signal enhancing equipment as described in any one of claim 1~7.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110011832A (en) * | 2009-07-29 | 2011-02-09 | 주식회사 하이닉스반도체 | Senseamp and driving method of the same |
| CN202085134U (en) * | 2011-06-02 | 2011-12-21 | 光一科技股份有限公司 | RS-485 circuit amplifier |
| CN202550527U (en) * | 2012-03-08 | 2012-11-21 | 郭源生 | Special driver 485 communication circuit for intelligent motor |
| CN103092706A (en) * | 2012-11-19 | 2013-05-08 | 安徽华夏显示技术有限公司 | Automatic data transmission fault masking method for 485 bus system |
| CN203492025U (en) * | 2013-08-30 | 2014-03-19 | 智捷科技股份有限公司 | Wireless signal enhancement device and wireless signal enhancement system |
| CN103716031A (en) * | 2013-05-21 | 2014-04-09 | 深圳市汇春科技有限公司 | Non-polarity RS485 interface circuit conversion rate enhancement method and circuit |
| CN204101631U (en) * | 2014-09-12 | 2015-01-14 | 安徽南瑞中天电力电子有限公司 | Electric energy meter 485 communication improves circuit |
| CN204117139U (en) * | 2014-09-04 | 2015-01-21 | 特变电工西安电气科技有限公司 | The directional control circuit of a kind of RS485 |
| CN204539134U (en) * | 2015-01-28 | 2015-08-05 | 国家电网公司 | Signal strengthens equipment and RS-485 communication system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10146732B2 (en) * | 2013-01-22 | 2018-12-04 | Apple Inc. | Time-division multiplexed data bus interface |
-
2015
- 2015-01-28 CN CN201510043588.3A patent/CN104579419B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110011832A (en) * | 2009-07-29 | 2011-02-09 | 주식회사 하이닉스반도체 | Senseamp and driving method of the same |
| CN202085134U (en) * | 2011-06-02 | 2011-12-21 | 光一科技股份有限公司 | RS-485 circuit amplifier |
| CN202550527U (en) * | 2012-03-08 | 2012-11-21 | 郭源生 | Special driver 485 communication circuit for intelligent motor |
| CN103092706A (en) * | 2012-11-19 | 2013-05-08 | 安徽华夏显示技术有限公司 | Automatic data transmission fault masking method for 485 bus system |
| CN103716031A (en) * | 2013-05-21 | 2014-04-09 | 深圳市汇春科技有限公司 | Non-polarity RS485 interface circuit conversion rate enhancement method and circuit |
| CN203492025U (en) * | 2013-08-30 | 2014-03-19 | 智捷科技股份有限公司 | Wireless signal enhancement device and wireless signal enhancement system |
| CN204117139U (en) * | 2014-09-04 | 2015-01-21 | 特变电工西安电气科技有限公司 | The directional control circuit of a kind of RS485 |
| CN204101631U (en) * | 2014-09-12 | 2015-01-14 | 安徽南瑞中天电力电子有限公司 | Electric energy meter 485 communication improves circuit |
| CN204539134U (en) * | 2015-01-28 | 2015-08-05 | 国家电网公司 | Signal strengthens equipment and RS-485 communication system |
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| CN104579419A (en) | 2015-04-29 |
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