CN206878840U - A kind of USB turns RS485 communication adapters - Google Patents
A kind of USB turns RS485 communication adapters Download PDFInfo
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- CN206878840U CN206878840U CN201720610329.9U CN201720610329U CN206878840U CN 206878840 U CN206878840 U CN 206878840U CN 201720610329 U CN201720610329 U CN 201720610329U CN 206878840 U CN206878840 U CN 206878840U
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Abstract
The utility model discloses a kind of USB to turn RS485 communication adapters, including usb communication module, optical coupling module, RS485 communication modules, wherein：Usb communication module is connected with optical coupling module, for receiving the data of PC transmissions；And sent after converting the data into the data of RS485 information stream format to optical coupling module；Receive optical coupling module and send the data of RS485 information stream format, and sent after converting the data into the data of usb data form to PC；Optical coupling module is connected between usb communication module and RS485 communication modules, for isolating to usb communication module with RS485 communication modules；RS485 communication modules are connected with optical coupling module, the data that optical coupling module is sent for receiving；And send to the slave station equipment in RS485 buses；Wherein, the first supply voltage of RS485 communication modules is the supply voltage of the slave station equipment in RS485 buses.
Description
Technical field
Communication technical field is the utility model is related to, more particularly to a kind of USB turns RS485 communication adapters.
Background technology
RS485 bussing techniques are due to the powerful fault-tolerant ability of its differential signal, the bus driver ability more than 200 slave stations
And abundant integrated device range of choice and be widely used in industry control automation with instrument teletransmission industry.PC
, it is necessary to use RS485 main websites hardware when (Personal Computer, PC) is as the host computer for driving RS485 buses
To realize the progress wire communication of the slave station for all kinds of software and the RS485 buses run on PC, the RS485 master commonly used in the market
Hardware of standing includes the built-in plate of PCI (Peripheral Component Interconnect, periphery original paper expansion interface) slot
The external adapter of card adapter and USB (Universal Serial Bus, USB) interface, wherein, USB interface
External adapter can with tablet personal computer, notebook computer etc. can not expanding built-in board PC phases it is compatible, its application is more
Extensively.
At present remote transmission instrument using RS485 buses carry out wired data transfer when, it is necessary to be RS485 by external power supply
Wire communication module is powered, then by Phototube Coupling by RS485 wire communication modules and the MCU of remote transmission instrument
(Microcontroller Unit, micro-control unit) is connected, and RS485 wire communication modules and teletransmission are realized by isolating device
Signal transmission between the MCU of instrument, and the power line of a set of remote transmitting system is typically all to be connected on same dc source,
Therefore, the RS485 wire communication modules of all remote transmission instruments in a set of remote transmitting system are in same potential reference system.
However, the external adapter of common USB interface is driven from USB side draws electricity in the market, wherein greatly
The design of amount is that directly USB sides and the potential reference system of RS485 sides two parts circuit are coupled, when PC is supplied using battery
When electric, if electrical potential difference between its battery power supply system and the power supply system of DC source of RS485 buses be present, gently it can then cause
Communicate unstable or even can not communicate, it is heavy then circuit can be damaged, added even between USB sides and RS485 sides two parts circuit
Isolate power taking, also only can guarantee that between RS485 buses and PC electric power system to be not in direct electrical potential difference and current path,
And do not ensure that the instrument slave station module in RS485 lateral circuits and whole RS485 buses in USB main websites hardware and be in same
In individual potential reference system.
Utility model content
The utility model provides a kind of USB and turns RS485 communication adapters, to solve remote transmission instrument using RS485
Bus carry out wired data transfer when, between all main websites and slave station of RS485 buses not in same potential reference system and
It is caused to communicate the problem of unstable.
The utility model embodiment provides a kind of USB and turns RS485 communication adapters, including：
Usb communication module, optical coupling module, RS485 communication modules, wherein：
The usb communication module, is connected with the optical coupling module, for receiving the first data of PC transmissions；And by described in
First data conversion is sent to the optical coupling module into after the second data of RS485 information stream format；And receive the optocoupler
The 3rd data that module is sent, and the 3rd data conversion is sent to the PC into after the 4th data of usb data form；
The optical coupling module, it is connected between the usb communication module and the RS485 communication modules, for described
Usb communication module is isolated with the RS485 communication modules；And transmission second data and the 3rd data；
The RS485 communication modules, are connected with the optical coupling module, for receive that the optical coupling module sends described the
Two data；And second data are sent to the slave station equipment in RS485 buses；And the 3rd data are sent to described
Optical coupling module；Wherein, the 3rd data are that the slave station equipment in the RS485 buses is sent to the RS485 communication modules
's；
Wherein, the first supply voltage of the RS485 communication modules is the power supply of the slave station equipment in the RS485 buses
Voltage.
The beneficial effects of the utility model include：
USB provided by the utility model turns RS485 communication adapters, leads to comprising usb communication module, optical coupling module, RS485
Believe the several parts of module, usb communication module is connected with optical coupling module one end, receives the data for the USB format that PC is sent, and will
The data conversion of the USB format into sending after the data of RS485 information stream format to optical coupling module, the other end of optical coupling module with
RS485 communication modules are connected, and the data of the RS485 information stream format after conversion are sent to RS485 communication moulds by optical coupling module
Block, RS485 communication modules receive the data, and the slave station equipment sent the data in RS485 buses, RS485 communication moulds
Block sends the data that the slave station equipment in RS485 buses returns to optical coupling module, and optical coupling module sends the data to USB
Communication module, usb communication module is again by the data conversion of the RS485 information stream format into sending after the data of usb data form
To PC, the communication between RS485 main websites and slave station equipment is completed, wherein, RS485 communication modules are set with the slave station in RS485 buses
It is standby to use same supply voltage, so that same potential reference system is shared with slave station by the main website in RS485 buses, it is ensured that all
Potential between RS485 equipment is in same level, prevent due to RS485 buses by different potential regions and caused by it is same
Absolute potential in one RS485 buses between distinct device is more than communication caused by the absolute potential scope of RS485 bus protocolses
The problem of unstable.
Other features and advantages of the utility model will illustrate in the following description, also, partly from specification
In become apparent, or understood by implementing the utility model.The purpose of this utility model and other advantages can pass through
Specifically noted structure is realized and obtained in the specification, claims and accompanying drawing write.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding to of the present utility model, forms one of the present utility model
Point, schematic description and description of the present utility model is used to explain the utility model, does not form to of the present utility model
Improper restriction.In the accompanying drawings：
Fig. 1 is that USB turns the application scenarios schematic diagram of RS485 communication adapters in the utility model embodiment；
Fig. 2 is that USB turns the structural representation of RS485 communication adapters in the utility model embodiment.
Embodiment
In order to solve remote transmission instrument when carrying out wired data transfer using RS485 buses, all main websites of RS485 buses
Between slave station not in same potential reference system caused by communicate the problem of unstable, the utility model embodiment provide
A kind of USB turns RS485 communication adapters.
The USB that the utility model embodiment provides turns the implementation principles of RS485 communication adapters：Include usb communication mould
Block, optical coupling module, the several parts of RS485 communication modules, usb communication module are connected with optical coupling module one end, receive PC and send
USB format data, and the data conversion of the USB format is sent to optocoupler mould into after the data of RS485 information stream format
Block, the other end of optical coupling module are connected with RS485 communication modules, and optical coupling module is by the RS485 information stream format after conversion
Data are sent to RS485 communication modules, and RS485 communication modules receive the data, and send the data in RS485 buses
Slave station equipment, RS485 communication modules send the data that the slave station equipment in RS485 buses returns to optical coupling module, optocoupler
Module sends the data to usb communication module, and usb communication module is again by the data conversion of the RS485 information stream format into USB
Be sent to PC after the data of data format, complete the communication between RS485 main websites and slave station equipment, wherein, RS485 communication modules with
Slave station equipment in RS485 buses uses same supply voltage so that the main website in RS485 buses shared with slave station it is same
Potential reference system, it is ensured that the potential between all RS485 equipment is in same level, prevents because RS485 buses are by different
Potential region and caused by absolute potential in same RS485 buses between distinct device it is absolute more than RS485 bus protocolses
The problem of communication is unstable caused by potential range.
Preferred embodiment of the present utility model is illustrated below in conjunction with Figure of description, it will be appreciated that retouch in this place
The preferred embodiment stated is merely to illustrate and explained the utility model, is not used to limit the utility model, and do not conflicting
In the case of, the feature in embodiment and embodiment in the utility model can be mutually combined.
Show as shown in figure 1, it turns the application scenarios of RS485 communication adapters for the USB that the utility model embodiment provides
It is intended to, USB turns RS485 communication adapters 14 and includes usb communication module 141, optical coupling module 142 and RS485 communication modules 143,
Wherein, optical coupling module 142 comprises at least two photoelectrical couplers, and optical coupling module 142 is connected to usb communication module 141 and RS485
Between communication module 143, enter for the supply voltage to usb communication module 141 and the supply voltage of RS485 communication modules 143
Row electrical isolation, usb communication module 141 transmit data, USB with RS485 communication modules 143 using asynchronous serial communication mode
Bus 19 is divided into inactive state with sending state two states with RS485 buses 110, represents 0 and 1 two kind of logic shape respectively
State, by the switching of logic state, by each byte of data according to start bit, data bit, check bit, the order of stop position one
Individual one position in position is sent.USB turns the data that RS485 communication adapters 14 receive the USB format that PC13 is sent, and should
The data conversion of USB format is transferred to the slave station equipment 16 in RS485 buses 110 into the data of RS485 information stream format,
Slave station equipment 16 in RS485 buses 110 then uses opposite process when transmitting data to PC13.Specifically, usb communication module
After 141 receive the data for the USB format that PC13 is sent by usb bus 19, RS485 information stream format is converted the data into
After data, the data of the RS485 information stream format after conversion are sent to RS485 communication modules 143 by optical coupling module 142,
The slave station equipment 16 that RS485 communication modules 143 are sent the data in RS485 buses 110 by RS485 buses 110,
Slave station equipment 16 in RS485 buses 110 sends the data of RS485 information stream format to RS485 communication modules 143, RS485
Communication module 143 is sending the data to usb communication module 141 by optical coupling module 142, and usb communication module 141 should
The data conversion of RS485 information stream format is completed in PC13 and RS485 buses 110 into transmission after the data of USB format to PC13
Slave station equipment 16 between communication.Wherein, PC13 is that USB turns the usb communication modules 141 of RS485 communication adapters 14 and powered,
Supply voltage is that+5V, PC13 and USB turn the usb communication modules of RS485 communication adapters 14 to be in PC power source potential reference are 11
In, and USB turns the RS485 communication modules of RS485 communication adapters 14 and the slave station equipment 15 in RS485 buses 110 uses phase
With power supply 18, supply voltage be+12V so that USB turn RS485 communication adapters 14 RS485 communication modules 143 and
It is in 12 that slave station equipment 16 in RS485 buses 110, which is in the same system power supply potential reference of electrical source voltage referential 485,.
In the utility model embodiment, PC13 can control RS485 buses as the master device in RS485 buses 110
Slave station equipment 16 on 110, the quantity of slave station equipment 16 can be 1~128, can be remote transmission instrument etc., not limit herein
It is fixed.
With reference to Fig. 1 application scenarios, it is described with reference to Figure 2 and is turned according to the USB of the utility model exemplary embodiment
RS485 communication adapters.It should be noted that above-mentioned application scenarios be only easy for understanding spirit and principle of the present utility model and
Show, the utility model is unrestricted in this regard.On the contrary, the utility model can apply to applicable any scene.
The USB that the utility model exemplary embodiment provides turns RS485 communication adapters and can apply to remote transmission instrument system
In system.As shown in Fig. 2 it is the structural representation that USB provided by the utility model turns RS485 communication adapters, can include：
Usb communication module 21, optical coupling module 22, RS485 communication modules 23, wherein：
The usb communication module, is connected with the optical coupling module, for receiving the first data of PC transmissions；And by described in
First data conversion is sent to the optical coupling module into after the second data of RS485 information stream format；And receive the optocoupler
The 3rd data that module is sent, and the 3rd data conversion is sent to the PC into after the 4th data of usb data form.
The optical coupling module, it is connected between the usb communication module and the RS485 communication modules, for described
Usb communication module is isolated with the RS485 communication modules；And transmission second data and the 3rd data.
The RS485 communication modules, are connected with the optical coupling module, for receive that the optical coupling module sends described the
Two data；And second data are sent to the slave station equipment in RS485 buses；And the 3rd data are sent to described
Optical coupling module；Wherein, the 3rd data are that the slave station equipment in the RS485 buses is sent to the RS485 communication modules
's.
Wherein, the first supply voltage of the RS485 communication modules is the power supply of the slave station equipment in the RS485 buses
Voltage.
When it is implemented, USB, which turns RS485 communication adapters, also includes USB interface, usb communication module includes USB UART
Chip, usb communication module be specifically used for by USB interface receive PC transmission the first data, and by the first data conversion into
Sent after second data of RS485 information stream format by the transmitting terminal of USB UART chips to optical coupling module, and pass through USB
The receiving terminal of UART chip receives the 3rd data that optical coupling module is sent, and the 3rd data are sent to described by USB interface
PC.Specifically, the conversion and biography that USB UART chips are used between the data of USB format and the data of RS485 information stream format
It is defeated, wherein, the first data, the 4th data are the data of USB format, and the second data, the 3rd data are RS485 information flow lattice
The data of formula.
When it is implemented, USB, which turns RS485 communication adapters, also includes power interface, RS485 communication modules include RS485
Chip and power conversion chip, wherein, power conversion chip, for the first supply voltage conversion that will be received by power interface
Into the second supply voltage, and the input voltage using the second supply voltage as RS485 chips.Specifically, the first supply voltage for+
Slave station equipment on 12V, with RS485 buses shares same power supply, by power conversion chip should+12V voltage conversions for+
5V, and be RS485 chip power supplies as the input voltage of RS485 chips.
When it is implemented, USB, which turns RS485 communication adapters, also includes RS485 EBIs, RS485 communication modules are used for
The first signal wire and the secondary signal line of RS485 buses are connected by RS485 EBIs, wherein, first signal wire with
First resistor is connected between secondary signal line；First signal wire series connection second resistance, secondary signal line series connection 3rd resistor, first
Connected between resistance and second resistance and 3rd resistor.Specifically, rRS485 buses are sent and differential received mode using balance
Realize communication：Transmitting terminal by the Transistor-Transistor Logic level signal of serial port be converted into differential signal A, B two-way output, by cable transmission it
Differential signal is reduced into Transistor-Transistor Logic level signal in receiving terminal afterwards.Above-mentioned first signal wire be RS485 buses A lines, secondary signal
Line is the B lines of RS485 buses.First resistor is the pull-up resistor of RS485 modules, and second resistance is load resistance, 3rd resistor
For the pull down resistor of RS485 modules, pull-up resistor, the load resistance of RS485 modules connect to form RS485 buses with pull down resistor
A lines, a static partial pressure present on B lines, and after access load is such as remote transmission instrument on A, B line, remote transmission instrument is
Slave station equipment in RS485 buses, second resistance load resistance is in parallel with the input impedance of remote transmission instrument, causes the quiet of A, B line
State bias changes, if parameter setting is improper, or is not present load resistance (second resistance) in RS485 modules, works as RS485
When remote transmission instrument number in bus becomes 200 by 1, remote transmission instrument resistance in parallel becomes 1/200 so that A, B line it
Between static bias voltage diminish, 200mV 485 technical requirements may not reached.And the utility model embodiment is added and born
After carrying resistance, the resistance of load resistance is arranged to the small several magnitudes of resistance than RS485 bus slave station equipments, even if then in parallel
200 slave station equipments, its equivalent resistance are also controlled by the size of load resistance so that are set in RS485 buses comprising different slave stations
When standby, the resistance substantially constant between A, B line, then appropriate pull-up resistor and pull down resistor are taken, so that between A, B line
Static bias voltage keeps stable, and is not influenceed by the slave station equipment number connected.Wherein, pull-up resistor, pull down resistor and
The value of load resistance is configured according to practical application, is not construed as limiting herein.
Specifically, optical coupling module is used to supply the 3rd supply voltage of usb communication module and the first of RS485 communication modules
Piezoelectric voltage, the second supply voltage are isolated, wherein, the 3rd supply voltage of usb communication module is the voltage that PC is provided, for+
5V.Optical coupling module comprises at least the first photoelectrical coupler and the second photoelectrical coupler, the first photoelectrical coupler and the second photoelectricity coupling
Clutch is in parallel, the transmitting terminal of the first end connection USB UART chips of the first photoelectrical coupler, and the second of the first photoelectrical coupler
The transmitting terminal of end connection RS485 chips, the receiving terminal of the first end connection USB UART chips of the second photoelectrical coupler, the second light
The receiving terminal of the second end connection RS485 chips of electric coupler.Wherein, the first photoelectrical coupler and the second photoelectrical coupler can be with
Using TLP181 type photoelectrical couplers.
When it is implemented, USB turns the data that RS485 communication adapters 14 receive the USB format that PC13 is sent, and should
The data conversion of USB format is transferred to the slave station equipment 16 in RS485 buses 110 into the data of RS485 information stream format,
Slave station equipment 16 in RS485 buses 110 then uses opposite process when transmitting data to PC13.Usb communication module and RS485
Communication module transmits data using asynchronous serial communication mode, clock signal, and usb bus and RS485 buses neither be present
Inactive state is divided into sending state two states, 0 and 1 two kind of logic state is represented respectively, passes through logic state 0 and 1
Switching, the transmission by each byte of data according to start bit, data bit, check bit, one position of the order of stop position, one position
Go out.Specifically, usb bus and RS485 buses use differential signal, during inactive state, the transmitting terminal of USB UART chips
TX exports high level, the receiving terminal RX of the receiving terminal RX of RS485 chips to USB UART chips to the transmitting terminal TX of RS485 chips
Export high level, now, the voltage V on the A lines of RS485 busesaMore than the voltage V on B linesb, i.e. Va＞ Vb, USB positive voltage numbers
According to the voltage V on lineUSBDPMore than the voltage V on USB negative voltage data linesUSBDM, the transmitting terminal TX of USB UART chips is by USB
Bus marco, the receiving terminal RX of RS485 chips is by RS485 bus marcos.It is first when PC sends 1 data to RS485 buses
First, VUSBDM＞ VUSBDPAnd the time span of 1 is kept, the differential signal is after the identification of USB UART chips, USB UART cores
The transmitting terminal TX output low levels of piece, are transmitted to transmitting terminal TX, the RS485 chip of RS485 chips by the first photoelectrical coupler
After identifying TX low levels so that Vb＞ Va, the electrical potential difference between the A lines of RS485 buses, B lines sends upset.When RS485 buses to
When PC sends 1 data, principle is same as described above, in the opposite direction, Vb＞ VaAnd the time span of 1 is kept, differential signal warp
After crossing the identification of RS485 chips, the receiving terminal RX output low levels of RS485 chips, transmitted by the second photoelectrical coupler to USB
After its receiving terminal RX of receiving terminal RX, USB the UART chip identification of UART chip low level so that VUSBDM＞ VUSBDP, USB
Electrical potential difference between positive voltage data wire USBDP and negative voltage data line USBDM in bus sends upset.
The utility model embodiment provide USB turn RS485 communication adapters include usb communication module, optical coupling module,
The several parts of RS485 communication modules, usb communication module are connected with optical coupling module one end, receive the number for the USB format that PC is sent
According to, and by the data conversion of the USB format into sending after the data of RS485 information stream format to optical coupling module, optical coupling module
The other end is connected with RS485 communication modules, and the data of the RS485 information stream format after conversion are sent to by optical coupling module
RS485 communication modules, RS485 communication modules receive the data, and the slave station equipment sent the data in RS485 buses,
RS485 communication modules send the data that the slave station equipment in RS485 buses returns to optical coupling module, and optical coupling module counts this
According to sending to usb communication module, usb communication module is again by the data conversion of the RS485 information stream format into usb data form
PC is sent to after data, completes the communication between RS485 main websites and slave station equipment, wherein, RS485 communication modules and RS485 buses
On slave station equipment use same supply voltage so that the main website in RS485 buses and slave station share same potential reference
System, it is ensured that the potential between all RS485 equipment is in same level, prevents because RS485 buses pass through different potential areas
Domain and caused by absolute potential in same RS485 buses between distinct device more than RS485 bus protocolses absolute potential scope
Caused by communication it is unstable the problem of.Also, RS485 communication modules add a load between A, B line of RS485 buses
Resistance, and the resistance of load resistance is arranged to the small several magnitudes of resistance than RS485 bus slave station equipments so that RS485 is total
When different slave station equipments are included on line, the resistance substantially constant between A, B line, then take appropriate pull-up resistor and drop-down electricity
Resistance, so that the static bias voltage between A, B line keeps stable, and do not influenceed by the slave station equipment number connected.
For convenience of description, above each several part is divided by function describes respectively for each module (or unit).Certainly, exist
Implement the function of each module (or unit) can be realized in same or multiple softwares or hardware during the utility model.
Although having been described for preferred embodiment of the present utility model, those skilled in the art once know substantially
Creative concept, then other change and modification can be made to these embodiments.So appended claims are intended to be construed to wrap
Include preferred embodiment and fall into having altered and changing for the scope of the utility model.
Obviously, those skilled in the art can carry out various changes and modification without departing from this practicality to the utility model
New spirit and scope.So, if these modifications and variations of the present utility model belong to the utility model claims and
Within the scope of its equivalent technologies, then the utility model is also intended to comprising including these changes and modification.
Claims (8)
1. a kind of general-purpose serial bus USB turns RS485 communication adapters, it is characterised in that including usb communication module, optocoupler mould
Block, RS485 communication modules, wherein：
The usb communication module, is connected with the optical coupling module, for receiving the first data of PC PC transmissions；And will
First data conversion is sent to the optical coupling module into after the second data of RS485 information stream format；And described in receiving
The 3rd data that optical coupling module is sent, and the 3rd data conversion is sent to institute into after the 4th data of usb data form
State PC；
The optical coupling module, it is connected between the usb communication module and the RS485 communication modules, for leading to the USB
Letter module is isolated with the RS485 communication modules；And transmission second data and the 3rd data；
The RS485 communication modules, are connected with the optical coupling module, second number sent for receiving the optical coupling module
According to；And second data are sent to the slave station equipment in RS485 buses；And the 3rd data are sent to the optocoupler
Module；Wherein, the 3rd data are that the slave station equipment in the RS485 buses is sent to the RS485 communication modules；
Wherein, the first supply voltage of the RS485 communication modules is the power supply electricity of the slave station equipment in the RS485 buses
Pressure.
2. communication adapter as claimed in claim 1, it is characterised in that also including USB interface；And
The usb communication module includes USB UART Universal Asynchronous Receiver Transmitter USB UART chips；
The usb communication module, the first data specifically for receiving the PC transmissions by the USB interface；And by described in
First data conversion by the transmitting terminal of the USB UART chips into being sent to institute after the second data of RS485 information stream format
State optical coupling module；And the 3rd data of the receiving terminal reception optical coupling module transmission for passing through the USB UART chips, and
By the 3rd data conversion into being sent by the USB interface to the PC after the 4th data of usb data form.
3. communication adapter as claimed in claim 1, it is characterised in that also including power interface；And
The RS485 communication modules include RS485 chips and power conversion chip；
The power conversion chip, for the first supply voltage received by the power interface to be converted into the second power supply electricity
Pressure, the input voltage as the RS485 chips.
4. communication adapter as claimed in claim 1, it is characterised in that also including RS485 EBIs；
The RS485 communication modules, for connecting the first signal wire of the RS485 buses by the RS485 EBIs
With secondary signal line；Wherein, first resistor is connected between first signal wire and the secondary signal line；First signal
Line series connection second resistance, the secondary signal line series connection 3rd resistor；The first resistor and the second resistance and described the
Connected between three resistance.
5. communication adapter as claimed in claim 1, it is characterised in that the 3rd supply voltage of the usb communication module is
What the PC was provided.
6. communication adapter as claimed in claim 1, it is characterised in that
The optical coupling module, specifically for the 3rd supply voltage to the usb communication module and the RS485 communication modules
First supply voltage, the second supply voltage are isolated.
7. communication adapter as claimed in claim 1 or 2, the optical coupling module comprises at least the first photoelectrical coupler and second
Photoelectrical coupler；And
The first end of first photoelectrical coupler connects the transmitting terminal of the USB UART chips, first photoelectrical coupler
The second end connect the transmitting terminals of the RS485 chips；
The first end of second photoelectrical coupler connects the receiving terminal of the USB UART chips, second photoelectrical coupler
The second end connect the receiving terminals of the RS485 chips.
8. communication adapter as claimed in claim 7, it is characterised in that first photoelectrical coupler and second photoelectricity
Coupler uses TLP181 types.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720610329.9U CN206878840U (en) | 2017-05-27 | 2017-05-27 | A kind of USB turns RS485 communication adapters |
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|---|---|---|---|
| CN201720610329.9U CN206878840U (en) | 2017-05-27 | 2017-05-27 | A kind of USB turns RS485 communication adapters |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109086238A (en) * | 2018-07-04 | 2018-12-25 | 山东超越数控电子股份有限公司 | A kind of server serial interface management system and method redirected based on USB |
| CN110119367A (en) * | 2019-06-26 | 2019-08-13 | 荆州市辰霖智能科技有限公司 | USB with isolation turns serial communication equipment |
| CN110958031A (en) * | 2019-12-26 | 2020-04-03 | 上海贝岭股份有限公司 | RS485 receiver circuit, integrated circuit and transceiver |
-
2017
- 2017-05-27 CN CN201720610329.9U patent/CN206878840U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109086238A (en) * | 2018-07-04 | 2018-12-25 | 山东超越数控电子股份有限公司 | A kind of server serial interface management system and method redirected based on USB |
| CN109086238B (en) * | 2018-07-04 | 2022-03-04 | 超越科技股份有限公司 | Server serial port management system and method based on USB redirection |
| CN110119367A (en) * | 2019-06-26 | 2019-08-13 | 荆州市辰霖智能科技有限公司 | USB with isolation turns serial communication equipment |
| CN110958031A (en) * | 2019-12-26 | 2020-04-03 | 上海贝岭股份有限公司 | RS485 receiver circuit, integrated circuit and transceiver |
| CN110958031B (en) * | 2019-12-26 | 2021-05-07 | 上海贝岭股份有限公司 | RS485 receiver circuit, integrated circuit and transceiver |
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