CN2833676Y - Hard-wired HART interface with RS232 and USB dual interface support - Google Patents
Hard-wired HART interface with RS232 and USB dual interface support Download PDFInfo
- Publication number
- CN2833676Y CN2833676Y CNU2005200446470U CN200520044647U CN2833676Y CN 2833676 Y CN2833676 Y CN 2833676Y CN U2005200446470 U CNU2005200446470 U CN U2005200446470U CN 200520044647 U CN200520044647 U CN 200520044647U CN 2833676 Y CN2833676 Y CN 2833676Y
- Authority
- CN
- China
- Prior art keywords
- interface
- hart
- usb
- circuit
- hardware
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The utility model discloses a hardware interconnection type HART interface with RS232 and USB dual interface support, which comprises a hardware interconnection logic circuit, a power supply voltage stabilizing switching circuit, an HART level translator circuit, a shaping and filter circuit, a transformer or a photoelectric isolation circuit, an HART signal modulation and demodulation circuit, an RS232 interface and a USB interface. A system can carry out communication with an HART bus according to the setting and the selection of the RS232 interface or the USB interface, wherein the RS232 interface and the USB interface are connected with the HART signal modulation and demodulation circuit by the hardware interconnection logic circuit; the HART interface after passing through the transformer or the photoelectric isolation circuit, the shaping and filter circuit and the lever translator circuit carries out modulation and demodulation of the HART signals, and realizes bidirectional data interchange with the RS232 interface and the USB interface by the hardware interconnection logic circuit. The utility model can be used for computers with USB interfaces or only with an RS232 interface.
Description
Technical field
The utility model relates to industrial field bus, especially a kind of RS232 and the two interfaces of USB HART interface that is used for industrial field bus.
Background technology
Along with development of computer, USB interface will finally replace the RS232 interface, and this process that substitutes can be more longer than process commercial, the office field in industrial application.In HART fieldbus field, the HART translation interface that independent RS232 or USB have been arranged, but also not only do not possessed RS232 but also possessed the HART interface of USB, and more do not adopted the hardware interconnect logic, need not the hardware interconnected type RS232 and the dual HART interface of USB of microprocessor.
Summary of the invention
The utility model is the HART interface that will provide a kind of hardware interconnected type not only to possess RS232 but also possess USB, it can use possessing on the computing machine of USB interface, also can on the computing machine that 232 interfaces are only arranged, use, the interface that it can the Auto-Sensing user uses, if the user connects computing machine simultaneously with this interface, this interface can adopt RS232 or USB interface automatically according to the priority of setting.
The utility model is achieved in that the HART interface at a kind of hardware interconnected type support RS232 and the two interfaces of USB, comprises modulation and demodulation, HART level conversion, shaping and filtering circuit, transformer or the photoelectric isolating circuit of hardware interconnect logic, power supply voltage stabilizing commutation circuit, HART signal.Also comprise RS232 interface and USB interface simultaneously, system can select RS232 interface or USB interface and HART bus to communicate according to setting; The RS232 interface links to each other with HART signal modulation and demodulation circuit by the hardware interconnect logic with USB interface; The HART bus interface is isolated by transformer or photoelectricity, and shaping and filtering circuit behind the level shifting circuit, carry out the modulation and demodulation of HART signal, by the bidirectional data exchange of hardware interconnect logic realization with RS232 interface and USB interface; Power supply voltage stabilizing commutation circuit is obtained required power supply by RS232 interface or USB interface, and powers to the modulation and demodulation of hardware interconnect logic, HART level conversion, shaping and filtering circuit, transformer or photoelectric isolating circuit and HART signal respectively.
Power supply voltage stabilizing and commutation circuit just adopt the serial ports stealing in case detect the RS232 interface, i.e. power taking from RS232 data and control line; Detect USB interface and just adopt the power supply of USB; The RS232 interface is connected simultaneously with USB interface, then adopts one of them power supply according to setting, and setting means can adopt wire jumper or software set.
Be serial line interface between RS232 interface and the hardware interconnect logic.Interface between USB interface and the hardware interconnect logic is serial or parallel interface.
The HART interface is the interface that meets the HART standard for Fieldbus.
The hardware interconnect logic can use the fixed logic device or use programmable logic device (PLD), also can use both combinations.
The utility model had not only possessed RS232 but also had possessed the HART interface of USB, it can use possessing on the computing machine of USB interface, also can on the computing machine that the RS232 interface is only arranged, use, the interface that it can the Auto-Sensing user uses, if the user connects computing machine simultaneously with this interface, this interface can adopt RS232 or USB interface automatically according to the priority of setting.This HART interface possesses very big using value, can provide great facility to the user.
Description of drawings
Fig. 1 is the utility model system schematic.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is further described.
As shown in Figure 1, a kind of hardware interconnected type is supported the HART interface at RS232 and the two interfaces of USB, comprises hardware interconnect logic, power supply voltage stabilizing commutation circuit, HART level conversion, shaping and filtering circuit, transformer or photoelectric isolating circuit.Also comprise RS232 interface and USB interface simultaneously, system can select RS232 interface or USB interface and HART bus to communicate according to setting; The RS232 interface links to each other with HART signal modulation and demodulation circuit by the hardware interconnect logic with USB interface; The HART bus interface is isolated by transformer or photoelectricity, and shaping and filtering circuit behind the level shifting circuit, carry out the modulation and demodulation of HART signal, by the bidirectional data exchange of hardware interconnect logic realization with RS232 interface and USB interface; Power supply voltage stabilizing commutation circuit is obtained required power supply by RS232 interface or USB interface, and powers to the modulation and demodulation of hardware interconnect logic, HART level conversion, shaping and filtering circuit, transformer or photoelectric isolating circuit and HART signal respectively.
Be serial line interface between RS232 interface and the hardware interconnect logic.Interface between USB interface and the hardware interconnect logic is serial or parallel interface.The HART interface is the interface that meets the HART standard for Fieldbus.The hardware interconnect logic can use the fixed logic device or use programmable logic device (PLD), also can use both combinations.
The utility model can become the RS232 interface HART bus signals of standard with the USB interface conversion of signals, i.e. BELL 202 frequency shift keyed signals of 1200 baud rates, and 1200Hz is modulated to logical one, and 2200Hz is modulated to logical zero.The USB interface becomes serial or parallel interface signal to be connected with the hardware interconnect logic usb bus conversion of signals by the USB interface chip; Level conversion is carried out by RS232 interface chip or discrete original paper in the RS232 interface, is connected with the asynchronous communication interface of CPU.After interface powers on, the just dynamic state of checking RS232 and USB interface of hardware interconnect logic, if the power supply supply voltage at USB interface is normal or USB interface communication is normal, interface just judges that the USB interface connects so; The RS232 interface adopts the mode of serial ports stealing that this interface is powered, and promptly adopts RTS, the DTR of RS232 interface and TXD signal to power to interface after overcommutation and voltage stabilizing.If the hardware interconnect logic detected serial ports power supply or RS232 interface communication normally so interface just judge that the RS232 interface connects.Interface can be judged use USB interface or RS232 interface automatically.If have only USB interface or RS232 interface to connect, interface just uses this interface so; If USB is connected simultaneously with the RS232 interface, interface is selected one of them interface just according to setting.Setting means can adopt wire jumper or software set.
The hardware interconnect logic can use the fixed logic device, also can use programmable logic device (PLD).If the current USB interface of selecting for use, the hardware interconnect logic will link to each other the receiving and transmitting signal of USB interface with the receiving and transmitting signal of HART modulation and demodulation circuit so; If the current RS232 interface of selecting for use, the hardware interconnect logic will link to each other the receiving and transmitting signal of RS232 with the receiving and transmitting signal of HART modulation and demodulation circuit so;
Embodiment
The hardware interconnect logic adopts three group of two path analoging switch of CD4053 of U.S. fairchild company.The RS232 interface adopts simple triode level shifting circuit and stabilivolt pressure limiting circuit to form; USB interface adopts the FT232BM interface chip of FTDI company; HART modulation and demodulation chip adopts the HT2012 of SMAR company, be connected to USB interface or RS232 interface by the hardware interconnect logic, HART filtering and shaping circuit adopt operation amplifier circuit, adopt the transformer isolation mode to realize the isolation of HART bus and internal circuit.If system has only in USB interface or the RS232 interface to connect computing machine, the receiving and transmitting signal at the corresponding interface interface just switches to HART modulation and demodulation chip by CD4053, power supply just switches power supply by metal-oxide-semiconductor, gives the circuit supply of interface again through the LM1117 Voltage stabilizing module of National Semiconductor; If two connection interfaces connect simultaneously, so just preferential employing USB interface signals interface and power supply.
Claims (6)
1. a hardware interconnected type is supported the HART interface at RS232 and the two interfaces of USB, the modulation and demodulation circuit that comprises hardware interconnect logic, power supply voltage stabilizing commutation circuit, HART level conversion, shaping and filtering circuit, transformer or photoelectric isolating circuit and HART signal, it is characterized in that, also have RS232 interface and USB interface simultaneously, system can select RS232 interface or USB interface and HART bus to communicate according to setting; The RS232 interface links to each other with HART signal modulation and demodulation circuit by the hardware interconnect logic with USB interface; The HART bus interface is isolated by transformer or photoelectricity, and shaping and filtering circuit behind the level shifting circuit, carry out the modulation and demodulation of HART signal, by the bidirectional data exchange of hardware interconnect logic realization with RS232 interface or USB interface; Power supply voltage stabilizing commutation circuit is obtained required power supply by RS232 interface or USB interface, and powers to the modulation and demodulation of hardware interconnect logic, HART level conversion, shaping and filtering circuit, transformer or photoelectric isolating circuit and HART signal respectively.
2. hardware interconnected type according to claim 1 is supported the HART interface at RS232 and the two interfaces of USB, it is characterized in that described power supply voltage stabilizing and commutation circuit just adopt the serial ports stealing in case detect the RS232 interface, i.e. power taking from RS232 data and control line; Detect USB interface and just adopt the power supply of USB; The RS232 interface is connected simultaneously with USB interface, then adopts one of them power supply according to setting, and setting means can adopt wire jumper or software set.
3. hardware interconnected type according to claim 1 is supported the HART interface at RS232 and the two interfaces of USB, it is characterized in that, and be serial line interface between described RS232 interface and the hardware interconnect logic.
4. hardware interconnected type according to claim 1 is supported the HART interface at RS232 and the two interfaces of USB, it is characterized in that the interface between described USB interface and the hardware interconnect logic is serial or parallel interface.
5. hardware interconnected type according to claim 1 is supported the HART interface at RS23 and the two interfaces of USB, it is characterized in that described HART interface is the interface that meets the HART standard for Fieldbus.
6. hardware interconnected type according to claim 1 is supported the HART interface at RS232 and the two interfaces of USB, and described hardware interconnect logic uses fixed logic device, perhaps programmable logic device (PLD), perhaps both combinations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200446470U CN2833676Y (en) | 2005-08-30 | 2005-08-30 | Hard-wired HART interface with RS232 and USB dual interface support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200446470U CN2833676Y (en) | 2005-08-30 | 2005-08-30 | Hard-wired HART interface with RS232 and USB dual interface support |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2833676Y true CN2833676Y (en) | 2006-11-01 |
Family
ID=37197988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2005200446470U Expired - Fee Related CN2833676Y (en) | 2005-08-30 | 2005-08-30 | Hard-wired HART interface with RS232 and USB dual interface support |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2833676Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1975703B (en) * | 2005-11-28 | 2012-06-13 | Smk株式会社 | Data input terminal device |
| CN104794094A (en) * | 2015-04-27 | 2015-07-22 | 浪潮集团有限公司 | System and method for switching USB interface and RS232 interface of server system |
-
2005
- 2005-08-30 CN CNU2005200446470U patent/CN2833676Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1975703B (en) * | 2005-11-28 | 2012-06-13 | Smk株式会社 | Data input terminal device |
| CN104794094A (en) * | 2015-04-27 | 2015-07-22 | 浪潮集团有限公司 | System and method for switching USB interface and RS232 interface of server system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN2833681Y (en) | HART interface holding RS232 and USB dual interface | |
| CN101345629B (en) | Double on-site bus interface converter | |
| CN101673107B (en) | Multi-path serial communication converter and distributed control system applied by same | |
| CN108459982A (en) | The switching method of communication equipment and USB and serial ports | |
| CN101470937A (en) | Access machine of urban monitoring alarm networking system and its monitoring method | |
| CN112199316A (en) | Configuration method and communication method of chain type master-slave serial port communication device | |
| CN101272405B (en) | Receiving equipment, MMIS interface and data interaction method | |
| CN101794267A (en) | USB (Universal Serial Bus) switching device and realizing method thereof | |
| CN2833676Y (en) | Hard-wired HART interface with RS232 and USB dual interface support | |
| CN2845021Y (en) | Multi-series interface multiplex circuits for low speed communication | |
| CN103186126A (en) | Interface device and method used for connecting distributed control system and intelligent device | |
| CN201150103Y (en) | Access machine for city monitoring alarm networking system | |
| CN207817688U (en) | A kind of serial communication bus interface circuit of compatible different agreement | |
| CN201087862Y (en) | IC bus commutation circuit for convergence regulation | |
| CN101594719B (en) | Offline control device | |
| CN201378316Y (en) | Universal input/output interface extension circuit and mobile terminal with same | |
| CN203606824U (en) | Circuit achieving intelligent serial port multiplexing through multi-way switch | |
| CN2824444Y (en) | Field communication converter | |
| CN201340537Y (en) | Human-machine interface integrating PLC function and CAN bus communication ability | |
| CN208172785U (en) | A kind of serial communication control device | |
| CN100407183C (en) | Main board of selectively replacing input/output interface | |
| CN104133447A (en) | Engineering machine control system and engineering machine | |
| CN203102275U (en) | Peripheral component interconnect (PCI) dual-redundancy controller area network (CAN) bus card | |
| CN204406140U (en) | A kind of bus type programable controller system | |
| CN201166803Y (en) | Input module for universal PLC on-off value |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |