CN102158287B - Star-network-based serial communication module and control method thereof - Google Patents
Star-network-based serial communication module and control method thereof Download PDFInfo
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- CN102158287B CN102158287B CN201010591194.9A CN201010591194A CN102158287B CN 102158287 B CN102158287 B CN 102158287B CN 201010591194 A CN201010591194 A CN 201010591194A CN 102158287 B CN102158287 B CN 102158287B
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Abstract
The invention provides a star-network-based serial communication module and a control method thereof. The module comprises a power circuit, a master transceiver, N slave transceiver, an interface circuit and a field programmable gate array (FPGA)/complex programmable logic device (CPLD), wherein N is more than or equal to 1; the FPGA/CPLD comprises an interface unit and a signal transmission unit; the interface unit is connected with the interface circuit; the interface circuit is connected with the interface circuit of external main communication equipment; the interface unit finishes instruction and data transmission with a microprocessor of the external main communication equipment by the interface circuit; and the signal transmission unit is used for finishing communication data transmission between the master transceiver and each slave transceiver, and receiving and processing serial communication data transmitted by the external main communication equipment. By the module and the control method thereof, the networking of a plurality of communication interfaces only capable of realizing a point-to-point communication way can be realized, and an optical fiber can serve as a transmission medium; and the module and the control method thereof are simply structured, intelligently controlled, short in network delay, relatively lower in bit error rate, and convenient for the centralized development of programs and resource sharing.
Description
Technical field
The present invention relates to serial communication control technology, relate in particular to a kind of serial communication module and control method thereof based on star network.
Background technology
At industrial control field; RS-232 agreement is as a kind of serial communication protocol; because its simple and reliable feature has obtained a large amount of utilizations in engineering; but engineering staff can face such contradiction conventionally in the time of system: RS-232 interface can realize point-to-point communication mode, but this mode can not realize network savvy.In order to address this problem, often need to transfer RS-232 interface to RS-485 interface by RS-232/RS-485 modular converter, then form type trunk serial communication network, to realize network savvy.This type trunk serial communication network using broadcast mode transmission data, the information that any one node sends is after communication interface (or adapter), can make all nodes receive, the information that each node is our station station number by destination address receives.But there are three shortcomings in it: 1) in the time that number of nodes is many, the data traffic in bus is large, and the data processing amount of node is large; 2) need the conflict of procotol control bus, will clash bitcom complexity once two or more nodes send information simultaneously; 3), in the time that number of nodes is many, there is resistance matching problem.
Communicating by letter between the master control system of high-voltage large-capacity frequency converter and each subsystem, between strong and weak electricity adopts type trunk or the annular serial communication network using optical fiber as transmission medium, use optical fiber to replace the transmission of level signal, retain the agreement of data link layer, application layer and the client layer of former bus, to improve reliability and the anti-interference of bus.But type trunk serial communication network is in the time that number of nodes is many, the data traffic in bus is large, and the data processing amount of node is large, controls software comparatively complicated; Need in addition the conflict of procotol control bus, will clash once two or more nodes send information simultaneously, will make to control software more complicated; Because each subsystem (power cell) of high-voltage large-capacity frequency converter is in complex electromagnetic environment, too complicated control software, can make the reliability of power cell reduce.And annular serial communication network is because loop wire is public, the information that node sends may be passed through multiple nodes in ring, and information could arrive destination address, controls software also very complicated.Because the power cell of high-voltage large-capacity frequency converter is in complex electromagnetic environment, too complicated software, can make the reliability of power cell reduce; If certain node breaks down, information can not continue to be transmitted to the next node of loop; In addition, when node is too much, can affect efficiency of transmission, whole network response time is elongated, is difficult to ensure the quick in time of communication.
Summary of the invention
Object of the present invention overcomes the deficiency of above-mentioned prior art exactly, provide a kind of and not only can realize the communication interface networking that can only realize point-to-point communication mode by multiple, and can realize using optical fiber as transmission medium, have simple in structure, Based Intelligent Control, network-induced delay is short, and the error rate is lower, is convenient in procedure set the serial communication module based on star network and the control method thereof of exploitation and resource-sharing.
The object of the invention is existing like this: a kind of serial communication module based on star network, comprise that power circuit, 1 main transceiver, N from transceiver (N >=1) and interface circuit, characterized by further comprising the FPGA/CPLD that contains interface unit, signal transmission unit;
Described power circuit is used to described module that power supply is provided;
Described main transceiver is converted to for the optical, electrical signal that main outside communication apparatus is sent the level signal that FPGA/CPLD can identify, and inputs to the RX port of FPGA/CPLD; The level signal that the TX port of FPGA/CPLD is sent is converted to optical, electrical letter and sends to outside main communication apparatus;
The described optical, electrical signal that is used for outside to send from communication apparatus from transceiver is converted to the level signal that FPGA/CPLD can identify, and inputs to RX1～RXN port of FPGA/CPLD; The level signal that TX1～TXN port of FPGA/CPLD is sent is converted to optical, electrical letter and sends to outside from communication apparatus;
Described interface unit is connected with interface circuit, and described interface circuit is connected with outside main communication apparatus interface circuit, interface unit complete by interface circuit and the main communication apparatus microprocessor in outside between instruction and transfer of data;
Described signal transmission unit has been used for main transceiver and each transmits from communication data between transceiver, and receives and process the serial communication data that outside main communication apparatus sends.The input/output interface of signal transmission unit comprises RX, TX, RX1～RXN, TX1～TXN.
In order to realize object of the present invention, a kind of control method of the above-mentioned serial communication module based on star network, is characterized in that taking following steps:
A. the described serial communication module based on star network powers on, and FPGA resets and completes each unit and input, initialization of output port, and address code n is initialized as to " 1 ";
If B. address code n is not 0FFH, signal transmission unit respectively the RXn port of RX port and corresponding address code is assigned to respectively main transceiver input register RX_T and corresponding address code from transceiver input register RXn_T, then RX_T is given to the TXn of corresponding address code, give TX by RXn_T, and then RX, TX are connected with TXn, the RXn of corresponding address code; If address code n is 0FFH, show outside main communication apparatus with broadcast mode and all outsides from communication apparatus communication, do not need outside to reply from communication apparatus, RX is assigned to main transceiver input register RX_T by signal transmission unit, then give TX1～TXN by RX_T, and then RX is connected with TX1～TXN;
C. receive and process the serial communication data that outside main communication apparatus sends, outside main communication apparatus microprocessor control command is included in the serial communication data of its transmission, control command comprises address code, address code is a byte, 001h～0FEh: assigned address, 0FFH: specify global address.
D. return to step B.
In order to realize object of the present invention, the control method of the another kind of above-mentioned serial communication module based on star network, is characterized in that taking following steps:
E. the described serial communication module based on star network powers on, and FPGA resets and completes each unit and input, initialization of output port;
F. the described serial communication module based on star network receives outside main communication apparatus microprocessor control command by interface circuit, interface unit, control command comprises address code n, address code n is a byte, 001h～0FEh: assigned address, 0FFH: specify global address.
If G. address code n is not 0FFH, signal transmission unit respectively the RXn port of RX port and corresponding address code is assigned to respectively main transceiver input register RX_T and corresponding address code from transceiver input register RXn_T, then RX_T is given to the TXn of corresponding address code, give TX by RXn_T, and then RX, TX are connected with TXn, the RXn of corresponding address code; If address code n is 0FFH, show outside main communication apparatus with broadcast mode and all outsides from communication apparatus communication, do not need outside to reply from communication apparatus, RX is assigned to main transceiver input register RX_T by signal transmission unit, then give TX1～TXN by RX_T, and then RX is connected with TX1～TXN;
H. return to step F.
Adopt the solution of the present invention, the communication interface that makes RS232 etc. can only realize point-to-point communication mode has been realized networking; Require the power electronics applications such as high high-voltage large-capacity frequency converter in electromagnetic environment complexity, to Realtime Capability of Communication, having solved communicating by letter between master control system and each subsystem, between strong and weak electricity adopts the data traffic of the type trunk serial communication network using optical fiber as transmission medium large, complex software, the problems such as poor reliability, improve efficiency of transmission, shortened network response time.
Brief description of the drawings
Fig. 1 is the theory diagram of the serial communication module of the embodiment of the present invention based on star network;
Fig. 2 is the circuit theory diagrams of the embodiment of the present invention 1;
Fig. 3 is the software flow block diagram of the embodiment of the present invention 1;
Fig. 4 is the circuit theory diagrams of the embodiment of the present invention 2;
Fig. 5 is the software flow block diagram of the embodiment of the present invention 2.
Embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Referring to Fig. 1.Based on the serial communication module of star network, comprise that power circuit, 1 main transceiver, N are from transceiver (N >=1), interface circuit, and the FPGA/CPLD that contains interface unit, signal transmission unit.Power circuit is used to module that power supply is provided.Main transceiver is converted to for the optical, electrical signal that main outside communication apparatus is sent the level signal that FPGA/CPLD can identify, and inputs to the RX port of FPGA/CPLD; The level signal that the TX port of FPGA/CPLD is sent is converted to optical, electrical letter and sends to outside main communication apparatus.Be converted to for the optical, electrical signal that outside is sent from communication apparatus the level signal that FPGA/CPLD can identify from transceiver, input to RX1～RXN port of FPGA/CPLD; The level signal that TX1～TXN port of FPGA/CPLD is sent is converted to optical, electrical letter and sends to outside from communication apparatus.Interface unit is connected with interface circuit, and described interface circuit is connected with outside main communication apparatus interface circuit, interface unit complete by interface circuit and the main communication apparatus microprocessor in outside between instruction and transfer of data.Signal transmission unit has been used for main transceiver and each transmits from communication data between transceiver, and receives and process the serial communication data that outside main communication apparatus sends.The input/output interface of signal transmission unit comprises RX, TX, RX1～RXN, TX1～TXN.
Embodiment 1
The present embodiment is by adopting the serial communication module based on star network to solve RS232 networking issue.The present embodiment circuit theory diagrams as shown in Figure 2, outside main communication apparatus is connected with this module main transceiver communication interface by terminal J1, outside is connected from transceiver communication interface with this module by terminal J2～J9 from communication apparatus, 1 of the main communication apparatus of its peripheral, outside from 8 of communication apparatus, outside main communication apparatus and outside from adopting master-slave mode to pass through the RS232 communication interface of this module between communication apparatus, realize networking, this module main transceiver and all adopt MAX202 as communication chip from transceiver, FPGA/CPLD selects the EPM1270T14415 type CPLD of ALTERA company.
The software flow pattern of the present embodiment is as shown in Figure 3: first, serial communication module powers on, program starts, enter 1.1 initialization, FPGA resets and completes each unit and input, initialization of output port, then enter 1.2, address code n is initialized as to " 1 ", the destination address of these address representation next frame data, then enter 1.3, judge whether address code n is 0FFH, if address code is not 0FFH, enter 1.4, signal transmission unit is assigned to RX port respectively main transceiver input register RX_T, then enter 1.5, RXn port is assigned to from transceiver input register RXn_T, then enter 1.6, RX_T is given to the TXn of corresponding address code, then enter 1.7, give TX by RXn_T, and then make RX, the TXn of TX and corresponding address code, RXn is connected, if address code is 0FFH, enter 1.8, RX port is assigned to main transceiver input register RX_T, then enter 1.9, give TX1～TX8 by RX_T, show outside main communication apparatus with broadcast mode and all outsides from communication apparatus communication, do not need outsidely to reply from communication apparatus.After the corresponding connection of completing port, enter 1.10, judge that RX port receives data? if do not receive data, return to 1.10, if the data of receiving enter 1.11, receive RX port data, then enter 1.12, judge that data receiver completes? if do not completed, return to 1.11, if complete data receiver, enter 1.13, the communication data that processing receives, then enter 1.14, obtain address code, then return to step 1.3.
The previous frame data of sending by receiving outside main communication apparatus in the control method of the present embodiment, obtain address code n, and then RX, TX are connected with TXn, the RXn of corresponding address code, for the transfer of data of next frame ready.In the control method of the present embodiment, do not use the interface unit of interface circuit and CPLD.
Embodiment 2
At the present embodiment, by employing, the serial communication module based on star network is realized the serial communication system based on star network using optical fiber as transmission medium, have simple in structure, Based Intelligent Control, network-induced delay is short, the error rate is lower, is convenient to exploitation and resource-sharing in procedure set.
The present embodiment circuit theory diagrams as shown in Figure 4, outside main communication apparatus is connected with this serial communication module main transceiver communication interface by fiber optic receiver RCV and fiber optic transmitter TSM, outside is connected from transceiver communication interface with this serial communication module by fiber optic receiver RCV1～RCV24 and fiber optic transmitter TSM1～TSM24 from communication apparatus, 1 of the main communication apparatus of its peripheral, outside from 24 of communication apparatus, outside main communication apparatus and outside from adopting master-slave mode to pass through the serial communication module based on star network using optical fiber as transmission medium between communication apparatus, realize networking.FPGA/CPLD selects the EPM1270T144I5 type CPLD of ALTERA company, and fiber optic receiver adopts HFBR2521, and fiber optic transmitter adopts HFBR1521, and fiber optic receiver adopts HFBR2521, and signal rate reaches 5M bit/s.
The software flow pattern of the present embodiment is as shown in Figure 5: first, serial communication module powers on, program starts, enter 2.1 initialization, FPGA resets and completes each unit and input, initialization of output port, then enter 2.2, judge that whether interface module WR signal is effective, if not, return to 2.2, if, enter 2.3, receive outside main communication apparatus control command, then enter 2.4, obtain address code n, then enter 2.5, judge whether address code n is 0FFH, if address code is not 0FFH, enter 2.6, signal transmission unit is assigned to RX port respectively main transceiver input register RX_T, then enter 2.7, RXn port is assigned to from transceiver input register RXn_T, then enter 2.8, RX_T is given to the TXn of corresponding address code, then enter 2.9, give TX by RXn_T, and then make RX, the TXn of TX and corresponding address code, RXn is connected, if address code is 0FFH, enter 2.10, RX port is assigned to main transceiver input register RX_T, then enter 2.11, give TX1～TX24 by RX_T, show outside main communication apparatus with broadcast mode and all outsides from communication apparatus communication, do not need outsidely to reply from communication apparatus.After the corresponding connection of completing port, return to step 2.2.
In the control method of the present embodiment, receive outside main communication apparatus microprocessor control command by interface circuit, interface unit, obtain address code n, and then RX, TX are connected with TXn, the RXn of corresponding address code, for the transfer of data of next frame ready.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (2)
1. the control method of the serial communication module based on star network, this module comprises that power circuit, 1 main transceiver, N are from transceiver and interface circuit, wherein N>=1, characterized by further comprising the FPGA/CPLD of interface unit, signal transmission unit;
Described power circuit is used to described module that power supply is provided;
Described main transceiver is converted to for the optical, electrical signal that main outside communication apparatus is sent the level signal that FPGA/CPLD can identify, and inputs to the RX port of FPGA/CPLD; The level signal that the TX port of FPGA/CPLD is sent is converted to optical, electrical signal and sends to outside main communication apparatus;
The described optical, electrical signal that is used for outside to send from communication apparatus from transceiver is converted to the level signal that FPGA/CPLD can identify, and inputs to RX1～RXN port of FPGA/CPLD; The level signal that TX1～TXN port of FPGA/CPLD is sent is converted to optical, electrical signal and sends to outside from communication apparatus;
Described interface unit is connected with interface circuit, and described interface circuit is connected with outside main communication apparatus interface circuit, interface unit complete by interface circuit and the main communication apparatus microprocessor in outside between instruction and transfer of data;
Described signal transmission unit has been used for main transceiver and each is from communication data transmission between transceiver, and receive and process the serial communication data that outside main communication apparatus sends, the input/output interface of signal transmission unit comprises RX, TX, RX1～RXN, TX1～TXN;
It is characterized in that taking following steps:
A. the described serial communication module based on star network powers on, and FPGA resets and completes each unit and input, initialization of output port, and address code n is initialized as to " 1 ";
If B. address code n is not 0FFH, RX port is assigned to main transceiver input register RX_T by signal transmission unit, by the RXn port of corresponding address code be assigned to corresponding address code from transceiver input register RXn_T, then RX_T is given to the TXn of corresponding address code, give TX by RXn_T, and then RX, TX are connected with TXn, the RXn of corresponding address code; If address code n is 0FFH, show outside main communication apparatus with broadcast mode and all outsides from communication apparatus communication, do not need outside to reply from communication apparatus, RX is assigned to main transceiver input register RX_T by signal transmission unit, then give TX1～TXN by RX_T, and then RX is connected with TX1～TXN;
C. receive and process the serial communication data that outside main communication apparatus sends, outside main communication apparatus microprocessor control command is included in the serial communication data of its transmission, control command comprises address code, address code is a byte, 001h～0FEh: assigned address, 0FFH: global address
D. return to step B.
2. the control method of the serial communication module based on star network, described module comprises that power circuit, 1 main transceiver, N are from transceiver and interface circuit, wherein N>=1, characterized by further comprising the FPGA/CPLD of interface unit, signal transmission unit;
Described power circuit is used to described module that power supply is provided;
Described main transceiver is converted to for the optical, electrical signal that main outside communication apparatus is sent the level signal that FPGA/CPLD can identify, and inputs to the RX port of FPGA/CPLD; The level signal that the TX port of FPGA/CPLD is sent is converted to optical, electrical signal and sends to outside main communication apparatus;
The described optical, electrical signal that is used for outside to send from communication apparatus from transceiver is converted to the level signal that FPGA/CPLD can identify, and inputs to RX1～RXN port of FPGA/CPLD; The level signal that TX1～TXN port of FPGA/CPLD is sent is converted to optical, electrical signal and sends to outside from communication apparatus;
Described interface unit is connected with interface circuit, and described interface circuit is connected with outside main communication apparatus interface circuit, interface unit complete by interface circuit and the main communication apparatus microprocessor in outside between instruction and transfer of data;
Described signal transmission unit has been used for main transceiver and each is from communication data transmission between transceiver, and receive and process the serial communication data that outside main communication apparatus sends, the input/output interface of signal transmission unit comprises RX, TX, RX1～RXN, TX1～TXN;
It is characterized in that taking following steps:
E. the described serial communication module based on star network powers on, and FPGA resets and completes each unit and input, initialization of output port;
F. the described serial communication module based on star network receives outside main communication apparatus microprocessor control command by interface circuit, interface unit, control command comprises address code n, and address code n is a byte, 001h～0FEh: assigned address, 0FFH: specify global address
If G. address code n is not 0FFH, RX port is assigned to main transceiver input register RX_T by signal transmission unit, by the RXn port of corresponding address code be assigned to corresponding address code from transceiver input register RXn_T, then RX_T is given to the TXn of corresponding address code, give TX by RXn_T, and then RX, TX are connected with TXn, the RXn of corresponding address code; If address code n is 0FFH, show outside main communication apparatus with broadcast mode and all outsides from communication apparatus communication, do not need outside to reply from communication apparatus, RX is assigned to main transceiver input register RX_T by signal transmission unit, then give TX1～TXN by RX_T, and then RX is connected with TX1～TXN;
H. return to step F.
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| CN116954138A (en) * | 2023-09-21 | 2023-10-27 | 青岛鼎信通讯股份有限公司 | Master-slave communication method applied to intelligent direct-current metering and control equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6401159B1 (en) * | 1997-07-20 | 2002-06-04 | Icp Das Co., Ltd. | Method of half-duplex serial signal control with multi-baud rate and multi-configuration |
| CN201274482Y (en) * | 2008-09-28 | 2009-07-15 | 福建三元达通讯股份有限公司 | High speed data transmission interface system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6401159B1 (en) * | 1997-07-20 | 2002-06-04 | Icp Das Co., Ltd. | Method of half-duplex serial signal control with multi-baud rate and multi-configuration |
| CN201274482Y (en) * | 2008-09-28 | 2009-07-15 | 福建三元达通讯股份有限公司 | High speed data transmission interface system |
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