CN105812346A - Data interaction method of serial port device and Ethernet device - Google Patents
Data interaction method of serial port device and Ethernet device Download PDFInfo
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- CN105812346A CN105812346A CN201510937745.5A CN201510937745A CN105812346A CN 105812346 A CN105812346 A CN 105812346A CN 201510937745 A CN201510937745 A CN 201510937745A CN 105812346 A CN105812346 A CN 105812346A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/08—Protocols for interworking; Protocol conversion
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
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Abstract
The invention discloses a data interaction method of a serial port device and an Ethernet device. The method runs in various operating systems and single-chip microcomputers, and according to different system platforms and operating platforms, mutual communication can be realized through the method, such as communication between a serial port in a Linux system and Ethernet in Windows and communication between a serial port of a single-chip microcomputer and Ethernet in the Linux. By using the method provided by the invention, mutual identification and circulation of serial port data and Ethernet data (based on a standard Modbus protocol) are realized, and cross-network data transmission is realized at a low cost.
Description
Technical field
The present invention relates to data interaction field, particularly relate to the data interactive method of a kind of serial equipment and ethernet device.
Background technology
Current Modbus communication generally adopts Ethernet and two kinds of forms of serial ports.For most of basic units equipment, employing is serial communication, and for the equipment of most of tape operation systems, employing is ethernet communication.For two equipment needing data interaction, it is desirable to have a unified communication interface and communication protocol.
Under the prior art, if the communication interface of two equipment is inconsistent, one is Ethernet interface, and one is serial ports, then two device datas can not circulate, and can not carry out data interaction.
Summary of the invention
Present invention aims to the deficiencies in the prior art, the data interactive method of a kind of serial equipment and ethernet device is provided, serial data and Ethernet data (based on standard Modbus agreement) are identified mutually, circulate, it is achieved across a network data transmission under low cost.
The object of the present invention is achieved like this: the data interactive method of a kind of serial equipment and ethernet device, during using serial ports end as service end, comprises the steps:
1) create ethernet communication, obtain the data that Ethernet receives, and the data received by Ethernet are saved in Ethernet and receive in relief area；
2) judge Ethernet receives in relief area whether have data, if Ethernet receives in relief area data, then the data received by Ethernet in relief area carry out protocol conversion, and the data after protocol conversion are put in serial ports transmission relief area, continue step 3)；If Ethernet receives in relief area does not have data, then return step 1)；
3) judge serial ports sends in relief area whether have data, if serial ports sends in relief area data, then serial ports is sent the data in relief area and sends to the equipment being connected with serial ports, continue step 4)；If serial ports sends in relief area does not have data, then return step 1)；
4) create serial communication, obtain the data that serial ports receives, and the data received by serial ports are saved in serial ports and receive in relief area；
5) judging serial ports receives in relief area whether have data, if serial ports receives in relief area data, then the data received by serial ports in relief area carry out protocol conversion, and the data after protocol conversion are put in Ethernet transmission relief area, continue step 6)；If serial ports receives in relief area does not have data, then return step 4)；
6) judge Ethernet sends in relief area whether have data, if Ethernet sends in relief area data, then Ethernet is sent the data in relief area and sends to the equipment being connected with Ethernet interface, return step 1)；If Ethernet sends in relief area does not have data, then return step 4).
When program needs to exit, stop protocol conversion, stop Ethernet, serial ports sending and receiving data, close Ethernet interface, close serial ports.
During using serial ports end as service end, the data received by Ethernet are saved in Ethernet and receive in relief area, obtain new sequence of data frames number.Sequence of data frames number is No. ID that receives Ethernet data, and within the same period, the ID of each Frame is unique.After receiving the data of Ethernet, Ethernet data Content Transformation is become ModbusTCP/IP agreement, the first two byte, i.e. transaction identifier in ModbusTCP/IP agreement, it is also desirable to preserve.The serial data frame that the data creation that receives according to Ethernet is new, when creating new serial data frame, data division needs to remove the anterior transaction identifier of data, protocol type, data length.This serial data frame is saved in serial ports transmission buffer.After the serial data frame that the data creation received according to Ethernet is new, while being stored in serial ports transmission relief area, the serial number of Frame is delivered in Serial Port Information.After serial ports receives data, search corresponding Ethernet information according to serial number.The data received by serial ports are saved in serial ports and receive in relief area.All of Ethernet information in traversal Serial Port Information, finds out the current data number of frames of correspondence.The ethernet data frame that the data creation that receives according to serial ports is new, when creating new ethernet data frame, data division needs to remove CRC check, increases transaction identifier, protocol type, data length in data front portion.This ethernet data frame is saved in Ethernet send in relief area.Employing this method can so that multiple serial equipment can carry out communication with one or more ethernet devices.
The data interactive method of a kind of serial equipment and ethernet device, during using serial ports end as client, comprises the steps:
1) create serial communication, obtain the data that serial ports receives, and the data that serial ports receives are saved in serial ports reception relief area；
2) judging serial ports receives in relief area whether have data, if serial ports receives in relief area data, then the data received by serial ports in relief area carry out protocol conversion, and the data after protocol conversion are put in Ethernet transmission relief area, continue step 3)；If serial ports receives in relief area does not have data, then return step 1)；
3) judge Ethernet sends in relief area whether have data, if Ethernet sends in relief area data, then Ethernet is sent the data in relief area and sends to the equipment being connected with Ethernet interface, continue step 4)；If Ethernet sends in relief area does not have data, then return step 1)；
4) create ethernet communication, obtain the data that Ethernet receives, and the data that Ethernet receives are saved in Ethernet reception relief area；
5) judge Ethernet receives in relief area whether have data, if Ethernet receives in relief area data, then the data received by Ethernet in relief area carry out protocol conversion, and the data after protocol conversion are put in serial ports transmission relief area, continue step 6)；If Ethernet receives in relief area does not have data, then return step 4)；
6) judge serial ports sends in relief area whether have data, if serial ports sends in relief area data, then serial ports is sent the data in relief area and sends to the equipment being connected with serial ports, return step 1)；If serial ports sends in relief area does not have data, then return step 4).When program needs to exit, stop protocol conversion, stop Ethernet, serial ports sending and receiving data, close Ethernet interface, close serial ports.
During using serial ports end as client, the data received by serial ports are saved in serial ports and receive in relief area, obtain new sequence of data frames number, and sequence of data frames number is No. ID that receives serial data, and within the same period, the ID of each Frame is unique.The ethernet data frame that the data creation that receives according to serial ports is new, when creating new ethernet data frame, data division needs to remove CRC check, increases transaction identifier, protocol type, data length in data front portion.This ethernet data frame is saved in Ethernet transmission buffer.After the ethernet data frame that the data creation received according to serial ports is new, while being stored in Ethernet transmission relief area, the serial number of Frame is delivered in Ethernet information.After Ethernet interface receives data, search corresponding Serial Port Information according to serial number.The data received by Ethernet are saved in Ethernet and receive in relief area, all of Serial Port Information in traversal Ethernet information, find out the current data number of frames of correspondence, the serial data frame that the data creation that receives according to Ethernet is new, when creating new serial data frame, data division needs to remove the anterior transaction identifier of data, protocol type, data length.This serial data frame is saved in serial ports transmission buffer.Employing this method can so that multiple serial equipment can carry out communication with one or more ethernet devices.
The data received by Ethernet resolve, extract the element identifier (element ID) at data division rear portion, function code, data (i.e. removing Ethernet protocol content, extract relative to the data division in Ethernet protocol), convert serial port protocol data to, transaction identifier, protocol type, data length (interpolation is the MODBUSTCP/IP header information relative to MODBUS) are added in the data division front portion received by serial ports, and remove the CRC check of data division, convert Ethernet protocol data to, referring to Fig. 5.
The invention have the benefit that method portability provided by the present invention is high, applied widely, and conversion efficiency is high, conversion speed is fast.This method can be implemented in each type operating system, single-chip microcomputer, the data interaction of serial equipment and ethernet device can be realized by the program in machine code of operating energy loss on existing industrial computer etc., serial data and Ethernet data (based on standard Modbus agreement) are identified mutually, circulate, it is achieved across a network data transmission under low cost.And adopt the present invention method can Overpassing Platform by Using, process realizes uncomplicated, very low cost, if method is run on PC, then has only to increase RS485 Serial Communication Card (if PC carries, need not), practicality height.According to different system platforms, operating platform, the present invention can so as to intercom mutually.Such as, serial ports in linux system and the ethernet communication in Windows, for instance the serial ports in single-chip microcomputer and the ethernet communication in Linux.
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Accompanying drawing explanation
Fig. 1 is the serial ports end of the present invention is operational flow diagram during service end；
Fig. 2 is the serial ports end of the present invention is operational flow diagram during client；
Fig. 3 is that serial ports end data of the present invention processes operational process
Fig. 4 is that ethernet side data of the present invention process operational process
Fig. 5 is the communication format comparison diagram with serial data form of ModbusTcp/Ip.
Detailed description of the invention
Embodiment one
Referring to Fig. 1, Fig. 3 and Fig. 4, the data interactive method of a kind of serial equipment and ethernet device, during using serial ports end as service end, comprise the steps:
1) create ethernet communication, obtain the data that Ethernet receives, and the data received by Ethernet are saved in Ethernet and receive in relief area；
2) judge Ethernet receives in relief area whether have data, if Ethernet receives in relief area data, the data then extracted in Ethernet reception relief area preserve, then the data received by Ethernet in relief area carry out protocol conversion, and the data after protocol conversion are put in serial ports transmission relief area, continue step 3)；If Ethernet receives in relief area does not have data, then return step 1)；
3) judge serial ports sends in relief area whether have data, if serial ports sends in relief area data, then serial ports is sent the data in relief area and sends to the equipment being connected with serial ports, continue step 4)；If serial ports sends in relief area does not have data, then return step 1)；
4) create serial communication, obtain the data that serial ports receives, and the data received by serial ports are saved in serial ports and receive in relief area；
5) judge serial ports receives in relief area whether have data, if serial ports receives in relief area data, the data then extracted in serial ports reception relief area preserve, then the data received by serial ports in relief area carry out protocol conversion, and the data after protocol conversion are put in Ethernet transmission relief area, continue step 6)；If serial ports receives in relief area does not have data, then return step 4)；
6) judge Ethernet sends in relief area whether have data, if Ethernet sends in relief area data, then Ethernet is sent the data in relief area and sends to the equipment being connected with Ethernet interface, return step 1)；If Ethernet sends in relief area does not have data, then return step 4).
When program needs to exit, stop protocol conversion, stop Ethernet, serial ports sending and receiving data, close Ethernet interface, close serial ports.
During using serial ports end as service end, the data received by Ethernet are saved in Ethernet and receive in relief area, obtain new sequence of data frames number.Sequence of data frames number is No. ID that receives Ethernet data, and within the same period, the ID of each Frame is unique.After receiving the data of Ethernet, Ethernet data Content Transformation is become ModbusTCP/IP agreement, the first two byte, i.e. transaction identifier in ModbusTCP/IP agreement, it is also desirable to preserve.The serial data frame that the data creation that receives according to Ethernet is new, when creating new serial data frame, data division needs to remove the anterior transaction identifier of data, protocol type, data length.This serial data frame is saved in serial ports transmission buffer.After the serial data frame that the data creation received according to Ethernet is new, while being stored in serial ports transmission relief area, the serial number of Frame is delivered in Serial Port Information.After serial ports receives data, search corresponding Ethernet information according to serial number.The data received by serial ports are saved in serial ports and receive in relief area.All of Ethernet information in traversal Serial Port Information, finds out the current data number of frames of correspondence.The ethernet data frame that the data creation that receives according to serial ports is new, when creating new ethernet data frame, data division needs to remove CRC check, increases transaction identifier, protocol type, data length in data front portion.This ethernet data frame is saved in Ethernet send in relief area.Employing this method can so that multiple serial equipment can carry out communication with one or more ethernet devices.
Embodiment two
The data interactive method of a kind of serial equipment and ethernet device, during using serial ports end as client, comprises the steps:
1) create serial communication, obtain the data that serial ports receives, and the data that serial ports receives are saved in serial ports reception relief area；
2) judging serial ports receives in relief area whether have data, if serial ports receives in relief area data, then the data received by serial ports in relief area carry out protocol conversion, and the data after protocol conversion are put in Ethernet transmission relief area, continue step 3)；If serial ports receives in relief area does not have data, then return step 1)；
3) judge Ethernet sends in relief area whether have data, if Ethernet sends in relief area data, then Ethernet is sent the data in relief area and sends to the equipment being connected with Ethernet interface, continue step 4)；If Ethernet sends in relief area does not have data, then return step 1)；
4) create ethernet communication, obtain the data that Ethernet receives, and the data that Ethernet receives are saved in Ethernet reception relief area；
5) judge Ethernet receives in relief area whether have data, if Ethernet receives in relief area data, then the data received by Ethernet in relief area carry out protocol conversion, and the data after protocol conversion are put in serial ports transmission relief area, continue step 6)；If Ethernet receives in relief area does not have data, then return step 4)；
6) judge serial ports sends in relief area whether have data, if serial ports sends in relief area data, then serial ports is sent the data in relief area and sends to the equipment being connected with serial ports, return step 1)；If serial ports sends in relief area does not have data, then return step 4).When program needs to exit, stop protocol conversion, stop Ethernet, serial ports sending and receiving data, close Ethernet interface, close serial ports.
During using serial ports end as client, the data received by serial ports are saved in serial ports and receive in relief area, obtain new sequence of data frames number, and sequence of data frames number is No. ID that receives serial data, and within the same period, the ID of each Frame is unique.The ethernet data frame that the data creation that receives according to serial ports is new, when creating new ethernet data frame, data division needs to remove CRC check, increases transaction identifier, protocol type, data length in data front portion.This ethernet data frame is saved in Ethernet transmission buffer.After the ethernet data frame that the data creation received according to serial ports is new, while being stored in Ethernet transmission relief area, the serial number of Frame is delivered in Ethernet information.After Ethernet interface receives data, search corresponding Serial Port Information according to serial number.The data received by Ethernet are saved in Ethernet and receive in relief area, all of Serial Port Information in traversal Ethernet information, find out the current data number of frames of correspondence, the serial data frame that the data creation that receives according to Ethernet is new, when creating new serial data frame, data division needs to remove the anterior transaction identifier of data, protocol type, data length.This serial data frame is saved in serial ports transmission buffer.Employing this method can so that multiple serial equipment can carry out communication with one or more ethernet devices.
Referring to Fig. 5, the data received by Ethernet resolve, extract the element identifier (element ID) at data division rear portion, function code, data (i.e. removing Ethernet protocol content, extract relative to the data division in Ethernet protocol), convert serial port protocol data to, transaction identifier, protocol type, data length (interpolation is the MODBUSTCP/IP header information relative to MODBUS) are added in the data division front portion received by serial ports, and remove the CRC check of data division, convert Ethernet protocol data to, referring to Fig. 5.
The communication format of ModbusTcp/Ip is as shown in table 1
Table 1
Serial data form is as shown in table 2
Table 2
It is as shown in table 3 that Serial Port Information deposits content, and it is as shown in table 4 that Ethernet information deposits content.Serial Port Information, Ethernet information are configuration information, and parameter required when running preserves.
Each Ethernet, serial ports have an information
Table 3
Table 4
The present invention is not limited solely to above-described embodiment, carries out the technical scheme of few modifications, should fall into protection scope of the present invention when without departing substantially from technical solution of the present invention spirit.
Claims (6)
1. the data interactive method of a serial equipment and ethernet device, it is characterised in that during using serial ports end as service end, comprise the steps:
1) create ethernet communication, obtain the data that Ethernet receives, and the data received by Ethernet are saved in Ethernet and receive in relief area；
2) judge Ethernet receives in relief area whether have data, if Ethernet receives in relief area data, then the data received by Ethernet in relief area carry out protocol conversion, and the data after protocol conversion are put in serial ports transmission relief area, continue step 3)；If Ethernet receives in relief area does not have data, then return step 1)；
3) create serial communication, it is judged that serial ports sends in relief area whether have data, if serial ports sends in relief area data, then serial ports is sent the data in relief area and sends to the equipment being connected with serial ports, continue step 4)；If serial ports sends in relief area does not have data, then return step 1)；
4) obtain the data that serial ports receives, and the data received by serial ports are saved in serial ports and receive in relief area；
5) judging serial ports receives in relief area whether have data, if serial ports receives in relief area data, then the data received by serial ports in relief area carry out protocol conversion, and the data after protocol conversion are put in Ethernet transmission relief area, continue step 6)；If serial ports receives in relief area does not have data, then return step 4)；
6) judge Ethernet sends in relief area whether have data, if Ethernet sends in relief area data, then Ethernet is sent the data in relief area and sends to the equipment being connected with Ethernet interface, return step 1)；If Ethernet sends in relief area does not have data, then return step 4).
2. data interactive method according to claim 1, it is characterized in that: the data received by Ethernet resolve, extract the element identifier (element ID) at data division rear portion, function code, data, convert serial port protocol data to, transaction identifier, protocol type, data length are added in the data division front portion received by serial ports, and remove the CRC check of data division, convert Ethernet protocol data to.
3. data interactive method according to claim 1, it is characterized in that: the data received by Ethernet are saved in Ethernet and receive in relief area, obtain new sequence of data frames number, create new serial data frame, this serial data frame is saved in serial ports and sends in relief area；The data received by serial ports are saved in serial ports and receive in relief area, all of Ethernet information in traversal Serial Port Information, find out the current data number of frames of correspondence, create new ethernet data frame, this ethernet data frame is saved in Ethernet and sends in relief area.
4. the data interactive method of a serial equipment and ethernet device, it is characterised in that during using serial ports end as client, comprise the steps:
1) create serial communication, obtain the data that serial ports receives, and the data that serial ports receives are saved in serial ports reception relief area；
2) judging serial ports receives in relief area whether have data, if serial ports receives in relief area data, then the data received by serial ports in relief area carry out protocol conversion, and the data after protocol conversion are put in Ethernet transmission relief area, continue step 3)；If serial ports receives in relief area does not have data, then return step 1)；
3) create ethernet communication, it is judged that Ethernet sends in relief area whether have data, if Ethernet sends in relief area data, then Ethernet is sent the data in relief area and sends to the equipment being connected with Ethernet interface, continue step 4)；If Ethernet sends in relief area does not have data, then return step 1)；
4) obtain the data that Ethernet receives, and the data that Ethernet receives are saved in Ethernet reception relief area；
5) judge Ethernet receives in relief area whether have data, if Ethernet receives in relief area data, then the data received by Ethernet in relief area carry out protocol conversion, and the data after protocol conversion are put in serial ports transmission relief area, continue step 6)；If Ethernet receives in relief area does not have data, then return step 4)；
6) judge serial ports sends in relief area whether have data, if serial ports sends in relief area data, then serial ports is sent the data in relief area and sends to the equipment being connected with serial ports, return step 1)；If serial ports sends in relief area does not have data, then return step 4).
5. data interactive method according to claim 4, it is characterized in that: the data received by Ethernet resolve, extract the element identifier (element ID) at data division rear portion, function code, data, convert serial port protocol data to, transaction identifier, protocol type, data length are added in the data division front portion received by serial ports, and remove the CRC check of data division, convert Ethernet protocol data to.
6. data interactive method according to claim 4, it is characterized in that: the data received by serial ports are saved in serial ports and receive in relief area, obtain new sequence of data frames number, create new ethernet data frame, this ethernet data frame is saved in Ethernet transmission buffer；The data received by Ethernet are saved in Ethernet and receive in relief area, all of Serial Port Information in traversal Ethernet information, find out the current data number of frames of correspondence, create new serial data frame, this serial data frame is saved in serial ports transmission buffer.
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| CN105812346B (en) | 2019-03-29 |
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