CN100444595C - A method of master-slave equipment communication - Google Patents
A method of master-slave equipment communication Download PDFInfo
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- CN100444595C CN100444595C CNB200410102538XA CN200410102538A CN100444595C CN 100444595 C CN100444595 C CN 100444595C CN B200410102538X A CNB200410102538X A CN B200410102538XA CN 200410102538 A CN200410102538 A CN 200410102538A CN 100444595 C CN100444595 C CN 100444595C
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- 238000004891 communication Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000011664 signaling Effects 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
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Abstract
The present invention provides a method of master-slave equipment communication in order to solve the problem of complicated communication mechanism in the prior art. The method of master-slave equipment communication comprises the steps: A. master equipment converts the data needing to the sent to slave equipment into character strings and sends the character strings to the slave equipment; B. the slave equipment converts the received character strings into the data sent by the master equipment. The adoption of the method of the present invention can simply realize the data communication between the master equipment and the slave equipment in short distance.
Description
Technical field
The present invention relates to data communication, refer to the data communications method between a kind of master-slave equipment especially.
Background technology
Generally speaking, the communication protocol between the equipment has a variety of, such as TCP etc., these communication protocol more complicated, but also error code, verification, repeating transmission or the like mechanism is arranged, system is very huge, is the application scenario of this communication protocol the best at the easy disturbed environment of communication channel.
In fact, when communicating between the very near equipment for distance, because two communication equipments are separated by very near (generally in 2 meters), communication channel is stable, be difficult to be subjected to external interference and cause error code, therefore, do not need the communication mechanism of complexity such as verification, repeating transmission to ensure the reliability and the correctness of communication.Particularly for the communication between the master-slave equipment, because main equipment is fixed as command originator, slave unit is passive reception order or data, between the master-slave equipment seldom or do not have the mutual of signaling, in such application, use communication protocols such as TCP to communicate and to bring very big raising on the performance as system, and make system become complicated huge, for this reason, can seek a kind of better simply relatively communication mechanism and realize data communication between the in-plant master-slave equipment.
During communication between the reliable equipment of this communication channel, tend to adopt following similarly communication protocol, this communication protocol generally is to increase a signaling head (generally the length of this signaling head is 4 bytes) in the front of each packet, follow the length information (generally also being 4 bytes) of this signaling then, represent this length of data package, also use a signaling at last and represent that packet finishes, as shown in Figure 1.Similarly communication protocol has some following shortcomings:
1, adding the purpose of signaling head, is in order to represent the beginning of packet, because appearance is very low with the probability of signaling 4 an identical byte data in the data of being transmitted, therefore this communication mechanism still can not take place in the situation of makeing mistakes of fundamentally avoiding communicating by letter;
2,,, may cause the communication recovery of comparison difficulty owing to the existence of length information when a garble occurring;
3, this communication protocol is lower to the communication efficiency of a small amount of valid data.
Summary of the invention
The invention provides a kind of method of master-slave equipment communication, to solve communication mechanism complicated problems in the prior art.
Method of master-slave equipment communication provided by the invention comprises the following steps:
A, main equipment convert the content-data that needs send to slave unit to character string, insert the separator of distinguishing the different pieces of information group, in the end the end of a character string adds the end sign of expression ED, the character string of inserting described separator and finish to identify is broken into packet send to slave unit;
B, slave unit convert the described character string that receives to content-data that main equipment sends according to described separator that comprises in the packet that receives and end sign.
Described character string is the character string with the ASCII character definition.
Slave unit is according to the separator that comprises in the packet that receives and finish sign, converts the described character string that receives to data that main equipment sends, specifically comprises:
Slave unit is changed the data before and after the separator respectively according to the separator that receives, and finishes the data transaction that sign finishes current data packet according to packet.Described separator is the space.
Described packet finishes to be designated the carriage return character.
Be provided with a character string array in the described slave unit, the character string that receives is deposited in this character string array; When receiving a carriage return character, read the character string of storing in this character string array and change, and empty this character string array.
Described packet is the identical or different packet of length.
Adopt method of the present invention, the communication between can the simple realization master-slave equipment, with respect to prior art, the advantage of the inventive method is as follows:
1, the carriage return character has guaranteed correctly beginning of each packet;
If 2 mistake occurs at certain packet, the recovery communication that its next packet is just correct;
3, when low volume data was communicated by letter, its efficient was than higher.
Description of drawings
Fig. 1 is a prior art data packet format schematic diagram;
Fig. 2 is a main equipment data transaction flow chart in the embodiment of the invention;
Fig. 3 is slave unit receiving data stream journey figure in the embodiment of the invention;
Fig. 4 is a slave unit data transaction flow chart in the embodiment of the invention.
Embodiment
The inventive method is applicable to two the very near master-slave equipments of being separated by, and is connected by communication interface (serial ports or parallel port) between them.Suppose that main equipment will send 16 system data 0x112233 to slave unit, it carries parameter 0x44, then need carry out data transaction at main equipment, converts 16 system data 0x112233 to the ASCII character character string and sends.In order to make slave unit correctly the character string that receives is reduced into the initial data that main equipment sends, need the identifier of agreement expression end of signaling in master-slave equipment in advance, adopt the carriage return character to represent the packet of a signaling to finish in the present embodiment; Because signaling might have one or more parameters, need to be separated between parameter and the signaling or between the parameter, therefore, the argumnent separator of need making an appointment adopts the space to separate in the present embodiment.According to above-mentioned agreement, the idiographic flow that the data transaction that main equipment will need to transmit becomes character string comprises the following steps: as shown in Figure 2
At first convert 16 system data 0x112233 to character string, obtain " 112233 ";
Increase the space, and parameter 0x44 is converted to the parameter character string, obtain " 11223344 ";
Increase the carriage return character, represent this signaling data end-of-packet, obtain " 11223344 n ", wherein " n " expression carriage return character;
Data after this conversion are sent to slave unit by the communication interface between main equipment and the slave unit.
Slave unit receiving data stream journey figure comprises the following steps: as shown in Figure 3
S31: slave unit constantly detects the communication interface with main equipment;
S32: arrive if detect new data, then execution in step S33; Otherwise, return step S31, continue the wait main equipment and send new data;
S33: the data message that reads reception;
S34: whether the data of judging current reception are the carriage return character of a data end-of-packet of expression, if not, and execution in step S35; If, execution in step S36;
S35: preserved in storage to the character string array of in slave unit, opening up with current reception, return step S31, wait for that the character late string of packet is sent to the slave unit from interface;
S36: read the data of preserving in the character string array, promptly the alphabet string of current data packet prepares to enter the character string flow path switch, converts the character string that receives to 16 system data.
Concrete conversion method comprises the following steps: as shown in Figure 4
S41: the data that from the character string array, read a packet; In the present embodiment, the data of reading are character string " 112,233 44 ", and string length was 9 (comprising the space);
S42: judge between each character string of this packet whether have the space, if having, execution in step S43 then, otherwise, go to step S44;
S43: with the space is boundary, and the character string that receives is divided into the separate character string of some strings; In the present embodiment, obtain two string character strings, the first string character string is " 112233 "; The second string character string is " 44 ";
S44: convert each character string to 16 system data, can obtain signaling data 0x112233 and 0x44 that main equipment sends.
Among the above embodiment, the packet end identifier can be made an appointment in master-slave equipment and is any character.Separator between the character string also can be made an appointment in master-slave equipment and is any character.
Among the present invention, the data that main equipment need send are not limited to 16 system data among the embodiment, can be the arbitrary carry system data.
Character string after the present invention's conversion can be the character string of ASCII character definition, but is not limited thereto.
Claims (7)
1, a kind of method of master-slave equipment communication is characterized in that, comprises the following steps:
A, main equipment convert the content-data that needs send to slave unit to character string, insert the separator of distinguishing the different pieces of information group, in the end the end of a character string adds the end sign of expression ED, the character string of inserting described separator and finish to identify is broken into packet send to slave unit;
B, slave unit convert the described character string that receives to content-data that main equipment sends according to described separator that comprises in the packet that receives and end sign.
2, method of master-slave equipment communication as claimed in claim 1 is characterized in that, described character string is the character string with the ASCII character definition.
3, method of master-slave equipment communication as claimed in claim 1 is characterized in that, described slave unit is according to the described separator that comprises in the packet that receives and finish sign, converts the described character string that receives to data that main equipment sends, specifically comprises:
Described slave unit is changed the data before and after the described separator respectively according to the described separator that receives, and finishes the data transaction that sign finishes current data packet according to described packet.
4, method of master-slave equipment communication as claimed in claim 1 is characterized in that, described separator is the space.
5, method of master-slave equipment communication as claimed in claim 1 is characterized in that, described packet finishes to be designated the carriage return character.
6, method of master-slave equipment communication as claimed in claim 5 is characterized in that, is provided with a character string array in the described slave unit, and the character string that receives is deposited in this character string array; When receiving a carriage return character, read the character string of storing in this character string array and change, and empty this character string array.
7, method of master-slave equipment communication as claimed in claim 1 is characterized in that, described packet is the identical or different packet of length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410102538XA CN100444595C (en) | 2004-12-24 | 2004-12-24 | A method of master-slave equipment communication |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410102538XA CN100444595C (en) | 2004-12-24 | 2004-12-24 | A method of master-slave equipment communication |
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| CN1633125A CN1633125A (en) | 2005-06-29 |
| CN100444595C true CN100444595C (en) | 2008-12-17 |
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| CNB200410102538XA Expired - Fee Related CN100444595C (en) | 2004-12-24 | 2004-12-24 | A method of master-slave equipment communication |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9507930B2 (en) | 2003-04-25 | 2016-11-29 | Z124 | Physical key secure peripheral interconnection |
| US20130198867A1 (en) | 2011-12-09 | 2013-08-01 | Z124 | A Docking Station for Portable Devices Providing Authorized Power Transfer and Facility Access |
| CN101453313B (en) * | 2007-12-06 | 2013-03-20 | 鸿富锦精密工业（深圳）有限公司 | Communication circuit for master-slave equipment |
| EP2622492A4 (en) * | 2010-10-01 | 2015-08-12 | Z124 | Systems and methods for docking portable electronics devices |
| US9383770B2 (en) | 2011-08-31 | 2016-07-05 | Z124 | Mobile device that docks with multiple types of docks |
| US9244491B2 (en) | 2011-08-31 | 2016-01-26 | Z124 | Smart dock for auxiliary devices |
| CN104486034B (en) * | 2014-12-08 | 2017-12-01 | 江西洪都航空工业集团有限责任公司 | A kind of RS422/485 serial port communication datas group bag method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5481675A (en) * | 1992-05-12 | 1996-01-02 | International Business Machines Corporation | Asynchronous serial communication system for delaying with software dwell time a receiving computer's acknowledgement in order for the transmitting computer to see the acknowledgement |
| US5936540A (en) * | 1995-12-13 | 1999-08-10 | Eric Bauer | Process for the management of concurrent access and device for practicing the same |
| CN1337629A (en) * | 2000-08-05 | 2002-02-27 | 三星电子株式会社 | Bus system and its instruct transmission method |
| US20040013123A1 (en) * | 2002-07-17 | 2004-01-22 | Lsi Logic Corporation | Active FIFO threshold adjustment |
| JP2004187006A (en) * | 2002-12-03 | 2004-07-02 | Matsushita Electric Ind Co Ltd | Data structure, slave instrument, and master instrument |
-
2004
- 2004-12-24 CN CNB200410102538XA patent/CN100444595C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5481675A (en) * | 1992-05-12 | 1996-01-02 | International Business Machines Corporation | Asynchronous serial communication system for delaying with software dwell time a receiving computer's acknowledgement in order for the transmitting computer to see the acknowledgement |
| US5936540A (en) * | 1995-12-13 | 1999-08-10 | Eric Bauer | Process for the management of concurrent access and device for practicing the same |
| CN1337629A (en) * | 2000-08-05 | 2002-02-27 | 三星电子株式会社 | Bus system and its instruct transmission method |
| US20040013123A1 (en) * | 2002-07-17 | 2004-01-22 | Lsi Logic Corporation | Active FIFO threshold adjustment |
| JP2004187006A (en) * | 2002-12-03 | 2004-07-02 | Matsushita Electric Ind Co Ltd | Data structure, slave instrument, and master instrument |
Non-Patent Citations (2)
| Title |
|---|
| C语言程序设计. 谭浩强,138-144,科学出版社，龙门书局. 2001 |
| C语言程序设计. 谭浩强,138-144,科学出版社，龙门书局. 2001 * |
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| CN1633125A (en) | 2005-06-29 |
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