CN100512141C - Method for implementing remote debarkation of embedded equipment by cascade interface - Google Patents
Method for implementing remote debarkation of embedded equipment by cascade interface Download PDFInfo
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- CN100512141C CN100512141C CNB2005100719379A CN200510071937A CN100512141C CN 100512141 C CN100512141 C CN 100512141C CN B2005100719379 A CNB2005100719379 A CN B2005100719379A CN 200510071937 A CN200510071937 A CN 200510071937A CN 100512141 C CN100512141 C CN 100512141C
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Abstract
This invention discloses a method for realizing remote debarkation of embedded device by series including: a network back stage obtains the match information of far end inserted devices by a series and the display data of the current interface of its output device, generates an analog man-machine interaction interface of the device on the interface of a customer region and sends the control instruction generated by its input device to its far end inserted device, which buffer-processes said instruction and feeds back the display data to the back stage, the far end inserted device generates related current interface display data in the display buffer-zone set in its memory and sends them to an output device.
Description
Technical field
The present invention relates in the communications field remote equipment be carried out the method for monitoring management, especially relate to a kind of serial ports that utilizes and realize the embedded device Telnet, thus the method for this embedded device being carried out monitoring management.
Background technology
Development and growth in the living standard along with technology, electronic products such as increasing Industry Control, medical treatment, communication and consumption are intelligent day by day, the embedded system that with the microprocessor is core obtains increasingly extensive application, these intelligent equipments is managed an emphasis that also becomes Embedded Application.The intelligence interface that the user can provide by equipment as serial ports, parallel port, Ethernet interface etc., is configured, manages and monitor it.Fast Ethernet interface based on TCP/IP (TCP) agreement of complexity is a future thrust, can as present desktop PC (personal computer), carry out Telnet, Web (World Wide Web) service etc., realize abundant monitoring management function.
But, present most embedded device, adopt MCU (microcontroller) to form low cost system as 4,8 or 16, consideration for simple and convenient and minimum hardware and software cost, all still adopt traditional low speed serial ports, via transmission channels such as RS232/RS485, MODEM (modulator-demodulator), E1, GPRS (GPRS), low voltage power line carriers, realize " three distant (remote measurement, remote signalling, remote control) " function in network management center.
Yet because the communications protocol of realization generally all is self-defining, different manufacturer, different equipment, communication protocol may be different, during the monitoring networking, need finish the conversion of these agreements respectively, and this version for software is stable and maintenance is very unfavorable.For example, certain headend equipment agreement increases data or parameter, and background net management software must correspondingly be changed, the parsing of change protocol massages, change user interface, change database etc.
After manufacturer sells embedded device, generally also to bear corresponding after-sale service.In the time can only finishing in this locality the monitoring management of equipment, often have following situation: the user finds that by network management center the equipment operation at remote unmanned place is unusual; Perhaps, on-site maintenance personnel be unfamiliar with equipment, thinks fault by mistake.Manufacturer has only the technical staff of the allowing scene of going on business, and by the man-machine interface of equipment, could find that just the parameter configuration of system is improper, or the misunderstanding of user/network management center and error reporting.Unnecessary travel meeting increases the maintenance cost of manufacturer greatly.
In addition, reducing cost is the problem that manufacturer must consider all the time.In the local monitor of finishing equipment, need realize man-machine interaction by keyboard and liquid crystal, this may make display such as liquid crystal occupy than great share in the device hardware cost.As remove display and just can lose human-computer interaction function, then cause user-friendliness to descend as substituting with cheap display.
Summary of the invention
The technical issues that need to address of the present invention provide a kind of method of utilizing serial ports to realize the embedded device Telnet, utilize the present invention to realize the far-end embedded device is carried out online diagnosis of remote live and maintenance, thereby reduced the maintenance cost of equipment vendors by serial ports.
In order to solve the problems of the technologies described above, the invention provides a kind of method of utilizing serial ports to realize the embedded device Telnet, the webmaster backstage intercoms with the embedded device of far-end mutually by serial ports, and this method comprises the steps:
(a) the webmaster backstage obtains the configuration information of far-end embedded device by serial ports, and this configuration information comprises having and is used for the input unit of man-machine interaction, the configuration information of output device in the far-end embedded device;
(b) according to the configuration information that obtains in the step (a), the webmaster backstage generates anthropomorphic dummy's machine interactive interface of far-end embedded device on the interface, client area, and this anthropomorphic dummy's machine interactive interface comprises analogue output unit interface and analogue input unit;
(c) serial ports is passed through on the webmaster backstage, send the current interface video data of the output device that obtains the far-end embedded device to the far-end embedded device, message, if the input unit on webmaster backstage has produced control command, include this control command in the then described message;
(d) after the far-end embedded device receives described message, the current interface video data of its output device is recycled to the webmaster backstage;
(e) if in the described message control command is arranged, the far-end embedded device carries out buffered to this control command, and according to the control command of this buffered, generate corresponding current interface video data within it in the display buffer that is provided with in depositing, then the current interface video data is sent to output device;
(f) after the webmaster backstage receives far-end embedded device current interface video data, on described anthropomorphic dummy's machine interactive interface, show described current interface data, and return step (c).
Further, the present invention also has following characteristics: the far-end embedded device generates the current interface video data and adopt following method when the webmaster backstage sends the current interface video data, steps of the method are:
(A) the far-end embedded device is divided into some smaller screens that are equal to size with current interface, and respectively to each smaller screen Allotment Serial Number, and divide the counter that is used in the corresponding smaller screen video data update times of statistics;
(B) when the far-end embedded device generates the current interface video data in the display buffer, total update times of the update times of each smaller screen video data of accumulative total and statistics whole interface.
(C) with the current interface video data and last time the interface display data compare, obtain delta data, and the pointer of the tail address of delta data and first address subtracted each other obtain the maximum data volume that transmits;
(D) if maximum transmission data volume is less, employing order load mode loopback current interface video data then, if maximum transmission data volume is big and total update times whole interface is less, then adopt coordinate load mode loopback current interface video data, otherwise adopt split screen load mode loopback current interface video data.
Further, the present invention also has following characteristics: described order load mode is that the data of transmission comprise the continuous data content between first address pointer, tail address pointer and the head and the tail two-address; Described coordinate load mode is that the data of transmission comprise X coordinate and the Y coordinate in the numerical value of each delta data, the corresponding delta data interface of living in; Described split screen load mode comprises the length and the data content of the video data of the sequence number of the smaller screen that video data changes, corresponding smaller screen for the data that transmit.
Further, the present invention also has following characteristics: if maximum transmission data volume is very big, the far-end embedded device needs advanced line data compression, and then adopts split screen load mode loopback current interface video data.
Further, the present invention also has following characteristics: when adopting split screen load mode loopback current interface video data, the far-end embedded device preferentially transmits crucial screen data, and crucial screen refers to that update times is many and has the important smaller screen in title, important information or position.
Further, the present invention also has following characteristics: formulate unified Telnet communication protocol between webmaster backstage and the far-end embedded device, this communication protocol comprises " obtaining device configuration information " message and response message thereof, " obtaining the equipment video data ", and response message.
Further, the present invention also has following characteristics, and described step (a) further can be divided into following steps:
(a1) the webmaster backstage sends " obtaining device configuration information " by serial ports to the far-end embedded device, message, and this message includes the field of webmaster identification information;
(a2) the far-end embedded device is according to " obtaining device configuration information " message that receives, its configuration information that is used for man-machine interaction of loopback is to the webmaster backstage, and this configuration information comprises the configuration information of input unit, the configuration information of output device, the data compression mode that device software adopts and the mode of cutting apart the interface.
Further, the present invention also has following characteristics, and described step (e) further can be divided into following steps:
(e1) the far-end embedded device takes out described control command from described message, and is stored to buffer storage unit;
(e2) the far-end embedded device goes out control command from the buffering cell array area;
(e3) according to the control command of taking out in the step (e2), generate corresponding current interface video data within it in the display buffer that is provided with during the far-end embedded device is deposited, and the current interface video data is sent to output device, adds up the update times of display buffer video data simultaneously with the hook program;
Further, the present invention also has following characteristics, and the input unit of described far-end embedded device and output device can be empty configuration.
Compared with prior art, the present invention has the following advantages:
1, adopt this method, can realize the Telnet of network management center the far-end embedded device, diagnosis of real-time online ground and maintenance of far end embedded device, thus reduced the maintenance cost of equipment manufacturers;
2, adopt the unified Telnet communication protocol of formulating in this method, can realize the remote centralized control of heterogeneous devices quickly and easily, when having overcome in the prior art at the monitoring of tools networking, the version poor stability that need finish the conversion of various different agreements and cause thus, the shortcoming of upgrade maintenance difficulty;
3, the input unit output device of far-end embedded device can be set to empty configuration in this method, and the function of harmless its man-machine interaction, thereby reduce the cost that embedded device is monitored networking.
Description of drawings
Fig. 1 is that this method utilizes serial ports to realize the schematic flow sheet of Telnet;
Fig. 2 is that the far-end embedded device generates the current interface video data and sends the schematic flow sheet of current interface method that video data adopts to the webmaster backstage in this method;
Fig. 3 is the maintenance platform structural representation that carries out the far-end embedded device is carried out Telnet in the specific embodiments of the invention.
Embodiment
Realize the method for embedded device Telnet for understanding the present invention in depth, the present invention is described in detail below in conjunction with drawings and the specific embodiments.
For example, equipment manufacturers have produced the power supply unit of A, B, C three kinds of models, be widely used in each telecom operators of the whole nation, according to maintenance platform as shown in Figure 3, link to each other with webmaster backstage (being the maintenance centre) via MODEM, GPRS passage respectively, the specific configuration information of equipment is as shown in the table.
Table 1 power supply unit configuration information table
| Unit type | Cost | Monochromatic LCD configuration | Number of keys | Communication speed | Communications protocol |
| A | High | 320*240 | 16 keys | 38400 | The X agreement |
| B | In | 240*64 | 4 keys | 19200 | The Y agreement |
| C | Low | 122*32 | 4 keys | 9600 | The Z agreement |
Be primarily aimed at B equipment below and be described explanation, the operation of A, C equipment is similar to B.
At first, formulate unified Telnet communication protocol, for reduce the resource consumption of Telnet to device software as far as possible, communications protocol needs simple, only comprises " obtaining device configuration information " message and response message thereof, " obtaining the equipment video data " message and response message thereof.Obviously, device software is supporting to answer this Telnet of priority treatment communication protocol message on original communications protocol basis.
The message frame form of this Telnet communication protocol is as follows:
| SOI | LEN | SN1 | SN2 | DEVICE | DATA | CHK | EOI |
Each field implication is as follows:
The SOI beginning flag
LEN " DATA " field length sign
SN1 sends sequence number
The SN2 Receive sequence number
DEVICE device name or address designation
DATA data cell content
The CHK check code
The EOI end mark
Wherein, the following content of " DATA " section:
| CID | RTN | INFO |
CID order control identification code
RTN response message: return code
INFO order or response message content
For " obtaining device configuration information ", " obtaining the equipment video data " two messages and response messages thereof, frame format is all identical, only is " DATA " section content difference:
For " obtaining device configuration information " message, " INFO " field data is the webmaster identification information, and " INFO " field data is the configuration information of far-end embedded device in its response message; For " obtaining the equipment video data " message, " INFO " field data is the interactive action of webmaster, also can be sky, and " INFO " field data is the video data that current interface changes in its response message.
At least comprise following content in " INFO " field in the loopback current interface video data message:
| CMP | FSN1 | FSN2 | FLAG | TYPE | LEN | MSG |
The compress mode that CMP adopts
The totalframes that FSN1 need transmit
The current transmission frame number of FSN2
FLAG transfer approach sign: be divided into three kinds of modes such as order load mode, coordinate load mode, split screen load mode;
TYPE " MSG " segment data type: original value or difference value
LEN " MSG " segment data length
The video data that MSG transmits
Secondly, the influence of analyzing communication time-delay.For B equipment, when renewal (full frame) is the 240*64/8=1920 byte because the maximum interface display data of its transmission, communication speed is 19200bps, therefore, when not carrying out data compression, about 1920/ (19200/10)=1 second of maximum synchronizing relay, the long friendly interface that influences of time-delay, therefore, need carry out data compression, need to include Huffman (Huffman) compression algorithm code in the device software.
Then, with the some smaller screens that are equal to size of being divided into of current interface.In general, split screen is got more tiny, can reduce the data volume of " split screen transmission " mode; But can allow the complicated point of algorithm, need the balance of combination interface displaying contents, carry out suitable split screen.Because B equipment adopts the lattice lcd of 240 * 64 resolution, Chinese character shows that type matrix is 16 dot matrix, therefore according to menu content, can carry out screen 3 * 4 split screen, and each smaller screen resolution is 80 * 16.
Then, in the B device software, realize menu function.Most embedded devices that can man-machine interaction all have menu function.B equipment is finished such as functions such as real time information demonstration, parameter setting, system's controls by menu.In addition, the image pattern display buffer of two blocks of liquid crystal is set in the internal memory of B equipment, wherein stores the current interface video data for one, another piece storage last time was sent to the interface display data on webmaster backstage; Because the liquid crystal of B equipment disposition is monochromatic 240 * 64 lattice lcd, then needs to be provided with two display buffers that memory headroom is the equal size of 240 * 64/8=1920 byte.And, after editmenu carries out the button processing, in current display buffer, generate the current interface video data, then the current interface video data in the display buffer is sent to liquid crystal display, the number of times that uses hook program statistics video data to be modified simultaneously.
At last, realize that by following flow process of the present invention flow process that Telnet to B equipment, the present invention realize the embedded device Telnet as shown in Figure 1, comprises the steps:
Step 101, webmaster backstage send " obtaining device configuration information " message by serial ports to B equipment (being the far-end embedded device), and " INFO " field data in this message comprises the webmaster identification information;
Step 102, after B equipment receives " obtaining device configuration information " message, through confirming, its configuration information message that is used for man-machine interaction of loopback is given the webmaster backstage, configuration information is as follows, input unit is 4 buttons, and title is respectively " going up page or leaf ", " nextpage ", " returning " and " affirmation ", and supports the combination button of " going up page or leaf+nextpage "; Output device is LCD (LCD), monochromatic demonstration, and the color figure place is 1, and resolution is 240 * 64, and the mode of cutting apart the interface is 3 * 4, and the arrangement mode of video data is transversely arranged; Software supports that compression algorithm is the Huffman compression;
Step 103 behind the configuration information response message of webmaster backstage reception from B equipment, is drawn the conformable display interface on the interface, client area, the LCD histogram that this simulation display interface is 240 * 64 resolution, and be divided into 3 * 4 smaller screens; In addition, 4 analogue-keys have also been drawn in the client area;
Step 104, the webmaster backstage sends " obtaining the equipment video data " message to B equipment, if the input equipment on webmaster backstage produces a certain control command (as the analogue-key with click " nextpage "), then include the field (as " nextpage " key assignments) of control command in this message;
Step 105, B equipment judge whether the key assignments of analogue-key according to " obtaining the equipment video data " message that receives, if do not have, then execution in step 106, otherwise execution in step 107;
Step 106, B equipment is recycled to the webmaster backstage with the current interface video data in the current display buffer via serial ports, and step 104 is returned at the current interface video data that conformable display interface display B equipment transmits in the webmaster backstage;
Step 107, B equipment takes out control command (as " nextpage " key assignments) from " obtaining the equipment video data " message that receives, and this control command is stored to buffer storage unit (as the key assignments buffering area, or FIFO, first-in first-out register), the video data of the current interface of loopback simultaneously is to the webmaster backstage; The current interface video data that transmit at conformable display interface display B equipment on the webmaster backstage;
Step 108, B equipment takes out control command (as " nextpage " key assignments) from buffering memory cell (as the key assignments buffering area);
Step 109, according to control command, the far-end embedded device generates new current interface video data (also can be described as and draw new current interface) in current display buffer, and exports LCD to, the number of times that is modified with hook program statistics video data returns step 104 simultaneously.
In " obtaining the equipment video data " message, " INFO " field information can comprise a plurality of key informations, as comprises the key assignments that issues all buttons between " obtaining the equipment video data " message for twice; The key assignments of these buttons is sent to B equipment in batches, can accelerates the response speed between the AM/BAM.
Lower and the microprocessor computing is after a little while consuming time when serial communication speed, the communication of interface display data is the principal elements that cause the AM/BAM time-delay.Therefore, need to adopt the algorithm of optimizing to reduce conveying capacity, it is consuming time to reduce communication.Among the present invention B equipment generate the current interface video data and send to the webmaster backstage current interface method that video data adopts flow process as shown in Figure 2, comprise the steps:
Step 201, the interface that B equipment will be drawn in the display buffer are divided into 3 * 4 and are equal to big or small smaller screen; And give each smaller screen Allotment Serial Number sum counter, use W respectively
0, W
1, W
2... the number of times that corresponding screen video data upgrades is represented in expression, each counter, the subscript 0,1,2 of each screen ... 11 represent the sequence number of smaller screen respectively;
Step 202, all counters is clear 0, and promptly all counter initial values are 0, the interface display data transmit finish after, also with all counters clear 0;
Step 203 according to control command (as the key assignments of button), is drawn new interface in current display buffer;
Step 204 is called the update times that Hook Function adds up each smaller screen video data;
Step 205 is judged whether interface in the current display buffer draws to finish, if complete execution in step 206, otherwise execution in step 203;
Step 206 is called total update times that Hook Function is added up whole interface, and computing formula is as follows: W=W
0+ W
1+ W
2+ ... W
11
Step 207 is carried out otherness to graph data and is handled, be about to the current interface video data and last time the interface display data carry out XOR, obtain delta data, obviously, be 0 value behind the unchanged data operation;
Step 208, the first address and the tail address of inquiry delta data, first address can non-0 value of sequential search obtain in the smaller screen of first variation, and backward is searched non-0 value and is obtained in the smaller screen of a tail address variation in the end;
Step 209 is subtracted each other tail address pointer and first address pointer, obtains maximum transmission data volume N;
Step 210 judges whether the N value is less, if then execution in step 211, otherwise execution in step 212;
Step 211 selects employing order load mode to transmit, and the order load mode is this a N continuous data content for the data that transmit comprise first address pointer and tail address pointer subsequently, until the transmission of finishing video data, finishes;
Step 212 judges whether the W value is less, if, execution in step 213, otherwise execution in step 214;
Step 213 selects to adopt the coordinate load mode to transmit, and the coordinate load mode is followed successively by the numerical value of each delta data and X coordinate, the Y coordinate in the residing interface of these data for the data that transmit, and until the transmission of finishing video data, finishes;
Step 214 judges whether the N value is very big, if, execution in step 215, otherwise execution in step 216;
Step 215 is compressed the The data Huffman compression algorithm that needs transmit;
Step 216 selects to adopt the split screen load mode to transmit, and the split screen load mode is for transmitting the smaller screen data that video data changes, and the data content of transmission is followed successively by the sequence number of smaller screen, the length of smaller screen video data and data content; When data volume was very big, separable frame transmitted, and also can once transmit a plurality of smaller screen contents, and simultaneously, B equipment will preferentially transmit crucial screen data, and crucial screen refers to the smaller screen that update times is many and has the showy smaller screen in title, important information or position;
Step 217 is judged whether video data transmits to finish, if do not have, then execution in step 216;
Step 218 finishes.
Similarly, A, C equipment also can be realized Telnet and webmaster according to above step.Since at present a lot of at this three kind equipment of telecommunications online operation, make that the engineering maintenance workload of equipment manufacturers is very big, many full-time attendants often go on business, and maintenance cost is very high.Therefore, set up a maintenance platform, carry out diagnosis long-range, real-time online and maintenance, it is very necessary reducing unnecessary going on business, as shown in Figure 3.
When the user of various places reflected that equipment operation is undesired, the maintenance centre can pass through transmission channels such as GPRS, MODEM, is remotely logged into each equipment, carry out the diagnosis and the maintenance of real-time online, reduce maintenance cost, improve service response speed greatly simultaneously, improve service quality.
For equipment manufacturers, under the pressure of market competition and the pressure that falls cost, the LCD display of A, B, C equipment disposition is more and more littler, thereby causes the friendly of user interface and the convenience of operation all to decrease.Because most equipment are all monitored networking, therefore can finish demonstration and mutual by the display at user monitoring center.For equipment C, can in software, change editmenu, make this menu identical with B equipment, operate on 240 * 64 the virtual LCD, save hardware LCD; By Telnet, the monitoring to C equipment just can be realized in the user monitoring center.For two kinds of equipment of B, C, what the user saw in Surveillance center all is the user interface of identical size, identical style; If the raising communication speed can also realize that 640 * 480 virtual VGA shows, user interface is just friendly more.In addition, demonstration can be amplified to menu interface by Surveillance center, reduces the discomfort of the on-the-spot small size LCD operation of user.
Adopt the present invention, can reduce the maintenance cost of equipment vendors, by serial ports the far-end embedded device is carried out Telnet, realization remotely, real-time online ground is diagnosed and maintenance; Simultaneously, unified Telnet communication protocol is provided, make different types of equipment all can realize monitoring networking easily, overcome and to have resolved respectively at every kind of agreement in the prior art and cause the version poor stability, the shortcoming of upgrade maintenance difficulty realizes the monitoring of heterogeneous devices quickly and easily; In addition, at the embedded device of networking, display device and keyboard etc. can be set to empty configuration, and can't harm the function of its man-machine interaction, thereby can reduce the hardware cost of equipment greatly.
Claims (9)
1, a kind of method of utilizing serial ports to realize the embedded device Telnet, the webmaster backstage intercoms with the embedded device of far-end mutually by serial ports, it is characterized in that, and this method comprises the steps:
(a) the webmaster backstage obtains the configuration information of far-end embedded device by serial ports, and this configuration information comprises having and is used for the input unit of man-machine interaction, the configuration information of output device in the far-end embedded device;
(b) according to the configuration information that obtains in the step (a), the webmaster backstage generates anthropomorphic dummy's machine interactive interface of far-end embedded device on the interface, client area, and this anthropomorphic dummy's machine interactive interface comprises analogue output unit interface and analogue input unit;
(c) serial ports is passed through on the webmaster backstage, send the message of the current interface video data of the output device that obtains this far-end embedded device to the far-end embedded device, if the analogue input unit on webmaster backstage has produced control command, include this control command in the then described message;
(d) after the far-end embedded device receives described message, the current interface video data of its output device is recycled to the webmaster backstage;
(e) if in the described message control command is arranged, the far-end embedded device carries out buffered to this control command, and
According to the control command of this buffered, generate corresponding current interface video data within it in the display buffer that is provided with in depositing, then the current interface video data is sent to output device;
(f) after the webmaster backstage receives far-end embedded device current interface video data, on described anthropomorphic dummy's machine interactive interface, show described current interface video data, and return step (c).
2, the method for utilizing serial ports to realize the embedded device Telnet according to claim 1, it is characterized in that, the far-end embedded device generates the current interface video data and adopt following method when the webmaster backstage sends the current interface video data, steps of the method are:
(A) the far-end embedded device is divided into some smaller screens that are equal to size with current interface, and respectively to each smaller screen Allotment Serial Number, and divide the counter that is used in the corresponding smaller screen video data update times of statistics;
(B) when the far-end embedded device generates the current interface video data in the display buffer, total update times of the update times of each smaller screen video data of accumulative total and statistics whole interface;
(C) with the current interface video data and last time the interface display data compare, obtain delta data, and the pointer of the tail address of delta data and first address subtracted each other obtain the maximum data volume that transmits;
(D) if maximum transmission data volume is less, employing order load mode loopback current interface video data then, if maximum transmission data volume is big and total update times whole interface is less, then adopt coordinate load mode loopback current interface video data, otherwise adopt split screen load mode loopback current interface video data.
3, the method for utilizing serial ports to realize the embedded device Telnet according to claim 2 is characterized in that: described order load mode is that the data of transmission comprise the continuous data content between first address pointer, tail address pointer and the head and the tail two-address; Described coordinate load mode is that the data of transmission comprise X coordinate and the Y coordinate in the numerical value of each delta data, the corresponding delta data interface of living in; Described split screen load mode comprises the length and the data content of the video data of the sequence number of the smaller screen that video data changes, corresponding smaller screen for the data that transmit.
4, the method for utilizing serial ports to realize the embedded device Telnet according to claim 3, it is characterized in that: if maximum transmission data volume is very big, the far-end embedded device needs advanced line data compression, and then adopts split screen load mode loopback current interface video data.
5, the method for utilizing serial ports to realize the embedded device Telnet according to claim 4, it is characterized in that: when adopting split screen load mode loopback current interface video data, the far-end embedded device preferentially transmits crucial screen data, and crucial screen refers to that update times is many and has the important smaller screen in title, important information or position.
6, the method for utilizing serial ports to realize the embedded device Telnet according to claim 5, it is characterized in that: formulate unified Telnet communication protocol between webmaster backstage and the far-end embedded device, this communication protocol comprises " obtaining device configuration information " message and response message, " obtaining the equipment video data " and response message thereof.
7, the method for utilizing serial ports to realize the embedded device Telnet according to claim 6 is characterized in that described step (a) further can be divided into following steps:
(a1) the webmaster backstage sends " obtaining device configuration information " message by serial ports to the far-end embedded device, and this message includes the field of webmaster identification information;
(a2) the far-end embedded device is according to " obtaining device configuration information " message that receives, its configuration information that is used for man-machine interaction of loopback is to the webmaster backstage, and this configuration information comprises the configuration information of input unit, the configuration information of output device, the data compression mode that device software adopts and the mode of cutting apart the interface.
8, the method for utilizing serial ports to realize the embedded device Telnet according to claim 7 is characterized in that described step (e) further can be divided into following steps:
(e1) the far-end embedded device takes out described control command from described message, and is stored to buffer storage unit;
(e2) the far-end embedded device goes out described control command from the buffering cell array area;
(e3) according to the control command of taking out in the step (e2), generate corresponding current interface video data within it in the display buffer that is provided with during the far-end embedded device is deposited, and the current interface video data is sent to output device, adds up the update times of display buffer video data simultaneously with the hook program.
9, the method for utilizing serial ports to realize the embedded device Telnet according to claim 8 is characterized in that: the input unit of described far-end embedded device and output device are empty configuration.
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