KR20060116448A - Methode for processing communication collision in device link system based television - Google Patents

Abstract

A communication impact processing method in a device link system based on a TV is provided to prevent an error from being generated in message transmission by communication impact by connecting slave devices of various types to a master device like a digital TV by a daisy chain type by using a stereo jack, generating a request message and a response message transmitted between the master device and the slave devices as a certain format, and transmitting and receiving the request message and the response message. When communication impact between a master device of a device link system based on a TV and a plurality of slave devices is generated, the master device selectively processes only a message of the slave device finally connected. The slave devices except for the slave device in which the message is selectively processed judge the communication impact and a communication state, and resume message transmission. The communication impact occurs while one master device is communicated with N slave devices.

Description

Method for processing communication collision in device link system based television

1 shows an overall configuration of a device link system according to the present invention,

2 illustrates a stereo jack applied to a device link system according to the present invention,

Figure 3 illustrates an embodiment of a television remote control applied to the device link system according to the present invention.

4 illustrates an embodiment of an interface structure of a slave device to which the present invention is applied;

FIG. 5 illustrates an embodiment in which a master device and a slave device to which the present invention is applied transmit and receive a command through a daisy chain method.

6 illustrates a configuration of a request message format according to the present invention;

7 illustrates a configuration of a response message format according to the present invention;

8 illustrates an embodiment in which a request message and a response message are transmitted / received according to the present invention.

9 illustrates an embodiment in which a request message is retransmitted according to the present invention;

10 illustrates an embodiment of a communication collision processing procedure according to the present invention.

?? Explanation of symbols for main parts of the drawings

10: digital television 11: set-top box

12: V13 13: DVD recorder

14: receiver 110: jack connector

111: line driver 112: microcomputer

The present invention relates to a communication collision processing method in a device link system based on a television. For example, various types of A / V devices installed in a home can be connected by using a digital television. In addition, the present invention relates to a communication collision handling method in a television-based device link system that enables a user to more conveniently control the desired A / V device.

In recent years, digital televisions (D-TVs) capable of outputting and displaying high-definition video and high-quality audio have been widely used and commercialized. For example, digital TVs (VCRs) and DVD recorders (DVDs) are available. -Recorder, and Set Top Box (STB) can be connected.

Meanwhile, the DVD recorder or set-top box may include a hard disk recorder (HDD-Recorder) capable of recording and storing digital data in a large recording medium such as a hard disk (HDD).

In addition, a receiver capable of three-dimensionally outputting high-quality multi-channel (eg, 5.1 CH) audio through a plurality of speakers may be connected to the digital television. The receiver may be connected to a VCD or a DVD. Combi-Home Theater, a combination product that includes a recorder, can be used.

Then, the user selectively controls the devices connected to the digital television to watch analog audio and video played in the VR or digital audio and video played in the DVD recorder, or the set top. Audio and video of the digital broadcast received through the box can be viewed.

In addition, a user may control the combination home theater so that high-quality multi-channel audio is three-dimensionally output through a plurality of speakers, and a video screen displayed through the digital television and a plurality of speakers are output. Multi-channel audio can be heard in three dimensions.

However, in order to control the operation of the V-Cal, DVD recorder, set-top box, and combination home theater connected through a digital television as described above, the user has to operate the remote control of the device, which is inconvenient in use. Of course, the problem that takes a long time to control the operation of the desired device occurs.

Accordingly, the present invention was devised to solve the above problems, and for example, various types of slave devices, such as a V-CD, a DVD recorder, a set-top box, and a receiver, which are installed in a home, can be used by using a stereo jack. In connection with a master device such as a digital television, in an easy chain method, a request message and a response message transmitted and received between the master device and the slave devices are generated and transmitted in an optimized predetermined format, and a message is transmitted due to a communication conflict. It is an object of the present invention to provide a method for dealing with communication collision in a television-based device link system to prevent an error from occurring.

In the communication collision processing method in a television-based device link system according to the present invention for achieving the above object, communication origination between a master device and a plurality of slave devices of the television-based device link system occurs. In step 1, the master device selects and processes only messages of the last connected slave device; and in a slave device other than the slave device in which the message is processed, determining communication origination and communication status, and transmitting a message. Characterized in that it comprises a two steps to retry,

In addition, the communication collision occurs while communication between the master device and the plurality of slave devices is performed in a 1: N manner, and at the front end of the message, at least one byte of data having a specific value distinguished from a valid message The master device is configured to process a valid message received thereafter based on the data of the specific value when a communication collision occurs.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, a preferred embodiment of a communication collision processing method in a television based device link system according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an overall configuration of a device link system based on a television according to the present invention. For example, a set top box 11, a BC12, Various types of devices, such as the DVD recorder 13, the receiver 14, and the like, are connected to the digital television 10 through an A / V signal line, respectively.

In addition, as shown in FIG. 1, the devices are serially connected and connected to the digital television 10 through a daisy chain type control line. For example, in addition to a plurality of signal input / output ports for transmitting and receiving A / V signals with each device, the digital television 10 includes one stereo jack port for a control line with the set-top box 11. Stereo Jack Port) is provided separately.

Meanwhile, the set top box 11 is provided with two stereo jack ports for a control line with the digital television 10 and a control line with a V-CAL 12. Two stereo jack ports are provided for the control line with the set top box 11 and the control line with the DVD recorder 13.

In addition, the DVD recorder 13 includes two stereo jack ports for a control line with the VRC 12 and a control line with the receiver 14 such as a Combi-Home Theater. The receiver 14 is provided with two stereo jack ports for a control line with the DVD recorder 13 and a control line (unassigned) with any other device.

On the other hand, the stereo jack, for example, as shown in Figure 2, 3.5mm stereo jack mainly used in general personal computer (PC) or earphone, etc. can be used, as described above in a daisy chain method through the stereo jack In addition to a plurality of key buttons for selecting and controlling a television function, the remote controller for operating and controlling a digital television connected to each device operates each device connected in a daisy chain manner. Key buttons for control are additionally assigned.

For example, assuming that the device link system according to the present invention is an 'XLink' system, the remote control includes a key button for turning on / off the TV and the XLink devices, as shown in FIG. Key buttons for providing a graphical user interface (GUI) screen and key buttons for selectively outputting audio output through a TV or a home theater are additionally allocated.

In the set-top box 11 connected to a device connected in a daisy chain manner through a stereo jack, for example, a digital television, which is a master device, and operated as a slave device, as shown in FIG. As shown, the jack connector 110, the line driver 111, and the microcomputer 112 is configured to include.

On the other hand, the request command received from the digital television 10 via the jack connector 110 of the set top box, via the R1_In / Out terminal of the line driver 111, to the microcomputer 112. At the same time as the input, it is transmitted through the T2_In / Out terminal of the line driver 111 to the VRC 12 connected to the other stereo jack input / output port of the jack connector 110.

On the other hand, when a response command is generated by the microcomputer 112 of the set top box, the response command is input / output of the jack connector 110 via the T1_In / Out terminal of the line driver 111. When a response command is generated from the V12 or the like, the response command is transmitted via the R2_In / Out terminal and T1_In / Out of the line driver 111. And the digital television 10 connected to the input / output port of the jack connector 110.

In addition, in the digital television 10, for example, when performing a system booting operation, as shown in FIG. 5, a request command (for example, DiscoverDevices) for confirming connection of each slave device is generated. The request command is serially transmitted to the respective devices through a series of daisy chain methods described above with reference to FIG.

Each device receiving the request command generates a corresponding response command (eg, Slave1Res (), Slave2Res () ...), and the response command is digitally daisy-chained. Since it is transmitted to a television, in the digital television, each device currently linked can be identified, and a request message format transmitted / received between the digital television operated as the master device and the respective devices operated as the slave device. (Request Message Format) and Response Message Format are explained in detail as follows.

Fig. 6 shows a configuration of a request message format according to the present invention. For example, a request message transmitted from a digital television which is a master device includes a header type and a destination address. A destination address, a source address, a length, a command, and N data blocks 1 to N and checksum information are sequentially recorded.

7 illustrates a configuration of a response message format according to the present invention. For example, a header is included in a response message transmitted from a slave device, a DB recorder, a set-top box, a reserver, and the like. Type (Header Type), Destination Address, Source Address, Length, Command, Response Code, and N Data Blocks (Data Block 1 ~ N) And checksum information are recorded in order.

Meanwhile, when transmitting the request message or the response message, as shown in FIGS. 6 and 7, '0xFF 0xFF' is first transmitted. When a message collision occurs, the slave devices detect the fact. Also, it is used to recover data in which a message transmission error occurs in a digital television which is a master device.

And. The header information indicates a start of a message. In the case of a request message, for example, 5 bits of '10001' for indicating a corresponding message type and 3 bits for indicating a corresponding version. '001' is recorded, and in the case of a response message, a 5-bit '10010' for indicating a corresponding message type and a 3-bit '001' for indicating a corresponding version may be recorded.

In addition, an 8-bit physical ID and a logical ID assigned to the corresponding device to receive the message are recorded in the destination address, and the source address is assigned to the corresponding device transmitting the message. 8-bit physical ID and logical ID are recorded. The physical ID is assigned a unique value for each product type, and the logical ID is included in the corresponding product. Each unit is assigned a unique value.

For example, when the DVD recorder is a combination device including a hard disk recorder (HDD-Recorder) inside the device, the combined product is assigned one physical ID and two logical IDs. If the request message and the response message correspond to each other, the destination address and the source address are exchanged with each other, but the request message and the corresponding response as the 'DiscoverDevices' command described above with reference to FIG. Since the messages correspond to 1: N, the destination address and the source address do not change exceptionally.

And, the length information indicates the number of bytes corresponding to the total message length from the header information to the checksum, and the command is a specific command to be transmitted, and the data block corresponds to when additional information is to be transmitted. Information is recorded in a data block and transmitted. Depending on the type of the command, the existence and length of the data block are determined as optional.

On the other hand, in general, information is divided into units of 1 byte, but the data block is classified by a detailed format rather than 1 byte. When an unused lower bit occurs among data blocks, it is filled with '0' and transmitted. In addition, the response code is included only in the response message, the success or failure of the request message (OK, Error) is recorded, the check sum is used to detect the message error, except for the check sum A specific value that XORs all message data is recorded.

The message transmission method between the master device and the slave devices uses, for example, an RS232C transmission method. The start bit uses '1' and the stop bit uses '0'. The baud rate is 9600bps, and no parity, and a half duplex method is used for communication.

In addition, the LSB First transmission method that first transmits a Least Significant Bit (LSB) is used. As shown in FIG. 8, a slave device receiving a request message transmits a response message within 50 ms, and has a maximum response delay. The time should be less than 200 ms, and as shown in FIG. 9, the master device retransmits when the waiting time for the response exceeds 200 ms after transmitting the request message, wherein the retransmission is repeated one or more times. Done.

In the master device, if a response message is received after transmitting the request message, the master device waits 10 ms or more until the next request message is transmitted, and the internal byte interval of the message is maintained within 5 ms. When the master device receives the standby response RES_WAIT instead of the ok response RES_OK as a response message, the master device informs that the processing speed of the slave device is slow and that the current processing is in progress.

On the other hand, if the master device wants to know the exact completion time, the same request message can be repeatedly transmitted later according to the processing criteria, and finally the slave device responds with an OK response (RES_OK), and a standby response (RES_WAIT). The master device, for example, displays a user interface message similar to 'during XLink communication', so that the user can know the processing delay.

In the master device, if only the standby response WAIT_RES is continuously received for 1 s without the ok response RES_OK, the slave device treats the error as an error of the slave device and stops the communication, even after retransmitting the request message. If not, it determines that there is no device, and outputs the corresponding guide screen for the user to know.

On the other hand, as shown in Figure 10, when the communication between the master device and the plurality of slave devices (Slave 1 to n) is performed in a 1: N manner, a collision occurs in the communication process, for example In most slave devices ((Slave 1 to n-1), it basically knows whether the communication stage is currently communicating, and also knows when another slave device has a communication collision when it is in communication. Can be.

However, since the daisy chain method is used in the hardware structure, the last connected slave device (Slave n) does not know whether another slave device is in communication. Therefore, the master device considers this in advance. Thus, when a communication collision occurs between each slave device, only the message of the last connected slave device (Slave n) is screened.

On the other hand, other slave devices except the last connected slave device, ie, the last connected slave device, after detecting a communication collision itself, and generates a message again and transmits to the master device.

For example, in the slave device, as described above with reference to FIGS. 6 and 7, a special control character of “0xFF 0xFF” is transmitted in front of a request message or a response message, which is a message of the slave device. On the master device that received the message collision, it is used to recover the last received message normally.

That is, the master device searches for the header of the request message or the response message received continuously with " 0xFF ", ignores the message in which an error occurs due to a collision, and starts normally from the header of the newly received request or response message. The reason for not simply processing "0xFF" by one byte alone is that there is a possibility of being mistaken as a checksum.

On the other hand, since the slave device does not transmit the "0xFF" pattern among the transmitted messages as general data except for the collision process and the checksum, the master device receiving the error incorrectly determines "0xFF". If a collision is detected in the slave device, the current message transmission is interrupted, and after waiting for a predetermined time, for example, at least 20 ms, the communication state is determined, and the message transmission is again performed. Will try.

Accordingly, while communication between the master device and the plurality of slave devices is performed in the 1: N manner, even if a message conflict occurs, the message of the last slave device connected in the daisy chain hardware structure is selectively processed and the message is processed. In the other remaining slave devices, the communication collision and the communication state are judged by themselves, and the message is retransmitted, thereby preventing an error in the message transmission due to the communication collision.

As described above, preferred embodiments of the present invention are disclosed for purposes of illustration, and those of ordinary skill in the art can further various other embodiments within the spirit and technical scope of the present invention disclosed in the appended claims. Improvements, changes, substitutions or additions will be possible.

The communication collision processing method in the television-based device link system according to the present invention constructed and constructed as described above may be, for example, various types of slaves, such as a VRC, a DVD recorder, a set-top box, and a receiver installed in a home. Devices can be connected and connected to a master device such as a digital television in a daisy chain manner using a stereo jack, and also generate and transmit a request message and a response message transmitted and received between the master device and the slave devices in an optimized predetermined format. However, while communication between the master device and the plurality of slave devices is performed in a 1: N manner, even if a message conflict occurs, the message of the last connected slave device is selectively processed in a daisy chained hardware structure, In the other slave devices that are not processed, the communication collision and communication status are judged on their own, and the message is retransmitted, thereby preventing an error in message transmission due to the communication collision. It is a very useful invention to be able to control the operation more conveniently and accurately.

Claims (5)

In the case where communication origination between a master device and a plurality of slave devices of the device link system based on television occurs, the master device selects and processes only the messages of the last connected slave device; and In a slave device other than the slave device for which the message has been screened, two steps of determining a communication origination and a communication state and retrying the message transmission are included in the device link system based on the television. How to handle communication conflicts. The method of claim 1, Wherein the communication collision occurs while communication between a master device and a plurality of slave devices is performed in a 1: N manner. The method of claim 1, In the front end of the message, a data conflict processing method for a television-based device link system, characterized in that the data of a specific value distinguished from the valid message is transmitted at least two bytes. The method of claim 3, wherein And at the master device, when a communication collision occurs, processes valid messages received thereafter based on the data of the specific value. The method of claim 1, The slave device, when a communication collision occurs, waits for a predetermined time, determines the communication state, and retry message transmission, characterized in that the communication link processing method in a television based device link system.

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