KR20060116445A - Methode for transmitting and receiving message in device link system based television - Google Patents

Abstract

A message transmitting and receiving method in a device link system based on a TV is provided to more efficiently and conveniently operate and control a device for which a user wishes by connecting devices of various types such as a VCR(Video Cassette Recorder), a DVD(Digital Video Disc) recorder, a set-top box, and a receiver to a digital TV by a daisy chain type by using a stereo jack, and operating a remote controller of the digital TV. A master device of a device link system based on a TV generates a request message, and transmits the generated request message to a slave device. The slave device receives the request message, generates a response message, and transmits the generated response message to the master device. The master device selectively determines whether to retransmit the request message according to whether the response message is received.

Description

Method for transmitting and receiving message 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.

※ Explanation of code for main part of drawing

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 method of transmitting and receiving messages in a television-based device link system. For example, by connecting various types of A / V devices installed in a home based on a digital television, The present invention relates to a method of transmitting and receiving a message in a device link system based on a television for enabling a user to more conveniently control a 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 has been created to solve the above problems, for example, various types of devices such as V-Cal, DVD recorder, set-top box, and receiver installed in the home, such as stereo jack (Stereo Jack) By using a daisy chain method to connect and connect to a digital television, and to operate the remote control of the digital television, a television based system for enabling a user to efficiently and conveniently control a desired device. It is an object of the present invention to provide a method for transmitting and receiving messages in a device link system.

The message transmission and reception method in the television-based device link system according to the present invention for achieving the above object, in the master device of the device link system based on the television, generates a request message and transmits to the slave device Step 1 to do; Generating a response message from the slave device receiving the request message and transmitting the response message to the master device; And in the master device, selectively determining whether to retransmit the request message according to whether the response message is received.

In addition, the request message includes a header type, a destination address, a source address, a length, a command, and N data blocks and check sum information in order. In front of the request message, a ' A value of 0xFF 'is additionally transmitted by 2 bytes or more, and the response message includes a header type, a destination address, a source address, a length, a command, a response code, and N data blocks and checksum information in order. In front of the response message, a value of '0xFF' for message collision prevention is additionally transmitted by 2 bytes or more.

Hereinafter, a preferred embodiment of a message transmission and reception 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.

In addition, the message transmission method between the master device and the slave devices uses, for example, an RS232C transmission method. The start bit is '1', and the stop bit is '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.

Or more, preferred embodiments of the present invention described above, for the purpose of illustration, those skilled in the art, within the technical spirit and the technical scope of the present invention disclosed in the appended claims below, to further improve various other embodiments Changes, substitutions or additions will be possible.

The message transmission and reception method in the television-based device link system according to the present invention constituted and constructed as described above, for example, various types of devices, such as VRC, DVD recorder, set-top box, and receiver installed in the home By connecting to a digital television in a daisy chain method using a stereo jack, a request message and a response message transmitted and received between the digital television and each device are connected. By defining, generating, and transmitting in an optimized predetermined format, message transmission and reception between the digital television and each device can be efficiently performed, and the user can operate the remote control of the digital television to more conveniently control the desired device. Very useful to be able to It is an invention.

Claims (11)

At a master device of a television-based device link system, generating a request message and transmitting it to a slave device; Generating a response message from the slave device receiving the request message and transmitting the response message to the master device; And And in the master device, selectively determining whether to retransmit the request message according to whether the response message has been received or not. The method of claim 1, In the request message, a header type, a destination address, a source address, a length, a command, and N data blocks and check sum information are sequentially recorded, and in front of the request message, '0xFF' for preventing a message collision. A message transmission and reception method in a television-based device link system, wherein a value is transmitted by two or more bytes. The method of claim 1, In the response message, a header type, a destination address, a source address, a length, a command, a response code, and N data blocks and checksum information are sequentially recorded. In the front of the response message, message collision prevention is performed. The method of transmitting and receiving a message in a device link system based on a television, characterized in that '0xFF' value is transmitted by two or more bytes. The method according to any one of claims 2 and 3, The message information transmitting and receiving method in a device link system based on a television, characterized in that the message type information and version information is recorded in the header information. The method according to any one of claims 2 and 3, In the destination information, a physical ID and a logical ID assigned to the device to receive the message are recorded, and the physical and logical IDs assigned to the device composing the message are recorded in the source information. Method of transmitting and receiving a message in a television based device link system. The method of claim 5, The physical ID is assigned to a unique value for each product type, and the logical ID is assigned to a unique value for each internal structural unit included in the corresponding product, and one physical ID and one or more logical IDs are linked and recorded. Message transmission and reception method in a device link system based on a television, characterized in that. The method of claim 5, In the device link system based on the television, the destination address and the source address are interchanged when the request message and the response message are 1: 1 corresponded, but do not change when the 1: N correspondence is corresponded. How to send and receive messages. The method according to any one of claims 2 and 3, The presence and the length of the data block is selectively determined according to the type of the command, message transmission and reception method in a television-based device link system. The method of claim 1, When the master device transmits the request message and receives a standby response instead of an ok response as a response message, the master device displays on the guide screen that the processing is in progress due to a slow processing speed of the slave device. Message transmission and reception in a device link system. The method of claim 1, In the master device, after receiving the request message, if the standby response is continuously received for a predetermined period of time as a response message, the master device treats it as an error of the slave device and stops the communication. Message transmission and reception method in a device link system based on the. The method of claim 1, In the master device, if the response message is not received even after resending the request message, the device determines that there is no device and displays the fact on the guide screen. Way.

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