KR19980021943A - Data communication format and its control method for wireless remote control - Google Patents

Abstract

The present invention relates to a data communication format for wireless remote control and a method of controlling the same. The present invention relates to a synchronization bit unit for synchronizing, an identification code unit for discriminating its own data, and a parity for detecting an error. Providing a data communication format including an error detection unit including a checksum bit and a CHECK SUM bit, comparing the received signal with the data format, synchronizing the received signal, distinguishing whether the received data is own data, By providing a method of controlling the data format consisting of the process of determining the presence or absence of data errors, it is possible to improve the reliability of the communication to ensure the safety of the system, and to prevent accidents due to equipment malfunctions.

Description

Data communication format and its control method for wireless remote control

The present invention relates to a data communication format for wireless remote control and a control method thereof. More particularly, the present invention relates to data for accurately identifying, effectively synchronizing, and detecting the presence of an error in asynchronous serial communication for wireless remote control. The present invention relates to a data communication format and a method of controlling the same for a wireless remote control that can improve communication reliability and secure a system by providing a format and a control method thereof.

In general, data communication is divided into a transmitter for launching data into a space in the form of radio waves and a receiver for analyzing received radio waves to find their own data to move or control the equipment.

In order for the transceiver to perform smooth data communication, the receiver must receive and synchronize the data transmitted at any moment by the transmitter, and the contents of the data synchronized to find the necessary data among the numerous radio waves floating in the space are provided. You should be able to identify your data.

Conventionally, when performing data communication, in order to synchronize the asynchronous serial communication, when transmitting the first data, an identification code and actual data are transmitted after transmitting a synchronization signal of a certain pattern. However, the above method causes a system malfunction when an error occurs in the actual data.

Normally, the data that caused an error is discarded and the data of the next frame is received again. However, when the communication is performed in the same manner as above, the error cannot be distinguished even if an error occurs.

For example, if an even number of signals, such as 2 bits, 4 bits, and 6 bits, are simultaneously changed within a single byte signal due to noise during communication, it is as if no error has occurred.

In order to solve the above problems, various methods have been proposed and work relatively safely. However, if the system is interrupted by external noise or other equipments, it often causes system down or malfunction. Occurs. When malfunctions occur in the construction equipment, there is a problem that is directly connected to the damage to life as well as enormous property damage.

Accordingly, an object of the present invention is to solve the above problems, and an object of the present invention is to provide a data format and a control method which are essential for the construction of a communication system which does not receive unnecessary signals by searching for unwanted external noise in advance. The present invention provides a data communication format and a control method for wireless remote control that can prevent accidents due to malfunction of equipment by giving a high reliability to communicate with each other and give a confidence to customers.

1 is a block diagram of data communication to which the present invention is applied;

2 is a flowchart showing operation of a transmitter of data communication to which the present invention is applied.

3 is a flowchart showing operation of a receiver of data communication to which the present invention is applied.

4 is a configuration diagram of a data format according to the present invention.

* Explanation of symbols used in the main part of the drawing

10, 15: microcomputer

11, 14: modem

12, 13: radio frequency device

100: transmitter

200: receiver

40: Sync bit section

45: current channel

50: identification code

55: mode

60: status information

61: E / S (Emergency Stop)

62: P / F (Power Failure)

63: SLP (Sleep; Sleep)

70: input data section

80: error detection unit

81: horizontal parity bit

82: CHECKSUM bit

A feature of the present invention for achieving the object as described above, in the data communication format for wireless remote control, is to synchronize between the transmitter and the receiver, to separate their data at the receiver, and to accurately detect the presence or absence of errors. The present invention provides a data format and a method of controlling the same.

Hereinafter, a data communication format and a control method for a wireless remote control according to the present invention will be described in detail with reference to the accompanying drawings.

Referring to a block diagram of data communication to which the present invention shown in FIG. 1 is applied, the transmitter 100 modulates digital data output from the microcomputer 10 into analog data for data communication through the modem 11. Then, the data modulated by the modem 11 is continuously launched into the free space in the form of radio waves through the radio frequency device 12. The receiver 200 receives radio waves continuously emitted from the transmitter 100 through the radio frequency device 13 and demodulates them using the modem 14 in the form of original digital data. The demodulated data through the modem 14 is analyzed by the microcomputer 15.

2 and 3 are flowcharts of operations of a transmitter and a receiver, respectively, and show an operation procedure of a transceiver system of data communication to which the present invention is applied.

Referring to FIG. 2, the operation of the transmitter 100 will be described first, and the microcomputer 10 initializes the system (S1), and checks the system such as the states of RAM and ROM in the microcomputer 10 (S2). If it is determined that the system is in a normal power supply (S3), and it is determined that the system is not in normal power supply, it is checked whether a predetermined time has elapsed (S4). If the predetermined time has not elapsed, the control unit returns to the above-described step (S3) and returns to normal. Determine whether the power is on. If the normal power supply, stop the timer installed to check the predetermined time (S5), switch the state of the transmitter to the reception mode to search whether there is an empty channel in the frequency band to be used, and search the channel (S6) . At this time, it is determined whether the channel is in use by checking the intensity of propagation of the corresponding channel (S7). If it is determined that the channel is in use in this step (S7), it switches to another channel (S8) and returns to the above-described step (S7). The feedback is then repeated to determine if the channel is in use. If the channel is not in use, the state of the transmitter is switched to the transmission mode in order to transmit data (S9).

Subsequently, the controller receives an input signal from the operation panel and examines the operation signal to determine whether it is formatted according to the data format (S10), and determines whether it is normal (S11), and if not normal, repeats the process after the previous step (S10). do. At this time, if the normal operation signal is checked and the data is transmitted (S12), the process after step S10 is repeatedly performed.

Referring to FIG. 3, the operation of the reception unit 200 will be described. As in the operation of the transmission unit 100, the microcomputer 15 initializes the system (S20), and states of RAM and ROM in the microcomputer 15. Check the system (S21). If it is determined that the system is in a normal power supply (S22), and it is determined that the system is not in the normal power supply, the system returns to step S20 to reinitialize the system, and displays a normal state in the normal power supply (S23) and fixes the channel (S24). ). Subsequently, it is determined whether the fixed channel is in use (S25), and if it is not in use, the channel is switched (S26), and then the flow returns to the aforementioned step (S24) to fix the channel again and determine whether the channel is used (S25). Repeat the process. If it is determined in step S25 that the channel is in use, data of the channel is analyzed (S27). Subsequently, if there is an error in the analyzed data, it is determined whether there is an error (S28), and if there is an error, the data is discarded and returned to the above-mentioned step (S27) to perform a process of analyzing the data. Control the output (S29). Then, the method returns to step S27 described above until all data of the corresponding channel is received, and repeats the data analysis process up to step S29.

4 shows a data format according to the present invention for allowing the transmitter 100 and the receiver 200 to perform a data analysis process of steps S27 and S28 with higher accuracy.

The data format includes a synchronization bit unit 40 for synchronizing between a transmission and reception unit, a current channel 45 having information on a channel for exchanging data, and an identification code unit 50 for identifying its own data. ), A mode 55 used for a special purpose between the transmitter and receiver, a state information unit 60 having information about the state of the transmitter, an input data unit 70 composed of actual data, and the presence or absence of an error. It can be divided into the error detection unit 80 to be large.

The identification code unit 50 has a value promised in advance between the transceiver so as to correctly distinguish its own data, the mode 55 is used for a special purpose by the appointment between the transceiver, the transmitter 100 The microcomputer 15 of the receiver 200 performs different program routines according to the mode 55 of the data format to be transmitted by.

For example, if the mode 55 is set to a test mode for checking an error on a transceiver, the receiver 200 displays an error content according to the type of error when an error is detected so that the cause of the error can be found. If the mode 55 is a normal operation mode, an operation such as discarding data in which an error is detected and accepting data again is performed.

In addition, the state information unit 60 is composed of the E / S 61, P / F 62, SLP (63) for the receiver to know the status of the transmitter, the E / S (61) And P / F 62 and SLP 63 are each composed of 2 bits, and are set to '0' in the normal state. However, when an emergency stop occurs, the E / S 61 is set to '1' and '1', and when there is a power failure, the P / F 62 is set to '1' and '1'. If no operation is performed during the time, the SLP 63 is set to '1' and '1'. The receiver 200 can know the state of the transmitter 100 using the above state information.

In addition, the input data unit 70 is composed of the contents of the input data according to the operation of the actual equipment, the error detection unit 80 is a parity bit 81 for checking the odds of the bit string and bits according to a specific pattern The check sum bit 82 checks the sum of the columns.

When performing data communication, the receiver stores the contents of the received data in a buffer and performs a data analysis process for distinguishing whether the data is its own data.

This uses the identification code section 50 in the second and third data formats STX [1], STX [2] of FIG.

The first data format (STX [0]) consists of the first sync bit of '0', '0', '1', '0' and the current channel 45. Compare and match the signal with the first sync bit (STX [0] of the data format) of your own data format, and assume the next received signal as the second data, and the sync bit of the second data format (STX [1]). Compare with If they also match, synchronization is achieved by comparing the third data format (STX [2]) with the next received signal.

In this way, if all three data formats match, the data is judged as one's own data, and subsequent data are continuously accepted.

Of course, since the transceiver knows each other the predetermined data format and the amount of data, periodic synchronization can be obtained.

When all data of one frame is received, the first data of the next frame is continued, so the signal is analyzed in the same way as the first synchronization.

In addition, the data format includes a checksum bit 82 together with a horizontal parity bit 81 to detect an error, so that an error can be detected even when an error of not only one bit but also multiple bits occur at the same time.

In this way, the first 3 bytes (STX [0] to STX [2]) and the last 3 bytes (STX [9] to STX [11]) of all the data are used to determine whether the data is owned, synchronized and errored. If an error occurs, it ignores the data and displays an error message at the same time. If it is determined that no error has occurred, a drive signal for moving the equipment is sent to the output port based on this data.

As described above, according to the data communication format and the control method for the wireless remote control according to the present invention, by using the data format and data format including the sync bit unit, the identification code unit, the error detection unit, By providing a data control method that synchronizes between transceivers and detects the presence of an error, it is possible to secure the safety of the system through reliable communication between the transceivers in wireless remote control, thereby preventing safety accidents. There is.

In addition, improved reliability of asynchronous serial communication enables a network between the electronic controller and the controller to configure a remote control system between multiple controllers.

Claims (8)

A data communication format for radio remote control, comprising: a synchronization bit unit for synchronizing a transmitter and a receiver, an identification code unit for discriminating its own data, a mode used for a special purpose between the transmitter and the receiver, and a transmitter Data for wireless remote control, characterized in that it comprises a status information unit used to inform the receiver of the state, an input data unit having the contents of the actual data according to the operation of the equipment, and an error detection unit for detecting the presence or absence of an error Communication format. The data communication format of claim 1, wherein the sync bit unit comprises sync bits located at higher bits of the data format. The data communication format of claim 1, wherein the identification code unit comprises an identification code having a predetermined value between transceivers so as to accurately distinguish its own data. The data communication format of claim 1, wherein the error detection unit comprises a parity bit for checking the sum of the sum of the bit strings and a check sum bit for checking the sum of the bit strings according to a specific pattern. A method of controlling a data format for wireless remote control, comprising: a first process of synchronizing a received signal with the data format, a second process of distinguishing whether the received data is its own data, and And a third step of determining whether there is an error. The method of claim 5, wherein the first process compares the synchronization bit unit of the data format and the received data to third data. The method of claim 5, wherein the second process comprises using an identification code unit of the data format. 6. The method of claim 5, wherein the third process uses an error detector in the last 3 bytes of data.