KR20200076063A - Apparatus and method of detecting error of serial communication lines - Google Patents

Abstract

The present invention relates to an apparatus for detecting an abnormality in serial communication lines and a method thereof. More particularly, the present invention relates to a technology comprising: a first communication line check circuit which receives at least one of a low value or a high value reflecting the connection state of a communication line from a relay circuit connected to external data terminal equipment (DTE) through the communication line; a second communication line check circuit which receives at least one of a low value or a high value reflecting the connection state of the communication line from the relay circuit; and a microcontroller which compares whether data is received between a plurality of data ports and the first communication line check circuit or the second communication line check circuit to determine a communication line that does not operate normally among the communication lines.

Description

Device and method for detecting abnormality of serial communication line{APPARATUS AND METHOD OF DETECTING ERROR OF SERIAL COMMUNICATION LINES}

The present invention relates to a technical idea of supporting a smooth communication by detecting an abnormality in a communication line through which data is transmitted in multi-drop communication, and more specifically, does not operate normally through a circuit for determining whether or not there is an abnormality in the communication line. It relates to a technology for selecting a communication line and supporting smooth communication between an internal data terminal equipment (DTE) and an external data terminal equipment (DTE).

Generally, a method for an internal communication device to exchange information with the outside through an external communication device can be divided into two types: parallel communication and serial communication.

A parallel communication method that can process a lot of information at a time by using a high-speed communication speed is mainly used, because it is possible to improve communication performance by processing a large amount of information at once.

However, parallel communication is not preferred due to the limitation of communication distance, technical difficulties in implementation, and high cost, and when performing communication that does not require a high-speed communication speed, a serial communication method has been widely used.

RS485 exists as a representative of serial communication, and RS485 is one of the representative protocols of multi-drop communication supporting transmission between up to 256 multipoints.

In the conventional RS485, a control device for controlling a transmission unit is implemented in each of a master board and a slave board, and it has been proposed to check whether a corresponding board can be transmitted from a control device of each board.

However, the circuit used for the conventional RS485 communication does not include a circuit configuration for determining the presence or absence of an abnormality in a communication line transmitting data.

That is, in the conventional RS485, when data is transmitted between DTEs (Data Terminal Equipments) that perform communication, it is not possible to check whether the transmitted data is normally transmitted, and even when receiving, a short circuit or a line break between RS485 communication lines or an external DTE IC (Integrated) The disadvantage of not being able to recognize defects of the chip).

Accordingly, there is a need to develop a technique for discovering an abnormality in a communication line through which data is transmitted in a multi-drop communication based on serial communication and processing the found abnormality portion.

Japanese Patent No. 602649, "Device management system using LAN communication" Korean Registered Patent No. 10-0676857, "Communication device using RS485 protocol" Korean Registered Patent No. 10-0689823, "RS-485 communication control device" Korean Registered Patent No. 10-1539579, "RS232C serial communication hardware error detection processing device and method"

The present invention detects a communication line that does not normally operate among communication lines through which data is transmitted in RS485 communication, which is multi-drop communication, and supports smooth communication between an internal data terminal equipment (DTE) and an external data terminal equipment (DTE). You can do it for the purpose.

The present invention controls a relay circuit that blocks or connects a bus (BUS) communication line connecting an internal data terminal equipment (DTE) and an external data terminal equipment (DTE) to facilitate smooth communication between external data terminal equipment (DTE). You can aim to apply.

In the present invention, when an abnormality is detected by an external data terminal equipment (DTE), the relay circuit is controlled to maintain a connection with an external data terminal equipment (DTE), and upon normal operation of the external data terminal equipment (DTE), It can be aimed at controlling to enable immediate communication.

The present invention may be intended to check the presence or absence of at least one of transmission or reception of data in RS485 communication, which is multi-drop communication.

According to an embodiment of the present invention, a device for detecting an abnormality in a serial communication line is provided from a microcontroller including a reception port, a transmission port, and a plurality of data ports, from external DTE (Data Terminal Equipment) and relay circuits connected through a communication line. A first communication line confirmation circuit for receiving at least one of a low value or a high value reflecting the connection state of the communication line, and a second communication line for receiving at least one of a low or high value reflecting the connection state of the communication line from the relay circuit Including a confirmation circuit, the microcontroller compares whether data is received between the plurality of data ports and the first communication line confirmation circuit or the second communication line confirmation circuit, and determines a communication line that does not normally operate among the communication lines. Can.

When the high value is received from the first communication line confirmation circuit and the low value is received from the second communication line confirmation circuit, the microcontroller may connect a communication line connected to the second communication line verification circuit through the relay circuit among the communication lines. It may be determined that the communication line does not operate normally.

When the low value is received from the first communication line confirmation circuit and the high value is received from the second communication line confirmation circuit, the microcontroller may connect a communication line connected to the first communication line verification circuit through the relay circuit among the communication lines. It may be determined that the communication line does not operate normally.

The microcontroller receives data through any one of the plurality of data ports when a high value is received from the first communication line confirmation circuit, and when a high value is received from the second communication line confirmation circuit, the plurality of Data can be received through any of the data ports.

The microcontroller may receive data through the reception port when a high value is received from the first communication line verification circuit and the second communication line verification circuit.

When the high value is received from the first communication line confirmation circuit and the low value is received from the second communication line confirmation circuit, the microcontroller is configured to communicate with the second communication line confirmation circuit through the relay circuit among the communication lines. The relay circuit can be controlled to cut off the connection.

When the low value is received from the first communication line verification circuit and the high value is received from the second communication line verification circuit, the microcontroller is configured to communicate with the first communication line verification circuit through the relay circuit among the communication lines. The relay circuit can be controlled to cut off the connection.

The microcontroller may control the relay circuit to maintain the connection of the communication line when detecting an abnormal communication with the external data terminal equipment (DTE).

The microcontroller determines one of a transmission mode or a reception mode by outputting either a low value or a high value through one of the plurality of data ports, and outputs data through the transmission port in the transmission mode. Can.

The transmission port may further include a transmission confirmation circuit that transmits data output through the transmission port to the reception port, the first communication line confirmation circuit, and the second communication line confirmation circuit.

The microcontroller may determine whether to transmit data output through the transmission port by comparing whether or not data is received between the plurality of data ports and the first communication line confirmation circuit or the second communication line confirmation circuit.

According to an embodiment of the present invention, a method for detecting an abnormality in a serial communication line is a first communication line confirmation circuit, a low value reflecting the connection state of the communication line from an external DTE (Data Terminal Equipment) and a relay circuit connected through the communication line, or Receiving at least one of the high value, the second communication line check circuit, receiving at least one of a low value or a high value reflecting the connection state of the communication line from the relay circuit, and in the microcontroller, a plurality of data ports And comparing data received between the first communication line verification circuit or the second communication line verification circuit, and determining a communication line that does not normally operate among the communication lines.

The determining of a communication line that does not normally operate among the communication lines may include, when a high value is received from the first communication line confirmation circuit and a low value is received from the second communication line confirmation circuit, through the relay circuit among the communication lines. Determining a communication line connected to a second communication line verification circuit as the communication line that does not operate normally, and when a low value is received from the first communication line verification circuit and a high value is received from the second communication line verification circuit, the communication line Among the steps, it may include determining a communication line connected to the first communication line confirmation circuit through the relay circuit as the communication line that does not operate normally.

According to an embodiment of the present invention, a method for detecting an abnormality in a serial communication line receives data through any one of the plurality of data ports when a high value is received from the first communication line confirmation circuit in the microcontroller. Step In the microcontroller, when a high value is received from the second communication line verification circuit, receiving data through any one of the plurality of data ports, and the microcontroller is the first communication line verification circuit and the first 2, when a high value is received from the communication line confirmation circuit, the method may further include receiving data through the reception port.

The present invention detects a communication line that does not normally operate among communication lines for transmitting data in RS485 communication, which is multi-drop communication, and can support smooth communication between an internal DTE (Data Terminal Equipment) and an external DTE (Data Terminal Equipment). have.

The present invention controls a relay circuit that blocks or connects a bus (BUS) communication line connecting an internal data terminal equipment (DTE) and an external data terminal equipment (DTE) to facilitate smooth communication between external data terminal equipment (DTE). I can apply.

In the present invention, when an abnormality is detected by an external data terminal equipment (DTE), the relay circuit is controlled to maintain a connection with an external data terminal equipment (DTE), and upon normal operation of the external data terminal equipment (DTE), It can be controlled to enable immediate communication.

The present invention can check whether there is an abnormality in at least one of transmission or reception of data in RS485 communication, which is multi-drop communication.

1 is a view for explaining a block diagram of an apparatus for detecting an abnormality in a serial communication line according to an embodiment of the present invention.
2 is a diagram illustrating a circuit diagram of an apparatus for detecting an abnormality in a serial communication line according to an embodiment of the present invention.
3 and 4 are diagrams illustrating a flowchart related to a method of detecting an abnormality in a serial communication line according to an embodiment of the present invention.

Specific structural or functional descriptions of the embodiments according to the concept of the present invention disclosed in this specification are exemplified only for the purpose of explaining the embodiments according to the concept of the present invention, and the embodiments according to the concept of the present invention These can be implemented in various forms and are not limited to the embodiments described herein.

Embodiments according to the concept of the present invention can be applied to various changes and can have various forms, so the embodiments will be illustrated in the drawings and described in detail herein. However, this is not intended to limit the embodiments according to the concept of the present invention to specific disclosure forms, and includes changes, equivalents, or substitutes included in the spirit and scope of the present invention.

Terms such as first or second may be used to describe various components, but the components should not be limited by the terms. The above terms are only for the purpose of distinguishing one component from other components, for example, without departing from the scope of rights according to the concept of the present invention, the first component may be referred to as the second component, Similarly, the second component may also be referred to as the first component.

When an element is said to be "connected" or "connected" to another component, it is understood that other components may be directly connected or connected to the other component, but other components may exist in the middle. It should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that no other component exists in the middle. Expressions describing the relationship between the components, for example, "between" and "immediately between" or "directly neighboring to" should also be interpreted.

The terminology used herein is only used to describe specific embodiments and is not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, the terms "include" or "have" are intended to designate the presence of a feature, number, step, action, component, part, or combination thereof as described, one or more other features or numbers, It should be understood that the presence or addition possibilities of steps, actions, components, parts or combinations thereof are not excluded in advance.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains. Terms such as those defined in a commonly used dictionary should be interpreted as having meanings consistent with meanings in the context of related technologies, and should not be interpreted as ideal or excessively formal meanings unless explicitly defined herein. Does not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, the scope of the patent application is not limited or limited by these embodiments. The same reference numerals in each drawing denote the same members.

1 is a view for explaining a block diagram of an apparatus for detecting an abnormality in a serial communication line according to an embodiment of the present invention.

Specifically, FIG. 1 illustrates a component of an apparatus for detecting an abnormality in a serial communication line according to an embodiment of the present invention.

Referring to FIG. 1, an apparatus 100 for detecting an abnormality in a serial communication line according to an embodiment of the present invention includes a first communication line verification circuit 110, a second communication line verification circuit 120, and a micro controller It may include (130).

For example, the device 100 for detecting an abnormality of the serial communication line may be interpreted as an internal data terminal equipment (DTE), a component of the internal DTE, or an entity using some components of the internal DTE.

According to an embodiment of the present invention, the first communication line identification circuit 110 is at least one of a low value or a high value reflecting the connection state of the communication line from an external DTE (Data Terminal Equipment) and a relay circuit connected through the communication line. Can receive.

For example, the relay circuit is located between the external DTE and the first communication line identification circuit 110 and can be controlled to block or maintain the connection of the communication line between the external DTE and the first communication line verification circuit, and the serial communication line It may be included in the device 100 for detecting an abnormality.

For example, the first communication line confirmation circuit 110 includes at least one of a filter, an inverter, or a comparator, and receives a value reflecting a connection state of a communication line as a low value or a high value based on at least one of the filter, inverter, or comparator can do.

For example, a high value may include "H", "1", "positive", and data above a threshold, and a low value may include "L", "0", "negative", and sub-threshold data. It can contain.

According to an embodiment of the present invention, the first communication line confirmation circuit 110 may be controlled to check a data transmission state for at least one of reception or transmission of data through the first communication line among communication lines connected through a relay circuit. .

For example, when receiving the high value of the low value or the high value reflecting the connection state of the communication line from the relay circuit, the first communication line confirmation circuit 110 may transmit data to one of a plurality of data ports.

In addition, when receiving the low value of the low value or the high value reflecting the connection state of the communication line from the relay circuit, the first communication line confirmation circuit 110 cannot transmit data to any one of the plurality of data ports.

According to an embodiment of the present invention, the second communication line confirmation circuit 120 is at least one of a low value or a high value reflecting the connection state of the communication line from an external DTE (Data Terminal Equipment) and a relay circuit connected through the communication line. Can receive.

For example, the relay circuit may be positioned between the external DTE and the second communication line verification circuit 120 to block or maintain the connection of the communication line between the external DTE and the second communication line verification circuit.

In one example, the second communication line checking circuit 120 includes at least one of a filter, an inverter, or a comparator, and receives a value reflecting the connection state of the communication line as a low value or a high value based on at least one of the filter, inverter, or comparator can do.

According to an embodiment of the present invention, the second communication line confirmation circuit 120 may be controlled to check a data transmission state for at least one of reception or transmission of data through the second communication line among communication lines connected through a relay circuit. .

For example, the second communication line confirmation circuit 120 may transmit data to any one of a plurality of data ports when receiving a high value among low or high values reflecting the connection state of the communication line from the relay circuit.

In addition, when receiving the low value of the low value or the high value reflecting the connection state of the communication line from the relay circuit, the second communication line confirmation circuit 120 cannot transmit data to any one of the plurality of data ports.

According to an embodiment of the present invention, the microcontroller 130 includes a reception port, a transmission port, and a plurality of data ports, and any one of the plurality of data ports is connected to the first communication line confirmation circuit 110, and any one Is connected to the second communication line confirmation circuit 120, one of which can output a signal to control the transmission and reception mode.

For example, among a plurality of data ports, a first communication line confirmation circuit 110 of a first data port is connected, a second data port is connected to a second communication line confirmation circuit 110, and a third data port is a transmission/reception mode. It can output a signal to control the.

According to an embodiment of the present invention, the microcontroller 130 compares whether data is received between the plurality of data ports and the first communication line confirmation circuit 110 or the second communication line confirmation circuit 120, and does not operate normally among the communication lines. The communication line can be judged.

For example, the microcontroller 130 checks the second communication line through the relay circuit among the communication lines when a high value is received from the first communication line verification circuit 110 and a low value is received from the second communication line verification circuit 120. The communication line connected to the circuit 120 may be determined as a communication line that does not operate normally.

According to an embodiment of the present invention, when a high value is received from the first communication line confirmation circuit 110, the microcontroller 130 receives data through any one of a plurality of data ports, and the second communication line confirmation circuit When a high value is received at 120, data may be received through any one of a plurality of data ports.

In addition, when a low value is received from the first communication line confirmation circuit 110, the microcontroller 130 does not receive data through any one of a plurality of data ports, and the low value is obtained from the second communication line confirmation circuit 120. When this is received, data may not be received through any one of a plurality of data ports.

Accordingly, the present invention detects a communication line that does not normally operate among communication lines through which data is transmitted in RS485 communication, which is multi-drop communication, and provides smooth communication between an internal data terminal equipment (DTE) and an external data terminal equipment (DTE). I can apply.

According to an embodiment of the present invention, when a high value is received from the first communication line verification circuit 110 and the second communication line verification circuit 120, the microcontroller 130 may receive data through the reception port.

Further, the microcontroller 130 cannot receive data through the reception port when a low value is received from either the first communication line verification circuit 110 or the second communication line verification circuit 120.

According to an embodiment of the present invention, the microcontroller 130 is a relay circuit among communication lines when a high value is received from the first communication line confirmation circuit 110 and a low value is received from the second communication line confirmation circuit 120. Through it, the relay circuit can be controlled to cut off the connection of the communication line connected to the second communication line confirmation circuit 120.

For example, when the low value is received from the first communication line check circuit 110 and the high value is received from the second communication line check circuit 120, the microcontroller 130 checks the first communication line through the relay circuit among the communication lines. The relay circuit may be controlled to cut off the connection of the communication line connected to the circuit 110.

Therefore, the present invention controls the relay circuit that blocks or connects a bus (BUS) communication line connecting an internal DTE (Data Terminal Equipment) and an external DTE (Data Terminal Equipment), thereby seamlessly connecting external DTE (Data Terminal Equipment). Can support communication.

According to an embodiment of the present invention, the microcontroller 130 may control the relay circuit to maintain the connection of the communication line when detecting an abnormal communication with the external data terminal equipment (DTE).

For example, in the reception mode for receiving data from an external DTE, the microcontroller 130 may detect an abnormal communication with the external DTE when data is not received from the external DTE.

According to an embodiment of the present invention, the microcontroller 130 outputs either a low value or a high value through any one of a plurality of data ports to determine either a transmission mode or a reception mode, and transmits in the transmission mode Data can be output through the port.

That is, the microcontroller 130 may maintain a reception mode when outputting a low value through any one of a plurality of data ports, and may switch to a transmission mode when outputting a high value.

According to another embodiment of the present invention, an apparatus for detecting an abnormality in a serial communication line may further include a transmission confirmation circuit.

For example, the microcontroller 130 may control the transmission confirmation circuit to transmit data output through the transmission port to the reception port, the first communication line confirmation circuit, and the second communication line confirmation circuit.

According to an embodiment of the present invention, the microcontroller 130 compares whether data is received between a plurality of data ports and a first communication line confirmation circuit or a second communication line confirmation circuit, and transmits data output through the transmission port. Can judge.

In one example, the microcontroller 130 controls the transmission mode and the reception mode, but detects a communication line abnormality for transmission and reception of data based on whether data is received from the first data port and the second data port among the plurality of data ports. can do.

2 is a diagram illustrating a circuit diagram of an apparatus for detecting an abnormality in a serial communication line according to an embodiment of the present invention.

Specifically, FIG. 2 illustrates a circuit connection configuration between a component of a device for detecting an abnormality in a serial communication line and an external DTE for a device for detecting an abnormality in a serial communication line according to an embodiment of the present invention.

Referring to FIG. 2, an apparatus 200 for detecting an abnormality in a serial communication line according to an embodiment of the present invention includes a first communication line verification circuit 210, a second communication line verification circuit 220, and a data transmission/reception circuit 230 , Including a microcontroller 240, a relay circuit 250, a transmission confirmation circuit 260, a power supply circuit 270, and an external DTE 280, an external DTE 281, and an external DTE 282. It can be connected via the RS485 bus line. Here, the RS485 bus line may represent a communication line.

The apparatus 200 for detecting an abnormality in a serial communication line according to an embodiment of the present invention may be controlled by the microcontroller 240.

The microcontroller 240 includes a reception port (RXD), a transmission port (TX), a data port (A), a data port (B) and a data port (C).

According to an embodiment of the present invention, the microcontroller 240 may set a device 200 for detecting an abnormality in a serial communication line in a data reception mode by outputting a low value through the data port C.

For example, the device 200 that detects an abnormality in the serial communication line may maintain a data reception mode when data is not transmitted.

In addition, the microcontroller 240 applies a bias voltage through the resistor R1 and the resistor R2 of the circuit 231 connected to the data transmission/reception circuit 230, and the first communication line verification circuit 210, 2 can be controlled to maintain the operation state of the communication line confirmation circuit 220 and the transmission confirmation circuit 260.

For example, when the microcontroller 240 outputs a low value through the data port C, the low value is inverted to a high value through the inverter IC3 of the transmission confirmation circuit 260 and the transmission confirmation circuit 260 A high value is input to port 2 of the circuit IC2.

At this time, since low values are input to ports 3 and 4 of the circuit IC2, ports 6 and 7, which are output ports of the circuit IC2, may maintain a high impedance state.

Also, port 1 corresponding to the data receiving port of the circuit IC2 may be maintained in a high impedance state.

Therefore, the microcontroller 240 may control the transmission confirmation circuit 260 not to operate in the data reception mode.

According to an embodiment of the present invention, the data port A and the data port B of the microcontroller 240 may be maintained in a normal input state.

In one example, the microcontroller 240 may use a resistor R5 and a resistor R6 of the circuit 261 to add a resistor to minimize the impedance effect on the communication line 251 and the communication line 252.

According to an embodiment of the present invention, the first communication line identification circuit 210 may include an inverter 211, a filter 212, a comparator 213, a data input circuit 214, and a reference voltage input circuit 215. have.

Port 3 of the comparator 213, the bias voltage of the resistor (R1) of the circuit 231 flows through the diode (D2) of the reference voltage input circuit 215 after the voltage is dropped, the capacitor (C2) and the resistance ( R12) may be charged or discharged, and then input to the comparator 213.

At this time, since the voltage drop does not occur in the resistor R11 of the data input circuit 214, a higher voltage is input to the port 2 than the port 3 of the comparator 213, so the port 1 of the comparator 213 has a low value. Can output

Next, a low value is input to the diode D1 of the filter 212, the diode D1 does not operate, and a low value is input to the input port of the inverter 211 through the resistor R9 and the resistor R10. Since it is input, the output port of the inverter 211 can output a high value.

According to an embodiment of the present invention, the second communication line confirmation circuit 220 may include an inverter 221, a filter 222, a comparator 223, a data input circuit 224, and a reference voltage input circuit 225. have.

Port 5 of the comparator 223, after the bias voltage of the resistor R2 of the circuit 231 flows and the voltage drops through the diode D4 of the reference voltage input circuit 225, the capacitor C4 and the resistor ( R16) is charged or discharged, and may be input to port 5 of the comparator 223 afterwards.

At this time, since the voltage drop does not occur in the resistor R15 of the data input circuit 224, a higher voltage is input to the 6th port than the 5th port of the comparator 223, and the 7th port of the comparator 223 is low. You can print the value.

Next, a low value is input to the diode D3 of the inverter 221 and the diode D3 does not operate, and a low value is input to the input port of the inverter 221 through the resistor R13 and the resistor R14. Therefore, the output port of the inverter 221 can output a high value.

In one example, the device 200 for detecting an abnormality in the serial communication line is a diode D2 of the reference voltage input circuit 215 when the communication line 251 receives a high value when receiving data from an external DTE 280 When the capacitor C2 is charged through and the communication line 251 receives a low value, it may be discharged through the capacitor C2.

Here, since the resistor R11 of the data input circuit 214 does not have a charging and discharging circuit, a high value or a low value may be input to the second port of the comparator 213.

The comparator 213 compares the inputs of the 2nd port and the 3rd port, and outputs a high value through the 1st port when the voltage of the 3rd port is high and the 1st port when the voltage of the 2nd port is high. Each low value can be output.

When the high value is output through the port 1 of the comparator 213, when the capacitor (C1) is charged through the diode D1 of the filter 212, the first value of the comparator 213 outputs a low value , The capacitor C1 of the filter 212 may discharge.

Next, when the capacitor C1 is charged to a high value, a low value is input to the data port B of the microcontroller 240, and when the capacitor C1 discharges to a low value, the data of the microcontroller 240 A high value may be input to the port B.

According to an embodiment of the present invention, the first communication line verification circuit 210 may check the communication line 251 and the second communication line verification circuit 220 may check the communication line 252. Here, the operations of the first communication line verification circuit 210 and the second communication line verification circuit 220 may be the same.

For example, a problem occurs in the communication line 251 and the inverter 211 does not operate, so data is not received at the data port B of the microcontroller 240, and only the inverter 221 operates to operate the microcontroller ( When data is received at the data port A of 240, and data is not received at the reception port RXD of the microcontroller 240, the microcontroller 240 recognizes that a problem has occurred in the communication line 251. Can.

In addition, a problem occurs in the communication line 252 and the inverter 221 does not operate, so data is not received at the data port A of the microcontroller 240, and only the inverter 211 operates to operate the microcontroller 240. When data is received at the data port (B) of the data, and data is not received at the reception port (RXD) of the microcontroller 240, the microcontroller 240 may recognize that a problem has occurred with the communication line 252. .

According to an embodiment of the present invention, the microcontroller 240 may output a high value through the data port C to switch the device 200 that detects an abnormality in the serial communication line to a data transmission mode. Here, the data transmission/reception circuit 230 may operate as a transmission circuit.

In one example, the microcontroller 240 transmits data through the transmission port TXD, and when the microcontroller 240 outputs a high value through the data port C, the data transmission/reception circuit 230 transmits data State.

When the data transmission/reception circuit 230 is switched to the data transmission state, the transmission confirmation circuit 260 inputs a low value to port 2 of the inverted signal roll circuit IC2 through the inverter IC3, and the circuit IC2 ) May be switched to the data reception mode.

In addition, the microcontroller 240 determines whether the data transmitted from the circuit IC1 of the data transmission/reception circuit 230 is received through the port 1 of the circuit IC2 and the normal or abnormal state of the data transmitted to the circuit IC1. I can judge.

When data is transmitted, the first communication line verification circuit 210 and the second communication line verification circuit 220 may operate in the same manner as when receiving data from the external DTE 280.

Accordingly, the microcontroller 240 checks each of the communication line 251 and the communication line 252 to determine whether data is received at the reception port RXD, the data port A, and the data port B of the microcontroller 240. By comparing, it may be determined whether the data has been normally transmitted.

That is, the present invention can confirm whether there is an abnormality in at least one of transmission or reception of data in RS485 communication, which is multi-drop communication.

For example, the communication line 251 may include an RS485- communication line, and the communication line 252 may include an RS485+ communication line.

According to an embodiment of the present invention, when a problem occurs in the communication line 251 or the communication line 252, the microcontroller 240 controls the relay circuit 250 to control the relay circuit 250 to generate an external DTE 280. , The receiving port of the microcontroller 240 operates in the same manner as when the data is transmitted from the device 200 that detects an abnormality in the serial communication line by blocking the connection with the external DTE 281 or the external DTE 282 (RXD), when the transmission signal is normally input from the data port (A) and the data port (B), the relay circuit 250 is controlled to maintain at least one connection between the communication line 251 and the communication line 252 connected to the outside. Can.

In addition, the device 200 for detecting an abnormality in the serial communication line is the communication line 251 or the communication line until the communication state of the external DTE 280, the external DTE 281, or the external DTE 282 returns to normal. At least one connection of 252 may be maintained.

For example, if the transmission signal is not normally input from the reception port (RXD), data port (A), and data port (B) of the microcontroller 240, the microcontroller 240 controls the relay circuit 250 The external DTE 280, external DTE 281, and external DTE 281 and external DTE 280 are blocked by blocking the communication line 251 or communication line 252 connected to the external DTE 280, external DTE 281, or external DTE 282. The relay circuit 250 may be controlled so that communication between the DTEs 282 can be performed.

In one example, the power circuit 270 is a comparator 213, a comparator 223, a capacitor C2, a capacitor C4, a resistor R12, a resistor 16 is an external DTE 280, an external DTE ( 281) and the external DTE (282) is far from the distance, or external DTE (280), external DTE (281) and external DTE (282), such as a large number of external DTE, communication line 251 or communication line ( A -VCC voltage may be supplied to 252 to prevent a potential difference between the device 200 for detecting an abnormality of the serial communication line and the external DTE 280, the external DTE 281, and the external DTE 282.

3 is a view for explaining a flowchart related to a method for detecting an abnormality in a serial communication line according to an embodiment of the present invention.

Specifically, FIG. 3 illustrates a procedure for determining a communication line in which a method for detecting an abnormality in a serial communication line according to an embodiment of the present invention does not operate normally.

Referring to FIG. 3, in step 301, a method of detecting an abnormality in a serial communication line receives a value reflecting a connection state of the communication line in the first communication line confirmation circuit.

That is, the method for detecting an abnormality in the serial communication line receives at least one of a low value or a high value reflecting the connection state of the communication line from an external DTE (Data Terminal Equipment) and a relay circuit connected through the communication line in the first communication line confirmation circuit. can do.

For example, a method of detecting an abnormality in a serial communication line receives a low value from the first communication line confirmation circuit when the communication line connected through an external DTE (Data Terminal Equipment) and a relay circuit does not operate normally, and receives an external DTE. When the (Data Terminal Equipment) and the communication line are operating normally, a high value may be received from the first communication line confirmation circuit.

In step 302, the method for detecting an abnormality in the serial communication line may receive a value reflecting the connection state of the communication line in the second communication line confirmation circuit.

That is, the method for detecting an abnormality in the serial communication line receives at least one of a low value or a high value reflecting the connection state of the communication line from an external DTE (Data Terminal Equipment) and a relay circuit connected through the communication line in the second communication line confirmation circuit. can do.

For example, a method for detecting an abnormality in a serial communication line receives a low value from the second communication line confirmation circuit when the communication line connected through an external data terminal equipment (DTE) and a relay circuit does not operate normally, and receives an external DTE. When the (Data Terminal Equipment) and the communication line operate normally, a high value may be received from the second communication line confirmation circuit.

In step 303, the method of detecting an abnormality in the serial communication line determines whether data is received from a data port connected to the first communication line confirmation circuit.

That is, when a method for detecting an abnormality in the serial communication line receives a high value from the first communication line verification circuit, it proceeds to step 304 by receiving data from a data port connected to the first communication line verification circuit, and confirms the first communication line If the circuit receives a low value, it may proceed to step 305 because it cannot receive data from the data port connected to the first communication line confirmation circuit.

In step 304, the method of detecting an abnormality in the serial communication line determines whether data is received from a data port connected to the second communication line verification circuit.

That is, the method for detecting an abnormality in the serial communication line, when receiving a high value from the second communication line verification circuit, receives data from a data port connected to the second communication line verification circuit, terminates the corresponding procedure, and the second communication line verification circuit If a high value is received, it is possible to proceed to step 306 because data is not received from the data port connected to the second communication line confirmation circuit.

In step 305, a method of detecting an abnormality in the serial communication line may determine that the communication line connected to the first communication line verification circuit is a communication line that does not operate normally.

That is, in the case of detecting an abnormality in the serial communication line, when a low value is received from the first communication line verification circuit, data cannot be received from a data port connected to the first communication line verification circuit, and the communication line connected to the first communication line verification circuit is normal. It can be judged as an inoperative communication line.

In step 306, the method of detecting an abnormality in the serial communication line may determine that the communication line connected to the second communication line verification circuit is a communication line that does not operate normally.

That is, in the case of detecting an abnormality in the serial communication line, when a low value is received from the second communication line verification circuit, data cannot be received from the data port connected to the second communication line verification circuit, and the communication line connected to the second communication line verification circuit is normal. It can be judged as an inoperative communication line.

In addition, a method for detecting an abnormality in a serial communication line according to an embodiment of the present invention includes receiving a microcontroller when receiving data through a data port connected to a first communication line confirmation circuit and a data port connected to a second communication line confirmation circuit. Data can be normally received through the port.

4 is a view for explaining a flowchart related to a method for detecting an abnormality in a serial communication line according to an embodiment of the present invention.

Specifically, FIG. 4 illustrates a procedure for controlling a method for detecting an abnormality in a serial communication line according to an embodiment of the present invention to block a communication line that does not operate normally.

Referring to FIG. 4, in step 401, a method of detecting an abnormality in a serial communication line receives a value reflecting a connection state of the communication line in the first communication line confirmation circuit.

That is, the method for detecting an abnormality in the serial communication line receives at least one of a low value or a high value reflecting the connection state of the communication line from an external DTE (Data Terminal Equipment) and a relay circuit connected through the communication line in the first communication line confirmation circuit. can do.

In step 402, the method for detecting an abnormality in the serial communication line may receive a value reflecting the connection state of the communication line in the second communication line confirmation circuit.

That is, the method for detecting an abnormality in the serial communication line receives at least one of a low value or a high value reflecting the connection state of the communication line from an external DTE (Data Terminal Equipment) and a relay circuit connected through the communication line in the second communication line confirmation circuit. can do.

In step 403, the method of detecting an abnormality in the serial communication line determines whether data is received from a data port connected to the first communication line confirmation circuit.

That is, in the case of detecting an abnormality in the serial communication line, when a high value is received from the first communication line verification circuit, data is received from a data port connected to the first communication line verification circuit to proceed to step 404, and the first communication line is confirmed. When the circuit receives the low value, it may proceed to step 405 because it cannot receive data from the data port connected to the first communication line confirmation circuit.

In step 404, the method for detecting an abnormality in the serial communication line determines whether data is received from the data port connected to the second communication line verification circuit.

That is, the method for detecting an abnormality in the serial communication line, when receiving a high value from the second communication line verification circuit, receives data from a data port connected to the second communication line verification circuit, terminates the corresponding procedure, and the second communication line verification circuit If a high value is received, it is possible to proceed to step 406 because data is not received from the data port connected to the second communication line confirmation circuit.

In step 405, the method of detecting an abnormality in the serial communication line may be controlled to cut off the communication line connected to the first communication line confirmation circuit.

That is, in the case of detecting an abnormality in the serial communication line, when a low value is received from the first communication line verification circuit, data from a data port connected to the first communication line verification circuit is not received, thereby blocking the communication line connected to the first communication line verification circuit. The relay circuit can be controlled to support smooth communication between external DTEs.

The method of detecting an abnormality in the serial communication line in step 406 may be controlled to cut off the communication line connected to the second communication line confirmation circuit.

That is, in the method of detecting an abnormality in the serial communication line, when a low value is received from the second communication line verification circuit, data from a data port connected to the second communication line verification circuit is not received, thereby blocking the communication line connected to the second communication line verification circuit. The relay circuit can be controlled to support smooth communication between external DTEs.

In addition, the method for detecting an abnormality in the serial communication line according to an embodiment of the present invention, when receiving data through the data port connected to the first communication line check circuit and the data port connected to the second communication line check circuit, check the first communication line The relay circuit may be controlled to maintain a connection state between the circuit and the communication line connected to the second communication line confirmation circuit.

The device described above may be implemented with hardware components, software components, and/or combinations of hardware components and software components. For example, the devices and components described in the embodiments include, for example, processors, controllers, arithmetic logic units (ALUs), digital signal processors (micro signal processors), microcomputers, field programmable arrays (FPAs), It may be implemented using one or more general purpose computers or special purpose computers, such as a programmable logic unit (PLU), microprocessor, or any other device capable of executing and responding to instructions. The processing device may run an operating system (OS) and one or more software applications running on the operating system. Further, the processing device may access, store, manipulate, process, and generate data in response to the execution of the software. For convenience of understanding, a processing device may be described as one being used, but a person having ordinary skill in the art, the processing device may include a plurality of processing elements and/or a plurality of types of processing elements. It can be seen that may include. For example, the processing device may include a plurality of processors or a processor and a controller. In addition, other processing configurations, such as parallel processors, are possible.

The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, or the like alone or in combination. The program instructions recorded on the medium may be specially designed and configured for the embodiments or may be known and usable by those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs, DVDs, and magnetic media such as floptical disks. Includes hardware devices specifically configured to store and execute program instructions such as magneto-optical media, and ROM, RAM, flash memory, and the like. Examples of program instructions include high-level language code that can be executed by a computer using an interpreter, etc., as well as machine language codes produced by a compiler. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

The software may include a computer program, code, instruction, or a combination of one or more of these, and configure the processing device to operate as desired, or process independently or collectively You can command the device. Software and/or data may be interpreted by a processing device, or to provide instructions or data to a processing device, of any type of machine, component, physical device, virtual equipment, computer storage medium or device. , Or may be permanently or temporarily embodied in the transmitted signal wave. The software may be distributed on networked computer systems and stored or executed in a distributed manner. Software and data may be stored in one or more computer-readable recording media.

Although the embodiments have been described by the limited drawings as described above, a person skilled in the art can make various modifications and variations from the above description. For example, the described techniques are performed in a different order than the described method, and/or the components of the described system, structure, device, circuit, etc. are combined or combined in a different form from the described method, or other components Alternatively, proper results can be achieved even if replaced or substituted by equivalents.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

100: a device for detecting an error in the serial communication line
110: first communication line confirmation circuit 120: second communication line confirmation circuit
130: microcontroller

Claims (13)

A microcontroller including a reception port, a transmission port, and a plurality of data ports;
A first communication line confirmation circuit for receiving at least one of a low value or a high value reflecting the connection state of the communication line from a relay circuit connected through an communication line with an external data terminal equipment (DTE); And
A second communication line confirmation circuit that receives at least one of a low value or a high value reflecting the connection state of the communication line from the relay circuit
Including,
The microcontroller,
Comparing whether or not data is received between the plurality of data ports and the first communication line confirmation circuit or the second communication line confirmation circuit to determine a communication line that does not normally operate among the communication lines
A device that detects an error in the serial communication line. According to claim 1,
When the high value is received from the first communication line confirmation circuit and the low value is received from the second communication line confirmation circuit, the microcontroller may connect a communication line connected to the second communication line verification circuit through the relay circuit among the communication lines. Judging by the communication line that does not work normally
A device that detects an error in the serial communication line. According to claim 1,
When the low value is received from the first communication line confirmation circuit and the high value is received from the second communication line confirmation circuit, the microcontroller may connect a communication line connected to the first communication line verification circuit through the relay circuit among the communication lines. Judging by the communication line that does not work normally
A device that detects an error in the serial communication line. According to claim 1,
The microcontroller receives data through any one of the plurality of data ports when a high value is received from the first communication line confirmation circuit, and when a high value is received from the second communication line confirmation circuit, the plurality of To receive data through any of the data ports
A device that detects an error in the serial communication line. According to claim 2,
The microcontroller receives data through the reception port when a high value is received from the first communication line verification circuit and the second communication line verification circuit.
A device that detects an error in the serial communication line. According to claim 1,
When the high value is received from the first communication line confirmation circuit and the low value is received from the second communication line confirmation circuit, the microcontroller is configured to communicate with the second communication line confirmation circuit through the relay circuit among the communication lines. To control the relay circuit to disconnect the connection
A device that detects an error in the serial communication line. According to claim 1,
When the low value is received from the first communication line verification circuit and the high value is received from the second communication line verification circuit, the microcontroller is configured to communicate with the first communication line verification circuit through the relay circuit among the communication lines. To control the relay circuit to disconnect the connection
A device that detects an error in the serial communication line. According to claim 1,
The microcontroller controls the relay circuit to maintain the connection of the communication line when detecting an abnormal communication with the external data terminal equipment (DTE)
A device that detects an error in the serial communication line. According to claim 1,
The microcontroller determines either a transmission mode or a reception mode by outputting either a low value or a high value through any one of the plurality of data ports, and outputs data through the transmission port in the transmission mode. ,
Further comprising a transmission confirmation circuit for transmitting the data output through the transmission port to the reception port, the first communication line confirmation circuit and the second communication line confirmation circuit
A device that detects an error in the serial communication line. The method of claim 9,
The microcontroller,
Comparing whether or not data is received between the plurality of data ports and the first communication line confirmation circuit or the second communication line confirmation circuit to determine whether to transmit data output through the transmission port
A device that detects an error in the serial communication line. In the first communication line confirmation circuit, receiving at least one of a low value or a high value reflecting the connection state of the communication line from an external DTE (Data Terminal Equipment) and a relay circuit connected through the communication line;
In the second communication line confirmation circuit, receiving at least one of a low value or a high value reflecting the connection state of the communication line from the relay circuit; And
Comprising a step of determining whether the data line between the plurality of data ports and the first communication line verification circuit or the second communication line verification circuit is received by the microcontroller, the communication line that does not normally operate among the communication lines.
How to detect an error in the serial communication line. The method of claim 11,
Determining a communication line that does not operate normally among the communication lines,
When a high value is received from the first communication line confirmation circuit and a low value is received from the second communication line confirmation circuit, the communication line connected to the second communication line confirmation circuit through the relay circuit among the communication lines does not operate normally. Determining with a communication line; And
When a low value is received from the first communication line confirmation circuit and a high value is received from the second communication line confirmation circuit, the communication line connected to the first communication line confirmation circuit through the relay circuit among the communication lines does not operate normally. Comprising determining with a communication line
How to detect an error in the serial communication line. The method of claim 12,
Receiving, by the microcontroller, data through any one of the plurality of data ports when a high value is received from the first communication line confirmation circuit;
Receiving, by the microcontroller, data through any one of the plurality of data ports when a high value is received from the second communication line confirmation circuit; And
In the microcontroller, when a high value is received from the first communication line confirmation circuit and the second communication line confirmation circuit, further comprising receiving data through a reception port.
How to detect an error in the serial communication line.

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