Visual Basic Serialport
Looks like I didn't switch the receiver on (or something like that). The problem is that the robot is quite slow and data sent while it's busy is simply lost (or ignored). SerialPort tool comes with a lot of Read functions, but none of them seems to return anything. Briefly, the hardware works, but Visual Basic does not. May 07, 2014 A future series of posts will present the design and implementation of a rational serial port interface built upon, and preserving the style of, the WinAPI serial port functions. It fits seamlessly into the.NET event dispatch model, and multiple coworkers have expressed that it’s exactly how they want a serial-port class to work. Mar 25, 2016 Hello folks, Visual Basic.net is an easy to learn language from Microsoft for the windows platform.One of the cool features of Visual Basic.net is the ability to whip up good looking gui components with a few lines of code. In this tutorial we are going to use Visual Basic.net to program your PC's Serial Port and communicate with an embedded microcontroller like MSP430 or 8051.
-->Visual Studio
Definition
Examples
The following code example demonstrates the use of the SerialPort class to allow two users to chat from two separate computers connected by a null modem cable. In this example, the users are prompted for the port settings and a username before chatting. Both computers must be executing the program to achieve full functionality of this example.
Remarks
Use this class to control a serial port file resource. This class provides synchronous and event-driven I/O, access to pin and break states, and access to serial driver properties. Additionally, the functionality of this class can be wrapped in an internal Stream object, accessible through the BaseStream property, and passed to classes that wrap or use streams.
The SerialPort class supports the following encodings: ASCIIEncoding, UTF8Encoding, UnicodeEncoding, UTF32Encoding, and any encoding defined in mscorlib.dll where the code page is less than 50000 or the code page is 54936. You can use alternate encodings, but you must use the ReadByte or Write method and perform the encoding yourself.
Visual Basic Serial Port Tutorial
You use the GetPortNames method to retrieve the valid ports for the current computer.
If a SerialPort object becomes blocked during a read operation, do not abort the thread. Instead, either close the base stream or dispose of the SerialPort object.
Constructors
| SerialPort()SerialPort()SerialPort()SerialPort() | Initializes a new instance of the SerialPort class. |
| SerialPort(IContainer)SerialPort(IContainer)SerialPort(IContainer)SerialPort(IContainer) | Initializes a new instance of the SerialPort class using the specified IContainer object. |
| SerialPort(String)SerialPort(String)SerialPort(String)SerialPort(String) | Initializes a new instance of the SerialPort class using the specified port name. |
| SerialPort(String, Int32)SerialPort(String, Int32)SerialPort(String, Int32)SerialPort(String, Int32) | Initializes a new instance of the SerialPort class using the specified port name and baud rate. |
| SerialPort(String, Int32, Parity)SerialPort(String, Int32, Parity)SerialPort(String, Int32, Parity)SerialPort(String, Int32, Parity) | Initializes a new instance of the SerialPort class using the specified port name, baud rate, and parity bit. |
| SerialPort(String, Int32, Parity, Int32)SerialPort(String, Int32, Parity, Int32)SerialPort(String, Int32, Parity, Int32)SerialPort(String, Int32, Parity, Int32) | Initializes a new instance of the SerialPort class using the specified port name, baud rate, parity bit, and data bits. |
| SerialPort(String, Int32, Parity, Int32, StopBits)SerialPort(String, Int32, Parity, Int32, StopBits)SerialPort(String, Int32, Parity, Int32, StopBits)SerialPort(String, Int32, Parity, Int32, StopBits) | Initializes a new instance of the SerialPort class using the specified port name, baud rate, parity bit, data bits, and stop bit. |
Fields
| InfiniteTimeoutInfiniteTimeoutInfiniteTimeoutInfiniteTimeout | Indicates that no time-out should occur. |
Properties
| BaseStreamBaseStreamBaseStreamBaseStream | Gets the underlying Stream object for a SerialPort object. |
| BaudRateBaudRateBaudRateBaudRate | Gets or sets the serial baud rate. |
| BreakStateBreakStateBreakStateBreakState | Gets or sets the break signal state. |
| BytesToReadBytesToReadBytesToReadBytesToRead | Gets the number of bytes of data in the receive buffer. It is the most viewed Tamil television channel in the world. The channel telecasts different kind of shows, such as daily soap, game shows, newscasts, and shows of general entertainment, reality shows etc. Youtube tamil serials online. They have another 28 channels. |
| BytesToWriteBytesToWriteBytesToWriteBytesToWrite | Gets the number of bytes of data in the send buffer. |
| CanRaiseEventsCanRaiseEventsCanRaiseEventsCanRaiseEvents | Gets a value indicating whether the component can raise an event. (Inherited from Component) |
| CDHoldingCDHoldingCDHoldingCDHolding | Gets the state of the Carrier Detect line for the port. |
| ContainerContainerContainerContainer | Gets the IContainer that contains the Component. (Inherited from Component) |
| CtsHoldingCtsHoldingCtsHoldingCtsHolding | Gets the state of the Clear-to-Send line. |
| DataBitsDataBitsDataBitsDataBits | Gets or sets the standard length of data bits per byte. |
| DesignModeDesignModeDesignModeDesignMode | Gets a value that indicates whether the Component is currently in design mode. (Inherited from Component) |
| DiscardNullDiscardNullDiscardNullDiscardNull | Gets or sets a value indicating whether null bytes are ignored when transmitted between the port and the receive buffer. |
| DsrHoldingDsrHoldingDsrHoldingDsrHolding | Gets the state of the Data Set Ready (DSR) signal. |
| DtrEnableDtrEnableDtrEnableDtrEnable | Gets or sets a value that enables the Data Terminal Ready (DTR) signal during serial communication. |
| EncodingEncodingEncodingEncoding | Gets or sets the byte encoding for pre- and post-transmission conversion of text. |
| EventsEventsEventsEvents | Gets the list of event handlers that are attached to this Component. (Inherited from Component) |
| HandshakeHandshakeHandshakeHandshake | Gets or sets the handshaking protocol for serial port transmission of data using a value from Handshake. |
| IsOpenIsOpenIsOpenIsOpen | Gets a value indicating the open or closed status of the SerialPort object. Malayalam Movie TV is one of the best Entertainment network for Malayalam movies and Entertainments Subscribe now for our up coming Malayalam full movies,We Publish High Quality Videos,Malayalam serials,Malayalam comedy,Malayalam new songs,Malayalam film news,Malayalam classic collections,Malayalam movie reviews,Videos For Families,Videos For Kids Educational Oriented Videos,Malayalam new trailers and much more.Subscribe now for Malayalam movie TV- Find Us on Facebook:+ Follow Us on Twitter:+ Join Us On G+:Get social:#malayalammovietv #movie #malayalam #trailer. Hot star malayalam tv serial. |
| NewLineNewLineNewLineNewLine | Gets or sets the value used to interpret the end of a call to the ReadLine() and WriteLine(String) methods. |
| ParityParityParityParity | Gets or sets the parity-checking protocol. |
| ParityReplaceParityReplaceParityReplaceParityReplace | Gets or sets the byte that replaces invalid bytes in a data stream when a parity error occurs. |
| PortNamePortNamePortNamePortName | Gets or sets the port for communications, including but not limited to all available COM ports. |
| ReadBufferSizeReadBufferSizeReadBufferSizeReadBufferSize | Gets or sets the size of the SerialPort input buffer. |
| ReadTimeoutReadTimeoutReadTimeoutReadTimeout | Gets or sets the number of milliseconds before a time-out occurs when a read operation does not finish. |
| ReceivedBytesThresholdReceivedBytesThresholdReceivedBytesThresholdReceivedBytesThreshold | Gets or sets the number of bytes in the internal input buffer before a DataReceived event occurs. |
| RtsEnableRtsEnableRtsEnableRtsEnable | Gets or sets a value indicating whether the Request to Send (RTS) signal is enabled during serial communication. |
| SiteSiteSiteSite | Gets or sets the ISite of the Component. (Inherited from Component) |
| StopBitsStopBitsStopBitsStopBits | Gets or sets the standard number of stopbits per byte. |
| WriteBufferSizeWriteBufferSizeWriteBufferSizeWriteBufferSize | Gets or sets the size of the serial port output buffer. |
| WriteTimeoutWriteTimeoutWriteTimeoutWriteTimeout | Gets or sets the number of milliseconds before a time-out occurs when a write operation does not finish. |
Methods
| Close()Close()Close()Close() | Closes the port connection, sets the IsOpen property to |
| CreateObjRef(Type)CreateObjRef(Type)CreateObjRef(Type)CreateObjRef(Type) | Creates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object. (Inherited from MarshalByRefObject) |
| DiscardInBuffer()DiscardInBuffer()DiscardInBuffer()DiscardInBuffer() | Discards data from the serial driver's receive buffer. |
| DiscardOutBuffer()DiscardOutBuffer()DiscardOutBuffer()DiscardOutBuffer() | Discards data from the serial driver's transmit buffer. |
| Dispose()Dispose()Dispose()Dispose() | Releases all resources used by the Component. (Inherited from Component) |
| Dispose(Boolean)Dispose(Boolean)Dispose(Boolean)Dispose(Boolean) | Releases the unmanaged resources used by the SerialPort and optionally releases the managed resources. |
| Equals(Object)Equals(Object)Equals(Object)Equals(Object) | Determines whether the specified object is equal to the current object. (Inherited from Object) |
| GetHashCode()GetHashCode()GetHashCode()GetHashCode() | Serves as the default hash function. (Inherited from Object) |
| GetLifetimeService()GetLifetimeService()GetLifetimeService()GetLifetimeService() | Retrieves the current lifetime service object that controls the lifetime policy for this instance. (Inherited from MarshalByRefObject) |
| GetPortNames()GetPortNames()GetPortNames()GetPortNames() | Gets an array of serial port names for the current computer. |
| GetService(Type)GetService(Type)GetService(Type)GetService(Type) | Returns an object that represents a service provided by the Component or by its Container. (Inherited from Component) |
| GetType()GetType()GetType()GetType() | Gets the Type of the current instance. (Inherited from Object) |
| InitializeLifetimeService()InitializeLifetimeService()InitializeLifetimeService()InitializeLifetimeService() | Obtains a lifetime service object to control the lifetime policy for this instance. (Inherited from MarshalByRefObject) |
| MemberwiseClone()MemberwiseClone()MemberwiseClone()MemberwiseClone() | Creates a shallow copy of the current Object. (Inherited from Object) |
| MemberwiseClone(Boolean)MemberwiseClone(Boolean)MemberwiseClone(Boolean)MemberwiseClone(Boolean) | Creates a shallow copy of the current MarshalByRefObject object. (Inherited from MarshalByRefObject) |
| Open()Open()Open()Open() | Opens a new serial port connection. |
| Read(Byte[], Int32, Int32)Read(Byte[], Int32, Int32)Read(Byte[], Int32, Int32)Read(Byte[], Int32, Int32) | Reads a number of bytes from the SerialPort input buffer and writes those bytes into a byte array at the specified offset. |
| Read(Char[], Int32, Int32)Read(Char[], Int32, Int32)Read(Char[], Int32, Int32)Read(Char[], Int32, Int32) | Reads a number of characters from the SerialPort input buffer and writes them into an array of characters at a given offset. |
| ReadByte()ReadByte()ReadByte()ReadByte() | Synchronously reads one byte from the SerialPort input buffer. |
| ReadChar()ReadChar()ReadChar()ReadChar() | Synchronously reads one character from the SerialPort input buffer. |
| ReadExisting()ReadExisting()ReadExisting()ReadExisting() | Reads all immediately available bytes, based on the encoding, in both the stream and the input buffer of the SerialPort object. |
| ReadLine()ReadLine()ReadLine()ReadLine() | Reads up to the NewLine value in the input buffer. |
| ReadTo(String)ReadTo(String)ReadTo(String)ReadTo(String) | Reads a string up to the specified |
| ToString()ToString()ToString()ToString() | Returns a String containing the name of the Component, if any. This method should not be overridden. (Inherited from Component) |
| Write(Byte[], Int32, Int32)Write(Byte[], Int32, Int32)Write(Byte[], Int32, Int32)Write(Byte[], Int32, Int32) | Writes a specified number of bytes to the serial port using data from a buffer. |
| Write(Char[], Int32, Int32)Write(Char[], Int32, Int32)Write(Char[], Int32, Int32)Write(Char[], Int32, Int32) | Writes a specified number of characters to the serial port using data from a buffer. |
| Write(String)Write(String)Write(String)Write(String) | Writes the specified string to the serial port. |
| WriteLine(String)WriteLine(String)WriteLine(String)WriteLine(String) | Writes the specified string and the NewLine value to the output buffer. |
Events
| DataReceivedDataReceivedDataReceivedDataReceived | Indicates that data has been received through a port represented by the SerialPort object. |
| DisposedDisposedDisposedDisposed | Occurs when the component is disposed by a call to the Dispose() method. (Inherited from Component) |
| ErrorReceivedErrorReceivedErrorReceivedErrorReceived | Indicates that an error has occurred with a port represented by a SerialPort object. |
| PinChangedPinChangedPinChangedPinChanged | Indicates that a non-data signal event has occurred on the port represented by the SerialPort object. |
Security
SecurityPermission
for the ability to call unmanaged code. Associated enumeration: UnmanagedCode
Applies to
-->This topic describes how to use My.Computer.Ports to receive strings from the computer's serial ports in Visual Basic.
To receive strings from the serial port
Initialize the return string.
Determine which serial port should provide the strings. This example assumes it is
COM1.Use the
My.Computer.Ports.OpenSerialPortmethod to obtain a reference to the port. For more information, see OpenSerialPort.The
Try..Catch..Finallyblock allows the application to close the serial port even if it generates an exception. All code that manipulates the serial port should appear within this block.Create a
Doloop for reading lines of text until no more lines are available.Use the ReadLine() method to read the next available line of text from the serial port.
Use an
Ifstatement to determine if the ReadLine() method returnsNothing(which means no more text is available). If it does returnNothing, exit theDoloop.Add an
Elseblock to theIfstatement to handle the case if the string is actually read. The block appends the string from the serial port to the return string.Return the string.
Example
This code example is also available as an IntelliSense code snippet. In the code snippet picker, it is located in Connectivity and Networking. For more information, see Code Snippets.
Compiling the Code
This example assumes the computer is using COM1.
Robust Programming
This example assumes the computer is using COM1. For more flexibility, the code should allow the user to select the desired serial port from a list of available ports. For more information, see How to: Show Available Serial Ports.
This example uses a Try..Catch..Finally block to make sure that the application closes the port and to catch any timeout exceptions. For more information, see Try..Catch..Finally Statement.