How to Read and Write from the Serial Port

Question

I just start to learn how to send and receive data from my hardware through the C  GUI   Can anyone please write a detail how to read data from the serial port

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Note that usage of a SerialPort DataReceived event is optional  You can set proper timeout using SerialPort ReadTimeout and continuously call SerialPort Read   after you wrote something to a port until you get a full response    Moreover you can use SerialPort BaseStream property to extract an underlying Stream instance  The benefit of using a Stream is that you can easily utilize various decorators with it   var port   new SerialPort       LoggingStream inherits Stream  implements IDisposable  needen abstract methods and     overrides needen virtual methods   Stream portStream   new LoggingStream port BaseStream   portStream Write          Logs write buffer  portStream Read          Logs read buffer    For more information check    Top 5 SerialPort Tips article by Kim Hamilton  BCL Team Blog C  await event and timeout in serial port communication discussion on StackOverflow

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I spent a lot of time to use SerialPort class and has concluded to use SerialPort BaseStream class instead  You can see source code  SerialPort-source and  SerialPort BaseStream-source for deep understanding  I created and use code that shown below      The core function public int Recv byte   buffer  int maxLen  has name and works like  well known  socket s recv     It means that    in one hand it has timeout for no any data and throws TimeoutException  In other hand  when any data has received     it receives data either until maxLen bytes  or short timeout  theoretical 6 ms  in UART data flow        public class Uart   SerialPort                private int  receiveTimeout           public int ReceiveTimeout   get   gt   receiveTimeout  set   gt   receiveTimeout   value             static private string ComPortName                     lt summary gt              It builds PortName using ComPortNum parameter and opens SerialPort               lt  summary gt               lt param name  ComPortNum  gt  lt  param gt          public Uart int ComPortNum    base                         base BaudRate   115200     default value                         receiveTimeout   2000              ComPortName    COM    ComPortNum               try                               base PortName   ComPortName                  base Open                              catch  UnauthorizedAccessException ex                                Console WriteLine  Error  Port  0  is in use   ComPortName                             catch  Exception ex                                Console WriteLine  Uart exception      ex                             Uart                 lt summary gt              Private property returning positive only Environment TickCount              lt  summary gt          private int  tickCount   get   gt  Environment TickCount  amp  Int32 MaxValue                   lt summary gt              It uses SerialPort BaseStream rather SerialPort functionality               It Receives up to maxLen number bytes of data               Or throws TimeoutException if no any data arrived during ReceiveTimeout               It works likes socket-recv routine  explanation in body               Returns                 totalReceived - bytes                  TimeoutException                 -1 in non-ComPortNum Exception                lt  summary gt               lt param name  buffer  gt  lt  param gt               lt param name  maxLen  gt  lt  param gt               lt returns gt  lt  returns gt          public int Recv byte   buffer  int maxLen                            The routine works in  pseudo-blocking  mode  It cycles up to first                  data received using BaseStream ReadTimeout   TimeOutSpan  2 ms                   If no any message received during ReceiveTimeout property                   the routine throws TimeoutException                  In other hand  if any data has received  first no-data cycle                 causes to exit from routine               int TimeOutSpan   2                 counts delay in TimeOutSpan-s after end of data to break receive             int EndOfDataCnt                 pseudo-blocking timeout counter             int TimeOutCnt    tickCount    receiveTimeout                 number of currently received data bytes             int justReceived   0                number of total received data bytes             int totalReceived   0               BaseStream ReadTimeout   TimeOutSpan                causes  2 1  TimeOutSpan delay after end of data in UART stream             EndOfDataCnt   2              while   tickCount  lt  TimeOutCnt  amp  amp  EndOfDataCnt  gt  0                                try                                       justReceived   0                       justReceived   base BaseStream Read buffer  totalReceived  maxLen - totalReceived                       totalReceived    justReceived                       if  totalReceived  gt   maxLen                          break                                    catch  TimeoutException                                        if  totalReceived  gt  0                           EndOfDataCnt--                                    catch  Exception ex                                                           totalReceived   -1                      base Close                        Console WriteLine  Recv exception      ex                       break                                     while             if  totalReceived    0                                              throw new TimeoutException                              else                                              return totalReceived                             Recv                        Uart

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SerialPort  RS-232 Serial COM Port  in C   NET This article explains how to use the SerialPort class in  NET to read and write data  determine what serial ports are available on your machine  and how to send files   It even covers the pin assignments on the port itself   Example Code   using System  using System IO Ports  using System Windows Forms   namespace SerialPortExample     class SerialPortProgram            Create the serial port with basic settings     private SerialPort port   new SerialPort  COM1         9600  Parity None  8  StopBits One         STAThread      static void Main string   args                  Instatiate this class       new SerialPortProgram               private SerialPortProgram               Console WriteLine  Incoming Data               Attach a method to be called when there          is data waiting in the port s buffer       port DataReceived    new          SerialDataReceivedEventHandler port DataReceived             Begin communications       port Open              Enter an application loop to keep this thread alive       Application Run               private void port DataReceived object sender        SerialDataReceivedEventArgs e                 Show all the incoming data in the port s buffer       Console WriteLine port ReadExisting

[c#] How to Read and Write from the Serial Port

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