Good day to all, Please I need your guide and support on how to use this function: Code: ftStatus = myFtdiDevice.Read(readData, numBytesAvailable,ref numBytesRead); to read byte from the serial port.This function is part of the DLL that came with the chip(FT2232D) I am using on my board.I want to use the function to read a byte from the serial port and then send the value to the Graphic user interface.Unfortunately I was unable to get the expected value on my GUI.If I send for instance 40,what I get on the GUI are letters instead of the number 40 or at times the GUI will not even respond.Below are my lines of code I used to read the byte from the serial port: The following instructions are executed whenever the CHECKBOX is checked Code: private void checkBox1_CheckedChanged(object sender, EventArgs e) { UInt32 numBytesRead = 0; UInt32 numBytesAvailable = 1; ftStatus = myFtdiDevice.Read(readData, numBytesAvailable, ref numBytesRead); label11.Text =Convert.ToString(ftStatus); } Below is the definition of the function from the supplied library: Code: Read data from an open FTDI device. // // Parameters: // dataBuffer: // An array of bytes which will be populated with the data read from the device. // // numBytesToRead: // The number of bytes requested from the device. // // numBytesRead: // The number of bytes actually read. // // Returns: // FT_STATUS value from FT_Read in FTD2XX.DLL publicFTDI.FT_STATUS Read(byte[] dataBuffer, uint numBytesToRead, refuint numBytesRead); Your guide and assistance will be highly appreciated in this regard. Best regards.