 
      
      serialThis class provides a serial port interface
class serialThis class does not inherit to any class.
This class does not have attributes.
construct() — The constructor. Create an instance of class serial and open the port        close() — Close the serial port        get_error() — Get the error string        is_open() — Get the open status of the serial port        read() — Read a given amount of bytes from the serial port and then return a string containing the data        readln() — Read from the serial port until eol_char is received        write() — Write a string to the serial port