SerialPort.Write Method (Char, Int32, Int32)
Writes a specified number of characters to the serial port using data from a buffer.
Assembly: System (in System.dll)
The buffer passed is a null reference (Nothing in Visual Basic).
The specified port is not open.
The offset or count parameters are outside a valid region of the buffer being passed. Either offset or count is less than zero.
offset plus count is greater than the length of the buffer.
The operation did not complete before the time-out period ended.
Use this method when you want to write to a character buffer to create output to a serial port.
By default, SerialPort uses ASCIIEncoding to encode the characters. ASCIIEncoding encodes all characters greater than 127 as (char)63 or '?'. To support additional characters in that range, set Encoding to UTF8Encoding, UTF32Encoding, or UnicodeEncoding.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.