MarshallSoft serial communication component VB and .NET library for RS232 and multi-drop RS485 and RS422 serial ports. Supports virtual serial ports (USB to serial converter and Bluetooth serial). Uses the standard Windows API to communicate with any device connected to a serial port. Includes 38 functions plus modem control, ANSI emulation, ASCII/XMODEM/YMODEM protocols, hardware and software flow control (XON/XOFF, RTS/CTS, DTR/DSR). Includes multiple example programs. State driven Xmodem and Ymodem on multiple ports simultaneously (up to 256 connections). Is port re-entrant. Is fully thread safe. Can send Windows messages on completion of events (incoming character, etc.). Supports all versions Visual Basic 3.0 through Visual Studio 2010 (VB.NET). Also use with VBA programs. Free technical support and updates for one year. Source code available. Win64, Win32 and Win16 DLLs. Windows 95/98/Me/NT/2000/2003/XP/Vista/Win7