Serial communications C/C++ and .NET library for RS232 and multi-drop RS485 and RS422 serial ports. Provides capability to easily develop C/C++ and .NET applications that access data from any serial port device. Supports 256 ports, control multiple ports simultaneously, modem control, virtual serial ports (USB to serial, Bluetooth serial), port re-entrant, hardware/software flow control, serial line status & control. etc. Royalty free.