/// <summary>
/// Create virtual serial port.
/// </summary>
/// <param name="slaveTerminalName">Name of virtual serial port.</param>
/// <returns>Device Id of virtual serial port.</returns>
public int CreateVirtualSerialPort(out string slaveTerminalName)
{
int deviceId = 0;
IntPtr ptrSlaveTerminalName = EcHL.CreateVirtualSerialPort(out deviceId);
slaveTerminalName = Marshal.PtrToStringAnsi(ptrSlaveTerminalName);
return(deviceId);
}