Hi
U require the software : NT SupportTool to access the HMI. U can connect directly to the PC with a serial port. Port of HMI will be 9-pin female and U require a Serial 9-pin male to 9-Pin[m/f PC depend] cable. U can make out the cable easily. The pin connections are so easy.
In NT Support software, open a file, Select the model and Comm port. Just click the Upload option. If Connection is perfect, Data will be loaded to the file.
Note: Normally Software will be issued with HMI's.