Hi Dhanalakshmi Sreerama ,
The CDC VCOM demo in KSDK 1,2 (C:\Freescale\KSDK_1.2.0\examples\frdmk64f\demo_apps\usb\device\cdc\virtual_com\bm\kds) can accept any length of string, even any format of file, you may use a txt file to test with it. To download KSDK 1.2, please refer to Software Development Kit for Kinetis MCUs|Freescale for details.
Hope that help,
Have a great day,
Kan
Freescale Technical Support
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