Hello Preetam,
What exactly would you like to check on the DIO lines? You could just wire all DI lines to ground and verify that you are reading low on all lines. Alternatively, you could wire a DI to a DO line and verify that you are reading and writing the correct values.
All you need to do is externally wire your DIO lines and then verify that they are working by using the Digital Reader and Writer.
Let me know if you have any further questions.
Regards,
Sean C.