Hi Albert,
I have found the manual for the NI9505 which contains information on drive protection on the device.
http://www.ni.com/pdf/manuals/374211f.pdf
Having looked through the manual. On page 28, it states 'Motor terminal short to ground' and 'Motor terminal short to Vsup' are both 'Yes'. There is also some information on the safety voltages on page 32 of the manual.
I hope that helps. If you have any other questions, please feel free to post back.
Kind Regards,
Oli
LabVIEW Student Ambassador
National Instruments UK