NI 9403 Pinout & Connections

Hello,

I am developing a test PCB to use with the NI 9403  5VTTL Digital I/O:

I am controlling a bank of 32 MOSFETs (N-Channel) to conduct open circuit testing on the DUTs. I noticed that pin 19 on the NI 9403 connector is marked RSVD. A quick search of the forums lead me to this post:

http://forums.ni.com/t5/Digital-I-O/In-the-NI-9403-pinout-what-is-RSVD-on-pin-19-mean/td-p/792905

It seems this pin is "reserved" but I can find no documentation on it in the NI 9403 datasheet. Does anyone know if I need to tie this pin to anything (ie. GND) on my PCB, or leave it floating?

Thanks!