modbus

[rogue]

hey everybody

I want to do a rotating machinery diagnostic with the 3500 rack from Bently nevada, I try to make my own driver on labview to collect informations from velometer and keyphasor.

My problem is that I did not succed to obtain the FFT (fast fourrir transform) from my signal, so I don't understand why it's not work...

I measure  a pompe vibrations wich frequencies vary from 50 to 2000HZ, but the 3500 rack use a Modbus protocol to communicate with my PC, my LabView Program use 250 ms (4Hz)  to do one measure, so is this the problem? the ModBus is so Slow???

thank's for your help

[GerdW]

Duplicate post, go there:
http://forums.ni.com/ni/board/message?board.id=170&message.id=189617