Freelance HW config, FDT or GSD for configuring S800 IO? (Pros and cons)
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At the end result is same using gsd or FDT/DTM, only difference is way to configure and use. In case of GSD you need to configure each bit's and byte from scratch for that you need have memory map information. Whereas using via FDT/DTM you get pre-configured gui window of S800 I/O or drive and as user you just need to make a few selection for using hardware.
Also note that for using FDT/DTM user need license whereas via gsd license not needed.If you have access to partner portal there is good webinar recording and presentation on this topic
Hope that helps...