I am designing a board that has 2 DB9 plugs/connectors. They are used to supply power(Vcc and GND) and data signals respectively. Now, I wont be using all the pins in the DB9. Some will be left floating.
I will then be trying to get FCC/CE certifications for the board. Now, I know, at least in MCUs and such ICs, pins are not left floating. They are eithey pulled up to Vcc or down to GND. Do, I need to do any such thing to some of the unconnected DB9 pins ? If so, what are the criteria or design changes I need to make to them ?