which it is the difference between GPIB and GPIO? thanks
GPIB is a parallel cable interface specification that’s been around for years (IEEE 488), used to connect peripheral devices to computers. GPIO is just Digi’s abbreviation for the term “general purpose I/O”.
If you are looking to connect to GPIB/IEEE 1488 devices over Ethernet, you could use a serial-to-GPIB converter (such as www.printcapture.com/files/GPIB-232CV-A_Data_Sheet.pdf) along with a Digi module that includes Ethernet and serial, or you could use a native GPIB–>Ethernet converter such as (www.ni.com/pdf/products/us/4gpib677-680.pdf).
GPIO only gives you control of and access to Digital inputs and outputs.