Does the GPIO-104 provide isolation between the I/O signals and the PC/104 host?
There is no electrical isolation circuitry provided. The ADIO-104 was designed to keep the I/O signal path as “pure” as possible and to offer a competitively priced product that would satisfy many typical applications. However, if isolation is required it can be accomplished externally. This is typically done using Analog Devices xB type modules or similar components which accept field signals, provide isolation and scaling and then present them to the GPIO-104 in the proper voltage range.
