Ea elektro automatik ea if shortened interfaces ea elektro automatik 33100221 this is the ea elektro automatik if r2 digital interface between power supplies or electronic loads and pcs or plcs these pluggable cards are recognised by the host unit automatically and corresponding menu choices become enabled the if r2 supports the parallel or serial connection of multiple power supplies or electronic loads in the ea psi and ea el series to create a masterslave system using system link mode