The IA-3133-U2i is an Intelligent-Appliance Dual/Quad line Relay Multiplexer board with 32/16 states, also defined as a 32 Differential channel selector or as a 16 Dual Differential channel selector. The Relay Multiplexer Board includes a "break before make" mechanism and can be used as an electronic sequencer, a random state activator or multi-state activator, software selectable. The IA-3133-U2i includes both USB and RS-232 ports that can be directly connected to any PC computer, or it can be chained by it's built in Daisy Chain facility. The IA-3133-U2i is a Series-3000 compatible, with the same software support package, open source samples,