The IA-3128S-U2i is an Industrial Relay Board with 24-ch Relay, 24-ch Isolated Digital Inputs, Isolated USB Port and transparent Daisy-Chain facility based on buffered RS-232 Interface ports. In addition to the Isolated Digital Inputs there is software based Digital Filter with a variable frequency cut point to best fit customer need. Two 24bit Event Counter channels were implemented into the card’s facility, connected to the two last Digital Inputs ch-23 and ch-24, with a 500Hz maximum counting frequency, that equals 30,000 RPM in case of a pulse per revolution. The IA-3128S-U2i is CE and FCC approved, with contact rating of 5Amp at 30VDC and 250VAC. The software support package includes DOT.net Library, Open Source software examples and Configuration and Operation utilities for fast software implementation.