Acces USB-IIRO-8 USB Isolated Digital IO Module

ACCES USB-IIRO-8 is a USB-connected isolated digital I/O module that delivers eight optically isolated digital inputs and eight Form C relay outputs, enabling safe interfacing of external sensors and control devices to a host PC or embedded system. Each input channel is optically isolated from the others and from the computer, with an input voltage range of 5 to 24 V (rms) suitable for AC or DC signals, including 12/24 VAC control transformers or DC sources. A switchable slow/fast input filter with a 10 ms time constant supports debouncing and noise suppression and can be configured for AC or DC inputs to balance response time and noise rejection. The eight relay outputs are electromechanical Form C relays rated for 2 A carry current, allowing direct control of loads such as lamps, motors, or solenoids. The module also supports change‑of‑state (COS) detection on inputs and can generate interrupts when input states change, enabling responsive software handling. Designed, manufactured, and supported in the USA, the USB-IIRO-8 belongs to ACCES I/O’s IIRO family, offering a USB interface with the same core isolated input and relay output architecture found across PCI, PCIe, and mPCIe variants. This combination of isolation, input range, programmable filtering, and Form C relay outputs makes the USB-IIRO-8 suitable for industrial automation, building management, and lab environments that require safe, electrically isolated control from a host computer.