Compact USB Optically Isolated I/O Module with Dual RS-232/422/485 Serial Communication Ports

San Diego, CA (PRWEB) December 13, 2006

ACCES I/O Products, Inc. is pleased to announce another addition to its successful line of USB embedded data acquisition modules — Model USB-IIRO4-2SM. This dense multifunction device incorporates four optically isolated digital inputs, four Form C (SPDT) electromechanical relay outputs, and two RS-232/422/485 serial communication ports — all packaged in a small, rugged, industrial enclosure. This USB device is an ideal solution for adding portable, easy-to-install, digital and serial capabilities to any PC or embedded system with a USB port. It is fully compatible with both USB 1.1 and USB 2.0 ports. Hot-plug functionality allows for quick connect/disconnect whenever additional I/O on a USB port is needed. This single USB device is ideal for a variety of applications where on-board relays are required and inputs must be isolated such as in test equipment, instrumentation, industrial monitoring, process control and communication. The OEM version provides just the board without the enclosure and is ideal for a variety of embedded OEM applications.

Electromechanical Form C relays are used due to their robustness and ability to withstand unexpected surge currents. This allows for increased flexibility in switching capability. These relays are used in environments where small reed relays would be considered inadequate due to their susceptibility to contact damage. The unit also features a high-speed custom function driver optimized for a maximum data throughput that is 50-100 times faster than the USB human interface device (HID) driver used by many competing products. This approach maximizes the full functionality of the hardware and capitalizes on the advantages of USB. To simplify wiring connections, the isolated inputs and relay outputs are available via a mounted DB25 connector or, for OEMs, a 26-pin IDC vertical shrouded header. An additional USB input header is provided for embedded applications along with a downstream USB port for connecting additional USB devices. Serial communications are conveniently provided through two DB9 connectors with adjacent LEDs indicating serial port activity.

Key features of the USB-IIRO4-2SM include:

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