USB-connected hardware interface device
PRAXIS version 2 includes internal script programming support for the LabJack U12 device. This allows you to control up to 20 digital input/output lines, 8 analog inputs, and 2 analog output voltages -- from a PRAXIS script! Use it to control relays, motors, bias voltages, detect conveyors, etc.
The LabJack connects to your computer using a USB interface (just like the AudPod does), and is compact and rugged -- so it can be easily transported or swapped between systems. Installation is easy, operation is reliable. Digital connections can be made via a 25-pin D-Connector (for quick connect/disconnect). Analog connections are available via a multitude of screw terminals.
LabJack requires no power supply -- it is powered from the USB bus. Even better, LabJack provides you with a 5V supply source (from your computer) for powering small devices and adaptor circuitry. How easy can it get?
Liberty Instruments can supply the LabJack U12 for $119 each (plus shipping/handling).