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The K8055 interface board has 5 digital input channels and 8 digital output channels. In addition, there are two analogue inputs and two analogue outputs with 8 bit resolution. The number of inputs/outputs can be further expanded by connecting more (up to a maximum of four) cards to the PC's USB connectors. All communication routines are contained in a Dynamic Link Library (DLL). You may write custom Windows (98SE, 2000, Me, XP) applications in Delphi, Visual Basic, C++ Builder or any other 32-bit Windows application development tool that supports calls to a DLL.  Features DIAGNOSTIC / TEST SOFTWARE: separate output / input test clear all / set all function counter function on inputs 1 and 2 with adjustable debounce (max 2kHz depends on total I/O load) analog output set sliders analog input bar-graph indication minimum system requirements: Pentium class CPU USB1.0 or higher connection Windows 98SE or higher (Win NT excluded) CD ROM player and mouse also available in mounted version  Specifications 5 digital inputs (0= ground, 1= open) (on board test buttons provided) 2 analog inputs with attenuation and amplification option (internal test +5V provided) 8 digital open collector output switches (max. 50V/100mA) (on board LED indication) 2 analog outputs: 0 to 5V, output resistance 1K5 PWM 0 to 100% open collector outputs max 100mA / 40V (on board LED indication) general conversion time: 20ms per command power supply through USB: approx. 70mA diagnostic software with DLL included dimensions: 5.7" x 3." x 0.8"  Downloads   - Manuals Illustrated_assembly_manual_K8055_UK.pdf (719 kB) Usermanual_K8055_DLL_UK.pdf (46 kB)  Extra Info    - link for Linux application http://linuxk8055.free.fr