The usb inputoutput modules in the usb stick format are present in 3 designs two relay outputs closer 8 ttl inputsoutputs or 8 opto coupler inputs these can be connected via a d sub9 socket a status led signals the usb access to the stick it supports most standard usb 20 and usb 11 the transmission rates are 12 m bit s or 15 m bit s the accompanying driver library delib enables an easy addressing of the module with this all the corresponding functions are made available a sm