The USB input/output modules in USB stick format are available in three versions: two relay outputs (normally open), 8 TTL input/output channels, or 8 optocoupler inputs. They can be connected via a D-SUB9 socket. A status LED indicates USB access to the stick. The standards USB 2.0 and USB 1.1 are supported. The transmission rates are 12 MBit/s or 1.5 MBit/s. With the included driver library DELIB, easy access to the module is possible, providing all the corresponding functions. A small VB test program and plenty of example software are included on CD. Up to 16 USB modules can be used per PC by assigning an ID number.