Information on how to perform this change is provided in the "Change Configuration Information" paragraph of section 4 in the National Instruments GPIB-VXI/C User Manual. These are the basic steps to make the needed changes. Connect an ANSI terminal or emulation program to the Slot-0 serial port. Set the communication protocol for 9600,8,N,1 Power up the VXIbus mainframe. At the prompt, enter "CONF". Select #3. Select #6. Change GPIB Primary Address to 2 (or what ever you prefer). Select "Q". Select #5. Select #6.