National Instruments NI-488.2 - page 14

Chapter 1 Introduction
© National Instruments Corporation 1-3 NI-488.2 User Manual for Windows
For high-speed operation, the following restrictions apply:
•All devices in the system must be powered on.
•Cable lengths must be as short as possible with up to a maximum of
15 m of cable for each system.
•There must be at least one equivalent device load per meter of cable.
If you want to exceed these limitations, you can use a bus extender to
increase the cable length or a bus expander to increase the number of device
loads. You can order bus extenders and expanders from National
Instruments.