GPIB Hardware Installation Guide and Specifications | © National Instruments | 3
To prevent damage to your GPIB-USB hardware and other system components, do
any of the following:
• Ensure that your system and all instruments connected to it share the same ground
potential. This eliminates the possibility of voltage differential running through
your system.
• Use a GPIB-120B Bus Isolator/Expander to isolate GPIB systems and expand the
GPIB interface up to 28 devices.
• Use a pair of GPIB-140A High-Speed Fiber-Optic Bus Extenders. This
transforms the GPIB signals at each end into fiber optic signals, allowing each
unit to reside at a different ground potential.
• Use an isolated USB hub.
Complete the following steps to install your interface:
1. Connect the USB connector from the GPIB-USB interface to an available USB Type A port
on your computer.
2. Before connecting the GPIB-USB interface to GPIB devices, ensure that the computer and
the GPIB devices are at the same ground potential. The GPIB-USB interface connects
directly to most GPIB devices without requiring a GPIB cable.
3. If your computer is already running, the operating system automatically detects the GPIB
interface. Otherwise, the GPIB interface is detected when you start your computer.
Figure 1. Installing the GPIB-USB Interface
The GPIB hardware installation is now complete.
1 Computer 2 USB Connector 3 GPIB-USB Interface 4 To GPIB Devices
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