5½ Digit Multimeter Reference Manual Appendix C: Communication interface
2110-901-01 Rev. C/August 2013 C-7
Additional USB information
This section provides further details and more advanced information about the USB bus and
test-and-measurement instruments.
Connecting multiple USB instruments to the computer
The most convenient way to connect USB instrumentation to the computer is to plug a USB cable
directly from the instrument to the computer. If you have more than one USB instrument or have other
USB devices, such as printers, keyboards, and mice, you might not have enough USB connectors on
the computer.
To gain more ports, you can use a USB hub or add more USB controller cards if you have available
PCI or PCI Express slots.
There are two types of USB hubs that you can use with Model 2110:
• Bus powered: This type of hub draws its power from the USB bus and can only supply 100 mA
(USB 2.0) per port.
• Self powered: This type of hub has an external power supply and can supply up to 500 mA per port
(USB 2.0).
GPIB setup
This section contains information about GPIB standards, connections, and address selection.
The GPIB connector is optional and may not be present on your instrument.
GPIB standards
The GPIB is the IEEE-488 instrumentation data bus, which uses hardware and programming
standards originally adopted by the Institute of Electrical and Electronic Engineers (IEEE) in 1975.
The instrument is IEEE Std 488.1 compliant and supports IEEE Std 488.2 common commands and
status model topology.
Install the GPIB cards in your computer
Refer to the manufacturer's documentation for information about installing the GPIB cards.
Install the GPIB driver software
Check the documentation for your GPIB controller for information about where to acquire drivers.
Keithley Instruments also recommends that you check the vendor's website for the latest version of
drivers or software.
It is important that you install the drivers before you connect the hardware to prevent associating the
incorrect driver to the hardware.
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