pluggable, making it easy to
connect and disconnect without
having to shut down the
computer. No external power
supplies are necessary.
Full Assurance for
Interoperability
The USB/GPIB interface ships
with the Agilent I/O Libraries
Suite that includes VISA and
SICL. VISA enables interoper-
ability among different
instrument and software
vendors. The IO Libraries Suite
also provides robust instrument
control and works with the
software development of your
choice.
Standard GPIB functionality is
provided by implementing the
IEEE 488.1 and IEEE 488.2
specifications. These
specifications provide defined
mechanical and electrical char-
acteristics, and a basic set of
instrument commands and
common data formats.
Using industry standards gives
you the assurance and
confidence that your programs
will work with multiple
hardware and software vendors,
and migrate to new standards
in the future.
Standard Computer IO
In the past, RS-232 and GPIB
have been the primary
interfaces used for connecting
instruments to PCs in test and
measurement applications.
Although RS-232 offers a low-
cost solution, RS-232’s lower
baud rate and connection
limitations are cumbersome and
too slow for many of today’s
measurement needs.
GPIB has provided a high
performance, cost effective, and
for more than 25 years. Today,
however, computers have fewer
available IO slots, leaving
engineers with little options but
to use more expensive solutions
such as industrial PCs.
With USB and LAN built into
most of today’s PCs, standard
computer IO has evolved into
a solution that is acceptable for
automation and control of test
and measurement instruments.
The early USB devices that
were initially developed for
connecting PCs to peripherals
such as keyboard, mouse and
so forth offered little
bandwidth. Today, USB offers
bandwidths up to 12 Mbits/s
for USB 1.1 and 480 Mbits/s
for USB 2.0. The 82357B
USB/GPIB interface runs at
USB 2.0.
The 82357B USB/GPIB interface
uses a thin, flexible, high-
quality USB cable that is USB
1.1 and 2.0 compliant. This
cable is shielded and specified
to 1,500 insertions, ensuring a
durable connection and reliable
data transfer.
The 82357B is capable of
transfer rates over 1.15 MB/s
with large block transfers. The
performance is better than
typical GPIB cards for block
sizes over 32KB. Small block
transfers are limited by the
USB
implementation and the
overhead associated with setting
up the transfer. However, since
instrument setup time can
dominate the overall test time,
this impact may be minimal.
If small block transfer
performance is critical, then
you may consider the Agilent
82350A PCI GPIB interface.
Make the Connection
You may connect directly to
one instrument with no
additional GPIB cables required
with the 82357B USB/GPIB
interface.
For multiple instruments
connection, use a daisy chain or
star configuration with your
GPIB instruments using
standard GPIB cables. Once the
instruments are connected,
connect the USB/GPIB interface
as the last connection on one
of the instruments. One 82357B
USB/GPIB interface supports up
to 14 GPIB instruments. Multiple
82357B USB/GPIB interfaces can
be connected to improve system
performance.
Another additional significant
feature would be the parallel
polling capability of the 82357B
USB/GPIB interface. This allows
you to easily check up to eight
individual devices at once,
corresponding to the number of
data lines on the GPIB.
(126 páginas)
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