Agilent Technologies USB/GPIB Interface Converter 82357A - Manual (Page 36)

36 Chapter 2
Using the 82357A
Modes of Operation
Introduction to 82357A Operating Modes
The 82357A has two modes of operation. When only one 82357A is
connected to a USB port within a system, we define the operation as the
single mode of operation . When two or more 82357As are connected at the
same time to USB ports within a system, we define the operation as the
multiple mode of operation .
Single Mode
Features
For the single mode of operation, the operating parameters (VISA Interface
ID, SICL Interface ID, Logical Unit Number, and GPIB Address) are set
when the 82357A is first installed and configured.
If this 82357A is unplugged and replugged or if the 82357A is replaced with
a different 82357A, the original configuration parameters are automatically
assigned to the newly attached 82357A. Thus, you can exchange 82357As
at any time without reconfiguring the interface. This allows exchanging
82357As among users, as long as only one 82357A is attached at any one
time.
Multiple Mode
Features
In contrast, when two or more 82357As are connected to the system at
the same time, each 82357A must have its own specific set of operating
parameters and each 82357A Serial Number is “bound” to its operating
parameters. In multiple mode of operation, if you add a new 82357A or if
you unplug an 82357A and plug in a new 82357A, the newly installed
82357A will be assigned a new (unique) set of operating parameters.
NOTE
All SICL/VISA applications are notified when their 82357A has been
removed from the system by returning
VI_ERR_NOINFC (for VISA) or
I_ERR_NCIC (for SICL).
NOTE
Each time you attach a new 82357A, if Connection Expert is not running,
an
Agilent 82357A USB/GPIB Interface Detected dialog box will be
displayed. If Connection Expert is running, the Connection Expert window
will automatically refresh as the new 82357A is configured.