User`s manual

Note, however, you cannot combine multiple modules of the same type
such as multimeters, counters, and function generators into virtual
instruments.
What is the Logical
Address?
Every device in a VXIbus system has a unique logical address. In Agilent
VXIbus systems, the logical address is used to:
• Create instruments
• Establish servant areas
• Derive secondary GPIB addresses that are used to program
instruments from the GPIB
• Determine the base address of the device’s registers in A16 address
space
• Set the device as the system resource manager (Agilent E1406
Command Module)
Setting the Logical
Address
The following guidelines will help you set logical addresses:
• Notice the factory-set logical address. Most Agilent Technologies
modules such as DMMs, counters, and function generators have a
factory-set address that is an Instrument Identifier (multiple of 8, 8,
16, 32, etc).
• Valid logical addresses are 1 through 255. To dynamically configure
a module which supports dynamic configuration, its logical address
must be set to 255. However, if a statically configured module is set
to 255, the resource manager will not dynamically configure any
module.
• If your system consists of statically and dynamically configured
modules, set the statically configured modules to the "lower"
multiples of 8 (e.g. 8, 16, 24). The dynamically configured modules
will be assigned Instrument Identifier addresses beginning with the
lowest available multiple of 8. If all multiples are used, the
dynamically configured module is given the first available address.
• A plug-in module with a logical address that is not a multiple of 8,
or that is not part of a virtual instrument, is an unassigned module.
Such modules must be programmed at the register level, rather than
with SCPI commands. (A secondary GPIB address can be given to
an unassigned module with the Command Module’s User-Defined
Commander/Servant Hierarchy table (see the Agilent E1406 User’s
Manual).)
A-10 Terms and Definitions C-Size Configuration Guide