User`s manual

The embedded computer’s servant area should be set to 255. Thus, if the
embedded computer’s logical address is 0 and its servant area setting is 255,
the embedded computer will be the top-level commander for all modules
with logical address between 1 and 255.
When the command module is a servant to an embedded computer, the
following guidelines apply:
• For the Command Module to be the commander for a register-based
module, the register-based module’s logical address must fall within
the Command Module’s servant area.
• The Command Module’s logical address plus the Command
Module’s servant area cannot exceed 255. Recommended Command
Module logical addresses are 1, 2, and 3 (0 is reserved for the
resource manager, the embedded computer). Therefore, the servant
area should be set based on the logical addresses of the
register-based modules in your system.
What is the
Command Module’s
Primary GPIB
Address?
GPIB is the implementation of ANSI/IEEE Standard 488.1-1978 "IEEE
Standard Digital Interface for Programmable Instrumentation". The primary
GPIB address identifies the GPIB port on the Command Module. This
address is combined with the Command Module’s secondary GPIB address
(always 00), and with the external computer’s (GPIB) interface select code
(typically 7 for HP Computers), to form the Command Module’s complete
GPIB address.
The following guidelines will help you set the Command Module’s primary
GPIB address:
• The Command Module has a factory-set GPIB address of 9. If there
is only one Command Module (i.e. only one GPIB port) in your
VXIbus mainframe, then it is not necessary to change this setting. If
there are additional Command Modules in a system connected to the
same computer GPIB interface card, each module must have a
unique primary GPIB address.
• Valid primary GPIB addresses are 0 through 30.
C-Size Configuration Guide Terms and Definitions A-7