User`s manual

5. Only one Command Module is required to translate SCPI
commands for the system’s Agilent register-based modules -
provided the register-based modules are in the Command Module’s
servant area, they are assigned secondary addresses, and the
Command Module contains the instrument drivers.
6. When a Command Module is in the servant area of another
Command Module, the Command Module functioning as the
resource manager will report one of the following error conditions:
Error 11: INVALID INSTRUMENT ADDRESS
3, Config warning, Device driver not found
Error 11 occurs when the Command Module’s logical address is not
a multiple of 8. The configuration warning occurs when the logical
address is a multiple of 8. In either case, the error or warning can be
ignored.
7. Communication and timing between a Command Module and its
servants is achieved using VXIbus backplane interrupt lines. The
interrupt lines are assigned at power-on by the resource manager.
The Command Module resource manager assigns interrupt line 1 to
itself. The other interrupt lines are assigned to the system’s
programmable handlers. Unused interrupt lines are not assigned.
Agilent’s register-based modules are factory-set to interrupt line 1.
Thus, for those modules which are servants to a Command Module
assigned an interrupt line other than 1, the jumper must be moved to
match their Command Module. Refer to the module’s
documentation for the jumper location. The Command Module
resource manager configuration sequence earlier in this procedure
shows the interrupt line assigned.
2-16 Setting Up the E1406 Command Module C-Size Configuration Guide