Chapter 2
Configuration and Startup Procedures
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ni.com
Each entry in the table represents the logical address of the handler that
handles the corresponding level—1 through 7. If the handler is static,
PI Servants are assigned to the level. If the device is a PH device, the RM
assigns both it and any PI Servants to the corresponding level. Notice that
if the table entry is FFh, the level is free to be assigned to any PH device.
If only PH and PI devices are in a system, all entries may contain FFh.
Refer to Chapter 4,
, for more information.
The remainder of the RM procedure depends upon whether the RM found
any DC devices in the system.
Static Configuration Operation
When all of the previous operations are complete and successful, the RM
sends the Word Serial command
Identify Commander
to all immediate
Message-Based Servants with bus master capability. At this point, the RM
is ready to bring the system into the Normal Operation sub-state. This is
accomplished by sending the Word Serial query
Begin Normal Operation
to all top-level Commanders and immediate Message-Based Servants.
Dynamic Configuration Operation
If the system is a DC system (meaning that at least one DC device was
found), and the nonvolatile configuration specifies that the RM should
create a hierarchy with DC devices assigned to Logical Address 0, the RM
follows the same steps as previously described in the Static Configuration
Operation section. DC devices are treated as SC devices from this point on.
However, if you want to customize your own DC hierarchy and the
nonvolatile configuration specifies that the RM not finish configuring the
hierarchy, the GPIB-VXI/C RM does not send
Identify Commander
or
Begin Normal Operation
to any devices, either static or dynamic.
The outside controller can then create the DC Commander/Servant
hierarchy without having to dynamically reconfigure the system. Use the
GPIB-VXI/C local command
DCGrantDev
to create the DC hierarchy.
When the system is configured and ready to make a transition to the Normal
Operation sub-state, send the GPIB-VXI/C local command
DCBNOSend
.
DCBNOSend
sends the
Identify Commander
and
Begin Normal Operation
commands to Message-Based devices as previously described in the
section. Refer to the
section of Chapter 3,
for more information about dynamic configuration operation.
The GPIB-VXI/C then performs general configuration operations. The
GPIB-VXI/C creates GPIB address links for its immediate Message-Based
