1260-00C User Manual
Operation 3-17
Operation
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 (at least one DC device was found),
and the non-volatile configuration specifies the RM should create a
hierarchy with DC devices assigned to Logical Address 0, the RM
follows the same steps as previously described in Static
Configuration Operation . DC devices are treated as SC devices
from this point on.
In order to customize a DC hierarchy and the non-volatile
configuration specifies the RM not finish configuring the hierarchy,
the 1260-00C RM does not send Identify Commander or Begin
Normal Operation to any devices, either static or dynamic. The
outside controller (or EPROMed CI) can create the DC
Commander/Servant hierarchy without having to dynamically
reconfigure the system. Use the 1260-00C 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 1260-00C local command
DCBNOSend
.
DCBNOSend
sends the Identify Commander and Begin Normal
Operation commands to Message-Based devices as previously
described in Static Configuration Operation. See the DC
Commands and Queries section of Section 4 for further
information about dynamic configuration operation.
The 1260-00C performs general configuration operations. The
1260-00C creates GPIB address links for its immediate
Message-Based SC Servants. After this, the 1260-00C RM and
general configuration operations are complete.
GPIB Address
Assignment
The 1260-00C automatically assigns GPIB addresses (primary or
secondary) to itself and to each of its immediate Message-Based
SC Servants. If the Message-Based device does not support
minimal Word Serial[I] or VXIbus 488.2[I4] capabilities, no GPIB
address link is created. The 1260-00C assigns a GPIB address to
each device according to the top five bits of its logical address.
For example, the GPIB address of a device with Logical Address
96 (01100000b) would be 12 (01100b).
If two or more devices have logical addresses with the same top
five bits, the 1260-00C assigns GPIB addresses to devices in
order of the least significant three bits. Conflicting devices are
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