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• Log onto your VMS account
• Gain access to REF_DBSFILES
• Use the tool EDITDBS to edit your database
• If you are changing a seconday that is supertype 1 then you will need to make this change in the corresponding EPICS database. Table 1.0 lists the magent primary secondaries that require changes to both SLC and EPICS databases. Please note that secondaries hightlighted in purple are not used in the LCLS Magnet Controls of new devices but are used in the Magnet controls of existing SLC devices.

Supertype data in the database is organized into large blocks called superblocks or supertypes. Five different supertypes are currently defined:

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Supertypes 0 through 3 are sent to the micro-cluster at IPL. Subsequently only supertype 2 is transmitted to the micro-cluster and only supertype 3 is received from it. (Arbitrary subsets of these blocks may be transmitted as well as the full blocks). The Pointer block was designed as a separate structure to allow it to be write protected and to decrease the overhead associated with moving data. The Stable parameters are usually those that are in the database data files and do not normally change during the operation of the machine. If they are changed, it will be necessary to re-IPL the micros. The block are control parameters for the micro that are loaded by the dbput routines and automatically sent to the relevant micros. The From block is data sent by the micros and is loaded into the database by the DBEX process. Supertype 4 is data associated with a device on a micro but which the micro does not need. Thus it is kept as a separate block to reduce wasted storage in the micro.

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• Verify that you have access to the ACL g-lcls. To check this log onto you Unix account and type the following command on the shell: pts members g-lcls

Cavots
If you are changing a seconday in the SLC database that is supertype 1, you will need to make this change in the corresponding EPICS database as well.

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