Storing UDCs
Most UDCs are stored in one of two tables in the Table Reference Service (TRS): ~UDCALL and ~UDCCAT. You can add, edit, or delete UDCs directly in the TRS using CygNet Explorer. The Device Definition Service (DDS) also includes an interface for adding, editing, and deleting UDCs.
Note: System-generated UDCs do not automatically generate in the TRS. If you want these to appear in the TRS, you must manually add them to it.
For information about how to import and export the contents of a TRS, see CygNet TRS Import/Export Utility. This administrative utility is useful if you plan to make bulk changes to UDCs.
~UDCALL Table (UDC All)
This table contains all UDC names and descriptions that have been added to the system with the exception of non-added system-generated UDCs.
Example
Table Entry in this example lists names of actual UDCs.
| Table Name | Table Entry | Entry Description |
|---|---|---|
| ~UDCALL | PDIFF | Diff Pressure |
| ~UDCALL | TBOARD | Board Temperature |
| ~UDCALL | TGAS | Gas Temperature |
~UDCCAT Table (UDC Category)
Categories of UDCs are stored in the ~UDCCAT table in two formats. UDCs do not have to be assigned to a category, but categories ease searching. A UDC can belong to more than one category.
Example
The first format lists ~UDCCAT as its Table Name, followed by a specific class of category in the Table Entry column.
| Table Name | Table Entry | Entry Description |
|---|---|---|
| ~UDCCAT | ~UDCLEVL | Level |
| ~UDCCAT | ~UDCPRSS | Pressure |
| ~UDCCAT | ~UDCTEMP | Temperature |
Example
The second format lists the specific class of category as its Table Name, followed by a specific instance of that class in the Table Entry column. Table entries here are UDCs that have been added to a category.
| Table Name | Table Entry | Entry Description |
|---|---|---|
| ~UDCTEMP | TBOARD | <unused> |
| ~UDCTEMP | TGAS | <unused> |
| ~UDCPRSS | PAIR | <unused> |
| ~UDCPRSS | PDIFF | <unused> |
