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Instructions for updating the YAC appear earlier in this document.
For more details regarding dictionary and substitution files see: Manual Generation of EPICS PVs from YAML Config Files
The dictionary file is installed in the ${TOP}/yaml directory. In in IOC startup script st.cmd, the 8th argument of YCPSWASYNConfig() specifies the dictionary path.
For example, "yaml/bcm_01_20170313140632.dict".
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