Yokogawa FieldMate - Manual (Page 278)

<I ISA100 device configuration>
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IM 01R01A01-01E 9th Edition : May 31, 2013-00
When any number of HART adaptors is indicated with the “Model”, HART (adaptor) in the tree
menu of Segment Viewer will become enabled.
The model corresponding to HART adaptor is OWA_HART only.
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Figure I-3-4 Enabling/Disabling HART (adaptor) in the Tree Menu