Local Operator Interface (Loi) Controls - Emerson Rosemount OCX8800A Manual

Using the local operator interface (LOI)
December 2022
4.2

Local operator interface (LOI) controls

4.2.1 Overview
The local operator interface (LOI), shown in
fluorescent display. Intensity is adjustable.
There is an infrared light-emitting diode (LED) source and a detector for each key.
The detectors can detect a finger placed above the button through the glass
window. There is no need to open the instrument in bad weather or in hazardous
areas in order to access the electronics.
The transmitter also uses HART
permitting access to all instrument functionality anywhere the digital O
terminates via a Field Communicator. The transmitter also uses HART
communications, permitting access to all instrument functionality anywhere the
4-20 mA signal terminates via a HART Field Communicator.
70
Figure 4-2, uses a bright blue gas-
or F Fieldbus communications,
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