Red Lion TCU - Manual (Page 23)

Configuration Of Parameters
As supplied from the factory, the controller parameters have been
programmed to the values listed in the Programming Quick Reference
Tables . The user must modify the values, if necessary, to suit the application.
Operation and configuration of the controller is divided into five distinct
operational/programming modes to simplify the operation of the controller:
Normal Display Mode, Unprotected Parameter Mode, Protected Parameter
Mode, Hidden Function Mode, and Configuration Parameter Modules. See
Figure 12, Operational/Programming Modes.
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Figure 12, Operational/Programming Modes