Lenz Digital plus LH101 Mode D'emploi page 188

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Whenever you enter the number of a CV, a PoM read command is
sent to the decoder which sends the content of the respective CV via
RailCom. The LRC120 address display receives this information and
displays it for approx. 3 seconds.
13.2.6 Setting and deleting bits (switches) using PoM — step by
step approach
Many CVs do not use numeric values, but individual bits (switches) for
particular settings. It is much more comfortable to change a feature by
setting or deleting the corresponding bit (switch) than to calculate the
corresponding numeric value and to programme it into the CV (which
is, of course, also possible).
A particularly good example for a CV for which the deleting and setting
of bits is the better approach is CV29.
In the following example we will change CV29 in locomotive address 3
using PoM.
Action Display
Call up the locomotive whose settings you
want to change using PoM.
Press the 'locomotive' key.
Press the 'M' key. You are offered the option
last used (in this example the setting of the
speed step mode).
Turn the rotary knob until "Programmieren
während des Betriebs PoM/Programming in
operational mode PoM" is displayed.
Press the rotary knob to select the option
"PoM". You are asked to enter the CV that
you want to change using PoM.
Operating manual LH101
Explanation