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Here is the instruction show you guide on how to use Deutz SerDia2010 to change constant speed for Deutz EMR3 control unit.

To use this function, the engine has to be in fixspeed mode or the setting allows to activate the fixspeed mode.

Preparations:

Deutz Diagnostic Kit DECOM for Deutz Engine

2023 Deutz Serdia2010 v14.1.9.1 Diagnostic Software Free Download

Deutz Serpic EPC Parts Catalogue 2014 2012 Free Download

The actual setting for the fixspeed values are shown on the left upper part of the screen.
The setting of the switch is marked, too
Additionally the actual engine speed and the speed setpoint is shown as value and tachometer on the right side inclusive hysteresis to have a qualitative feedback.
 

Button "read from ECU":
The original stored values of the ECU were refreshed on the screen. Changes of the values are deleted.
Button "write values to ECU":
Values shown on the screen for fixspeed 2 (first intermediate speed) and fixspeed 3 (2. intermediate speed) are flashed to the ECU.
If the engine is still running while activation of this procedure, SerDia will ask to stop
engine automatically.
The values for fixspeed 1 (low idle) and fixspeed 4 (high idle) cannot be changed free,
because they are linked to low, respectively high idle. Textbox "Constant Speed 2","Constant Speed 3":
 

Changes in these textboxes have to be confirmed with ENTER.
After confirmation the new value will get active, if switched on (see marking point at fixspeed).
It is not possible to install a speed below fixspeed one or above fixspeed four.
The fixspeeds 1 and 4 are not changeable in this screen (see hints above).