parameters in the GY502 hidden menu you will find the FMod which is a
standard function in the GY601 mode and the PlsW which lets you use
an S9251 narrow pulse servo with the GY502. However, the gyro remains
a GY502 until the extra components are added on the PCB and the gyro
is "told" that it is a GY601. Then a "RESET" via the hidden menu
loads all the configuration parameters for the GY601. After this the
gyro will greet the user with *GY601* on the display and the menu
will be a normal GY601 menu.

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