User`s manual

Configuring the Camera
Basler sprint Mono Cameras 165
Setting the Absolute Gain
If you set the gain by writing a value to the Absolute Gain field of the Gain CSR, you can write a
floating point value from -12.04 to +12.04 (decimal) in increments of 0.01. Writing a floating point
value to the absolute register sets the gain directly in dB. For example, if the absolute gain field is
set to 3.42, then the camera would be set for 3.42 dB of gain.
Note
You do not need to set both the raw field and the absolute field. Setting just
one of the fields is sufficient and you can choose to set whichever field best
suits your needs.