Instruction manual
Guppy Technical ManualV7.4.0
247
Configuration of the camera
MinValue and MaxValue limits the range the auto shutter feature is allowed to
use for the regulation process. Both values are initialized with the minimum and
maximum value defined in the standard SHUTTER_INQ register (multiplied by
the current active timebase).
If you change the MinValue and/or MaxValue and the new range exceeds the
range defined by the SHUTTER_INQ register, the standard SHUTTER register will
not show correct shutter values. In this case you should read the EXTEND-
ED_SHUTTER register for the current active shutter time.
Changing the auto shutter range might not affect the regulation, if the regula-
tion is in a stable condition and no other condition affecting the image bright-
ness is changed.
If both auto gain and auto shutter are enabled and if the shutter is at its upper
boundary and gain regulation is in progress, increasing the upper auto shutter
boundary has no effect on auto gain/shutter regulation as long as auto gain reg-
ulation is active.
Auto gain control
The table below illustrates the advanced register for auto gain control.
Note
As with the Extended Shutter the value of MinValue and
MaxValue must not be set to a lower value than the minimum
shutter time.
Register Name Field Bit Description
0xF1000370 AUTOGAIN_CTRL Presence_Inq [0] Indicates presence of this
feature (read only)
--- [1..3] Reserved
MaxValue [4..15] Maximum auto gain value
--- [16..19] Reserved
MinValue [20..31] Minimum auto gain value
Table 118: Advanced register: Auto gain control
Note
• Values can only be changed within the limits of gain CSR.
• Changes in auto exposure register only have an effect
when auto gain is active.
• Auto exposure limits are 50..205.