ALLIED Vision Technologies Marlin F-201 - Manual (Page 208)

Configuration of the camera
MARLIN Technical Manual V2.4.0
208
Time base
Corresponding to IIDC, exposure time is set via a 12-bit value in the corre-
sponding register (SHUTTER_INQ [51Ch] and SHUTTER [81Ch]).
This means that a value in the range of 1 to 4095 can be entered.
Marlin cameras use a time-base which is multiplied by the shutter register
value. This multiplier is configured as the time base via the TIMEBASE regis-
ter.
The time base IDs 0-9 are in bits 28 to 31. See Table 103: Timebase ID on
page 209. Refer to the following table for code.
Default time-base is 20 µs: This means that the integration time can be
changed in 20 µs increments with the shutter control.
The ExpOffset field specifies the camera specific exposure time offset in
microseconds (µs). This time (which should be equivalent to
Table 43: Cam-
era-specific minimum exposure time on page 121) has to be added to the
exposure time (set by any shutter register) to compute the real exposure
time.
The ExpOffset field might be zero for some cameras: this has to be assumed
as an unknown exposure time offset (according to former software versions).
Register Name Field Bit Description
0xF1000208 TIMEBASE Presence_Inq [0] Indicates presence of this
feature (read only)
--- [1..27] Reserved
Timebase_ID [28..31] See Table 103: Timebase ID
on page 209
Table 102: Advanced register: Time base
Note
L
Time base can only be changed when the camera is in idle
state and becomes active only after setting the shutter value.