Instruction manual

Marlin Technical ManualV.2.7.0

202

Configuration of the camera

Time base

Corresponding to IIDC, exposure time is set via a 12-bit value in the correspond-

ing 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 register.

The time base IDs 0-9 are in bits 28 to 31. See Table 102: Timebase ID on page

202. 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 micro-

seconds (μs). This time (which should be equivalent to Table 68: Camera-specific

exposure time offset on page 145) 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).

0xF1000208 TIMEBASE Presence_Inq [0] Indicates presence of this fea-

ture (read only)

--- [1..27] Reserved

Timebase_ID [28..31] See Table 102: Timebase ID on

page 202

Table 101: Advanced register: Time base

Note



Time base can only be changed when the camera is in idle state

and becomes active only after setting the shutter value.

ID Timebase [μs]

310

4 20 Default value

550

Table 102: Timebase ID