Guppy PRO Technical Manual
V4.1.2
220
Time base
Corresponding to IIDC, exposure time is set via a 12-bit value in the
corresponding register (SHUTTER_INQ [51Ch] and SHUTTER [81Ch]).
This means that you can enter a value in the range of 1 to 4095.
Guppy PRO 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 bit [28] to [31]. See
page 221. 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
) 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
0xF1000200
MAX_RESOLUTION MaxWidth
[0 to 15] Sensor width
(read only)
MaxHeight
[16 to 31] Sensor height
(read only)
Table 126: Advanced register: Maximum resolution inquiry
Register
Name
Field
Bit
Description
0xF1000208
TIMEBASE
Presence_Inq
[0]
Indicates presence of this
feature (read only)
---
[1 to 7]
Reserved
ExpOffset
[8 to 19] Exposure offset in µs
---
[20 to 27] Reserved
Timebase_ID
[28 to 31] See
Table 127: 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.
