Exposure Control; Setting The Exposure Time; Controlling Exposure Start Via The 1394 Interface - Basler A101f User Manual

3.2 Exposure Control

3.2.1 Setting the Exposure Time

Exposure time is determined by the value stored in the SHUTTER control register. The value in
the register can range from 0 to 4095 (0x000 to 0xFFF). The value in the register represents n in
the equation: Exposure Time = (n + 1) x 20 µs. So, for example, if the value stored in the
SHUTTER register is 100 (0x064), the exposure time will be (100 + 1) x 20 µs or 2020 µs.

3.2.2 Controlling Exposure Start via the 1394 Interface

One-Shot Operation
In one-shot operation, the camera exposes and transmits a single frame. Exposure begins when
the ONE_SHOT control register is set to 1. Exposure time is determined by the value stored in the
SHUTTER control register (see Section 3.2.1).
The ONE_SHOT control register is self cleared when transmission of frame data begins.
See Section 4.2, Register Write Order, for a complete description of the order in
which the camera registers must be written. This applies for one-shot, multi-shot, and
continuous-shot operation.
Multi-Shot Operation
In multi-shot operation, the camera exposes and transmits multiple frames. The exposure for the
first frame begins when the MULTI_SHOT control register is set to 1. The number of frames that
will be transmitted is determined by the value stored in the COUNT_NUMBER field of the control
register. The exposure time for each frame is determined by the value stored in the SHUTTER
control register (see Section 3.2.1). The start of exposure on the second and subsequent frames
is automatically controlled by the camera.
If the camera is operating in video Format 0, Format 1, or Format 2, the rate at which frames will
be captured and transmitted is determined by the value stored in the CUR_V_FRM_RATE /
REVISION control register.
If the camera is operating in video Format 7, the rate at which frames will be captured and
transmitted is determined by the value stored in the BYTE_PER_PACKET control register (see
Section 3.12.2).
The MULTI_Shot control register is self cleared when transmission of the last frame begins.
Continuous-Shot Operation
In continuous-shot operation, the camera continuously exposes and transmits frames. The
exposure of the first frame begins when the ISO_EN/CONTINUOUS_SHOT control register is set
to 1. The exposure time for each frame is determined by the value stored in the SHUTTER control
register (see Section 3.2.1). The start of exposure on the second and subsequent frames is
automatically controlled by the camera.
If the camera is operating in video Format 0, Format 1, or Format 2, the rate at which frames will
be captured and transmitted is determined by the value stored in the CUR_V_FRM_RATE /
REVISION control register.
f
BASLER A101
DRAFT
Operation and Features
3-3