User`s manual

Basic Operation & Standard Features
3-12
BASLER A600f
DRAFT
3.2.6 Recommended Method for Controlling Exposure Start
If a camera user requires close control of exposure start, there are several general guidelines that
must be followed:
• The camera should be placed in continuous shot mode.
• The user must use an external trigger (ExTrig) signal to start exposure.
• The user must monitor the trigger ready (TrigRdy) signal.
• A rising edge of the ExTrig signal must only occur when the TrigRdy signal is high.
Assuming that these general guidelines are followed, the reaction of the camera to a rising
external trigger signal will be as shown in Figure 3-6:
• The start of exposure will typically occur 22 µs after the rise of the ExTrig signal.
• The integrate enabled (IntEn) signal will rise between 5 and 20 µs after the start of exposure.
• The actual length of exposure will be equal to the programmed exposure time.
• The IntEn signal will fall between 30 and 100 µs after the end of exposure.
Figure 3-6: Exposure Start Controlled with an ExTrig Signal
1
Frame Transfer Time = [ (AOI Height + 2) x 15.28 µs ] + 15.28 µs
2
Frame Transmission Time = Packets/frame x 125 µs
3
If the transmission time is greater than the transfer time:
Start Delay = 125 µs.
If the transmission time is less than the transfer time:
Start Delay = (Transfer Time - Transmission Time) + 125 µs
L
The camera can be programmed to begin exposure on a rising edge or on a falling
edge of an ExTrig signal. Also, two modes of exposure control are available: pro-
grammable and level controlled (see Section 3.2.5). For this illustration, we are as-
suming that a rising edge trigger and the programmable exposure mode are used.
TrigRdy
ExTrig
Exposure
IntEn
Frame
Transfer
~22 µs
Frame N Transfer to the Image Buffer
1
Exposure
Frame N
Exposure
Frame N + 1
Exposure
Frame N + 2
Frame N + 1 Transfer to the Image Buffer
1
TIMING CHARTS ARE NOT DRAWN TO SCALE
30 µs
100 µs
5 µs
20 µs
~ 22 µs
5 µs
20 µs
30 µs
100 µs
Frame
TransMission
Frame N Transmission to the PC
2
Frame N + 1 Transmission to the PC
2
Transmission Start Delay
3
Transmission Start Delay
3