Basic Operation and Features3-20 Basler A500kPRELIMINARY3.3.3.1 ExSync, Programmable Mode with Asynchronous TimingFigure 3-16: ExSync, Programmable Mode - Exposure Start and Stop with Frame Valid LowThe effective exposure occurs while the Frame Valid signal is low. The FlashOut signal is set tohigh while the effective exposure occurs. The start, stop, and duration of the effective exposureare defined in the following ways (see Figure 3-16):• The effective exposure starts d microseconds after the rise of the ExSync signal (exposurestart delay).• Disregarding possible jitter, the duration of the effective exposure is defined by period p (setby Timer 1).• Jitter (f) may shorten the effective exposure, i.e. duration of the effective exposure = p - f .Due to the propagation time of approximately 1 μs, ExSync can go high up to 1 μs before theFrame Valid signal goes low.A504k/kc A503k A501k/kcp Exposure as set by Timer 1d 1.7 μs 1.7 μs 7.2 μsf 0 μs 0 μs ≤ 5.5 μsExSync p = Timer 1ExSync Period4.7 μs (A504k/kc)5.5 μs (A503k)26.4 μs (A501k/kc)FrameValidLineValidd = 1.7 μs (A504k/kc)d = 1.7 μs (A503k)d = 7.2 μs (A501k/kc)IntegrateEnabled f = 0 μs (A504k/kc)f = 0 μs (A503k)f = ≤ 5.5 μs (A501k/kc)p = Timer 1TIMING CHARTS ARE NOT DRAWN TO SCALE
