Input Signals; Exsync: Controls Frame Readout And Exposure Time; Exflash From The Frame Grabber - Basler A400K User Manual

Camera Interface

2.4 Input Signals

The A400k receives the RS-644 input signals ExSync, ExFlash, and SerTC ("Serial to Camera")
of the serial interface. Section 2.4.1 describes the function of the ExSync signal, Section 2.4.2
describes the function of the ExFlash signal. SerTC of the serial communication is described in
Section 2.6.

2.4.1 ExSync: Controls Frame Readout and Exposure Time

The ExSync input signal is used to control exposure and readout of the A400k. ExSync is an LVDS
signal as specified for RS-644. The ExSync input corresponds to the camera control signal CC1
as defined in the Camera Link standard. CC2 and CC4 are not used in this camera.
The camera can be programmed to function under the control of an externally generated sync
signal (ExSync) in two exposure time control modes. In these modes, level-controlled and
programmable, the ExSync signal is used to control exposure time and frame read out. For more
detailed information on the two modes, see Section 3.3.
ExSync can be a periodic or non-periodic function. The frequency of the ExSync signal
determines the camera's frame rate in these modes.
Note that ExSync is edge sensitive and therefore must toggle.
In ExSync edge-controlled mode and programmable mode, minimum high time for the ExSync
signal is 250 ns, minimum low time is also 250 ns. In ExSync level-controlled mode, minimum high
time for the ExSync signal is 9.12 µs, minimum low time is 4.56 µs.
The ExSync signal is typically supplied to the camera by a frame grabber board. Refer to the
manual supplied with your frame grabber to determine how to set up the ExSync signal.

2.4.2 ExFlash from the Frame Grabber

The first Camera Link contains an LVDS input for the ExFlash signal. With the corresponding
register setting, this input can be tied to the output signal of the flash trigger connector. The
ExFlash signal is not used by the camera itself. The ExFlash input corresponds to the camera
control signal CC3 as defined in the Camera Link standard.
The minimum pulse width of ExFlash is 1 µs, there are no further restrictions.
2-12
DRAFT
Maximum frame rate =
1
--------------------------------------------------------------------------------- -
Minimum ExSync signal period
Basler A400k