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Spyder3 GigE Vision SG-14 Monochrome Cameras User’s Manual 33

Teledyne DALSA 03-032-20123-01

Timing: Exposure and Synchronization

Image exposures are initiated by an event. The trigger event is either the camera's programmable internal

clock used in free running mode, an external input used for synchronizing exposures to external triggers,

or a programmed function call message by the controlling computer.

Trigger commands are available as members of the Sensor Control set.

GigE Vision Input Controls

Line Trigger

Trigger Mode

The state of the line trigger. If OFF, then the line trigger is

internally generated. If ON, then triggered by an external

signal.

Trigger Source

The external source that causes a line trigger. The line

trigger is from the GPIO_PIN0. This feature is available

only when Line Trigger Mode is set to ON.

Trigger Activation

Determines the type of signal (high or low) that will cause

a line trigger. Line Trigger Mode must be ON.

External Line Trigger Frequency

Reads the external line trigger frequency. NOTE: The

camera cannot detect frequency less than 5 Hz and will

display 1 if it cannot detect a signal. This feature is

available when the Line Trigger Mode is set o ON and

Sensor Direction Control is set to External.

The three trigger modes are described here:

Free running (trigger disabled)

The camera free-running mode has a programmable internal timer for line rate and a programmable

exposure period. Line rate is 0.1 fps to the maximum supported by the sensor. Exposures range from the

sensor minimum to a maximum also dependent on the current line rate. This always uses Synchronous

mode where exposure is aligned to the sensor horizontal line timing.

External trigger

Exposures are controlled by an external trigger signal. External signals are isolated by an opto-coupler

input with a time programmable debounce circuit. The following section provides information on

external trigger timing.

Software trigger

An exposure trigger is sent as a control command via the network connection. Software triggers can not

be considered time accurate due to network latency and sequential command jitter. But a software trigger

is more responsive than calling a single-line acquisition (Snap command) since the latter must validate

the acquisition parameters and modify on-board buffer allocation if the buffer size has changed since the

last acquisition.

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Dalsa Spyder3 Manual de usuario Pagina 33