Instruction manual

Prosilica GC Technical Manual V2.1.0

Camera trigger

Trigger rules

•The end of exposure will always trigger the next readout.

•The end of exposure must always end after the current readout.

•The start of exposure must always correspond with the interline time if

readout is true.

• Exposure start delay equals the readout time minus the registered expo-

sure time.

Triggering during the idle state

For applications requiring the shortest possible Trigger Latency and the smallest

possible Trigger Jitter the User Trigger signal should be applied when Imaging is

false and Idle is true. In this case, Trigger Latency and Trigger Jitter are as indi-

cated in the camera specifications section.

Triggering during the readout state

For applications requiring the fastest triggering cycle time whereby the camera

image sensor is exposing and reading out simultaneously, apply the User Trigger

signal as soon as a valid Trigger Ready is detected. In this case, Trigger Latency

and Trigger Jitter can be up to 1 row time since Exposure must always begin on

an Interline boundary.

Trigger ready Indicates to the user that the camera will accept the

next trigger

Registered exposure time Exposure time value currently stored in the camera

memory

Exposure start delay Registered exposure time subtracted from the read-

out time and indicates when the next exposure

cycle can begin such that the exposure will end

after the current readout

Interline time Time between sensor row readout cycles

Imaging High when the camera image sensor is either

exposing and/or reading out data

Idle High if the camera image sensor is not exposing

and/or reading out data

Note



The user trigger pulse width should be at least three times the

width of the trigger latency as indicated in Chapter

Specifications on page 13.

Term Definition

Table 20: Explanation of signals in timing diagram