Feature Modes and Values
55
PixeLINK PL-A780
Document No.: 04646-01
MACHINE VISION CAMERA
SYSTEM GUIDE
Copyright © 2004 PixeLINK
All Rights Reserved
8.2 GPO Modes
The PL-A780 supported GPO modes are defined below. The PL-A780 supports modes 0
(Strobe), 1 (Normal), 3 (Busy) and 4 (Flash Window).
8.2.1 GPO MODE 0 (STROBE)
The GPO is set after a trigger occurs. The GPO pulse is delayed X (GPO Parameter 1)
seconds from the trigger and is Y (GPO Parameter 2) seconds in duration.
8.2.2 GPO Mode 1 (Normal)
The GPO is set to either low or high, depending on the value of Polarity.
8.2.3 GPO Mode 3 (Busy)
The GPO is set whenever the camera is unable to respond to a trigger. This is only useful
when using Trigger Type Hardware or Software, for all other modes it will always be set. The
busy period is defined as the period from the time a trigger is detected until the captured
frame has been read out and any internal housekeeping is completed. This mode can be
used to detect missed triggers. There are no parameters.
8.2.4 GPO Mode 4 (Flash Window)
In this mode, the GPO indicates the window in which a strobe light source may be fired. The
GPO signal will be set once the sensor has completed the reset and starts integrating and will
be deactivated at the end of the exposure time as readout of the array commences. There
are no parameters. For best results, the strobe flash duration plus any delay from the flash
window pulse to the start of the strobe flash should be less than the exposure (Shutter) time.
External
Trigger
Input
GPO Output
X Seconds
Y Seconds
