ALLIED Vision Technologies AVT GigE Vision Cameras - Manual (Page 51)

AVT GigE Cameras Installation Manual V1.0.1
51
Troubleshooting
• Linux only: Run as root, allowing the OS to boost the priority of the AVT
driver thread, and the driver to bind directly to the NIC adapter. Users who
feel running as root compromises their system security may find the fol-
lowing implementation satisfactory:
– Set the executable owner as root
– Set the “setuid” permission bit on the executable
– In code, when application starts use capset() to release all but these
privileges: CAP_SYS_NICE, CAP_NET_ADMIN, CAP_NET_BROADCAST,
CAP_NET_RAW. The application will start with all root privileges, but it
will drop them immediately after startup
Troubleshooting for Bigeye G cameras only (IOD mode)
If the camera can be detected but no images can be grabbed:
Verify the camera operation mode: Make sure the camera operates in
continuous mode, and not in IOD mode.
General description:
• Continuous mode: The camera generates the images with a constant
exposure time autonomously.
• Image on Demand (IOD): the camera produces no image until a trigger
impulse is generated.
Controls 
IODMode Controls  Exposure 
ExposureAuto/ExposureMode Trigger mode Description
Continuous Off/Manual Freerun Camera generates images with a con-
stant exposure time autonomously. The
exposure time cannot be adjusted.
Continuous Off/Manual LineX/SyncInX Camera waits for an impulse at the
selected trigger input pin to start a
continuous image output.
IOD Off/Manual Freerun Camera produces images autonomously.
The exposure time can be adjusted.
IOD Off/Manual LineX/SyncInX Camera produces a single image for
every impulse at the selected trigger
input pin. The exposure time is defined
by ExposureTimeAbs/ExposureValue.
IOD Other/External LineX/SyncInX Camera produces a single image for
every impulse at the selected trigger
input pin. The pulse width defines the
exposure time.
Table 5: Comparison of IOD modes and trigger modes