ALLIED Vision Technologies Guppy PRO F-503 - Manual (Page 263)

Configuration of the camera
Guppy PRO Technical Manual V4.0.0
261
Restrictions Note the restrictions in the following table. When using software with an
Isochronous Resource Manager (IRM): deactivate it.
Operation The maximum allowed isochronous packet size can be set separately for the
ISO speeds S400 and S800. Check the associated Presence_Inq flag to see
for which ISO speed this feature is available.
Setting the Set2Max flag to 1 sets the MaxIsoSize field to the maximum sup-
ported isochronous packet size. Use this flag to query the maximum sup-
ported size (may depend on the camera model).
Enable this feature by setting the ON_OFF flag to 1 and the MaxIsoSize field
to a value greater than the default packet size.
The camera ensures:
• that the value of the MaxIsoSize field is a multiple of 4.
• that the value isn’t lower than the value specified by the IEEE1394
specification.
The settings are stored in the user sets.
Note

We strongly recommend to use PCI-X (64 bit) or PCI Express
adapter.
Software Restrictions
FireGrab Deactivate Isochronous Resource Manager:

SetParameter (FGP_USEIRMFORBW, 0)
FireStack/FireClass No restrictions
SDKs using Microsoft driver
(Active FirePackage,

Direct FirePackage, ...)
n/a
Linux: libdc1394_1.x No restrictions
Linux: libdc1394_2.x Deactivate Isochronous Resource Manager:

Set DC1394_CAPTURE_FLAGS_BANDWIDTH_ALLOC flag to 0
Third Party Software Deactivate Isochronous Resource Manager
Table 142: Restrictions for feature: Maximum ISO packet size
Note

Enabling this feature will not change the MaxBytePerPacket
value automatically. The camera may not use the new
isochronous packet size for the MaxBytePerPacket value
until a write access to the desired Format_7 mode has been
issued.