Guppy PRO Technical Manual
V4.1.2
235
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
supported isochronous packet size. Use this flag to query the maximum
supported 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, to)
n/a
Linux: libdc1394_1.×
No restrictions
Linux: libdc1394_2.×
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.
