ALLIED Vision Technologies Guppy PRO F-503 - Manual (Page 28)

FireWire
Guppy PRO Technical Manual V4.0.0
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The 1394b capabilities in detail:
• 800 Mbit/s
• All previous benefits of 1394a (see above)
• Interoperability with 1394a devices
• Longer communications distances (up to 500 m using GOF cables)
IIDC V1.31 camera control standards
Twinned with 1394b, the IIDC V1.31 standard arrived in January 2004, evolv-
ing the industry standards for digital imaging communications to include

I/O and RS232 handling, and adding further formats. At such high band-
widths it has become possible to transmit high-resolution images to the PC’s
memory at very high frame rates.
Compatibility between 1394a and 1394b
Compatibility example
It’s possible to run a 1394a and a 1394b camera on the 1394b bus.
You can e.g. run a Guppy PRO F-032B and a Marlin F-033B on the same bus:
• Guppy PRO F-032B @ S800 and 60 fps (2560 bytes per cycle, 32% of the
cycle slot)
• Marlin F-033B @ S400 and 30 fps (1280 bytes, 32% of the cycle slot)
1394a camera connected to 1394b bus
The cable explains dual compatibility: This cable
serves to connect an IEEE 1394a camera with its
six-pin connector to a bilingual port (a port which
can talk in a- or b-language) of a 1394b bus.
In this case the b-bus communicates in a-language
and a-speed with the camera achieving

a-performance
1394b camera connected to 1394a bus
The cable explains dual compatibility: In this case,
the cable connects an IEEE 1394b camera with its
nine-pin connector to a 1394a port.
In this case the b-camera communicates in

a-language with the camera achieving

a-performance
Figure 4: 1394a and 1394b cameras and compatibility
1394b port
1394a camera 1394a port
1394b camera