Instruction manual

Guppy PRO Technical ManualV4.1.0
32
FireWire
FireWire hot-plug and screw-lock precautions
Caution

Hot-plug precautions
• Although FireWire devices can theoretically be hot-
plugged without powering down equipment, we strongly
recommend turning off the computer power, before
connecting a digital camera to it.
• Static electricity or slight plug misalignment during
insertion may short-circuit and damage components.
• The physical ports may be damaged by excessive ESD
(electrostatic discharge), when connected under powered
conditions. It is good practice to ensure proper grounding
of computer case and camera case to the same ground
potential, before plugging the camera cable into the port
of the computer. This ensures that no excessive difference
of electrical potential exists between computer and cam-
era.
• As mentioned earlier, it is very important not to exceed
the inrush energy of 18 mWs in 3 ms. (This means that a
device, when powered via 12 V bus power, must never
draw more than 1.5 A, especially in the first 3 ms.)
• Higher inrush current may damage the physical inter-
face chip of the camera and/or the phy chip in your PC.
For a single Stingray camera inrush current may not be a
problem. But daisy chaining multiple cameras or supply-
ing bus power via (optional) HIROSE power out to cir-
cuitry with unknown inrush currents needs careful design
considerations.
Screw-lock precautions
• All Allied Vision 1394b camera and cables have industrial
screw-lock fasteners to insure a tight electrical connec-
tion that is resistant to vibration and gravity.
• We strongly recommend using only 1394b adapter cards
with screw-locks.