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Firewire-B cable with built-in trigger lines?

Hi all,

 

We are building multiple vision systems.  Each system has a camera with Firewire-b cable and also a Trigger Cable (with 3 conductors).

 

For our application, we need as few cables as possible.  Our users are very concerned about having too many cables. 

 

Does anyone know if I can purchase a firewire-B cable that has trigger lines.  Some kind of two-in-one cable?

 

Our best option right now is to use spiral wrap.

 

- John

http://www.medicollector.com
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You may be able to have an outfit like Components Express create a custom firewire cable for you, see http://www.ceicables.com/.

Robert Eastlund
Graftek Imaging, Inc.
Phone: (512) 416-1099 x101
Email: eastlund@graftek.com
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Out of curiousity, what is sending the trigger signals and what sort of latency/jitter requirements are acceptable for your application? It is possible you may be able to send the trigger in-band along the FireWire cable if your requirements are loose enough. You may have already considered this and discounted it, but I wanted to check just in case...


Eric

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The signal is being generated by an NI DAQ card:

Pin 1: +5V
Pin 2: DGND
Pin 3: A digital pulse train that fires the camera shutter. From 0.25 Hz to up to 60 Hz.

Not really sure about jitter or latency. I'd rather not have much of either. But don't have specific requirements.

How can I put the signal "in band" with the FireWire cable? Are there unused pins I could utitilize? Not sure if it'd be worth the effort, but I am curious.

Thanks! This machine vision board is very helpful!
http://www.medicollector.com
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