Shutter Speed Vs Frame rate

[Soumya_Mathew]

Hi,

m using 1394 fireware area scan cameras.this camera having a feature as if we r changing the frame rate, the shutter speed range should change. like this, our cameras having some more dependencies.if we r checking the registers inside camera they r updating properly. but if we using the ni drivers ( 1394 imaq>>property node>>atrributes) after chenging the frame rate the shutter speed range is not updating.....means m getting the factory defaults only......

so would u tell me what is the cause for this.... n is there any other possibility to overcome this by using any other vi's provided by NI

thanks,

bannu

[Jeffrey_P]

Good afternoon bannu,

I just want to verify that I am understanding the question properly.  You are saying that your Firewire camera has a built-in feature that alters the range of the shutter speed when the frame rate is updated.  Is that correct?  Furthermore, you can change the shutter speed by changing the frame rate in a different software application.  However, when using the NI-IMAQ for IEEE 1394 driver, the shutter speed is not updated when the frame rate is changed.  Is this a fair summation of the problem that you are facing?

If it is, and I'll assume so for the duration of this single post, then there are VI's included with the NI drivers that allow you to update memory registers on the firewire camera.  This VI is called IMAQ1394 Write Registers.VI.  This VI allows you to modify certain features of firewire cameras that are not included in the standard driver set. 

Also, just a clarification.  Does the range of the shutter speed get updated, or the actual value of the shutter speed.  This is the main clarification that I need.

Please post back if my understanding of the issue is incorrect, or there is part of my explanation that is unclear!

Respectfully,

[Soumya_Mathew]

Good Morning Jeffrey,

Thanks for ur kind reply. ya exactly.m getting the same problem wat u wrote in reply. Here the range of the shutter speed is changing.

Actually my task is i have to create a GUI in Labview Exactly wat measurement and automation explorer is doing.why because in MAX also we not getting updated range of shutterspeed. so our GUI should work for every camera like MAX. here in ur answer u told that using of Write Register n Read register VIs. if we r using these, there meight be change in address locations from camera to camera for that particular feature r for any other feature. is it? So please tell me any other possibility.

If i confused u plz pordon me...

thanks,

Bannu.

[Soumya_Mathew]

m sorry te registers r common for every camera according to IIDC specifications.

tell me any otherway to exceed this........

thanks,

soumya

[Jeffrey_P]

Bannu,

As long as the cameras are DCAM compliant, which they should be in order to function properly with our driver softare, then the specifications dictate that the shutter speed should be in the same memory location.  Certain attributes, such as shutter speed, are common amongst firewire cameras defined by the IIDC/DCAM specifications!  So, you shouldn't have to worry about that!

Respectfully,

[Soumya_Mathew]

Thank you Jeffrey!!!

Regards,

Bannu.