BioPac - acquisition problems

[ohad]

Hi,

I'm using BIOPAC's MP150 system to acquire some physiological data.
To do this I'm using some methods from "acqserver.py ".

On one of the acquisitions (That includes 6 channels - 2 analog and 4 calculated) I'm reading one of the clculated channel using this command :

bpm = myAcqServer.getMostRecentSampleValue("calc",0).

It works just fine.

When trying to apply the same method to another acquisition (2 analog channels solely), changing the channel type and ID to this method :

bpm = myAcqServer.getMostRecentSampleValue("analog",13)

I'm getting an exception :
" raise ACQServerException(str(exobject))
acqserver.ACQServerException: <Fault 0: 'Unable to get most recent value for channel'>".

In both tries the acquisitions itself (on another computer LAN connected) runs smoothly.

Any idea how should I start troubleshooting?

Thanks!
Ohad