Thanks for your reply.
I provisionally picked the LabJack because it looks like a good solution for data logging. I will check out the Linux driver status.
I was hoping to use USB and the choice of a laptop PC was made on grounds of power consumption – a key issue in an off-grid system. I have a core duo HP notebook that consumes a steady 15 watts when active with the screen turned off. That will go up slightly with a LabJack connected but still be far lower than a normal PC – although there are possibilities: http://www.pcmag.com/article2/0,1759,2088992,00.asp
Are there any websites you could recommend to help me get my mind round the hardware issues and possibilities?
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