On Monday, May 20, 2013 4:05:12 PM UTC-7, Josh W. Perfetto wrote:
Ashley, the plan is to provide a very low-cost unit, ....
very friendly software accessible
via wifi/ethernet/touch screen.
Low-cost is not synonymous with providing these expensive system components (wifi/ethernet/touch screen). Don't even mention using likewise expensive & underwhelming arduino. $10 here, $10 there, it all adds up and is not very low cost. USB is a better bet, serial still the cheapest and simplest. For an automation system, a better bet is industrial grade wired bus with longer distance. Lab equipment typically doesn't move or alternatively if it's a field unit, it is plugged into a computer after logging data internally.
Here's typical options for low cost communication. It's probably better to have independent power rather than run power through the communication link.
RS-232 - UART framed, single ended, full duplex, non shared media, NRZ, up to a few hundred feet, non powered, non isolated.
RS423 - UART framed, single ended, full duplex, non shared media, logic level, several hundred feet, non powered, non isolated.
RS-422 - UART framed, differential, full duplex, non shared media, logic level, up to a thousand feet, non powered, non isolated.
RS485 - UART framed, differential, half duplex, shared media, up to a couple thousand feet, non powered, non isolated.
CAN/Fieldbus - UART framed, differential, half duplex, NRZ, powered, signal can be isolated.
GPIB/IEEE-488 - parallel bus, logic level, short-range, shared media, high bandwidth, ruggedized connectors, very common in tech equipment, more expensive connectors & cabling in comparison to the others.
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