How to Use USB Safely in the M2M Environment
USB is invaluable, but it reveals some serious weaknesses when you take it out of the safe home/office environment and use it in real world applications. USB is very susceptible to ground loops, electromagnetic interference (EMI), and electrostatic discharges (ESD). Its effective range is just five meters; 30 meters if you add USB hubs. Standard USB ports don’t grip cables firmly, and if they wiggle loose it can cause data loss and even arcing. And USB was not designed to communicate with devices that employ older data communications protocols.
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