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???
06/04/09 20:52
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 		 #165859 - there is always SOME coupling...
Responding to: ???'s previous message
... at least the optos do have significant capacitance (pF or tens of pF) - so that spikes etc. make it through definitively.

You want your USB side grounded properly. Note, that some PCs don't ground properly the USB shield, that's fatal if you fail to do so. In case of a surge, the coupled charge wants to flow in some direction, and you have to make sure, that it's not the data lines.

JW

List of 30 messages in thread
TopicAuthorDate
FT232R USB to Serial            01/01/70 00:00      
   Something silly ?            01/01/70 00:00      
      Capacitive Coupling            01/01/70 00:00      
         Ideas            01/01/70 00:00      
         there is always SOME coupling...            01/01/70 00:00      
   crash and reset the USB connection            01/01/70 00:00      
      Very unlikely            01/01/70 00:00      
         PC USB crash            01/01/70 00:00      
            Isolated hub?            01/01/70 00:00      
         PC Isolation?            01/01/70 00:00      
   just blame the chip.            01/01/70 00:00      
      Please see my other post with image (nt)            01/01/70 00:00      
   is connector grounded on Your side?            01/01/70 00:00      
      Huh?            01/01/70 00:00      
         yes            01/01/70 00:00      
            Floating the end of the cable shielding            01/01/70 00:00      
      Was using wrong cable            01/01/70 00:00      
   More information            01/01/70 00:00      
      Hmm            01/01/70 00:00      
      isolation            01/01/70 00:00      
   Update...            01/01/70 00:00      
      USB and RS485            01/01/70 00:00      
         could this be it            01/01/70 00:00      
            Tested both self-powered and bus-powered            01/01/70 00:00      
         RS485 Converter            01/01/70 00:00      
      el.circui?            01/01/70 00:00      
      re: why?            01/01/70 00:00      
         USB 1.1            01/01/70 00:00      
            re: USB 1.1            01/01/70 00:00      
               popular culture            01/01/70 00:00      

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