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???
11/27/07 13:36
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 		 #147449 - why??
Responding to: ???'s previous message
try the circuit with opto coupler on rx and tx and apply
why? it is far easier to grab an isolated RS232 transceiver, virtually every analog supplier has them. Some of those can handle quite high voltage differences.

Erik

List of 60 messages in thread
TopicAuthorDate
PC COM Ports Damaging !!!            01/01/70 00:00      
   Earth loops?            01/01/70 00:00      
      Why Now and this circuit ?            01/01/70 00:00      
   Damage?            01/01/70 00:00      
      I am Sure ...            01/01/70 00:00      
   Common mode            01/01/70 00:00      
      You haven't mentioned            01/01/70 00:00      
   do you have the shell of DB9 grounded?            01/01/70 00:00      
   Serial port damage            01/01/70 00:00      
      for serial port damage            01/01/70 00:00      
         No            01/01/70 00:00      
      No, that can't be right!            01/01/70 00:00      
         re:3.3V            01/01/70 00:00      
            are you sure about that, Andy?            01/01/70 00:00      
   Are You SURE?            01/01/70 00:00      
      I'm sure Dear ...            01/01/70 00:00      
         not to be argumentative ... but ...            01/01/70 00:00      
   check it            01/01/70 00:00      
      Checks            01/01/70 00:00      
         We haven't seen how the DB-9 is wired            01/01/70 00:00      
            It\'s probably not a DB-9!            01/01/70 00:00      
               sure, but            01/01/70 00:00      
               Sloppy terminology            01/01/70 00:00      
   My Burned out ports            01/01/70 00:00      
      What?            01/01/70 00:00      
         What I mean is            01/01/70 00:00      
   a common misunderstanding is            01/01/70 00:00      
      So problem is in "modern" PCs?!            01/01/70 00:00      
      So problem is in "modern" PCs?!            01/01/70 00:00      
         maybe i'm wrong            01/01/70 00:00      
   try with opto coupler and +9 volt supply            01/01/70 00:00      
      Back when folks cared whether things work ...            01/01/70 00:00      
      Assuming He does not have one            01/01/70 00:00      
         There is a way to be sure.            01/01/70 00:00      
            Standard            01/01/70 00:00      
               Power Supply ...            01/01/70 00:00      
                  Dwhatever9 shell connection to GND...            01/01/70 00:00      
                     about that shell-to-shell connection            01/01/70 00:00      
                        generally...            01/01/70 00:00      
                  Truth emerges            01/01/70 00:00      
                     developed?            01/01/70 00:00      
                  that\'s the problem!            01/01/70 00:00      
         HUH?            01/01/70 00:00      
      why??            01/01/70 00:00      
         Broken COM port suggestions            01/01/70 00:00      
            he is not wrong - if            01/01/70 00:00      
               ...he is not wrong... only said watch it            01/01/70 00:00      
                  BULL!!!            01/01/70 00:00      
                     Bull?            01/01/70 00:00      
                        yes, genuine male cow manure            01/01/70 00:00      
                           Eric, you are a sad man            01/01/70 00:00      
                           Amateurs and pros            01/01/70 00:00      
                              of course I do            01/01/70 00:00      
                     Well, it has to do...            01/01/70 00:00      
                        Kai, I now you know this stuff ... but            01/01/70 00:00      
                           Different CMOS design?            01/01/70 00:00      
   that's right, when you can not argue tha facts ...            01/01/70 00:00      
      My Dear Friends ...            01/01/70 00:00      
         look in the datasheet            01/01/70 00:00      
            Y E S . . .            01/01/70 00:00      

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