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???
11/27/07 08:31
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 		 #147446 - Standard
Responding to: ???'s previous message
Richard Erlacher said:
A dead short to either rail, if supplied by the MAX232 wouldn't damage anything. A dead short to GND wouldn't either.

The RS232 standard specifically requires this - also that connecting two driver outputs together won't cause damage.

So I agree: a properly implemented MAX232 circuit should not cause any of the problems described.

Possibilities are, then:

  • The MAX232 circuit is not properly implemented (whether by accident or design);

  • The MAX232 is being damaged by something else;

  • Power supply (eg, grounding) issues are causing the problems;

  • etc?




    • 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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