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???
11/21/05 14:10
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 		 #103947 - UART Mode 3
Responding to: ???'s previous message
Charles Bannister said:
How do you avoid the output of the RS232 fighting each other?

Because he's not actually using RS232 - see http://www.8052.com/forum/read.phtml?id=103934
I think this was also the point Erik was trying to make?

I can see how each 89C4051 would act as one unit although three are actually hooked up in parallel if there was another signal telling each one to awaken (at the proper time)

You don't need an extra signal - you can use the UART in Mode 3 (Multiprocessor mode) to address individual slaves.
If your particular 8051-derivative has the enhanced UART, the address detection can all be done in the UART hardware - no software overhead.
(I dunno off-hand if the 89C4051 has this)


List of 55 messages in thread
TopicAuthorDate
Home System            01/01/70 00:00      
   X10 ?            01/01/70 00:00      
   1-Wire?            01/01/70 00:00      
      Multiprocessor communcations            01/01/70 00:00      
   home system            01/01/70 00:00      
   Another Maxim - HomePlug            01/01/70 00:00      
   Simple RS232 multidrop            01/01/70 00:00      
      a dangerous approach            01/01/70 00:00      
         NOT dangerous if you read properly            01/01/70 00:00      
            So it's NOT RS232, then            01/01/70 00:00      
               Ohhh No! ..... Not RS232?            01/01/70 00:00      
                  That you get by with violating the stand            01/01/70 00:00      
                     To RS232 or not to RS232            01/01/70 00:00      
                        well, now you have both            01/01/70 00:00      
                  No Trick            01/01/70 00:00      
                  That's what I said!            01/01/70 00:00      
            dont take it personally            01/01/70 00:00      
               I won't            01/01/70 00:00      
                  on reliability etc.            01/01/70 00:00      
                     true, but...            01/01/70 00:00      
                        time is $$$            01/01/70 00:00      
                           Not bible!            01/01/70 00:00      
                        "bible" - Read, not memorise!            01/01/70 00:00      
                        Jeff, grow some skin!            01/01/70 00:00      
                        Paid help            01/01/70 00:00      
                           I agree            01/01/70 00:00      
                              Oh I am grateful            01/01/70 00:00      
               Indeed            01/01/70 00:00      
                  If this is a "put down" then I must need            01/01/70 00:00      
                     Blah blah blah            01/01/70 00:00      
                        flamewars, episode 3            01/01/70 00:00      
                  Toys !            01/01/70 00:00      
                     slobodan            01/01/70 00:00      
                        Arrogance            01/01/70 00:00      
                           totally misunderstood            01/01/70 00:00      
                              It's here            01/01/70 00:00      
                                 sorry, I do not have ESP            01/01/70 00:00      
                                    How would that help?            01/01/70 00:00      
      Long distances            01/01/70 00:00      
      Questions about your Multi MPU comm.            01/01/70 00:00      
         UART Mode 3            01/01/70 00:00      
            Re: El-cheapo home network            01/01/70 00:00      
               as dangerous and noise prone as the othe            01/01/70 00:00      
                  not "open air"            01/01/70 00:00      
                     well, I missed that, sorry            01/01/70 00:00      
                     ring protection            01/01/70 00:00      
         More info M.I.N.E.S.T.O.N.Y. Comms :-)            01/01/70 00:00      
      You must lead a very quiet life            01/01/70 00:00      
         Don't get personal            01/01/70 00:00      
      may be dangerous            01/01/70 00:00      
         RS485            01/01/70 00:00      
            RS485 addendum            01/01/70 00:00      
               RS485 only specifies the media            01/01/70 00:00      
                  Multiprocessor Mode            01/01/70 00:00      
                     comments/clrafications            01/01/70 00:00      

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