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???
09/26/09 15:57
Modified:
  09/26/09 16:03
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 		 #169169 - the longest reply ever
Responding to: ???'s previous message
Tony Gelonese's method might have worked OK in the field; but this is not the perfect solution. This solution will work on xxxx type of CPUs, but not as presented - list about 2000 chips
but will NOT work on YYYY type of CPUs list about 1000
and the reason being that YYYY chips convert TxD/RxD into Strong pull ups when used as UARTS, but in XXXX chips this is not so, hence Tony Gelonese's method will work on XXXX chips. but not as Tony states
If you want to implement this scheme on YYYY chips, then you can use the above schematic, can't comment on an incomplete schematic, always check in preview
but the protocol has to be such that there is NO Bus-contention (2 transmitters on the network at any given moment of time). which was the very question posted to Tony

Erik



List of 71 messages in thread
TopicAuthorDate
Communication between two 8051            01/01/70 00:00      
   I'm going to recommend            01/01/70 00:00      
      I'm going to recommend            01/01/70 00:00      
   I'd recommend ...            01/01/70 00:00      
      irrelevant, however            01/01/70 00:00      
      chip            01/01/70 00:00      
         multiple chips ....            01/01/70 00:00      
            Perhaps you don't need two UARTs            01/01/70 00:00      
   Side note, multiple COM ports            01/01/70 00:00      
      FTDI Multi-UART to USB            01/01/70 00:00      
   Clarify?            01/01/70 00:00      
   Parallel 8051 TXs and RXs            01/01/70 00:00      
      Two transmitters            01/01/70 00:00      
         Which lesson to give?            01/01/70 00:00      
            and ..            01/01/70 00:00      
            Like good little children            01/01/70 00:00      
            Jimmy Neutron/Phineas & Ferb            01/01/70 00:00      
            Tony Gelonese's method should work...            01/01/70 00:00      
               no, and yes            01/01/70 00:00      
         some more thought...Per Westermark            01/01/70 00:00      
            It is all in the subpressed details            01/01/70 00:00      
               SIlabs chips would burn            01/01/70 00:00      
      No, That won't "just work"            01/01/70 00:00      
         I think there's more to this than meets the eye            01/01/70 00:00      
            Not always interrupt response instantly            01/01/70 00:00      
               Since the O/P hasn't been back ...            01/01/70 00:00      
                  serial communication            01/01/70 00:00      
                     you are aware?            01/01/70 00:00      
                        You are also aware?            01/01/70 00:00      
                     Synchronize transfers            01/01/70 00:00      
                        Connecting two TX outputs            01/01/70 00:00      
                     Unnecessary complication!            01/01/70 00:00      
                        Different name            01/01/70 00:00      
                        Walter and Walter            01/01/70 00:00      
                           Name            01/01/70 00:00      
                              what are you ashamed/afraid/... of            01/01/70 00:00      
                              Walter, Please eschew obfuscation and equivocation            01/01/70 00:00      
                     That Phytec Board has RS485 and I2C and SPI            01/01/70 00:00      
                        summarizing            01/01/70 00:00      
                           to a nail everything looks like a hammer            01/01/70 00:00      
                        actually ... he hasn't said he needs that ...            01/01/70 00:00      
                           Often important information arrives quite late            01/01/70 00:00      
                           Actually, he did!            01/01/70 00:00      
                              It's not complete            01/01/70 00:00      
                                 he's so stingy with information            01/01/70 00:00      
   Some more Thought....            01/01/70 00:00      
      This assumes perfect synchronization            01/01/70 00:00      
      the longest reply ever            01/01/70 00:00      
         Schematic is Incomplete            01/01/70 00:00      
      Missing boundary limits            01/01/70 00:00      
         Use p3.0 and p3.1            01/01/70 00:00      
            huh?            01/01/70 00:00      
            You need to clarify your requirement!            01/01/70 00:00      
            This contradicts an earlier post from you            01/01/70 00:00      
               agree with most, but???            01/01/70 00:00      
                  clock-for-clock send            01/01/70 00:00      
                     Still not clear!            01/01/70 00:00      
                        I think you lost the thread            01/01/70 00:00      
                           If they're to remain in precise synchronization ...            01/01/70 00:00      
                              Ridiculous            01/01/70 00:00      
                                 Come on, Walter!            01/01/70 00:00      
                                 It's routinely done ...            01/01/70 00:00      
                                    Don't relive your past again and again            01/01/70 00:00      
                                       MCU is a component, not a computer system.            01/01/70 00:00      
                                          Tell me more about femtosecond precision            01/01/70 00:00      
                                             not even then            01/01/70 00:00      
                                                Watch out            01/01/70 00:00      
                                                   Some suggestions for low-jitter processor activation            01/01/70 00:00      
                                                That's exactly what it is            01/01/70 00:00      
                  The two slaves must be in the same state            01/01/70 00:00      
            Is this yet another problem?            01/01/70 00:00      

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