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03/07/07 15:16
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 		 #134488 - As I said, it is not easy to find an example thst
Responding to: ???'s previous message
As I said, it is not easy to find an example thst is simple to explain, but I have had cases of such. I tried to come up with an example that was easy to explain NOT something for you to find a way around.

disabling all interrupts for the time of "measurement" and let the master recover from this
not a good idea. In any serious 485 multinode system, the master will report "node x failed" after n requests without responses.
Actually, here you stumbled on another example of the 2% being 100%. Any serious master will only wait so long for a reply and if the 2% can not be started 100% of the time a "master did not get response" error will occur. This one could be REALLY juicy. Just visualize a slave that 'goes dead' for n milliseconds x milliseconds after being asked "do you have anything" and responding "no". In that case the network would find this slave dead if there was between y and z nodes on the network since the time between being asked "do you have anything" requests is related to the number of nodes and also if any slaves say "no" or "yes" just imagine the intermittency of this one.

NO, Jan I am not asking you to find a way around this, just accept that such can happen both when "it was the worst of times and it was the best of times".

Erik

List of 59 messages in thread
TopicAuthorDate
is AT89C51 can support Auto Address Rec: feature ?            01/01/70 00:00      
   IF they aren't there, it doesn't do it!            01/01/70 00:00      
      why the automatic address recognition?            01/01/70 00:00      
         Every little helps!            01/01/70 00:00      
            let's calculate a bit            01/01/70 00:00      
               an often forgotten fact            01/01/70 00:00      
                  certainly            01/01/70 00:00      
                     let me try            01/01/70 00:00      
                        this sounds like....            01/01/70 00:00      
                           As I said, it is not easy to find an example thst            01/01/70 00:00      
                              if it\'s not easy to find an example...            01/01/70 00:00      
      WHO told you that you HAVE to use a derivative t            01/01/70 00:00      
         Well ofcourse i am not going to design 100000            01/01/70 00:00      
            I will help you, but not write your code            01/01/70 00:00      
               Well thanks Erik            01/01/70 00:00      
               well sir if i write a code then could you check it            01/01/70 00:00      
                  sure            01/01/70 00:00      
                     well sir its this ...            01/01/70 00:00      
                        you can't do this            01/01/70 00:00      
                           well instead of Rx            01/01/70 00:00      
                        On Comments            01/01/70 00:00      
                           So Sorry for my Mistake            01/01/70 00:00      
                              stop accusing yourself            01/01/70 00:00      
                                 Well sir its Honor for me :-)            01/01/70 00:00      
                           The Right one here goes            01/01/70 00:00      
                              I think you made the wrong change            01/01/70 00:00      
                              this will (almost) work if you only have one data            01/01/70 00:00      
                                 Well sir Eric i think you are Talking about it....            01/01/70 00:00      
                                    not yet            01/01/70 00:00      
                                    Ooooh, another '51 pitfall...            01/01/70 00:00      
                                       Hows That ?            01/01/70 00:00      
                                          still not good...            01/01/70 00:00      
                                    I just noticed            01/01/70 00:00      
                                       as I said            01/01/70 00:00      
                                          Ah i am not in Hurry....            01/01/70 00:00      
                                             still not good II.            01/01/70 00:00      
                                                I have did it... you can see it i have Edited it .            01/01/70 00:00      
                                             ok, look at line 4            01/01/70 00:00      
                                                Simple,like if Address not match then GO_ON            01/01/70 00:00      
                                                   WHAT is in 'b'?            01/01/70 00:00      
                                                      I have finally got it.....            01/01/70 00:00      
                                                         now add the PUSH/POP PSW...            01/01/70 00:00      
                                                            Well i think that Pushing PSW is not neccesary ..            01/01/70 00:00      
                                                               better this than be sorry....            01/01/70 00:00      
                                                               it is            01/01/70 00:00      
                                                                  Sir you are right that carry is effected...            01/01/70 00:00      
                                                                     avoid common pitfalls            01/01/70 00:00      
                                                                     famous last words            01/01/70 00:00      
                                                                        Well sir i will never forget the carry is changed.            01/01/70 00:00      
                                                                           RTFM            01/01/70 00:00      
                                                                        Well sir How to save the Carry ??            01/01/70 00:00      
                                                                           see http://www.8052.com/forum/read.phtml?id=134583            01/01/70 00:00      
                                                                              Well sir i will see this later...            01/01/70 00:00      
                                                                                 so, that is the reason for the hurry            01/01/70 00:00      
         No compulsion!            01/01/70 00:00      
   Oops its Erik not Eric (Proc: For Multiple Data)            01/01/70 00:00      
      stop hurrying            01/01/70 00:00      
   It just hit me - you can't            01/01/70 00:00      
   Well sir i have give up ... means no computer...            01/01/70 00:00      

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