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???
11/19/05 16:02
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 		 #103909 - I am doing that using the Dallas DS2401
Responding to: ???'s previous message
By inclusion of the word "BIASING" I would expect someone with your obvious knowledge to realise that I would be BIASING the lines.
Chris, if you see some of the threads here you will realize that the most dangerous thing you can do in this forum is "to assume the obvious". It may very well be that you "speak clearly" but how am I to know?

"slave discovery/enumeration", which will have collisions only in very controlled circumstances.
I assume you are talking about the "find the slaves and assign them node numbers at power up"
I am doing that using the Dallas DS2401 and standard 3 resistor terminated RS485. There is no "popping" transcievers during the conflicts since the transciever I use is guaranteed to withstand short circuit. Anyhow the confilct is max one byte, so even a chip guaranteed to withstand short circuit forever only has to do it for a few hundered microseconds.

Erik

List of 34 messages in thread
TopicAuthorDate
RS485 Question            01/01/70 00:00      
   drive capacity            01/01/70 00:00      
      3 resistor termination            01/01/70 00:00      
         Only if you have power to burn            01/01/70 00:00      
            15 milliwatts. A lot of power?            01/01/70 00:00      
               Depends on your application            01/01/70 00:00      
                  how are you going to terminate at that            01/01/70 00:00      
                  RS485 loops are hungry...            01/01/70 00:00      
      You will loose all the noise margin!            01/01/70 00:00      
         not if you use 3 resistor termination            01/01/70 00:00      
            Better, but...            01/01/70 00:00      
               works for me, what do you have that is b            01/01/70 00:00      
                  No disagree...look what weird is planned            01/01/70 00:00      
                     Kai, I did not think you did            01/01/70 00:00      
                        Clarification            01/01/70 00:00      
                           3 resistors or not            01/01/70 00:00      
                              Then is all fail-safe bad?            01/01/70 00:00      
                                 Can you see the difference?            01/01/70 00:00      
                                    Kai, you keep ignoring the fact that RS4            01/01/70 00:00      
                                       I ignore nothing            01/01/70 00:00      
                                          It's the best we have and it works when            01/01/70 00:00      
                                             Yes, but it can fail from time to time            01/01/70 00:00      
                                                I have handled that with isolated RS485            01/01/70 00:00      
                                                   We do already            01/01/70 00:00      
                                                      485-422            01/01/70 00:00      
                                                         I challenge you to find a RS422 driver            01/01/70 00:00      
                                                            In the past.            01/01/70 00:00      
                                 All fail safe is good and 0.25V is plent            01/01/70 00:00      
                           That is not RS485, that is J1708            01/01/70 00:00      
                              trick to get around pseudo non random            01/01/70 00:00      
                                 This won't really help.            01/01/70 00:00      
                              Helpful            01/01/70 00:00      
                                 I am doing that using the Dallas DS2401            01/01/70 00:00      
                                    Yes that is what I am planning            01/01/70 00:00      

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