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???
05/05/05 14:34
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Msg Score: +1
 +1 Good Answer/Helpful		 #92999 - two of the same
Responding to: ???'s previous message
A little trick:

I have two pins in the 485 connector that are shorted in the matching cable plug.

These 2 are connected in series in the unit and if both pairs are shorted a relay pull and open the termination network.

This way "idiots" can wire the system and no missing or double termination occur.

Erik

List of 40 messages in thread
TopicAuthorDate
Your opinion about port config pls.            01/01/70 00:00      
   Its irrelevant            01/01/70 00:00      
      Can you clearify pls?            01/01/70 00:00      
         always            01/01/70 00:00      
   More....            01/01/70 00:00      
      Elementary, my dear Watson            01/01/70 00:00      
   Some reference circuits I've looked at            01/01/70 00:00      
      fittness for purpose            01/01/70 00:00      
         I'd second that            01/01/70 00:00      
         The intention is...            01/01/70 00:00      
            on-board, I hope            01/01/70 00:00      
               I2c is forbidden to leave the board...            01/01/70 00:00      
                  I would'nt            01/01/70 00:00      
   The outside world            01/01/70 00:00      
      Sure, you did! ;-)            01/01/70 00:00      
         Multi controller approach.            01/01/70 00:00      
            Some practical restrictions...            01/01/70 00:00      
               concentrate the data            01/01/70 00:00      
               Something like this.            01/01/70 00:00      
                  maybe not needed            01/01/70 00:00      
                     RS485 Stubs.            01/01/70 00:00      
                        two of the same            01/01/70 00:00      
                           Re: Two of the same.            01/01/70 00:00      
                              you are right            01/01/70 00:00      
                  let Geert do it differently            01/01/70 00:00      
                     on data and star            01/01/70 00:00      
                        bus and star            01/01/70 00:00      
                     I prefer 75176 -> RS485 & 75179 -> RS422            01/01/70 00:00      
                        I've got a lot of 75176s in my drawer :)            01/01/70 00:00      
                           What about CAN?            01/01/70 00:00      
                              CAN            01/01/70 00:00      
                                 CAN            01/01/70 00:00      
                                    CAN CAN            01/01/70 00:00      
                                 Challenges, indeed...            01/01/70 00:00      
                                    I would            01/01/70 00:00      
                                    how about Power Line Communications?            01/01/70 00:00      
                                       X10-alike, I suppose?            01/01/70 00:00      
                                          Ya..            01/01/70 00:00      
                                             Always welcome...            01/01/70 00:00      
                                             oops !!!            01/01/70 00:00      

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