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???
11/03/08 22:47
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 		 #159600 - this is one of the biggest mistakes in RS485
Responding to: ???'s previous message
Per Westermark said:
If you select to use two processor pins instead - or hard-code the receive enable signal as active - then you can listen in on your own transmissions. This allows you to hear collisions.


In a specifically crafted '485 network, you *might be able* to hear collisions, but you should not rely on this generally.

Many are falling into this specific pit of RS485.

JW

List of 24 messages in thread
TopicAuthorDate
Interfacing RS485 (SN75176) with AT89c51            01/01/70 00:00      
   Select your components with care            01/01/70 00:00      
   Compnents are irreplacable !!            01/01/70 00:00      
      What do you miss in the datasheet            01/01/70 00:00      
      It is a simple chip            01/01/70 00:00      
   do not do rs485 without ...            01/01/70 00:00      
   Here's the info for starting            01/01/70 00:00      
   Controlling the sn75176!!            01/01/70 00:00      
      use the \"industrial strangth\" LT1785 instead            01/01/70 00:00      
         Easy to control the RS-485 transeciever            01/01/70 00:00      
            this is one of the biggest mistakes in RS485            01/01/70 00:00      
               Not so much specific for RS-485            01/01/70 00:00      
               might be???            01/01/70 00:00      
                  These are NOT RS485            01/01/70 00:00      
                     Lack of dominant bit state            01/01/70 00:00      
                        that's exactly why on RS485...            01/01/70 00:00      
                           Token-passing requires explicit or arbitrated mast            01/01/70 00:00      
                        the amazing thing is ...            01/01/70 00:00      
                           ... that it matter            01/01/70 00:00      
                              I am NOT talking about multiple masters, ...            01/01/70 00:00      
      follow the link            01/01/70 00:00      
         the two REAL 485 sources            01/01/70 00:00      
            Preview?            01/01/70 00:00      
               I do not know why            01/01/70 00:00      

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