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Maarten Brock
01/10/13 03:07
Read: 675 times
The Netherlands

#189117 - in series
Responding to: Satish S Munot's previous message
Satish S Munot said:
How current loop will support 256 node addressing?
Or how to implement RS485 to 4 to 20mA / (0 to 20)mA for multinode systems?

Well, I think the easiest solution is to have the current running for a 1 (default) and break it to create a 0. Then each node can listen and transmit on the same line. There is no need for DriverEnable or ReceiverEnable as in RS485. Just a couple of opto-couplers on RX and TX will do. The downside is that it will always consume power.

List of 10 messages in thread
RS485 Communication Line      Satish S Munot      01/08/13 05:11      
   One eighth load receivers      Oliver Sedlacek      01/08/13 07:07      
   Length?      Satish S Munot      01/08/13 07:40      
      current loop      Maarten Brock      01/09/13 16:38      
         Current loop       Satish S Munot      01/09/13 23:27      
            Try googling "current loop"       Richard Erlacher      01/10/13 00:24      
            in series      Maarten Brock      01/10/13 03:07      
      That works      Oliver Sedlacek      01/10/13 01:52      
         And...      Kai Klaas      01/10/13 05:14      
   Current Loop      Satish S Munot      01/10/13 06:23      

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