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11/30/04 12:49
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#82234 - rs485 distance problem

Hi all,

With my rigs, with 49 nodes on a rs485 bus, the longest distance I could communicate with is about 400 meter and max. of 10-11 nodes. The resting nodes are not able to communicate.

I have used max3041E at nodes, rate is 19.2Kbps and cable used is cat5.

I don't think that overloading is a problem, because if all the nodes are detached from bus while only 15th node is on bus(450 meter), I still have no communication. So what I came up with is that problem is distance itself.

I've changed the converter (RS232/485) but it didn't make any good, contrary, the distance dramatically dropped to 200 meter.

I cancelled the one-end terminating resistor or even of both sides but again had no improvement. I also applied some biasing in compliance withe doc. of B&B electronics hasn't made either.

So I strongly need your advices about distance improvement.

Thanks in advance.

Rustu Kaya

List of 10 messages in thread
TopicAuthorDate
rs485 distance problem            01/01/70 00:00      
   ten ways to bulletproof RS-485            01/01/70 00:00      
   Sounds like a loading problem            01/01/70 00:00      
   RS485 Cable            01/01/70 00:00      
      RS485 Cable            01/01/70 00:00      
   Adapters            01/01/70 00:00      
   distance problem            01/01/70 00:00      
      distance problem            01/01/70 00:00      
         distance problem            01/01/70 00:00      
      all the above            01/01/70 00:00      

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