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    Does it matter where the pull up / pull down resistors are located within the ATV31 multiple drive network?

    Issue:   Does it matter where the pull up / pull down resistors are located within the ATV31 multiple drive network?
     
    Product Line:   ATV31
     
    Environment:  All
     
    Cause:   Terminating resistor
     
    Resolution:   Not really.
      
    The ATV31 does not have internal pull up / down resistors for the rs-485 communications. Therefore, if it is used on a network with PLC that also does not have pull up-down resisitors for the RS485 resistors must be added at one of the devices.
    At one drive add:
    10k resistor between +10 (RJ45 pin 7) and D_B (Communication +, RJ45 pin 4)
    10k resistor between D_B and COM (RJ45 pin 8)
    4.7k resistor between COM and D_A (RJ57 pin 5)


     

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