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    BMS AP9921X-AP9922; RS485 (Modbus Wiring Pinout)

     
     
    Issue:
    AP9921X-AP9922 Battery Management System RS485 (Modbus Wiring Pinout)
     
     
    Product line:
    AP9921X-AP9922, Battery Monitoring System (BMS)
     
     
    Environment:
    AP9921X-AP9922 Wiring for Modbus
     
     
    Cause:
    The manual shows the DB9 connection for the RS485/Modbus says Pin2:D0, Pin:D1

     
    Resolution:
    Pin2:D0 (Positive), Pin3:D1 (Negative)
     
     

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