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    BMS AP9921X-AP9922; RS485 (Modbus Wiring Pinout)

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

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

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