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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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