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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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