The short answer
Match RS485 baud (DIP1) on all masters, set CAN terminal DIP2 to 0, and use a cable with only H/L/GND pins.
Plain explanation
From the Pylontech manual for the US5000: RS485 baud DIP1 the same on all masters; restart. CAN terminal resistance DIP2 set to 0. The rest of the checklist is below; work through it in order. Installer only: DC and AC work on a live PV system is dangerous, so owners should note the code and call their installer.
Steps from the source
- RS485 baud DIP1 the same on all masters; restart
- CAN terminal resistance DIP2 set to 0
- CAN uses only H/L/GND pins – correct cable
Source
Pylontech US5000/US5000-B Installation Manual V1.0 (2024-09), Troubleshooting, Troubleshooting, printed p27-29pylonwebs3.s3.amazonaws.com ↗
Where installers ask this
- Pylontech connection to CerboGX (r/Victron)
- reddit.com/r/Victron/comments/16o8aso/
- reddit.com/r/Victron/comments/1ce0jvi/
- reddit.com/r/SolarDIY/comments/1b7fz4a/
- reddit.com/r/Victron/comments/1ohgtnb/
General guidance based on the manufacturer's manual or the named source. Always follow the current manual for your exact model and your national code. DC and AC electrical work is for qualified installers only. Not affiliated with or endorsed by any brand named; trademarks belong to their owners.