Victron Orion-Tr Isolated DC-DC Charger remote cable:
In the Orion-Tr Isolated DC-DC Chargers the remote on/off circuit is referenced to the primary battery (e.g. starter battery). The OrionTr Isolated DC-DC Charger remote cable is intended for applications were the remote on/off signal is referenced to the secondary
battery (e.g. lithium battery with BMS).
Diagram:
https://www.victronenergy.com/upload/documents/Orion-Tr-Isolated-DC-DC-Charger-remote-cable-EN.pdf?_ga=2.28785084.1894005248.1651437132-327103746.1649035519
