REC Active settings for "Main Relay" and "Charge Optocoupler"

I am setting up a REC Active BMS with Victron integration.

I will use CAN bus to control the charge and discharge profiles, but I'm also connecting a master cut-off contactor.

The documentation for the REC HV and LV diconnect commands and associated switches are not perfectly clear to me.

I believe the setting CMAX (and MAXH) controls the Charge Optocoupler (pin 14 and 15), and CMIN (and MINH) the Main Relay (pin 4&5).

I also have a question regarding setting STRN (number of inverter devices on the bus). What is the definition of an Inverter here - just the Multiplus or also the Solar controllers. The reason I'm asking is to understand the max charge/discharge (MAXC and MAXD) current setting.

REC list this as max per inverter device, so having a Multiplus as well as two Solar controllers one can end up allowing to much current if the setting is "per inverter"

Appreciate any help