HS3, RCS Serial Plugin Status?

I have read the threads there, specifically this thread, and am confused about the HS3 status of the RCS plugin that I recently downloaded from the HS3 plugins interface. I have a single TR40 that I currently read and update via scripts in HS2. Can anyone tell me if than functionally is reliably available in HS3?

It appears that the (scripting) object model for the HS3 version is different than in HS2 (e.g.):
Dim objRCS As Object
objRCS = hs.PluginFunction("RCS Serial Thermostats", "RCS", "CmdSetOutsideTemp", {obj1,obj2})

If this is correct, is there any documentation or other guidance on what the other read/write/query commands are?

I noticed that sdwinkelman posted what looks like an updated plugin for HS3, is this the module folks are using instead of the one in the HS3 downloads?

Thanks
Gary