Siemens S5 Exended Memeor via the AS511 Protocol

Normally I am answering posts here but in this case I need some Siemens GURU help. The newer S5 Model controllers have extended memory which can be accessed via an RK512 or 3964(r) protocol using the DX keyword. We want to add support for the same memory to our AS511 driver (programming port connection) but I cannot find in any docuemntation that the protocol has been updated to support this. I supspect that it has not but wonder if anyone has any knowledge that indicates it does.

Thanks for your help.