Siemens Teleperm AS230

For retrieving parameters of this DCS, I need to know about this old Siemens Teleperm AS230 system.

1)What type of telegram transfer takes place between one module to another and to the Server system ?

2)In which module (I/O control module) is these transfer instructions written? Is STRUk used for programming ?

3) where can I find a general system configuration/structure of this system ?

If someone knows anything about this AS230 system, please reply.

Thanks in advance.