RS485 and DH485 are not the same, I am sure someone who knows all the differences can comment about them.
From my understanding RS485 is a physical standard whereas DH485 is a protocol used by Allen Bradley.
Are you writing your logic in ladder 2 or another ladder, if it is in another ladder then you will need to put a JSR(Jump to Subroutine) in ladder 2.
By default ladder 2 is the only one scanned when the PLC is in run mode.
Also these symbols and descriptions are only stored in the RSLogix 500 file, so if you uploaded the program from the PLC it will not include comments, you need a copy of the original RSLogix 500 file for that.