NOT TRUE, Yes you can communicate using DH485, from micro logix to Pview 300 or Pview 300 Micro DF-1 OR DH485
DF-1 comms is straight forward,
If using DH485
Configure your plc program communication driver to DH485 in RSLogix, download, change your RSLinx settings, go online and restart processor. If using Win 2000 or XP will need to use delete DF-1 in Linx, then install pic adaptor in Linx to get DH485 to communicate with PLC.
Other option with DH485 installed on program in PLC is to use communication default button on processor after program downloaded, hold button until light comes on then DF-1 default comms to PLC becomes active again. Be sure to turn off default comms button after done with PC to PLC afterwards to get Pview to communicate to PLC.
Hope it helps.