24.10.2016, 07:58
Original and counterfeit chips work exactly the same way from the system point of view.
This one clearly has counterfeit chip but seems to work correctly:
http://www.ebay.co.uk/itm/1PCS-USB-to-TT...1786656282
The one that Peter suggested is RS232, not RS485. You can also get USB-RS485 there, but looking at provided schematics it seems to be lacking line-biasing resistors (which are present on chinese board), which are needed for proper operation.
This one clearly has counterfeit chip but seems to work correctly:
http://www.ebay.co.uk/itm/1PCS-USB-to-TT...1786656282
The one that Peter suggested is RS232, not RS485. You can also get USB-RS485 there, but looking at provided schematics it seems to be lacking line-biasing resistors (which are present on chinese board), which are needed for proper operation.