A very important adapter !

This is a widely used adapter ,It is used for PC , Cash register
,Modem ,POS machine ,Scanner, Label Printer ,Handwriting board ,Printer ,Access Control System etc. It will make you satisfied ,
if you try to use it . UT-891 USB To RS485/RS422 converter USB2.0 Industrial Data adapter  http://www.htic-tool.com/ut891-usb-to-rs485rs422-converter-usb20-industrial-data-adapter_p884.html