The simple diagram is as below: PC->USB to RS232 converter (ex: ATEN UC232A)->RS232 to RS422/485 converter(ex:ATEN IC485SN)->US3344i RS422/485 connector
If uses ATEN IC485SN, the detail setup and connection diagram is in attachment.
Note:Adjust DIP switch, like from RS485 to 422 or the opposite way, US3344i needs to reboot for normal operation.
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