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Usb To Isolated 422/485 Tb, Leds - Locked Serial these Compact, Isolated Usb To Rs-232 And Usb To Rs-422, And Rs-485 Converters Allow You To Add An Asynchronous Serial Port To Your Usb Only Pc. The Built In 2 Kv Isolation Protects Your Port From Dangerous Ground Loops. They Are Perfect For Connecting To Remote Devices Or Programming Ports In Field ..