StarTech.com USB serial adapter - RS422 - RS485 - Industrial - serial - 1 port S2500 Mobility Access Switch - S2500-48P-US so it doesn't matter which

so it doesn't matter which way you plug it in

providing fast data rates of up to 921Kbps in RS232/422/485 operating modes

Backwards compatible with USB1

For transmitting data at gigabit speed over hundreds of miles with little integrity loss

StarTech.com USB serial adapter - RS422 - RS485 - Industrial - serial - 1 port S2500 Mobility Access Switch - S2500-48P-US so it doesn't matter whichThe ICUSB422IS 1 Port Metal Industrial USB to RS422 RS485 Serial Adapter w Isolation connects to a computer using USB and allows you to connect any RS 422 or RS 485 serial device via the provided DB9 port or hard wired to the terminal block. The USB to serial adapter features circuit isolation to ensure that sensitive controls and devices will not be damaged while connected, making it a viable solution for connecting costly industrial serial devices.