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USB to RS-232/422/485 Converters - ULI-310 Series
Add an RS-232, RS-422 or RS-485 port to a USB only PC.
BB-USR604
Four RS-232/422/485 serial ports. UL C1 D2 Rated. Easy to set up with DB9 M serial connectors and a high retention USB connector that works with a standard USB cable (included). LEDs indicate transmit and receive. 10-30 VDC inputs are a terminal block with a redundant jack.