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Small black box with USB-B, RJ-45 and DB9 connectors

UOTEK

UOTEK UT-820E USB to RS-485 RS-422 Data Converter

SKU CH-3SWP-3Y4QR

Converts USB to RS-485 or RS-422 with optical isolation, auto baud detection up to 128000bps, and 5000m range

  • TypeConverter
  • Connector AUSB-B female
  • Connector BRJ-45 and DB9 male
  • Auto-direction control simplifies setup
  • 5000 m range at 9600 bps extends reach
  • 128-device multipoint support scales networks
  • 5 kW surge and ±15 kV ESD shield ports
  • Works from -40 to 85 °C in harsh sites

Industrial USB to RS-485/422 converter

The UOTEK UT-820E connects a PC USB port to RS-485 or RS-422 field buses using an RJ-45 or DB9 male connector. It is built for engineers and integrators who need to link legacy industrial equipment, PLCs, or sensors to modern laptops or embedded PCs that lack native serial ports.

128-device multidrop at up to 128000 bps

The adapter handles asynchronous communication in half-duplex two-wire or full-duplex four-wire modes with automatic direction control. It supports point-to-multipoint networks of up to 128 nodes at baud rates from 300 to 128000 bps. At 9600 bps the RS-485/422 segment reaches 5000 m, while the USB link is limited to 5 m and the highest speeds require shorter cable runs.

Optical isolation with 1500 W surge protection

The unit provides 1500 W lightning and surge protection plus ±15 kV ESD protection on the serial side, shielding the host computer from industrial transients. Status LEDs for power, TX and RX give immediate visual feedback. The rugged enclosure measures 92×64×25 mm and operates from -40 °C to 85 °C at 5 % to 95 % humidity, making it suitable for cabinet or field mounting.

Highlights

  • Auto-direction control simplifies setup
  • 5000 m range at 9600 bps extends reach
  • 128-device multipoint support scales networks
  • 5 kW surge and ±15 kV ESD shield ports
  • Works from -40 to 85 °C in harsh sites

Specifications

BrandUOTEK
ModelUT-820E
TypeConverter
Connector AUSB-B female
Connector BRJ-45 and DB9 male

Questions about this item

Will the UT-820E work with my existing RS-485 equipment that runs at 9600 bps?

Yes, the converter auto-detects baud rates from 300 to 128,000 bps and supports RS-485 transmission up to 5000 m at 9600 bps.

How can I confirm the UT-820E is communicating correctly after I connect it?

The unit has PWR, TXD and RXD indicators; PWR shows power, TXD flashes during transmit and RXD flashes during receive.

Does the UT-820E package include the twisted-pair cable I need for the RS-485 run?

The box contains the converter with USB-B female, RJ-45 and DB9 male ports; twisted-pair or shielded cable for the RS-485/422 side must be purchased separately.

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