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Rectangular black box with four DB9 ports and USB-B connector

UOTEK

UOTEK UT-860 USB to RS-232 4 Port Data Converter

SKU CH-1XAE-MQ91Z

Converts one USB port to four RS-232 DB9 serial ports with 2 Mbps throughput, USB-powered operation and industrial temperature tolerance from -40 to 85 °C

  • First connectorUSB-B
  • Second connectorDB9 Male
  • Product typeConverter
  • Four independent DB9 ports connect legacy serial gear
  • USB 2.0 interface delivers up to 2 Mbps throughput
  • Bus-powered design removes the need for an external supply
  • Wide OS support from Windows 2000 through 10 plus Mac and Linux
  • Industrial temperature rating of -40 °C to 85 °C for harsh environments

Four-port industrial USB-to-serial converter

The UOTEK UT-860 adds four DB9 male RS-232 ports to a single USB 2.0 connection. It is built for automation engineers, legacy equipment integrators and field technicians who need reliable serial links without external power supplies. The monolithic ASIC design handles UART conversion with zero-delay auto receive and transmit switching.

Sustained 2 Mbps throughput

The converter maintains up to 2 Mbps transmission rates across all four ports simultaneously. Auto-handshake protocol and built-in I/O circuit auto-control manage data-flow direction continuously, preventing buffer overruns during long transfers. USB bus power delivers stable operation without voltage drops that can corrupt extended sessions. Operating temperature spans -40 to 85 °C at 5 to 95 % relative humidity.

DB9 connectors and wide OS support for drop

Each port presents a standard DB9 male connector compatible with existing RS-232 cables and panel mounts. The adapter draws power directly from the USB-B upstream port, eliminating separate power bricks and reducing cabinet wiring. Driver support covers Windows 2000 through 10, Windows CE, Mac and Linux, allowing plug-and-play integration into mixed-OS environments. Status LEDs show power and per-port data activity at a glance.

How it compares

Measured against everything we stock in Serial & Protocol Converters, at today’s prices. Recalculated every night.

Price $78.99
Pricier than about 85% of the 121 comparable items (median $19.99).

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Specifications

Product
Brand nameUOTEK
Model nameUT-860
Product typeConverter
Ports & slots
First connectorUSB-B
Second connectorDB9 Male

Questions about this item

How much heat does the UT-860 generate when all four COM ports run continuously?

The converter operates from -40 to 85 °C and is USB powered, so it draws only bus power and has no fan or external supply.

What must my computer provide for the UT-860 to work without an extra power brick?

A single USB 1.1 or 2.0 Type-B port supplies both data and the 5 V bus power the adapter needs.

Will the UT-860 talk to legacy gear that only runs at 300 bps?

Yes, the baud-rate range is 300 to 921.6 Kbps, covering very slow and fast serial equipment alike.

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