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Translucent USB-A to DB9 converter cable with magnetic ring, 4.92ft

UOTEK

UOTEK UT-850N USB to RS485 RS422 Converter 4.92ft

SKU CH-QA7W-YP5ED

Connects USB-A devices to RS-485 or RS-422 serial equipment over 4.92ft with automatic baud-rate detection up to 921.6Kbps and 32-device multi-point support

  • Cable length4.92 ft (1.5 m)
  • First connectorUSB-A male
  • Second connectorDB9 male
  • Product typeConverter
  • Connects legacy RS-422/485 gear via USB-A
  • Auto-detects baud rates from 300 to 921.6 Kbps
  • Links up to 32 devices on one bus
  • ±15 kV ESD protection guards the port
  • 5 m cable with translucent magnetic ring

Industrial USB to Serial Adapter

The UOTEK UT-850N connects legacy RS-485 or RS-422 equipment to a modern USB-A port using a 1.5 metre cable. It supports asynchronous communication in half-duplex or full-duplex modes with automatic data-direction control. The adapter handles baud rates from 300 to 921.6Kbps and can link up to 32 devices on a single bus. Surge and ±15KV ESD protection guard the serial port in harsh environments.

Replaces Native Serial Ports

This converter replaces an onboard DB9 or PCI serial card when a PC lacks native RS-485/422 interfaces. The jump is worth it for industrial machines, PLCs or HMIs that must communicate over twisted-pair cable up to 5,000 metres at 9,600bps. USB bus power keeps the link under five metres from the host, so the adapter suits cabinet-mounted gear without an external supply.

For Field Engineers and Integrators

Technicians maintaining factory automation, building-management or SCADA systems gain a reliable USB bridge to older field devices. The wide temperature range of -20 to 75°C and humidity tolerance up to 95% suit cabinet and outdoor enclosures. Buyers needing galvanic isolation, wireless connectivity or a USB-C host interface should look at other products.

How it compares

Measured against everything we stock in USB Adapter Cables & Dongles, at today’s prices. Recalculated every night.

Price $9.99
Cheaper than about 80% of the 1,430 comparable items (median $14.99).

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Specifications

Product
Brand nameUOTEK
Model nameUT-850N
Product typeConverter
Ports & slots
First connectorUSB-A male
Second connectorDB9 male
Size & build
Cable length4.92 ft (1.5 m)

Questions about this item

What DB9 pinout does the UT-850N use for RS-422 and RS-485?

The DB9 male connector carries T+, T-, R+, R- and GND for RS-422, and T+, T- and GND for RS-485, matching the EIA-422/485 standard pinout.

How do I enable the automatic direction control on the converter?

No configuration is required; the UT-850N uses data-flow auto-direction technology that detects the serial signal and switches the transceiver without driver settings.

When should I add termination resistors to the RS-485 bus?

Add 120 Ω termination at each end of the twisted-pair line when the bus runs at high baud rates or over long distances to prevent signal reflections.

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