Description
UOTEK UT-890A USB to RS-485/422 Converter (USB 2.0)
Key Features
- New UOTEK UT-890A USB to RS-485/RS-422 converter
- USB-powered — no external power adapter required
- Auto direction control — no jumper wire or handshake signal (RTS/DTR) needed for full-duplex (RS-422) or half-duplex (RS-485) mode
- Baud rate 300 to 921.6Kbps, auto-detect
- Supports point-to-point or point-to-multipoint communication — up to 32 RS-422/RS-485 devices on one converter
- Surge and ±15KV ESD protection on every signal wire
- PWR / TXD / RXD status LEDs
Technical Specifications
| Brand | UOTEK |
| Condition | New |
| Model | UT-890A |
| Standards | USB V1.1 / 1.0 / 2.0, RS-485, RS-422 EIA |
| Connector | USB-A male to DB9 male |
| Cable Length | 1.5m |
| Transmission Distance | Up to 1,200m on RS-485/422 side (at 9,600bps); USB side max 5m |
| Baud Rate | 300 – 921.6Kbps, auto-detect |
| Loading Capacity | Up to 32 RS-422/RS-485 devices (point-to-multipoint) |
| Port Protection | Surge protection, ±15KV ESD |
| Operating Temperature | -40°C to 85°C |
| Relative Humidity | 5% to 95% |
| Warranty | 3-month warranty |
Compatible Models
Supported Operating Systems:
- Windows 2000 / XP / Vista / 7 / 8 / 8.1 / 10, Windows CE
- Mac OS, Linux
Typical Use:
- Connecting a PC or laptop USB port to RS-485/RS-422 PLCs, Modbus RTU devices, and industrial sensors
Disclaimer
- Requires a driver install for the correct virtual COM port to appear on some operating systems — download the driver for your OS from UOTEK before use.
- Confirm your target device uses RS-485 or RS-422 signaling and check wiring polarity (T/R+, T/R-) before connecting.
- Not compatible with RS-232 devices without an additional RS-232 converter.
If you are unsure which converter or wiring your equipment needs, chat with the NJ Bravo team before ordering. We will help you check compatibility.
Package Contents
- 1x UOTEK UT-890A USB to RS-485/422 converter (USB-A to DB9, 1.5m cable)
- No driver CD or printed manual included — download the driver and user manual from UOTEK’s official website
Warranty
3-month warranty against manufacturing defects. Physical damage, incorrect wiring, and misuse are not covered.
Additional Notes
Product Description
The UOTEK UT-890A is a USB 2.0 to RS-485/RS-422 converter for connecting a PC or laptop to industrial serial equipment such as PLCs, Modbus RTU devices, and RS-485 sensors. It is USB-powered, auto-detects baud rate and signal direction, and supports point-to-multipoint wiring for up to 32 devices on a single converter. Confirm your equipment’s signal type (RS-485 or RS-422) and download the correct driver for your operating system before use.
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