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Small black box with DB9 female and DB9 male plus terminal block connectors

UOTEK

UOTEK UT-2201 RS-232 to RS-485 Data Converter DB9

SKU CH-H8FG-V1KAE

Converts RS-232 signals to balanced differential RS-485, extending transmission distance to 1.2km with zero-delay auto direction control at 300-115.2kbps

  • First connectorDB9 female
  • Second connectorDB9 male, with terminal block
  • Product typeConverter
  • Bidirectional RS-232 to RS-485 conversion extends serial links to 1.2km
  • Auto-direction control removes handshake signals for plug-and-play half-duplex operation
  • Port-powered charge-pump design needs no external supply or port initialisation
  • Wide 300-115.2kbps baud range suits legacy and modern industrial gear
  • DB9 female to DB9 male with terminal block fits panel and field wiring

RS-232 to RS-485 signal converter

The UOTEK UT-2201 converts RS-232C signals into balanced differential RS-485 signals for long-distance communication. It extends the transmission distance of RS-232 links up to 1.2km using twisted-pair or shielded cable. The device supports asynchronous half-duplex transmission at baud rates from 300bps to 115.2Kbps. It is suited for industrial automation, point-to-point and point-to-multipoint networking between hosts or microcontrollers.

Check your serial port and cabling

Verify that your host equipment provides an RS-232 DB9 female port to match the converter's DB9 male connector. Ensure the RS-485 side uses a DB9 male or terminal-block connection compatible with your field devices. Confirm the application operates in half-duplex mode, as the converter does not support full-duplex operation. No external power supply or handshake signals such as RTS or DTR are required for operation.

Port-powered design with auto direction control

The unit draws power directly from the RS-232 charge pump, eliminating the need for an external adapter and reducing cable clutter. Built-in zero-delay auto receive and transmit conversion manages data flow direction automatically without software configuration. This allows existing RS-232 half-duplex software to run without modification. The compact DB9 form factor with integrated terminal block simplifies panel or DIN-rail mounting in control cabinets.

How it compares

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

Price $2.99
Cheaper than about 99% of the 121 comparable items (median $19.99).

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Specifications

Product
Brand nameUOTEK
Model nameUT-2201
Product typeConverter
Ports & slots
First connectorDB9 female
Second connectorDB9 male, with terminal block

Questions about this item

Does the UT-2201 package include any cables or is only the DB9 female to DB9 male with terminal block converter supplied?

Only the converter with its DB9 female and DB9 male plus terminal block connectors is included; twisted-pair or shielded cable for the RS-485 side must be purchased separately.

The specs list 300 to 115.2 kbps; should I pick a fixed baud rate or does the converter auto-sense?

The device supports any rate in the 300-115.2 kbps range without manual selection; it uses zero-delay auto receive/transmit conversion so the host software sets the speed.

How far can I run the RS-485 link at 115.2 kbps before errors appear?

The manufacturer states a maximum RS-485 distance of 1.2 km; actual error-free length at the top baud rate depends on cable quality and noise environment.

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