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Compact industrial RS232 to RS485 converter with DB9 female, DB9 male and terminal block, grey enclosure

UOTEK

UOTEK UT-204E RS232 to RS485 Data Converter DB9 Female Male Terminal Block

SKU CH-2NFK-G8ADX

Converts RS-232 signals to RS-485 for long-distance industrial communication up to 1.2 km with 600 W surge protection on each line

  • TypeConverter
  • Connector ADB9 female
  • Connector BDB9 male, with terminal block
  • Connects RS-485 devices to a PC COM port using RS-232 DB9 female and RS-485 DB9 male with terminal block
  • Communicates over 1.2 km at up to 115.2 Kbps with asynchronous half-duplex differential transmission
  • Powers the converter from the serial port itself via unique charge-pump drive technology requiring no external supply
  • Protects the RS-485 lines with 600 W surge and lightning suppression using built-in TVS components
  • Operates reliably from -40 °C to 85 °C at 5 % to 95 % relative humidity in a compact 63 mm × 33 mm × 17 mm housing

Industrial RS232 to RS485 converter

The UOTEK UT-204E is a serial adapter that translates RS-232 signals from a PC COM port into balanced differential RS-485 signals for industrial equipment. It uses a unique charge-pump design that draws power directly from the RS-232 lines without requiring an external supply or port initialisation. The unit features a DB9 female connector on the RS-232 side and a DB9 male connector with a terminal block on the RS-485 side.

Upgrade from direct RS232 wiring

This converter replaces a direct RS-232 cable when the link must exceed the standard 5 m limit or operate in electrically noisy environments. The jump is worth it when connecting remote sensors, PLCs or intelligent instruments up to 1.2 km away over twisted-pair or shielded cable. Built-in 600 W surge and lightning protection on every RS-485 line shields the host port from transients that would damage an unprotected interface.

115.2 kbps over 1.2 km headroom

The adapter handles asynchronous half-duplex communication at baud rates from 300 bps to 115.2 kbps across the full 1.2 km distance. Automatic zero-delay receive/transmit switching and I/O circuit flow control keep the link stable without software intervention. Operating temperature spans -40 to 85 °C at 5 to 95 % relative humidity, so the device remains reliable in harsh cabinets or outdoor enclosures where consumer-grade converters would fail.

Highlights

  • Connects RS-485 devices to a PC COM port using RS-232 DB9 female and RS-485 DB9 male with terminal block
  • Communicates over 1.2 km at up to 115.2 Kbps with asynchronous half-duplex differential transmission
  • Powers the converter from the serial port itself via unique charge-pump drive technology requiring no external supply
  • Protects the RS-485 lines with 600 W surge and lightning suppression using built-in TVS components
  • Operates reliably from -40 °C to 85 °C at 5 % to 95 % relative humidity in a compact 63 mm × 33 mm × 17 mm housing

Specifications

BrandUOTEK
ModelUT-204E
TypeConverter
Connector ADB9 female
Connector BDB9 male, with terminal block

Questions about this item

What are the physical dimensions of the UT-204E converter for mounting?

The converter measures 63 mm × 33 mm × 17 mm, so it fits in tight enclosures and DIN-rail brackets designed for compact serial adapters.

How do I wire the RS-485 side using the DB9 male and terminal block, and what step is often missed?

Connect twisted-pair or shielded cable to the terminal block pins for data lines and ground, then ensure the DB9 male plugs into the RS-485 device; the step often missed is terminating the bus with a 120 Ω resistor at each end.

What protection does the RS-485 port have and will it need replacement after a surge event?

Each RS-485 line includes 600 W TVS surge and lightning protection; after a severe strike the suppressor can degrade, so inspect the port and replace the unit if communication errors appear.

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