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Compact RS-232 to TTL converter with DB9 connector, 62×34×18 mm

UOTEK

UOTEK UT-210T RS-232 to TTL Data Converter 3.3V DB9

SKU CH-R4KC-S35VR

Converts RS-232 signals to 3.3 V TTL levels up to 115.2 Kbps over 5 m, powered from the serial port

  • Product typeCONVERTER
  • Port-powered RS-232/485/422 operation removes need for external supply
  • 3 V TTL output matches low-voltage logic requirements
  • 300 to 115.2 Kbps baud range covers legacy and modern speeds
  • Compact 62×34×18 mm DB9 form factor fits tight enclosures
  • Industrial -40 to 85 °C rating ensures reliability in harsh environments

Industrial RS-232 to 3.3V TTL Converter

The UOTEK UT-210T converts RS-232 signals to 3.3V TTL levels for direct connection to microcontrollers or logic circuits. It draws power from the RS-232 port itself, eliminating the need for an external supply. The DB9 connector provides a standard interface for industrial equipment. Operation spans 300 to 115.2Kbps over distances up to 5M.

Engineers integrating legacy serial gear

This adapter suits developers linking RS-232 instruments to 3.3V UART pins on embedded boards. It operates in asynchronous full-duplex mode using twisted-pair or STP cabling. Buyers requiring hardware handshaking lines such as RTS or CTS should look at a different model, as this unit carries only TXD, RXD and GND. The operating range of -40 to 85 degrees Celsius fits harsh environments.

3.3V TTL output voltage

The converter translates RS-232 levels to a 0 to 3.3V TTL signal, matching the logic threshold of many modern microcontrollers. A 5V TTL system would not be compatible with this specific output level. The compact 62 by 34 by 18 millimetre housing fits inside tight enclosures. Port-powered operation simplifies installation by removing a separate power connection.

How it compares

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Price $12.99
Cheaper than about 80% of the 121 comparable items (median $19.99).

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Specifications

Product
Brand name1ST PC CORP.
Model nameUT-210T
Product typeCONVERTER

Questions about this item

Should I choose the 3.3 V TTL output model or look for a 5 V version?

This converter provides a fixed 3.3 V TTL level; if your target device requires 5 V logic you would need a different adapter.

What does the 115.2 Kbps baud rate mean when the converter is installed in a system?

It is the maximum asynchronous full-duplex speed supported; actual throughput will depend on the host serial port and cable quality up to the 5 m distance limit.

Which serial standard does the DB9 connector follow and what does that limit in practice?

The DB9 follows RS-232 TIA/EIA, so signal levels and the 5 m transmission distance are defined by that standard.

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