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Compact black RS-232 to RS-422 converter DB9 female to male with terminal block

UOTEK

UOTEK UT-202D RS-232 to RS-422 Data Converter DB9 Female to Male with Terminal Block

SKU CH-A2DF-1QHHW

Converts RS-232 signals to RS-422 for 1.2 km transmission using a DB9 female-to-male adapter with terminal block, no external power needed

  • First connectorDB9 female
  • Second connectorDB9 male，with terminal block
  • Product typeCONVERTER
  • Converts RS-232 to RS-422 for long-distance serial links
  • Extends transmission to 1.2 km over twisted-pair cable
  • Operates from -25 to 70 °C in harsh environments
  • Zero-delay auto direction control needs no handshake signals
  • Powered directly from the RS-232 port, no external supply needed

Converter for RS-232 and RS-422

The UOTEK UT-202D converts signals between RS-232C and RS-422 EIA/TIA standards. It connects a DB9 female port to a DB9 male port with an integrated terminal block. The unit draws power from the RS-232 line using charge-pump technology so no external supply is needed. It suits engineers linking PCs to industrial instruments over long cables.

Terminal block and auto direction control

The terminal block on the RS-422 side simplifies wiring with twisted-pair or shielded cable. Built-in zero-delay auto receive and transmit conversion controls data flow direction without RTS or DTR handshake signals. This allows existing RS-232 full-duplex software to run unchanged. The converter operates in asynchronous half-duplex differential mode across the supported baud range.

1.2 km reach at 115.2 KBPS

RS-422 differential transmission extends the link to 1,200 metres while RS-232 remains limited to 5 metres. The device handles baud rates from 300 to 115.2 KBPS within a -25 to 70 °C temperature range and 5 % to 95 % humidity. It is not suited for full-duplex RS-422 applications or systems requiring isolation or baud rates above 115.2 KBPS.

How it compares

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

Price $10.99
Cheaper than about 90% of the 121 comparable items (median $19.99).

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Specifications

Product
Brand nameUOTEK
Model nameUT-202D
Product typeCONVERTER
Ports & slots
First connectorDB9 female
Second connectorDB9 male，with terminal block

Questions about this item

Does the DB9 connector or terminal block need periodic tightening or replacement?

The unit uses a DB9 female, a DB9 male and a screw terminal block — all passive connectors with no moving parts, so no scheduled tightening or replacement is required.

At 115.2 KBPS the RS-422 link is rated for 1.2 km; what stops me going further?

The 1.2 km figure is the specified maximum for RS-422 differential signalling; beyond that distance signal attenuation and timing margins exceed the design limits.

The converter draws power from the RS-232 port — does it add noticeable heat inside a closed cabinet?

It operates from -25 °C to 70 °C with no fan and no external supply, so heat contribution is minimal in a ventilated enclosure.

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