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Small silver metal box with DB9 female socket on one side and DB9 male plus terminal block on the other

UOTEK

UOTEK UT-201B RS232 to RS485 Data Converter

SKU CH-JZ2C-Z7PR7

Converts RS-232 signals to balanced differential RS-485 for 1.2km transmission at 300-115.2kbps with 600W surge protection

  • First connectorDB9 female
  • Second connectorDB9 male with terminal block
  • Product typeConverter
  • Half-duplex differential transmission extends reach to 1.2 km
  • 600 W surge protection guards RS-485 lines against lightning
  • Auto-direction I/O circuit removes handshake signals for plug-and-play operation
  • 300 bps to 115.2 kbps baud range covers legacy and modern gear
  • DB9 female to DB9 male with terminal block connects PC and field devices

UOTEK UT-201B Serial Converter

The UOTEK UT-201B converts RS-232 signals to balanced differential RS-485 signals for industrial equipment. It connects a PC DB9 port to twisted-pair or shielded cable via a terminal block. The unit draws power from the RS-232 charge pump without needing port initialisation.

Half-Duplex Distance Limits

Asynchronous half-duplex transmission reaches 1,200m on the RS-485 side but only 5m on the RS-232 side. Baud rates span 300bps to 115.2kbps across the link. Each RS-485 line carries 600W surge and lightning protection.

Point-to-Multipoint Headroom

The adapter builds point-to-point or point-to-multipoint networks for automation, access control and ticketing systems. Zero-delay auto transceiver switching removes the need for RTS or DTR handshake signals. Existing RS-232 software runs unchanged because flow direction is handled in hardware.

How it compares

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

Price $9.99
Cheaper than about 91% of the 121 comparable items (median $19.99).

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Specifications

Product
Brand nameUOTEK
Model nameUT-201B
Product typeConverter
Ports & slots
First connectorDB9 female
Second connectorDB9 male with terminal block

Questions about this item

How do I choose between the DB9 female and DB9 male with terminal block connectors on this UT-201B?

Connect the DB9 female end to your PC or device RS-232 port and the DB9 male with terminal block to the RS-485 twisted-pair or shielded cable for the field device.

What does the 115.2kbps baudrate mean when the converter is installed in a real machine?

It sets the maximum asynchronous half-duplex transmission speed between the RS-232 and RS-485 sides; actual throughput depends on cable quality and the connected equipment.

Which interface standard does the RS-485 side follow and what distance does it cap in practice?

The RS-485 side follows the RS-485 standard and supports up to 1,200m transmission distance using twisted-pair or shielded cable.

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