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RS232 - RS485 Converter, Port-Powered

  • Part: XS201A
  • In Stock


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This bi-directional RS232 to RS485 converter is a port-powered simple and reliable solution for most standard commercial and industrial communications needs. It converts RS232 signals to half-duplex RS485 balanced differential signals and can extend the communication distance up to 4000 FT (1.2 km).

This RS232 to RS485 converter is port-powered, it uses an internal amplifier to gain power from the RS232 signals (RTS, DTR, TXD) without interfering with the RS232 interface. In case the RS232 port is not capable of supplying sufficient power an external power supply can easily be connected to the converter.
Automatic Send Data Control is enabled which means no software drivers are needed.

This converter utilizes the solid MAX485E processor chip from Maxim/Dallas Semiconductor and a supporting driver IC from Philips, which makes this RS232 to RS485 converter suitable for most applications, including industrial, business and any general office computer device.

It is a bi-directional RS232 to RS485 converter (meaning it communicates in both directions), reliable and cost-effective that easily lets you connect any RS485 device directly to your computer's serial RS232 COM port, efficiently converting standard RS232 signals to RS485 and vice versa.

A simple and reliable solution for most general and industrial communication needs. Header terminal board is included with each converter.

Overall features
  • Port-powered RS232 to RS485 converter
  • No external power supply required
  • Fail-safe bias resistors
  • Plug and play, no drivers needed
  • Static and surge protected converter
  • Optional external power supply
  • Automatic Send Data Control.
  • Working mode: asynchronous, half-duplex.
  • Terminal board included with each converter.

Useful optional accessories
(not included)

Null modem adapter
Null modem adapter

DB9 to RJ45 adapter
DB9 - RJ45 adapter

DB9 gender changer
Gender Changer

5V power supply
5V Power supply
Model number XS201A
Baud rate 300 - 115200bps
Power Port-powered from RS232 (RTS, DTR, TXD).Optional external power: 5 - 12VDC
Current consumption less than 10mA
Processor MAX491/Philips HEF4093
Interface RS232 DB9 female connector. Pin 7 (RTS) and 8 (CTS) are tied together. Pin 4 (DTR), 6 (DSR), and 1 (CD) are tied together.
Interface RS485 DB9 Male and terminal board
Working mode 2-wire RS232 to RS485 asynchronous, half-duplex
Compatible with Modbus RTU/ASCII, BACnet
Standards EIA/TIA RS232 / RS485
Housing ABS plastic
DB9 sockets and shields Electroplated steel
DB9 pins Stainless steel
Transmission distance RS232: Typical: 15 FT (5m)
RS485: Typical 4000FT (1200m)
Static/surge protection 1500W / 600W/ms
Operating Temp. -13°F to 158°F (-25°C to 70°C)td>
Operating humidity 5% To 95% - No Condensation
Dimensions 2.47" x 1.33" x 0.70" (62.8 mm x 33.8 mm x 17.8 mm)
IP rating IP40
Compliance CE, FCC, RoHS, ISO 9001
Warranty 1 year Limited Warranty

For alternative RS232 to RS485 / RS422 solutions please see our full selection of serial converters.

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Date Added: 11/09/2014 by Eric Sanders
4 of 5 Stars4 of 5 Stars
got this converter from usconverters, works fine but i wish the screws were a bit longer so it can b...

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Date Added: 04/13/2013 by Dave Wheeler
5 of 5 Stars5 of 5 Stars
Thanks for the speedy delivery. The converter works fine with my telescope, couldn't ask for more. G...

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Date Added: 07/13/2011 by Martin Janson
4 of 5 Stars4 of 5 Stars
Good little device for converting rs232 to rs485. Works fine but I actually wish it was bigger. The ...

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Date Added: 03/14/2011 by Roger Brandon
4 of 5 Stars4 of 5 Stars
Thanks for good support and help with setting up this converter. Being new to this type of products ...

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Date Added: 05/21/2010 by Jason Hill
5 of 5 Stars5 of 5 Stars
works great, reasonable price, recommended

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Date Added: 02/26/2010 by Erika LeBlanc
4 of 5 Stars4 of 5 Stars
Before purchasing from USconverters to go I purchased cheap adapters from two other suppliers, but I...

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Date Added: 01/04/2010 by Aaron Phillips
4 of 5 Stars4 of 5 Stars
works great, easy to use

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Date Added: 01/02/2010 by Mark McHuchins
5 of 5 Stars5 of 5 Stars
We are using these with our dataloggers to log water height in our tanks. Works fine, and very conve...

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Date Added: 12/26/2009 by John Hansson
5 of 5 Stars5 of 5 Stars
Works perfectly. Great service and products.

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