RS232 Baud Rate Converter

Got two RS232 devices that won't talk ?

The RS232 Baud Rate Converter is a device which can sit in-line with an RS232 cable and change the speed or baud rate of the data passing through.

It has a 7 kilobyte buffer so a fast device can send a fair bit of data to a slow device before you run out of buffer.

Equipment which may need this:

  • Laboratory equipment
  • Data logging devices
  • GPS units
  • Bar code scanners and POS equipment
  • Home Automation systems

Configuration is done by a PC running a simple serial terminal such as HyperTerminal. It can be configured from Windows, Mac, Linux and any other device which can function as a serial terminal.


  • Works at most speeds from 11bps up to 120,000bps.
    Click here to see if it supports the rate you want.
  • 7kB memory buffer in each direction.
  • Is has a female DB9 socket on one side and a male DB9 plug on the other so it acts as a pass-through.
  • Easily configured from a PC via the serial port.
  • Programmable time delay
  • Fully compliant with RS232 voltage levels.

Note that it does not support hardware handshaking or XON/XOFF flow control.

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10/14/2013 Back in Stock

I was a little stuck for stock over July but I now have dozens of shiny new Bit Rate Converters. The new revision of the board has reverse-polarity protection so you cannot damage anything if the power is plugged in backwards. They are also robot-assembled in China. I was hand-building units for a while to […]

08/01/2013 Crispy fried chips

I got an RS232 bit rate converter in for repair today. Tests indicated that it boots up fine but converts data in one direction only. Also the indicator lights do not light. I opened up the case and ho-lee-cow! Looks like some hell of a voltage surge happened here. Maybe it got hit by lightning. […]

06/20/2012 More design refinements to the Baud Rate Converter

The latest batch of RS232 Bit Rate Converters have a few improvements over the previous releases. The new model is called RS004. I’ve actually been selling these for a few months now so anyone who ordered some recently already has these new features: Programmable time-delay in each direction so you can delay your packets. Support […]

08/15/2010 Ready to Go

Hooray, the next batch of boards has arrived after after a bit of an adventure – FedEx delivered them late and to the wrong address! Fortunately it was a nice old lady down the street who received the boards and she brought them over to me. I now have stock. All you people holding off […]

08/05/2010 Sold!

Remember those new boards I got yesterday? Well, they all sold today. Bam! just like that! So I guess I’m still out of stock until the next batch arrives

08/04/2010 First boards in from China

A sample batch of boards have arrived today. Hooray! They all work. Hooray! Overall I am happy with the boards and as an added bonus they are now RoHS compliant and look a lot neater than the hand-soldered ones. There were a few downsides with the process though, the main one being the length of […]

06/21/2010 Adventures in Outsourcing

I’m currently attempting to get a batch of RS232 Rate Converters made in China, I’ve been getting the PCBs etched in China for months now so this is the logical next step. The biggest problem so far has been sourcing the parts. I’m getting most of the stuff from DigiKey because they specialize in smaller […]

02/22/2010 Overkill or Foresight?

The Serial Bit Rate Converter runs an ARM7 CPU which is complete overkill for the simple job of relaying serial data. I’ve often thought I should redesign it to run a cheaper and less powerful CPU like a PIC or AVR. I originally designed it with an ARM7 simply because I like them and enjoy […]

01/21/2010 First Production Volume Box

Finally I have all the parts and I spent last night assembling ten boxes to fill my first order. It looks not half bad. Next I need to set up a web page and finalize pricing so anyone can buy one. So what is a Volume Box I hear you ask? Well, the Volume Box […]

01/09/2010 Volume Box is Almost There

I’m getting orders for the Volume Box already. I haven’t even put up a web page for it. But wouldn’t you know it, the plastic case I want is not in stock with any of my regular suppliers (at least, those ones who are not still on extended Christmas holiday) so I’m having to get […]