[aprssig] has anyone built/modified a USB to TTL level converter??

John Hansen john at coastalchip.com
Thu Jun 2 11:15:39 EDT 2011

When I wrote the text below, I didn't realize Jason was also making these
modules.  If I were you, I'd probably order Jason's... you're likely to get
much better customer service.

John W2FS

On Thu, Jun 2, 2011 at 11:12 AM, John Hansen <john at coastalchip.com> wrote:

> Actually most of those USB to RS232 device are really USB to TTL and then
> TTL to RS232, so what you really need is half of one of them.  The chip in
> most of them is the venerable FT232RL from FTDI, which is actually a USB to
> TTL chip.  If you are willing to design a circuit board for it and solder a
> very fine pitch IC on it, you can do this very cheaply.  If you are looking
> for more of a "one off" design and don't want to do surface mount soldering,
> there are several modules that will do this for you.  One of them is here:
> http://www.mouser.com/ProductDetail/FTDI/MM232R/?qs=sGAEpiMZZMuDw7xUFNwm7FLM102iGmY8g7HVF99Lsbg%3d
> John W2FS
> On Thu, Jun 2, 2011 at 10:58 AM, Bob <k8ys at fuse.net> wrote:
>> I need TTL.
>> I have RS232
>> I have USB
>> I do not have a RS232 port. Rules out the standard USB to RS232 dongle.
>> I think that I want to take an old cell phone to computer interface that
>> has
>> a USB to RS232 level converter. It is a common chip, and I have the
>> drivers.
>> I want to take the RS232 from the cell phone cable and feed it to a MAX233
>> to get TTL in/out.
>> Then use the TTL to talk to the IC706m2g to control the radio.
>> Without reinventing the wheel, is there a "better way"?
>> Bob K8YS
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>> aprssig at tapr.org
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