The MAX232 method is likely gonna be picky as heck unless there's a constant power source available. You can use the DTR line on the serial port but on some systems this isn't driven with enough current.

That being said, this is what I've used.

I just tossed a 2N2222 and 2N3904 in there as the PNP and NPN transistors. Never fails.

http://www.kc8unj.com/opc478.gif

On Mon, Nov 2, 2015 at 8:53 AM, Steve Whitehead <nv7vham@gmail.com> wrote:

Turns out it looks like most of the CP2102 USB adapters are 3.3V output.  Specifications for

TTL logic is 5V.  I have ordered a CP2102 that has both so we'll try that and see what

happens.

In the dim times (when we used a kerosene lamp to illuminate our computer screens) a common

practice was to use a Max232 to convert RS232 levels to TTL for programming radios when you did

not want to purchase a $40 cable from RT systems.  It was often hit and miss if the radio would work

because the levels were sometimes not quite right.....

Should have the different CP2102 this week and report back.

>Thanks for the response Jim.  I wish it as easy as finding a short.
> I have three of the converted 6-in-1 cables and the behavior is the same.
>I will keep playing with it.  I did not order the cheapest available CP2102
>available from China and notice there are several different styles.
>Perhaps this one is somehow different in levels or buffering from the
>others.  I have read online others have had success programming the
>FT-60 with the CP2102 so something is different.  One thing of note is
>this is one of the CP2102s that John said has the TXD and RXD switched.

>On Fri, Oct 30, 2015 at 8:25 AM, Steve Whitehead <nv7vham@gmail.com> wrote:
>
> I have been using one of the 6-in-1 programming cables with the
counterfeit
> Prolific chip in it.  After reading John Miklor's article about using the
> CP2102
> in place of the Prolific counterfeit I replace the chip with the CP2102.
>
> The cable works perfectly with the UV-5R radios but no longer works with
the
> Yaesu FT-60.  It is the same with my MacBook Pro or if I use FT-60
> commander.
> I thought before I start spending several hours chasing this down I would
> ask
> if anyone else has run into this.
>
> Thanks,

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Please note new e-mail address

nv7vham@gmail.com

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Tom Morris, KG4CYX

Exhibit Technician and Plastic Orange Tree Arborist, Miami Children's Museum

786-228-7087

151.820 Megacycles