On Sun, 03 Jun 2018 07:44:20 +0000, Jan Panteltje wrote:

> On a sunny day (Sun, 03 Jun 2018 07:07:24 GMT) it happened Jan Panteltje
>  wrote in
> :
>
>>The real RS232 RXD from the D connector comes in on pin 13,
>>and goes to your 3.5mm connector's rx.
>
> Should read:
> and goes from pin 12 to your 3.5mm connector's rx.

I don't have that many pins :-)

Made up a cable: D9-> 3.5 stereo jack cable with handshake jumpers (7-8,
1-4-6) today and tested it on my old pFranc USB->RS232 adapter using my
termination/test box to monitor signal levels. It worked as expected when
driven by ptlrc on both RPi and Lenovo T440 (Fedora 27) hosts. My 'scope
showed a good solid 12v signal when it was on the RPi. Ran out of time
then (other engagements), so will try it on the KRT2 radio tomorrow.


--
Martin    | martin at
Gregorie  | gregorie dot org

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