On Mon, 08 Jan 2018 17:42:25 +0000, bob prohaska wrote:

> I'm stumped on what to try next.
>
A different make of USB-serial converter?

Some of these have always been garbage. I had good results quite a while
back from a pfranc device, but that website has since vanished.

I'm currently using the one supplied by PICAXE,

http://www.picaxe.com

which successfully connects to a PICAXE chip on one of their experimental
PCBs from a Lenovo laptop or my RPi. This is their AXE 027 cable,

http://www.picaxe.com/AXE027

which is terminated at the PICAXE end with a stereo, i.e. three contact,
3.5mm jack. They also sell matching 3.5mm plastic sockets with pins
positioned to fit a 0.1" grid breadboard.

This connection is running at 4800baud, using 8 bit characters with no
parity and 1 stop bit.

I've not done a lot with it yet, except to upload compiled programs into
the PICAXE and display messages returned to the RPi by test programs
running on the PICAXE, but I think that much is enough to show that the
cable was providing a solid connection to both computers.


--
Martin    | martin at
Gregorie  | gregorie
          | dot org

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