Re: [Gumstix-users] RS-232 comms is flakey

[David F. <dav...@ya...>]

Kim, I use the 3233 on a board also.  The guaranteed spec I think is 3.6V, the
absolute maximum is 4V but I wouldn't operate there. What are you doing with
forceon?
David.

Kim Hendrikse <ki...@ki...> wrote:
> Kim, are you using a waysmall? If not what RS232 chip are you powering by
> battery?
> David.

I'm not using the waysmall. I'm using a MAX3233 chip.

- Kim

> Kim Hendrikse wrote:
> I've made some progress on my flakey rs-232 problem. In my case, my gumstix
> worked fine in one harness, but my new one had the problems. The pressure
> connector looked fine and there were no shorts in it. I've made a new
> harness with a really short cable to it and now it works fine. The
> other one had about 20cm of cable and another board inbetween to rearrange
> the connections (Because of a mistake). Apparently that's too much length
> for the raw uart signals. I'm running the new one off 3.7V directly
> from the battery. It also provides access to the jtag pins so later on I
> should be able to see whether my home built jtag cable works or not.
> 
> - Kim
> 
> 
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