On Saturday, January 14, 2017 at 3:57:04 AM UTC-5, Eelco F wrote:
>
>  I use a simple mini-itx board, with a regular com1 port, so no converter 
> is used.
>

check your wiring.  it looks like rx on the computer is ok, but tx is not.

i could add write timeouts to the ultimeter driver, but that would probably 
just tell us that the writes are not getting through to the device.

m

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