Now I remember that actually our FD is setup is just like this:
using a single USB-serial converter with RX/TX controlling the rig via hamlib
and DTR doing keying via cwdaemon. We had no issues with it. 
The only thing is that at Tlf start-up the key is down for a second.
I'll check hamlib config to see if this behaviour can be cured.
Thanks Nate for the pointer.

73,
Zoli

On Fri, Nov 29, 2019 at 12:51:59PM -0600, Nate Bargmann wrote:
> That's cool, Olaf.
> 
> It stands to reason that the DTR and RTS lines would explicitly need to
> be turned off as I think the kernel automatically enables them when an
> application initializes the port.
> 

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