I've now encountered the same problem with i386 Linux and ARM9 Linux 
using SynaSer and FreePascal.  Thought I'd leave a message here before I 
spend more time looking into this.

Normal (real) serial ports work fine but when using USB to serial 
adapters the program crashes upon connect unless I comment out these two 
lines:

procedure TBlockSerial.Connect(comport: string);
...
   RTS := True;
   DTR := True;

With those lines commented out things work but my program crashes if I 
try to set RTS somewhere in my code.

I've encountered the same problem using two different adapters.  The 
adapters have FTDI and MOSCHIP chipsets and both automatically detected 
and installed in Linux.

I need to manually control the RTS line to key a radio so I need to 
solve this problem soon.

The MOSCHIP adapter gets wrong receive data on ARM9 Linux but that is 
another problem.  My connected radio needs 1200 baud and right now I 
suspect the baud rate is not being correctly set.

Thanks in advance for any suggestions.

-- 
Regards,
Paul Breneman
www.BrenemanLabs.com
www.TurboControl.com/TPSupport.htm - TurboPower support links

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