Hi Mike,
You are absolutely right, of course these are not TTL,
I'm confused little bit. :(
Thanks
Csaba

>RTS or DTR are NOT TTL level signals.  You will have to pass them through a
>level translator (such as a 1489 or the RX half of a MAX232) to get TTL/CMOS
>level outputs.  From here, the signals can be used to control a relay driver
>(such as a ULN2003A).
>
>myke