generating a repeating (Digital) sequence in simulink

Hello All,

I need to generate a digital signal that repeats (signal is based on an RS232 signal), I have tried using the "Repeating Sequence" block but this introduces a slew on the signal between transitions, and when combined with a delay block the edge does straighten up but there is a time overhead when making the signal.

The signal generator does not repeat afaik?

Is there an easier method of creating a repeating sequence for a digital signal?

Many thanks,

Dave