Question about "Hardy Heron" with Orca and Braille

[Demetry]

Hi community,

I downloaded the "Hardy Heron" Desktop CD for AMD 64.
A few time later after the jungle sound I started the Orca and the Orca 
preferences. In the sub-dialog Braille there's the braille support 
enabled. But I can only hear the voice and my braille display will not 
start. I don't know why that really.
In the run dialog the command BRLTTY works not. What can I do?
And my other question is how I work right with Orca?

Thanks in advance.
Demetry