[RTTY] What Adapters do the Rigblaster People Use?

[Eric - VE3GSI]

Gang,
I am helping a fellow Ham set-up on RTTY using a USB adapter from with his 
Rigblaster Nomic.  Yes I know the Nomic is a AFSK interface. As an 
experiment, he is using an external keying transistor between this adapter 
and the RTTY circuit of his Kenwood rig. It keys the rig, but only sends 
garbage for RTTY.

He just told me the Rigblaster USB to serial adapter uses a Prolific chip 
set. <ugh>. How does the Rigblaster PLUS work on RTTY using this USB 
adapter? Or do the Rigblaster people provide a different USB adapter for the 
Rigblaster Plus?

All info welcome.

Thanks,
Eric - VE3GSI.