qtalk and rz (zmodem)

Hi

I need to be able to download files from a windows machine (using
hyperterminal) to a RTP box over a serial link.

I’ve got a version of rz (I need to use zmodem as its what the customer
requires).

I’m getting qtalk to invoke rz but I always get ‘read : resource temporarily
unavailable’

If I call rz directly - it just sits there and never appears to read
anything.

Any clues? I need to get this going asap…

Jim