BL1800 communication error

hi,
im having problems with the bl1800 lead free serie
before i never had any probs or errors, but now …
even when i merly connect the power and try to download a sample program i get this error : while sending pilot Bios communication error.
i have tried to change the baudrate but i still get the same result
i have no idea what i am doing wrong
does anybody have the same experience or could somebody help me?
please it urgent
grz muk

I had the same problem. Luckily I had several units. When I changed to another unit, there was no communication error anymore.