I've had similar problems with my 380s, 36 and 37. It takes me a few tries of plugging in and unplugging the connectors and powering up. I have not been able to find the logic in what sequence works. I diligently took notes one time after a power outage, and once I got it running I tried that sequence again--it didn't work. I have not been able to find anything in the manuals about powering up to get the communications to work properly, the manuals almost imply that it's a completely automated procedure. Have you by any chance contacted Madrigal? I would be interested in knowing what they had to say.
