Other than a couple of minutes of success when running in simulator mode, I have been unable to get my 740B to work with my Dynon10A. I have not asked Dynon if they would go for it, but if someone near Woodinville WA could take their unit, and a serial to US cable, to Dynon and try it. I don't mind sending mine, but someone on-site that knows how to operate the 740B would be great.
Regards,
Charlie