www.dl2rum.de

Where can I finde more information about this interface?

RTS is required. The state of DTR and/or DCD doesn't make any difference. I installed another Mac logging program, and it works.

It seems like the freq and mode is being stacked somewhere, and clicking the Reset CAT button pops it off the stack.

Phil has been making these for a loooong time. http://www.hosenose.com/PDA_Interface_Guide.aspx Google has lots of hits.