Sorry about the delays. I had missed the last notification on this thread as it seems.
I also miss understood your initial request. This forum section is about AAF content. Your request seems more related to an ACEmanager question.
AAF is a development framework enabling to extend the capabilities of the devices to program your own logic. It might satisfy your current requirement but you would need to develop an application.
You can find AAF Getting Started tutorials in the the source (source.sierrawireless.com). There is a sample application demo-ing the use of the serial port.
If you want to really stay with ACEmanager configuration, I would recommend to contact your local Sierra representative directly, in order to get proper support.