I have Fez Cobra board connected to Telit GM862-QUAD through COM3 on Cobra(but whatever I use, behavior is same), and beside other, I have communication problem in runtime.
While Cobra is connected to debugger, I have serial communication between devices. But when start application in runtime, it is not communicating with gm862. I log data, and seems that I send data to module, but it is not respond.
I tried to wire both, 3.3 and 5v fez outputs to VCC_BRD on GM862, but same results.
So, in debug, everything works fine, but after restart, it stops.
I use this board for Telit: http://www.mikroe.com/eng/products/view/468/smartgm862-board/