I tried some times ago to make sony ericsson worksing, but without success. model tested is a T250i.
Could you please tell me if I can use your posts for my case.
We do not normally support the use of non-PC RS232 connections to current Motorola handsets. The only serial connection supported is serial-over-USB, where the handset is connected to a USB port on a PC, and the PC operating system assigns a virtual COM port to the USB connection for this purpose. Microsoft Windows is normally needed to meet this requirement.
Communication (USB/RS232)Along with the standard USB communication between a phone and a host, another UART based protocol will also be supported. This protocol will allow a phone to communicate with a CEA-936 compliant device without the expense of requiring it to be a USB Host.
Pin 3D-Used for device identification.Acts as D- for USB mode,UART TXD in UART modeSPKR_OUT in audio modeSPKR_L in stereo mode