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Accessing a UART on developer board

> Hi!
> I am using my com1 and com2 and would like another serial interface for
> communication with a Bluetooth module. Since my BT module can communicate
> with UART (i prefer not to use USB) it would be great if I could access
> another UART on the developer board, which does not disable the com1, com2
> functionality.
> Does anyone know how this can be done? Can I get the UART from the PCB
> before the RS-485 trancievers (ser3?)? What software modifications are
> then required?
> /Johan