What do I need to do to get the RS-232 output to work on the PE-HMI kit?
To use RS232 on the PE-HMI board, the user has to enable the transceiver output with the RS_DEN signal, active high on port PB6. SCI 5 is already enabled per default in the standard BSP for the HMI board. However PB6 is erroneously pre-selected in the BSP as the ETH WOL pin, which is not used as such on the board. This pin needs to be changed to a standard GPIO in order for the RS_DEN signal to be available.