I am using BrightSign HD1023 and would like to integrate it with Arduino Mega 2560 by sending commend to BrightSign for video control. However, it did't work. I found that there is a field under "File > Presentation Properties > Interactive" to set baudrate and port number of serial communication, but anything i set can not be saved and remain to the default setting (Port 0 and Baudrate 115200).
Any ideas? thx