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Post: Sorry for the delay. I have managed to get a Raspberry Pi 3 running Windows IoT to work with the RS485 Pi. I set up a fresh image of IoT and used a modified version of the SerialUART demo from Microsoft so I could send a receive data over the UART port. I have uploaded the modified version to our [url=https://github.com/abelectronicsuk/testscripts/blob/master/SerialUART.zip]GitHub testscripts folder[/url] so you can try it on your Raspberry Pi. I basically stripped out all of the code which allows you to select a UART port in the GUI and hard-coded it to work on the Raspberry Pi UART port with a baud rate of 115200. The RS485 Pi was connected to another RS485 Pi on a Raspberry Pi 2 running Linux which is configured to use the UART port as a terminal. When I started the SerialUART app and then powered up the second Raspberry Pi I received the normal Linux bootup text in the received data box on the Windows app and once booted I could send data to the second Raspberry Pi from the app and have it echo the text back so two-way communication appears to be working. Can you try downloading the modified SerialUART app and see if it works on your Raspberry Pi? It may be worth double-checking your wiring as well just to make sure everything is connected correctly.