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Functional Description
In order to perform a RS-485 two wire loopback in AUTO mode, you need to have two separate ports to communicate between. In this example, the two wire AUTO mode is programmatically set on both ports. The important part is the connection made between the two ports. Make sure to tie pins 4 and 8 (RXD+ and TXD+) together then wire this connection to pins 5 and 9 (RXD- and TXD-), which should also be tied together. This is refelected in the next two images.
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I know there is another RS-485 auto mode VI on this community, but I was unable to get it to work without using two separate ports, which that examples does not include. I have tested this, and it worked for me.
Cheers!