Saffire 56 mix control with PT10

Recently updated to the latest version of mix control, and have seemingly forgot how to properly route my signal to be monitored. I'd like to send out of pro tools via spdif to my digital board, where I have my monitor path set up. I'm needing help with how to get signal from pro tools out to the mix control software, where no signal is showing up. Is it an I/O setup thing? A mix control thing? Any help would be appreciated!