When connecting TallyMan to a K-frame, a common reason for not being able to connect is not having stated the TallyMan's IP address in the "Tally Contribution" pane of the K-Frame's UI.
Below is a link containing a step by step guide to get you connected to a Grass Valley K-Frame switcher:
Connecting TallyMan to a Grass valley K-Frame
For additional information regarding Switcher setup within TallyMan, please take a look at the document linked below: