Time Code

I'm trying to figure out how to send timecode to all my devices. I have 3 P2 cameras and a Mac Pro running ProTools. I'm switching my P2 cameras on an ATEM 1 M/E production switcher. I also have an Apogee Big Ben Master Digital Clock syncing all of my devices but we have no way to send timecode to our devices. Every now and then we slave each camera to record to P2 cards but in post we have no way to sync them by time code. If anybody can help me that be awesome.