Using TDM mode on iMac

Hey! I recently upgraded my iMac, however I want to use my old iMac as a secondary moniter. I purchased the thunderbolt cable, and enabled TDM mode however once I sleep my iMac it disables TDM mode. Is there a way to keep TDM on always even when sleeping my iMacs, rather then having to Command-F2 every single time I boot up?

Hi, as far as I know, you cannot sleep it.

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