Zebra LP2844 stopped responding to ZPL Commands or Files

You have to print EPL code to a LP2844 printer. It does not respond to ZPL code.

My recent research seems to indicate the the LP-2844 and TLP-2844 are EPL only and the LP-2844Z and TLP-2844Z support ZPL. The non-Z versions, which were originally called the Eltron LP-2844, also have very little RAM.