So far I can see here http://www.datamax.co.nz/pdf/dmx_prog-v11.pdf the Datamax printer language is quite differs from languages that are supported in Zebra printers. And your new Zebra ZE500 printers has no support for Datamax language. So it looks like you will need to write a new code in ZPL for these print engines.
Here you can find a ZPL and ZBI programming manual:
Software Engineer, Kutir Mobility
Posted on behalf of Zebra Technologies