It sounds like you're asking about the compatibility of a "cat 2WS ELOG," but this phrase immediately doesn't match up with a widely recognized product or technology. I'm not sure if there's some typo or if you may be referring to something a bit specific.
Here are a couple of possibilities that I can think of
Cat 2WS
If you mean with a "CAT" means Caterpillar 2WS, then it would fall under machinery or a model in the line of vehicles, the "2WS" standing for the number series or model. "ELOG" would apparently refer to an electronic log used in transportation or in heavy equipment for monitoring its hours of operation or recordkeeping for regulatory purposes.
ELOG
If by "ELOG" is meant an Electronic Logging Device-a gadget usually mounted on trucks or other machinery to record hours put in by the engine or the machine-on, then the question probably is something like whether a particular Caterpillar machine, maybe a "2WS" model, is compatible with such a device.
In which particular context or product are you asking about? The more information, the better answer I can provide!