Hello ibrahim!
It is mainly a question of processing power. With an OSx-32 at 2048x10, you will likely be able to hook up to 3 or possibly 4 LiDARs to one XM (it depends on what else is going on in the application). If you lower the data rate, you will be able to hook up more. However, using an OSx-64 at 2048x10 has twice as much information, and therefore, the XM can only support half as many lidars. There are a few knobs to tailor to what you need!
