Please note the Mac OS version of the Manager is discontinued since November 2018, Your instrument can still work on a PC.

If your Mac OS is unable to locate devices on your USB ports 
This is not caused by the Manager itself as the application uses whatever USB information
 is presented to it via the Mac OS.

Please consult the link below for instruction on how to resolve USB ports problem on Mac OS
Provided by

Mac USB Ports Stopped Working? It’s Likely Easy to Fix

Relates error messages 

Catalina OS. We can not find device
USB device not found on Mac 
Mac OS , can't find USB device  

We can not find device. Please connect a Trip Logger.    

Nous trouve pas d’appareil

Périphérique USB introuvable sur Mac

Mac OS, impossible de trouver le périphérique USB

Nous ne pouvons pas trouver l’appareil. S’il vous plaît connecter un enregistreur