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ray18

ok, many thanks for the elaboration. Much of this is beyond my brain.
(1) wow, we can view the devices output of NMEA 2000 raw data and save the log onto sd card! Essentially a NMEA2000 device and data scanner and logger. Many thanks for the excellent function. - I learned something today.
(2) bummer, with my 2019 Yamaha 70 hp F70 pigtailed to CL multi-hub and Yamaha gateway 6YG-8A2D0-00-00 connected to multi-hib and NMEA2000 backbone and Axiom 9". I use the Axiom network function to diagnose using LH 3.1142, but I didn't see my F70 shown in the device scan, so no NMEA 2000 is streaming into Axiom 9 ". I just remembered my starting battery ran low in my last fishing trip because I had it to share with my 24 volts trolling motor.Could a dying battery cause my F70 motor ECM to stop sending data to gateway? I think I may need a ECM reset like what we do for cars using OBD II reset tool. If yes, is there a cheap solution to reset the Yamaha 70 hp ECM other than taking it to the dealer?
(3) isn't LH 3.11.42 essentially a NMEA 2000 analyzer? Why do I still need to get a NMEA 2000 analyzer?

Many thanks for your help to troubleshoot my stop displaying engine data problem?