Garmin 620 sonar alarm

[HENRYTONDOLO]

I have a robalo boat r220 whit yamaha f250 equipped whit command link and triducer, how can i run the sonar alarm of my garmin 620?

[boats.net]

You would to install the NMEA 2000 Gateway(MAR-GTWAY-ML-09) if the Garmin 620 is NMEA 2000 compatable.
Here is more information on Gateway,
O2009_014.pdf