Does anyone know if it is safe to connect a MinnKota Ulterra MDI built in transducer to a Helix 9 G3N MEGA+ SI unit? The Helix 9 SI unit will be sending SI signals to the transducer, but it is only a DI transducer, so will the Helix be damaged if there is no connection for the SI signals? I thought I saw a previous post about someone damaging their unit by doing this, but I wanted to verify. Thanks.