Select your product to confirm this information applies to you
Interfacing a Garmin Portable to an SL Series Radio
Garmin® aviation portable devices can be interfaced to the SL30 or SL40 for remote frequency loading by using the appropriate bare wires cable. Each Garmin aviation portable device has an optional accessory available for it that will allow your avionics installer to interface it with the SL30 or SL40. Additionally, the Interface setting on the Garmin portable should be set to VHF Out. More information on the Garmin portable settings can be found in the appropriate Pilot’s Guide.
More information about the SL30 and SL40 can be found below: