External Data Source - Garmin MX20 Installation Manual

Installation

2.7.2 External Data Source

This menu allows the software to assign ports to the installed sensors.
1. Press the DATA smart key while still in the INSTL function.
2. Ensure the External Data Sources pages of the MX20 have the desired configuration. Modifications
can be made using the line select keys. Port allocations must match how the system is wired. Set
port source to None if the hardware is not installed. The Internal GPS Position Source, when
present, must always be configured to Port 3. If the altitude data is supplied from the GX model or
CNX-series unit (or GNS 480), the Altitude Source port must be set to the same port number that
the GX model or CNX-series (or GNS 480) unit is connected to (such as Port 1 in the example
shown below). When the MX20 is connected to a CNX-series (or GNS 480) navigator with an
internal NAV receiver, the NAV Data Source on the MX20 must be set to NONE.
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